Au@Cu2O core-shell nanoparticles as chemiresistors for gas sensor applications: effect of potential barrier modulation on the sensing performance.
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@Cu2O 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.
Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, College of Engineering, Chonbuk National University, Jeonju 561-756, South Korea. yeontae@jbnu.ac.kr.
Prabhakar
P
Rai
Rizwan
R
Khan
Sudarsan
S
Raj
Sanjit Manohar
SM
Majhi
Kyung-Kuen
KK
Park
Yeon-Tae
YT
Yu
In-Hwan
IH
Lee
Praveen Kumar
PK
Sekhar
D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D005740:Gases / Q000032:analysis*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009569:Nitric Oxide / Q000032:analysis*; D010316:Particle Size; D020349:Surface Plasmon Resonance; D013696:Temperature
D005740:Gases; D009569:Nitric Oxide; D006046:Gold; D003300:Copper; C030973:cupric oxide