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Sintering Inhibition of Silver Nanoparticle Films via AgCl Nanocrystal Formation
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0003-2340-2363
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0001-9137-3440
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0001-7329-3359
2017 (English)In: Nanomaterials, ISSN 2079-4991, Vol. 7, no 8, article id 224Article in journal (Refereed) Published
Abstract [en]

Electrically conductive films are key components in most printed and flexible electronics applications. For the solution processing of conductive films, inks containing silver nanoparticles (AgNPs) remain important because of their relatively easy processing and generally low resistivity after a sintering procedure. Because the commonly used, moderate sintering temperatures of 150-300 °C are still too high for most low-cost flexible substrates, expanding the knowledge of surface-ink interactions that affect the sintering temperature is desirable. It is known that chloride ions can assist the sintering of AgNP films by displacing capping agents on the surfaces of AgNPs. However, very little is known about other possible Cl-AgNP interactions that affect the resistivity and no interaction having the opposite effect (sintering inhibition) has been identified before. Here we identify such a Cl-AgNP interaction giving sintering inhibition and find that the mechanism involves the formation of AgCl nanocrystals within the AgNP film. The AgCl formation was observed after inkjet-printing of AgNP inks with polyvinylpyrrolidone (PVP) as the capping agent onto papers with quick-absorbing coatings containing 0.3 wt % KCl. Our findings show that chloride can have opposite roles during sintering, either assisting or inhibiting the sintering depending on the prevalence of AgCl formation. The prevalence of AgCl formation depends on the absorption properties and the capping agent.

Place, publisher, year, edition, pages
2017. Vol. 7, no 8, article id 224
Keyword [en]
chemical sintering, flexible electronics, flexible substrates, inkjet printing, paper coatings, papers, printed electronics, silver nanoparticles, sintering, thin films
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:miun:diva-31489DOI: 10.3390/nano7080224ISI: 000408759500030Scopus ID: 2-s2.0-85027834420OAI: oai:DiVA.org:miun-31489DiVA, id: diva2:1136450
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-11-29Bibliographically approved

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Publisher's full textScopushttps://www.ncbi.nlm.nih.gov/pubmed/28817099

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Öhlund, ThomasHummelgård, MagnusOlin, Håkan

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