Microwave assisted hydrothermal synthesis of Au@TiO2 core–shell nanoparticles for high temperature CO sensing applications
Microwave assisted hydrothermal synthesis of Au@TiO2 core–shell nanoparticles for high temperature CO sensing applications
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DOI：
10.1016/j.snb.2013.06.038
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发表时间：
2013-09
影响因子：
8.4
通讯作者：
Y. Kim;Prabhakar Rai;Yeon-Tae Yu
中科院分区：
文献类型：
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作者：
Y. Kim;Prabhakar Rai;Yeon-Tae Yu
采用微波辅助水热法在1 h内合成了Au@ TiO 2核壳纳米粒子（NPs）。采用胶体法制备了粒径为40 ± 5 nm的Au纳米粒子。采用微波辅助水热法在Au NPs表面制备了厚度为60 ± 10 nm的TiO 2壳层。初级TiO 2 NP的平均粒度为15 ± 3 nm。Au NPs的表面等离子体激元（SP）带在TiO 2壳形成后从521 nm红移到565 nm。即使这些Au@ TiO 2核-壳纳米颗粒在900 °C下烧结，也没有从金红石到金红石的相变。Au@ TiO 2核壳纳米粒子的传感器响应高于裸TiO 2纳米粒子。Au@ TiO 2核壳纳米粒子的响应随CO浓度的增加而增加。响应进一步增加，随着测试温度的增加，但随着烧结温度的增加而降低。
Au@TiO2core–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. TiO2shell layer with 60 ± 10 nm shell thickness was deposited on Au NPs by microwave assisted hydrothermal method. The average particle size of primary TiO2NPs was 15 ± 3 nm. The surface plasmon (SP) band of Au NPs was red-shifted from 521 nm to 565 nm after TiO2shell formation. There was no phase transition from anatase to rutile even these Au@TiO2core–shell NPs were sintered at 900 °C. The sensor response of Au@TiO2core–shell NPs was higher than bare TiO2NPs. The response of Au@TiO2core–shell NPs increased with increasing CO concentration. The response further increased with increasing testing temperature but decreased with increasing sintering temperature.