miun.sePublications
Change search
Refine search result
1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Almeida, Tiago P.
    et al.
    PIPG Bioenergia-UNICAMP, Campinas, SP, Brazil.
    Miyazaki, Celina M
    Centro de Ciências e Tecnologias para a Sustentabilidade- UFSCa, Sorocaba, SP, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Silva, Tatiana A.
    University of Campinas (UNICAMP), SP, Brazil .
    Braunger, Maria Luisa
    University of Campinas (UNICAMP), SP, Brazil .
    Barros, Anerise
    University of Campinas (UNICAMP), SP, Brazil .
    Hollmann, Frank
    Delft University of Technology, Delft, The Netherlands.
    Riul Jr, Antonio
    PIPG Bioenergia-UNICAMP, Campinas, SP, Brazil.
    Ultra-Thin Films of Reduced Graphene Oxide (RGO) Nanoplatelets Functionalized with Different Organic Materials2016In: Journal of Bioprocessing & Biotechniques, ISSN 2155-9821, Vol. 6, no 3, article id 1000272Article in journal (Refereed)
    Abstract [en]

    This work aims the functionalization of reduced graphene oxide nanoplatelets with chitosan (G-chitosan) and also with poly(styrenesulfonic acid) (GPSS), thus forming stable, dispersed aqueous solutions. G-chitosan and GPSS solutions allowed the layer-by-layer (LbL) film formation with glucose oxidase (GOx), establishing multilayered nanostructures with elevated control in thickness and morphology. The graphene nanoplatelets were characterized by UV-vis and FTIR spectroscopies, resulting in good adherence and linear deposition of the graphene nanoplatelets with GOx in the LbL structures.Cyclic voltammetry shows an enlargement in the current intensity with increasing number of deposited LbL layers, possibly owing to the formation of conducting paths by the graphene nanoplatelets in the tailored multilayer nanomaterial formed

  • 2.
    Barbosa, Simone C.
    et al.
    Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
    Nobre, Thatyane M.
    Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Ciancaglini, Pietro
    Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
    Cilli, Eduardo M.
    Instituto de Química, Universidade Estadual Paulista, Araraquara, SP, Brazil.
    Lorenzon, Esteban N.
    Departamento de Bioquímica e Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Brazil.
    Oliveira Jr., Osvaldo N.
    Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
    The Importance of Cyclic Structure for Labaditin on Its Antimicrobial Activity Against Staphylococcus aureus2016In: Colloids and Surfaces B: Biointerfaces, ISSN 0927-7765, E-ISSN 1873-4367, Vol. 148, p. 453-459Article in journal (Refereed)
    Abstract [en]

    Antimicrobial resistance has reached alarming levels in many countries, thus leading to a search for new classes of antibiotics, such as antimicrobial peptides whose activity is exerted by interacting specifically with the microorganism membrane. In this study, we investigate the molecular-level mechanism of action for Labaditin (Lo), a 10-amino acid residue cyclic peptide from Jatropha multifida with known bactericidal activity againstStreptococcus mutans. We show that Lo is also effective against Staphylococcus aureus(S. aureus) but this does not apply to its linear analogue (L1). Using polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS), we observed with that the secondary structure of Lo was preserved upon interacting with Langmuir monolayers from a phospholipid mixture mimicking S. aureus membrane, in contrast to L1. This structure preservation for the rigid, cyclic Lo is key for the self-assembly of peptide nanotubes that induce pore formation in large unilamellar vesicles (LUVs), according to permeability assays and dynamic light scattering measurements. In summary, the comparison between Labaditin (Lo) and its linear analogue L1 allowed us to infer that the bactericidal activity of Lo is more related to its interaction with the membrane. It does not require specific metabolic targets, which makes cyclic peptides promising for antibiotics without bacteria resistance.

  • 3.
    Graça, Juliana Santos
    et al.
    Federal University of São Carlos, Center for Sciences and Technology for Sustainability, Sorocaba, SP, Brazil.
    Miyazaki, Celina Massumi
    Federal University of São Carlos, Center for Sciences and Technology for Sustainability, Sorocaba, SP, Brazil.
    Shimizu, Flavio M.
    University of São Paulo, São Carlos, SP, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Mejía-Salazar, J. R.
    University of São Paulo, São Carlos, SP, Brazil.
    Oliveira Jr, Osvaldo N.
    University of São Paulo, São Carlos, SP, Brazil.
    Ferreira, Marystela
    Federal University of São Carlos, Center for Sciences and Technology for Sustainability, Sorocaba, SP, Brazil.
    On the importance of controlling film architecture in detecting prostate specific antigen2018In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 434, p. 1175-1182Article in journal (Refereed)
    Abstract [en]

