Direct preparation of silver nanoparticles and thin films in CO2-expanded hexane |
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Affiliation: | 1. School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Hongshan, Wuhan, Hubei 430070, PR China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Hongshan, Wuhan, Hubei 430070, PR China;3. Center for Information Materials, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang, Gyeongbuk 790-784, Republic of Korea;4. China Building Material Institute of Solar-Energy Application, Zhenjiang, Jiangsu 212009, PR China |
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Abstract: | Small, uniform and suspended silver nanoparticles were directly prepared in CO2-expanded hexane by reducing a synthesized metal precursor, silver isostearate, with hydrogen but without introducing additional capping agents. By increasing CO2 pressure, the suspended silver nanoparticles could be further deposited on a solid substrate to form silver thin film via gas antisolvent and the subsequent supercritical drying processes. The silver thin films prepared by the aforementioned method possessed a uniform thickness of about 150 nm without surface cracking and low electrical resistivity (5.64 × 10?6 Ω cm) after applying an annealing process. Due to the deposition of nano-sized silver particles, the annealing temperature could be as low as 175 °C that is lower than the softening points of many transparent polymeric substrates used for fabrication of flexible conductive films. |
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Keywords: | Silver nanoparticles Gas antisolvent Supercritical drying Conductive thin films |
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