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Örtegren, Jonas
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Publications (10 of 43) Show all publications
Olsen, M., Zhang, R., Örtegren, J., Andersson, H., Yang, Y. & Olin, H. (2019). Frequency and voltage response of a wind-driven fluttering triboelectric nanogenerator. Scientific Reports, 9(1), Article ID 5543.
Open this publication in new window or tab >>Frequency and voltage response of a wind-driven fluttering triboelectric nanogenerator
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, article id 5543Article in journal (Refereed) Published
Abstract [en]

Triboelectric nanogenerators (TENG:s) are used as efficient energy transducers in energy harvesting converting mechanical energy into electrical energy. Wind is an abundant source of mechanical energy but how should a good triboelectric wind harvester be designed? We have built and studied a TENG driven by air flow in a table-top sized wind tunnel. Our TENG constitutes of a plastic film of size10 cm × 2 cm which is fluttering between two copper electrodes generating enough power to light up a battery of LED:s. We measured the voltage and frequency of fluttering at different wind speeds from zero up to 8 m/s for three electrode distances 6 mm, 10 mm and 14 mm. We found that the frequency increases linearly with the wind speed with a cutoff at some low speed. Power was generated already at 1.6 m/s. We seem to be able to explain the observed frequency dependence on wind speed by assuming excitation of the film into different harmonics in response to von Kármán vortices. We also find that the voltage increase linearly with frequency. We anticipate that TENG:s of this design could be useful both as generators and speed sensors because they work at low air speeds.

National Category
Natural Sciences Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-35936 (URN)10.1038/s41598-019-42128-7 (DOI)000463178500004 ()30944397 (PubMedID)2-s2.0-85063884794 (Scopus ID)
Funder
J. Gust. Richert stiftelseSwedish Energy AgencyKnowledge FoundationEuropean Regional Development Fund (ERDF)
Note

Forskningsfinansiär: Länsstyrelsen Västernorrland

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-07-08Bibliographically approved
Zhang, R., Hummelgård, M., Örtegren, J., Olsen, M., Andersson, H. & Olin, H. (2019). Interaction of the human body with triboelectric nanogenerators. Nano Energy, 57, 279-292
Open this publication in new window or tab >>Interaction of the human body with triboelectric nanogenerators
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 57, p. 279-292Article in journal (Refereed) Published
Abstract [en]

The use of triboelectric nanogenerators (TENGs) is a new technique for energy harvesting at both small and large scales. Almost all types of mechanical energy can be harvested with TENGs by using four modes of operation that cover almost all mechanical motions. The interactions of the human body with TENGs range from energy harvesting, motion sensing, and biomedical applications to human-computer communications. Different types of TENGs have been developed to directly or indirectly involve the human body. This review will summarize the recent advances in the interaction of the human body with TENGs.

Keywords
Energy harvesting, Healthcare, Human body, Human-robot interactions, Sensors, Triboelectric nanogenerators
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-35386 (URN)10.1016/j.nanoen.2018.12.059 (DOI)000458419000028 ()2-s2.0-85059038089 (Scopus ID)
Available from: 2019-01-06 Created: 2019-01-06 Last updated: 2019-03-18Bibliographically approved
Zhang, R., Hummelgård, M., Örtegren, J., Yang, Y., Andersson, H., Balliu, E., . . . Olin, H. (2019). Sensing body motions based on charges generated on the body. Nano Energy, 63, Article ID 103842.
Open this publication in new window or tab >>Sensing body motions based on charges generated on the body
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 63, article id 103842Article in journal (Refereed) Published
Abstract [en]

The sensing of body motions is of great importance in areas such as healthcare, rehabilitation, and human-computer interactions. Different methods have been developed based on visual or electrical signals. However, such signals are acquired by external devices and are not intrinsic signals that are created on the body. Here, we report a new universal body motion sensor (UBS) to detect motions based on the intrinsic contact electrification (CE) of the skin or electrical induction (EI) of the body. The CE or EI generates charges on the body, leading to potential differences between the body and ground that can be measured to identify different body motions, such as motions of the head, arms, fingers, waist, legs, feet and toes. Proof-of-concept experiments have demonstrated that the UBS can be used to monitor the conditions of people with Parkinson's disease (PD) and to quantitatively monitor the recovery of those with a leg injury, suggesting great potential for healthcare applications.

