CO Gas Sensor Properties of Cu@CuO Core鈥揝hell Nanoparticles Based on Localized Surface Plasmon Resonance

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• 作者：T. Ghodselahi ; H. Zahrabi ; M. Heidari Saani ; M. A. Vesaghi
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：November 17, 2011
• 年：2011
• 卷：115
• 期：45
• 页码：22126-22130
• 全文大小：853K
• 年卷期：v.115,no.45(November 17, 2011)
• ISSN：1932-7455

文摘

Hexagonal array of Cu@CuO core鈥搒hell nanoparticles (NPs) on the a-C:H thin film was prepared by codeposition of RF-sputtering and RF-PECVD. The trace of hexagonal NPs supperlattice was recognized by AFM image and XRD result. On the basis of localized surface plasmon resonance (LSPR) of core鈥搒hell NPs, the prepared array detected a low flow rate of CO gas at room temperature. XPS results indicate that the surface of Cu@CuO core鈥搒hell NPs have no chemical reaction with CO molecule. The physical absorption of CO molecule on the surface of Cu@CuO core鈥搒hell NPs increases the LSPR absorbance and causes a red shift in LSPR wavelength. These experimental results are in agreement with Mie theory studying provided that CO absorption on the core鈥搒hell increases the dielectric coefficient of the shell. The prepared Cu@CuO core鈥搒hell NPs show an average shift of 10^鈥? nm per molecule absorption, which can lead to detection of a single CO molecule per NP.