    Immunosensors made with nanostructured films are promising for detecting cancer biomarkers, even at early stages of the disease, but this requires control of film architecture to preserve the biological activity of immobilized antibodies. In this study, we used electrochemical impedance spectroscopy (EIS) to detect Prostate Specific Antigen (PSA) with immunosensors produced with layer-by-layer (LbL) films containing anti-PSA antibodies in two distinct film architectures. The antibodies were either adsorbed from solutions in which they were free, or from solutions where they were incorporated into liposomes of dipalmitoyl phosphatidyl glycerol (DPPG). Incorporation into DPPG liposomes was confirmed with surface plasmon resonance experiments, while the importance of electrostatic interactions on the electrical response was highlighted using the Finite Difference Time-Domain Method (FDTD). The sensitivity of both architectures was sufficient to detect the threshold value to diagnose prostate cancer (ca. 4 ng mL−1). In contrast to expectation, the sensor with the antibodies incorporated into DPPG liposomes had lower sensitivity, though the range of concentrations amenable to detection increased, according to the fitting of the EIS data using the Langmuir-Freundlich adsorption model. The performance of the two film architectures was compared qualitatively by plotting the data with a multidimensional projection technique, which constitutes a generic approach for optimizing immunosensors and other types of sensors. 

  • 4.
    Massey, M. K.
    et al.
    Durham University, United Kingdom.
    Kotsialos, A.
    Durham University, United Kingdom.
    Qaiser, F.
    Durham University, United Kingdom.
    Zeze, D. A.
    Durham University, United Kingdom.
    Pearson, C.
    Durham University, United Kingdom.
    Volpati, Diogo
    University of São Paulo-USP, Brazil; Durham University, United Kingdom.
    Bowen, L.
    Durham University, United Kingdom.
    Pettyl, M. C.
    Durham University, United Kingdom.
    Computing with carbon nanotubes: Optimization of threshold logic gates using disordered nanotube/polymer composites2015In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 13, article id 134903Article in journal (Refereed)
    Abstract [en]

    This paper explores the use of single-walled carbon nanotube (SWCNT)/poly(butyl methacrylate) composites as a material for use in unconventional computing. The mechanical and electrical properties of the materials are investigated. The resulting data reveal a correlation between the SWCNT concentration/viscosity/conductivity and the computational capability of the composite. The viscosity increases significantly with the addition of SWCNTs to the polymer, mechanically reinforcing the host material and changing the electrical properties of the composite. The electrical conduction is found to depend strongly on the nanotube concentration; Poole-Frenkel conduction appears to dominate the conductivity at very low concentrations (0.11% by weight). The viscosity and conductivity both show a threshold point around 1% SWCNT concentration; this value is shown to be related to the computational performance of the material. A simple optimization of threshold logic gates shows that satisfactory computation is only achieved above a SWCNT concentration of 1%. In addition, there is some evidence that further above this threshold the computational efficiency begins to decrease. (C) 2015 AIP Publishing LLC.

  • 5.
    Massey, M.K.
    et al.
    Durham University, UK.
    Kotsialos, A
    Durham University, UK.
    Volpati, Diogo
    University of São Paulo, Brazil.
    Vissol-Gaudin, E
    Durham University, UK.
    Pearson, C
    Durham University, UK.
    Bowen, L
    Durham University, UK.
    Obara, B
    Durham University, UK.
    Zeze, D.A.
    Durham University, UK.
    Groves, C
    Durham University, UK.
    Petty, M.C.
    Durham University, UK.
    Evolution of Electronic Circuits using Carbon Nanotube Composites2016In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, no 32197Article in journal (Refereed)
    Abstract [en]

    volution-in-materio concerns the computer controlled manipulation of material systems using external stimuli to train or evolve the material to perform a useful function. In this paper we demonstrate the evolution of a disordered composite material, using voltages as the external stimuli, into a form where a simple computational problem can be solved. The material consists of single-walled carbon nanotubes suspended in liquid crystal; the nanotubes act as a conductive network, with the liquid crystal providing a host medium to allow the conductive network to reorganise when voltages are applied. We show that the application of electric fields under computer control results in a significant change in the material morphology, favouring the solution to a classification task.

