Au@Cu 2 O core-shell nanoparticles as chemiresistors for gas sensor applications: Effect of potential barrier modulation on the sensing performance

Prabhakar Rai, Rizwan Khan, Sudarsan Raj, Sanjit Manohar Majhi, Kyung Kuen Park, Yeon Tae Yu, In-Hwan Lee, Praveen Kumar Sekhar

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Au@Cu 2 O core-shell nanoparticles (NPs) were synthesized by a solution method at room temperature and applied for gas sensor applications. Transmission electron microscopy (TEM) images showed the formation of Au@Cu 2 O core-shell NPs, where 12-15 nm Au NPs were covered with 60-30 nm Cu 2 O shell layers. The surface plasmon resonance (SPR) peak of Au NPs was red-shifted (520-598 nm) after Cu 2 O shell formation. The response of Au@Cu 2 O core-shell NPs was higher than that of bare Cu 2 O NPs to CO at different temperatures and concentrations. Similarly, the response of Au@Cu 2 O core-shell NPs was higher than that of bare Cu 2 O NPs for NO 2 gas at low temperature. The improved performance of Au@Cu 2 O core-shell NPs was attributed to the pronounced electronic sensitization, high thermal stability and low screening effect of Au NPs.

Original languageEnglish
Pages (from-to)581-588
Number of pages8
JournalNanoscale
Volume6
Issue number1
DOIs
Publication statusPublished - 2014 Jan 7
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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