Acetone sensing of Au and Pd-decorated WO3 nanorods sensors

Significance statement

A variety of techniques have been employed to synthesize Pd/Au bimetallic nanoparticles such as coprecipitation, ultrasound irradiation, sequential reduction. Most of these techniques are quite complicated. On the other hand, an alternative bimetallic catalyst functionalization method is codecoration in which nanostructures are codecorated with two different kinds of metal catalyst nanoparticles. This codecoration differs from functionalization with bimetallic catalyst particles in that a particle is composed of only one kind of metal catalyst. This alternative is attractive because its process is simple but offers enhanced sensing properties similar to functionalization with bimetallic catalyst particles. However, few studies have been performed on the effects of codecoration on the gas sensing properties of nanostructures. This study examined the sensing properties of WO3 nanorods codecorated with Pd and Au nanoparticles toward acetone. The WO3 nanorods codecorated with Au and Pd nanoparticles showed far stronger response to acetone gas and far higher response increasing rate with acetone concentration than the monometal-decorated counterparts. Au,Pd-codecoration showed synergistic effect in enhancing the sensitivity of the WO3 nanorod sensor to acetone gas. The underlying mechanism of the enhanced response of the WO3 nanorods codecorated with Au and Pd nanoparticles are also discussed.

 

Acetone sensing of Au and Pd-decorated WO3 nanorods sensors . Advances In Engineering

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Acetone sensing of Au and Pd-decorated WO3 nanorods sensors. Advances In Engineering

 

 

 

 

 

 

 

 

 

 

 

Journal Reference

Sensors and Actuators B: Chemical, Volume 209, 31 March 2015, Pages 180–185.

Soohyun Kim, Sunghoon Park, Suyoung Park, Chongmu Lee.

Department of Materials Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Republic of Korea.

Abstract

The sensing properties of WO3 nanorods decorated with both Pd and Au nanoparticles toward acetone were examined. AuPd-decorated WO3 nanorods were prepared by immersing the WO3 nanorods in an acetone/(25 mM) HAuCl4/(25 mM) PdCl2 solution followed by UV irradiation and annealing. The WO3nanorods decorated with Au and Pd nanoparticles exhibited a far stronger response to acetone gas that increased with increasing acetone concentration than the monometal-decorated counterparts. XPS analysis showed that considerable alloy formation has occurred during the annealing process of the Au and Pd nanoparticle-decorated WO3 nanorods. Overall, Au and Pd particle-decoration had a synergistic effect on enhancing the sensitivity of the WO3 nanorod sensor to acetone gas. The underlying mechanism of the enhanced response of the Au/Pd bimetallic particle-decorated WO3 nanorods is also discussed.

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