  • 6.
    Pavinatto, Adriana
    et al.
    University of São Paulo, Brazil.
    Delezuk, Jorge A.M.
    University of São Paulo, Brazil.
    Souza, Adriano L.
    University of São Paulo, Brazil.
    Pavinatto, Felippe J.
    University of São Paulo, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. São Carlos Institute of Physics, University of São Paulo, USP, P.O. Box 369, São Carlos, SP, Brazil .
    Miranda, Paulo B.
    University of São Paulo, Brazil.
    Campana-Filho, Sérgio P.
    University of São Paulo, Brazil.
    Oliveira Jr., Osvaldo N.
    University of São Paulo, Brazil.
    Experimental evidence for the mode of action based on electrostatic and hydrophobic forces to explain interaction between chitosans and phospholipid Langmuir monolayers2016In: Colloids and Surfaces B: Biointerfaces, ISSN 0927-7765, E-ISSN 1873-4367, Vol. 145, p. 201-207Article in journal (Refereed)
    Abstract [en]

    The interaction between chitosans and Langmuir monolayers mimicking cell membranes has been explained with an empirical scheme based on electrostatic and hydrophobic forces, but so far this has been tested only for dimyristoyl phosphatidic acid (DMPA). In this paper, we show that the mode of action in such a scheme is also valid for dipalmitoyl phosphatidyl choline (DPPC) and dipalmitoyl phosphatidyl glycerol (DPPG), whose monolayers were expanded and their compressibility modulus decreased by interacting with chitosans. In general, the effects were stronger for the negatively charged DPPG in comparison to DPPC, and for the low molecular weight chitosan (LMWChi) which was better able to penetrate into the hydrophobic chains than the high molecular weight chitosan (Chi). Penetration into the hydrophobic chains was confirmed with polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS) and sum frequency generation (SFG) spectroscopy. A slight reduction in conformational order of the lipid chains induced by the chitosans was quantitatively estimated by measuring the ratio between the intensities of the methyl (r+) and methylene (d+) peaks in the SFG spectra for DPPG. The ratio decreased from 35.6 for the closely packed DPPG monolayer to 7.0 and 6.6 for monolayers containing Chi and LMWChi, respectively. Since in both cases there was a significant phospholipid monolayer expansion, the incorporation of chitosans led to chitosan-rich and lipid-rich condensed domains, which mantained conformational order for their hydrophobic tails. The stronger effects from LMWChi are ascribed to an easier access to the hydrophobic tails, as corroborated by measuring aggregation in solution with dynamic light scattering, where the hydrodynamic radius for LMWChi was close to half of that for Chi. Taken together, the results presented here confirm that the same mode of action applies to different phospholipids that are important constituents of mammalian (DPPC) and bacterial (DPPG) cell membranes.

  • 7.
    Thapa, Anshu
    et al.
    Univ Sao Paulo, Sao Carlos, SP, Brazil; Univ Bath, England.
    Soares, Andrey Coatrini
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Soares, Juliana Coatrini
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Awan, Iram Taj
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Volpati, Diogo
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Melendez, Matias Eliseo
    Barretos Canc Hosp, Barretos, Brazil.
    Guerreiro Fregnani, Jose Humberto Tavares
    Barretos Canc Hosp, Barretos, Brazil.
    Carvalho, Andre Lopes
    Barretos Canc Hosp, Barretos, Brazil.
    Oliveira, Osvaldo N., Jr.
    Univ Sao Paulo, Sao Carlos, SP, Brazil.
    Carbon Nanotube Matrix for Highly Sensitive Biosensors To Detect Pancreatic Cancer Biomarker CA19-92017In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 31, p. 25878-25886Article in journal (Refereed)
    Abstract [en]

    Biosensors fabricated with nanomaterials promise faster, cheaper, and more efficient alternatives to traditional, often bulky devices for early cancer diagnosis. In this study, we fabricated a thin film sensing unit on interdigitated gold electrodes combining polyethyleneimine and carbon nanotubes in a layer by layer fashion, onto which antibodies anti-CA19-9 were adsorbed with a supporting layer of N-hydroxysuccini-mide and 1-ethyl-3 (3-dimethylaminopropyl) carbodiimide solution. By use of impedance spectroscopy, the pancreatic cancer biomarker CA19-9 was detected in a buffer with limit of detection of 0.35 U/mL. This high sensitivity allowed for distinction between samples of blood serum from patients with distinct probabilities to develop pancreatic cancer. The selectivity of the biosensor was confirmed in subsidiary experiments with HT-29 and SW-620 cell lines and possible interferents, e.g., p53 protein, ascorbic acid, and glucose, where significant changes in capacitance could only be measured with HT-29 that contained the CA19-9 biomarker. Chemisorption of CA19-9 molecules onto the layer of anti-CA19-9 antibodies was the mechanism responsible for sensing while electrostatic interactions drove the adsorption of carbon nanotubes, according to polarization modulated infrared reflection absorption spectroscopy (PM-IRRAS). The adsorption behavior was successfully described by the Langmuir-Freundlich isotherm.

