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CO gas sensor properties of Cu@CuO core-shell nanoparticles based on localized surface plasmon resonance
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CO gas sensor properties of Cu@CuO core-shell nanoparticles based on localized surface plasmon resonance

Ghodselahi, T

CO gas sensor properties of Cu@CuO core-shell nanoparticles based on localized surface plasmon resonance

Ghodselahi, T ; Sharif University of Technology | 2011

739 Viewed
  1. Type of Document: Article
  2. DOI: 10.1021/jp204020j
  3. Publisher: 2011
  4. Abstract:
  5. Hexagonal array of Cu@CuO core-shell 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-shell 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-shell NPs have no chemical reaction with CO molecule. The physical absorption of CO molecule on the surface of Cu@CuO core-shell 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-shell increases the dielectric coefficient of the shell. The prepared Cu@CuO core-shell NPs show an average shift of 10-2 nm per molecule absorption, which can lead to detection of a single CO molecule per NP
  6. Keywords:
  7. A-C:H thin film ; Absorbances ; AFM image ; CO absorption ; CO gas sensor ; CO molecule ; Codeposition ; Core-shell ; Core-shell nanoparticles ; Dielectric coefficient ; Hexagonal arrays ; Localized surface plasmon resonance ; Mie theory ; Physical absorption ; Red shift ; Rf-PECVD ; Rf-sputtering ; Room temperature ; XRD ; Absorption ; Chemical detection ; Chemical sensors ; Copper ; Film preparation ; Molecules ; Nanoparticles ; Plasmons ; Surface plasmon resonance ; Shells (structures)
  8. Source: Journal of Physical Chemistry C ; Volume 115, Issue 45 , 2011 , Pages 22126-22130 ; 19327447 (ISSN)
  9. URL: http://pubs.acs.org/doi/abs/10.1021/jp204020j