Research on stability of photocrosslinked polyvinyl alcohol/silver nanowire composite transparent conductive films
Water-soluble photocrosslinked poly(vinyl alcohol),N-methyl-4(4'-formylstyryl)pyridinium metho-sulfate acetal(SbQ-PVA)solution was coated onto silver nanowire(AgNW)films to form SbQ-PVA/AgNW composite films by a simple solution process.The optical-electrical properties and morphology of AgNW films with different surface densities before and after coating with SbQ-PVA were analyzed,and the mechanical as well as environmental stability of the AgNW films were compared with that of the SbQ-PVA/AgNW composite films.The results show that the SbQ-PVA coating does not affect the electrical conductivity of the silver nanowire network and also enhances the optical properties,resulting in a high transmittance of about 90％for composite films with sheet resistance as low as about 20 Ω/sq.Meanwhile,the mechanical stability of the SbQ-PVA/AgNW composite films is significantly enhanced,with the resistance value changing by only 1％in 5 000 bending cycle tests,and it can withstand the scratching of 3B pencil.The SbQ-PVA also brings excellent envi-ronmental stability to the composite films,which can maintain the resistance and morphology stability for 4 months in atmospheric environment,and it can also be well resisted to the corrosion of acid,alkali,and salt so-lutions.In addition,the SbQ-PVA/AgNW composite films are able to remain stable in deionized water ultra-sonication,and this feature can be utilized with a photomask for one-step patterning of silver nanowire films.SbQ-PVA/AgNW composite films with high photovoltaic performance and stability offer new possibilities to re-alize high-quality flexible transparent electrodes in a simple,environmentally friendly and efficient way.
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