  • 8.
    Volpati, D.
    et al.
    Durham university, UK.
    Massey, M. K.
    Durham university, UK.
    Johnson, D. W.
    Durham university, UK.
    Kotsialos, A.
    Durham university, UK.
    Qaiser, F.
    Durham university, UK.
    Pearson, C.
    Durham university, UK.
    Coleman, K. S.
    Durham university, UK.
    Tiburzi, G.
    Durham university, UK.
    Zeze, D. A.
    Durham university, UK.
    Petty, M. C.
    Durham university, UK.
    Exploring the alignment of carbon nanotubes dispersed in a liquid crystal matrix using coplanar electrodes2015In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 12, article id 125303Article in journal (Refereed)
    Abstract [en]

    We report on the use of a liquid crystalline host medium to align single-walled carbon nanotubes in an electric field using an in-plane electrode configuration. Electron microscopy reveals that the nanotubes orient in the field with a resulting increase in the DC conductivity in the field direction. Current versus voltage measurements on the composite show a nonlinear behavior, which was modelled by using single-carrier space-charge injection. The possibility of manipulating the conductivity pathways in the same sample by applying the electrical field in different (in-plane) directions has also been demonstrated. Raman spectroscopy indicates that there is an interaction between the nanotubes and the host liquid crystal molecules that goes beyond that of simple physical mixing.

  • 9.
    Volpati, D.
    et al.
    UNESP Univ Estadual Paulista, Brazil.
    Spada, E. R.
    Universidade de São Paulo, Brazil .
    Pla Cid, C. C.
    Universidade Federal de Santa Catarina, Brazil .
    Sartorelli, M. L.
    Universidade Federal de Santa Catarina, Brazil .
    Aroca, R. F.
    University of Windsor, Canada .
    Constantino, C. J. L.
    UNESP Univ Estadual Paulista, Brazil.
    Exploring copper nanostructures as highly uniform and reproducible substrates for plasmon-enhanced fluorescence2015In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 140, no 2, p. 476-482Article in journal (Refereed)
    Abstract [en]

    The unique properties of metallic nanostructures of coinage metals that can sustain localized surface plasmon resonances (LSPR) put them at the centre of plasmon-enhanced phenomena. The theory of plasmonic phenomena based on LSPR is well-established. However, the fabrication of plasmonic substrates, reproducibly, is still challenging for applications in surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF). In this work we describe well-ordered copper nanostructures (CuNSs), produced by electrodeposition and nanosphere lithography, as active substrates for SEF. After a detailed spectroscopic and microscopic characterization, CuNSs are successfully applied as SEF-active substrates using a well-known perylene derivative as a target molecule. The signal reproducibility from CuNS substrates was established by comparing the results against those obtained from a simply roughened Cu substrate. Under optimal conditions, signal variability is around 4%.

  • 10.
    Volpati, Diogo
    et al.
    University of São Paulo, Brazil.
    Aoki, Pedro H. B.
    UNESP, Brazil.
    Alessio, Priscila
    UNESP, Brazil.
    Pavinatto, Felippe J.
    University of São Paulo, Brazil.
    Miranda, Paulo B.
    University of São Paulo, Brazil.
    Constantino, Carlos J. L.
    UNESP, Brazil.
    Oliveira, Osvaldo N., Jr.
    University of São Paulo, Brazil.
    Vibrational spectroscopy for probing molecular-level interactions in organic films mimicking biointerfaces2014In: Advances in Colloid and Interface Science, ISSN 0001-8686, E-ISSN 1873-3727, Vol. 207, no Special Issue: Helmuth Möhwald Honorary Issue, p. 199-215Article in journal (Refereed)
    Abstract [en]

    Investigation into nanostructured organic films has served many purposes, including the design of functionalized surfaces that may be applied in biomedical devices and tissue engineering and for studying physiological processes depending on the interaction with cell membranes. Of particular relevance are Langmuir monolayers, Langmuir-Blodgett (LB) and layer-by-layer (LbL) films used to simulate biological interfaces. In this review, we shall focus on the use of vibrational spectroscopy methods to probe molecular-level interactions at biomimetic interfaces, with special emphasis on three surface-specific techniques, namely sum frequency generation (SFG), polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS) and surface-enhanced Raman scattering (SERS). The two types of systems selected for exemplifying the potential of the methods are the cell membrane models and the functionalized surfaces with biomolecules. Examples will be given on how SFG and PM-IRRAS can be combined to determine the effects from biomolecules on cell membrane models, which include determination of the orientation and preservation of secondary structure. Crucial information for the action of biomolecules on model membranes has also been obtained with PM-IRRAS, as is the case of chitosan removing proteins from the membrane. SERS will be shown as promising for enabling detection limits down to the single-molecule level. The strengths and limitations of these methods will also be discussed, in addition to the prospects for the near future.

