Au@Cu2O 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

111 Citations (Scopus)

Abstract

Au@Cu2O 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 2O core-shell NPs, where 12-15 nm Au NPs were covered with 60-30 nm Cu2O shell layers. The surface plasmon resonance (SPR) peak of Au NPs was red-shifted (520-598 nm) after Cu2O shell formation. The response of Au@Cu2O core-shell NPs was higher than that of bare Cu2O NPs to CO at different temperatures and concentrations. Similarly, the response of Au@Cu2O core-shell NPs was higher than that of bare Cu2O NPs for NO2 gas at low temperature. The improved performance of Au@Cu2O 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

ASJC Scopus subject areas

  • Materials Science(all)

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