Keywords
Body motions, Sensors, Charges, Contact electrification, Electrical induction, Healthcare
Identifiers
urn:nbn:se:miun:diva-36826 (URN)10.1016/j.nanoen.2019.06.038 (DOI)000480422400034 ()
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-09-02Bibliographically approved
Zhang, R., Örtegren, J., Hummelgård, M., Olsen, M., Andersson, H. & Olin, H. (2018). Harvesting triboelectricity from the human body using non-electrode triboelectric nanogenerators. Nano Energy, 45, 298-303
Open this publication in new window or tab >>Harvesting triboelectricity from the human body using non-electrode triboelectric nanogenerators
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 45, p. 298-303Article in journal (Refereed) Published
Abstract [en]

Triboelectrification has been known and discussed since antiquity. Triboelectrification occurs in the human body due to friction between human skin and other materials such as clothing. However, charges on the body have not been harvested to power small electronics. Here, we report for the first time that the electricity generated on the human body due to triboelectrification can be measured and harvested using human body-based non-electrode triboelectric nanogenerators (H-TENGs). The H-TENGs can have an output of up to 3.3 W/m(2) and can spontaneously harvest energy from several people. The functions of the human body in the H-TENGs are analyzed and experimentally proven to be those of a triboelectric material, conductor and capacitor. Our results demonstrate that the triboelectricity generated on a human body can be harvested using H-TENGs and provide scientific insights into body functions that will promote further studies of TENGs.

Keywords
Human body, Non-electrode TENG, Mechanisms, Charges
National Category
Medical Biotechnology
Identifiers
urn:nbn:se:miun:diva-33301 (URN)10.1016/j.nanoen.2017.12.053 (DOI)000425396400033 ()2-s2.0-85043782783 (Scopus ID)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-03-28Bibliographically approved
Zhang, R., Engholm, M., Hummelgård, M., Andersson, H., Örtegren, J. & Olin, H. (2018). High-performance transparent and flexible electrodes made by flash-light sintering of gold nanoparticles. ACS Applied Energy Materials, 1(12), 7191-7198
Open this publication in new window or tab >>High-performance transparent and flexible electrodes made by flash-light sintering of gold nanoparticles
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2018 (English)In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 1, no 12, p. 7191-7198Article in journal (Refereed) Published
Abstract [en]

Metallic nanowire-based transparent electrodes (TEs) are potential alternatives to indium tin oxide (ITO). To achieve a high performance [sheet resistance (Rs) < 100 Ω/sq, transmittance (T%) > 90%], the nanowires must have a high length-to-diameter (L/D) ratio to minimize the number of wire-to-wire junctions. Attempts to produce TEs with gold nanowires have been made, and the results reveal difficulties in achieving the requirements. A successful strategy involves creating templated gold nanonetworks through multiple procedures. Here, we present a simple and efficient method that uses flash-light sintering of a gold nanonetwork film into gold TEs (Rs: 82.9 Ω/sq, T %: 91.79%) on a thin polycarbonate film (25 μm). The produced gold TEs have excellent mechanical, electrical, optical, and chemical stabilities. Mechanisms of the formation of gold nanonetworks and the effect of flash-light have been analyzed. Our findings provide a scalable process for producing transparent and flexible gold electrodes with a total processing time of less than 8 min without the use of heating, vacuum processing, and organic chemicals and without any material loss. This is possible because all the gold nanoparticles have been aggregated and filtrated on the filter membranes. The area density of gold is 0.094 g/m2 leading low material costs, which is very competitive with the price of commercial TEs.

