Article ID Journal Published Year Pages File Type
740361 Sensors and Actuators B: Chemical 2013 7 Pages PDF
Abstract

Au@TiO2 core–shell nanoparticles (NPs) were synthesized by microwave assisted hydrothermal method in 1 h. Au NPs with 40 ± 5 nm size were synthesized by colloidal method. TiO2 shell layer with 60 ± 10 nm shell thickness was deposited on Au NPs by microwave assisted hydrothermal method. The average particle size of primary TiO2 NPs was 15 ± 3 nm. The surface plasmon (SP) band of Au NPs was red-shifted from 521 nm to 565 nm after TiO2 shell formation. There was no phase transition from anatase to rutile even these Au@TiO2 core–shell NPs were sintered at 900 °C. The sensor response of Au@TiO2 core–shell NPs was higher than bare TiO2 NPs. The response of Au@TiO2 core–shell NPs increased with increasing CO concentration. The response further increased with increasing testing temperature but decreased with increasing sintering temperature.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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