Direct preparation of silver nanoparticles and thin films in CO sub(2)-expanded hexane

Small, uniform and suspended silver nanoparticles were directly prepared in CO sub(2)-expanded hexane by reducing a synthesized metal precursor, silver isostearate, with hydrogen but without introducing additional capping agents. By increasing CO sub(2) pressure, the suspended silver nanoparticles c...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2014-05, Vol.89, p.137-142
Main Authors: Huang, Yi-Chen, Yen, Clive H, Lin, Hsin-Wei, Tan, Chung-Sung
Format: Article
Language:English
Subjects:
Annealing
Carbon dioxide
Deposition
Hexanes
Nanoparticles
Reagents
Silver
Thin films
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Summary:Small, uniform and suspended silver nanoparticles were directly prepared in CO sub(2)-expanded hexane by reducing a synthesized metal precursor, silver isostearate, with hydrogen but without introducing additional capping agents. By increasing CO sub(2) 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 super(-6) Omega cm) after applying an annealing process. Due to the deposition of nano-sized silver particles, the annealing temperature could be as low as 175 degree C that is lower than the softening points of many transparent polymeric substrates used for fabrication of flexible conductive films.
ISSN:0896-8446
DOI:10.1016/j.supflu.2014.03.003