Keywords
transparent electrode, flexible electrode, gold nanoparticles, flash-light sintering, high performance
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:miun:diva-35380 (URN)10.1021/acsaem.8b01649 (DOI)000458706800063 ()2-s2.0-85064752503 (Scopus ID)
Available from: 2019-01-03 Created: 2019-01-03 Last updated: 2019-07-08Bibliographically approved
Zhang, R., Hummelgård, M., Örtegren, J., Olsen, M., Andersson, H., Yang, Y. & Olin, H. (2018). Human body constituted triboelectric nanogenerators as energy harvesters, code transmitters and motion sensors. ACS Applied Energy Materials, 1(6), 2955-2960
Open this publication in new window or tab >>Human body constituted triboelectric nanogenerators as energy harvesters, code transmitters and motion sensors
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2018 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 1, no 6, p. 2955-2960Article in journal (Refereed) Published
Abstract [en]

Human skin is a dielectric material that can be used as a triboelectric material for harvesting energy from body motions. The output power of such a human skin-based triboelectric nanogenerator (TENG) is relatively low. Here, we assembled high-output human body constituted TENGs (H-TENGs) by taking advantage of the unique electrical properties of the human body, such as high skin impedance, low tissue resistance, body capacitance, and conductivity. The output of a H-TENG can reach 30 W/m2, which is enough to drive small electronic devices, such as a timer or a calculator. The unique feature of the H-TENG is that it can perform the four fundamental modes of TENGs, which has not been reported elsewhere. Such a feature allows the H-TENG to act as a code transmitter to send light and electrical signals, such as Morse code. H-TENGs also benefit the development of high-performance, self-powered body motion sensors. Our findings suggest new strategies for harvesting energy from human body motions, as well as new types of motion sensors and signal senders.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
code transmitters; energy harvesting; human body; motion sensors; triboelectric nanogenerators
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-34433 (URN)10.1021/acsaem.8b00667 (DOI)000458705800070 ()
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2019-03-15Bibliographically approved
Zhang, R., Hummelgård, M., Forsberg, V., Andersson, H., Engholm, M., Öhlund, T., . . . Olin, H. (2018). Photoconductivity of acid exfoliated and flash-light-processed MoS2 films. Scientific Reports, 8, Article ID 3296.
Open this publication in new window or tab >>Photoconductivity of acid exfoliated and flash-light-processed MoS2 films
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 3296Article in journal (Refereed) Published
Abstract [en]

MoS2 has been studied intensively during recent years as a semiconducting material in several fields, including optoelectronics, for applications such as solar cells and phototransistors. The photoresponse mechanisms of MoS2 have been discussed but are not fully understood, especially the phenomenon in which the photocurrent slowly increases. Here, we report on a study of the photoresponse flash-light-processed MoS2 films of different thicknesses and areas. The photoresponse of such films under different light intensities and bias voltages was measured, showing significant current changes with a quick response followed by a slow one upon exposure to pulsed light. Our in-depth study suggested that the slow response was due to the photothermal effect that heats the MoS2; this hypothesis was supported by the resistivity change at different temperatures. The results obtained from MoS2 films with various thicknesses indicated that the minority-carrier diffusion length was 1.36 mu m. This study explained the mechanism of the slow response of the MoS2 film and determined the effective thickness of MoS2 for a photoresponse to occur. The method used here for fabricating MoS2 films could be used for fabricating optoelectronic devices due to its simplicity.

National Category
Physical Sciences
Identifiers
urn:nbn:se:miun:diva-33302 (URN)10.1038/s41598-018-21688-0 (DOI)000425380900079 ()29459668 (PubMedID)2-s2.0-85061713034 (Scopus ID)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2019-03-20Bibliographically approved
Olsen, M., Örtegren, J., Zhang, R., Reza, S., Andersson, H. & Olin, H. (2018). Schottky model for triboelectric temperature dependence. Scientific Reports, 8(1), Article ID 5293.
Open this publication in new window or tab >>Schottky model for triboelectric temperature dependence
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 5293Article in journal (Refereed) Published
Abstract [en]

The triboelectric effect, charging by contact, is the working principle in a device called a triboelectric nanogenerator. They are used as efficient energy transducers in energy harvesting. In such generators the charging of surfaces at contact is followed by a separation of the surfaces increasing the electrical energy which can subsequently be used. Different materials have different triboelectric potentials leading to charging at contact. The temperature dependence of the charging has just recently been studied: the triboelectric effect is decreasing with temperature for a generator of Al-PTFE-Cu. Here, we suggest a mechanism to explain this effect assuming ion transfer using a two-level Schottky model where the two levels corresponds to the two surfaces. The difference in binding energy for ions on the two surfaces then enters the formula for charging. We fit the triboelectric power density as a function of temperature obtained from a two-level Schottky model to measured data for nanogenerators made of Al-PTFE-Cu found in three references. We obtain an average separation energy corresponding to a temperature of 365 K which is of the right magnitude for physically adsorbed atoms. We anticipate that this model could be used for many types of triboelectric nanogenerators.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-33379 (URN)10.1038/s41598-018-23666-y (DOI)000428518500004 ()2-s2.0-85044510140 (Scopus ID)
Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2019-05-18Bibliographically approved
Zhang, R., Hummelgård, M., Olsen, M., Örtegren, J. & Olin, H. (2017). Nanogenerator made of ZnO nanosheet networks. Semiconductor Science and Technology, 32(5), Article ID 054002.
Open this publication in new window or tab >>Nanogenerator made of ZnO nanosheet networks
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2017 (English)In: Semiconductor Science and Technology, ISSN 0268-1242, E-ISSN 1361-6641, Vol. 32, no 5, article id 054002Article in journal (Refereed) Published
Abstract [en]

The piezoelectricity of nanomaterials attracts a great deal of attention due to its broad application, including the harvesting of ambient mechanical energy to power small electronics devices. We report here a simple method to fabricate piezoelectric nanogenerators consisting of networks of ZnO nanosheets grown on aluminum (Al) foils, where the Al acts as both a substrate for growth and as an electrode contacting the ZnO network. A second, top electrode was tapped, rolled, or rubbed against the ZnO to generate piezoelectricity. This second electrode was either a copper foil or fluorine doped tin oxide (FTO) glass. A piezo voltage of up to 0.924 V was detected during rolling and 6 μA was the highest current observed when rubbing the ZnO film with a FTO glass. Due to its simplicity, this nanogenerator fabrication method has the potential to be scaled up for the industrial production of piezoelectric energy harvesting devices.

Keywords
nano networks, nanogenerator, piezoelectric, ZnO nanosheet
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:miun:diva-30672 (URN)10.1088/1361-6641/aa660c (DOI)000413490800001 ()2-s2.0-85018449243 (Scopus ID)
Available from: 2017-04-27 Created: 2017-04-27 Last updated: 2018-09-20Bibliographically approved
Niga, P., Örtegren, J., Klaman, M., Blohm, E. & Lofthus, J. (2014). Hybrid package printing. Assessment of the influence of paper media parameters for inkjet printing on flexographic printed paper.. Narrow WebTech (1), 16-22
Open this publication in new window or tab >>Hybrid package printing. Assessment of the influence of paper media parameters for inkjet printing on flexographic printed paper.
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2014 (English)In: Narrow WebTech, ISSN 1617-206X, no 1, p. 16-22Article in journal (Refereed) Published
Abstract [en]

Hybrid printing combining inkjet technology with flexography can be used to add customer specific information in the production of packaging and print. However, in order to improve print quality a comprehensive understanding of the mechanisms governing print quality is required. In this work, inkjet printing using three aqueous inkjet inks was performed on top of flexographic printouts on four paper substrates. The flexographic film contained tone values ranging from 0 to 100% ink coverage. Line quality and print density of the inkjet print were evaluated in order to estimate the influence of paper parameters on the print quality. Specifically, it was found that for the system studied, the flexographic film essentially dictates the surface energy while keeping the porosity and the surface roughness of the paper unaltered. These findings are further supported by micrograph images.

Place, publisher, year, edition, pages
G&K Tech Media GmbH, 2014
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-24007 (URN)
Funder
EU, European Research Council
Available from: 2014-12-22 Created: 2014-12-22 Last updated: 2015-01-02Bibliographically approved
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