  • 11.
    Volpati, Diogo
    et al.
    University of São Paulo, Brazil.
    Chachaj-Brekiesz, Anna
    Jagiellonian University, Poland.
    Souza, Adriano L.
    University of São Paulo, Brazil.
    Rimoli, Caio Vaz
    University of São Paulo, Brazil.
    Miranda, Paulo B.
    University of São Paulo, Brazil.
    Oliveira, Osvaldo N., Jr.
    University of São Paulo, Brazil.
    Dynarowicz-Latka, Patrycja
    Jagiellonian University, Poland.
    Semifluorinated thiols in Langmuir monolayers: A study by nonlinear and linear vibrational spectroscopies2015In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 460, p. 290-302Article in journal (Refereed)
    Abstract [en]

    A series of semifluorinated thiols of the general formula CmF2m+1CnH2nSH (abbr. FmHnSH) have been synthesized and characterized in Langmuir monolayers with surface pressure-area isotherms, complemented with polarization-modulated reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation (SFG) techniques. A comparative analysis was performed for compounds having the same length of fluorinated segment (F-10) and variable length of the hydrogenated part (H-6, H-10, H-12), and having identical hydrogenated segment (H-12) connected to a fluorinated moiety of different lengths (F-6, F-8, F10). For the sake of comparison, an alkanethiol (H18SH) was also examined, and F10H10COOH and F10H10OH molecules were used for helping the assignment of SFG spectra of CH stretches. SFG was applied to investigate the hydrocarbon chain and the terminal CF3 group, while PM-IRRAS was used to probe CF2 groups. The number of gauche defects in the hydrocarbon chain increased with the increasing length of the molecule, either by elongation of the hydrogenated or perflu-orinated part. SFG measurements recorded at three polarization combinations (ppp, ssp, sps) enabled us to estimate the tilt angle of the terminal CF3 group in semifluorinated thiol molecules as ranging from 35 to 45, which is consistent with nearly vertical fluorinated segments. Upon increasing the surface pressure, the fluorinated segment gets slightly more upright, but the hydrocarbon chain tilt increases while keeping the same average number of gauche defects. The extent of disorder in the hydrogenated segment may be controlled by varying the size of the fluorinated segment, and this could be exploited for designing functionalized surfaces with insertion of other molecules in the defect region.

  • 12.
    Volpati, Diogo
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. Sol Voltaics AB, Lund, Sweden.
    Mårtensson, Niklas
    Sol Voltaics AB, Lund, Sweden.
    Anttu, Nicklas
    Sol Voltaics AB, Lund, Sweden.
    Viklund, Per
    Sol Voltaics AB, Lund, Sweden.
    Sundvall, Christian
    Sol Voltaics AB, Lund, Sweden.
    Åberg, Ingvar
    Sol Voltaics AB, Lund, Sweden.
    Bäckström, Joakim
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Olin, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Björk, Mikael
    Sol Voltaics AB, Lund, Sweden.
    Castillo-Leon, Jaime
    Sol Voltaics AB, Lund, Sweden.
    Spectroscopic investigations of arrays containing vertically and horizontally aligned silicon nanowires2016In: Materials Research Express, ISSN 2053-1591, Vol. 3, no 12, article id 125021Article in journal (Refereed)
    Abstract [en]

    The properties of nanowire arrays have been investigated mainly in comparison with isolated nanowires or thin films, owing to the difficulty in controlling the nanowire alignment. In this study, we report on arrays containing vertically or horizontally aligned silicon nanowires, whose alignment and structure were determined using x-ray diffraction and scanning electron microscopy. The Raman spectra of the nanowire arrays differ from those of isolated nanowires because of distinct heat dissipation rates of the absorbed energy from the laser, in agreement with recent theoretical calculations. The tailored alignment of the nanowires on solid substrates up to 1 inch of diameter also enabled the observation of resonance modes associated with light trapped into the nanowires. This was proven by comparing the light absorbed and scattered by the arrays, and may be exploited to enhance light harvesting in tandem solar cells. Significantly, the control of the assembly of nanowire arrays may have a direct impact on bottom-up technologies of high anisotropy nanomaterials.

1 - 12 of 12
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf