Abstract
Au@TiO2 core–shell nanoparticles (NPs) were synthesized by microwave assisted hydrothermal method in 1h. Au NPs with 40±5nm size were synthesized by colloidal method. TiO2 shell layer with 60±10nm shell thickness was deposited on Au NPs by microwave assisted hydrothermal method. The average particle size of primary TiO2 NPs was 15±3nm. The surface plasmon (SP) band of Au NPs was red-shifted from 521nm to 565nm 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.
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