Ultrasensitive room-temperature chemical sensors by Ag-decorated ultraporous ZnO nanoparticle networks

被引：1

作者：

Chen, Hongjun ^{[1
]}

Bo, Renheng ^{[1
]}

Qi, Lu ^{[1
]}

Dodd, Aaron ^{[2
]}

Saunders, Martin ^{[2
]}

White, Thomas ^{[1
]}

Tsuzuki, Takuya ^{[1
]}

Tricoli, Antonio ^{[1
]}

机构：

[1] Australian Natl Univ, Res Sch Elect Energy & Mat Engn, Coll Engn & Comp Sci, Canberra, ACT 2601, Australia

[2] Univ Western Australia, Ctr Microscopy Characterisat & Anal, Perth, WA 6009, Australia

来源：

2019 IEEE SENSORS | 2019年

基金：

澳大利亚研究理事会;

关键词：

chemical sensor; room temperature; Ag; ZnO; nanoparticle networks; GAS-SENSING PROPERTIES; RESPONSE ENHANCEMENT; ZINC-OXIDE; NO2; NANOSTRUCTURES;

D O I：

10.1109/sensors43011.2019.8956926

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Highly sensitive room temperature gas sensors consisting of ultraporous ZnO nanoparticle networks decorated with Ag nanoparticles (NPs) were fabricated by nanoparticle aerosol self-assembly and sequential sputtering. Optimization of the AgNPs loading and the thickness of ultraporous ZnO networks lead to a sensor response, defined as the ratio of resistance change, of 1.8 and 7.4 at 0.1 and 1 ppm ethanol concentrations, respectively, at room temperature under light irradiation. This is similar to 10 times higher than that of pure ultraporous ZnO film under the same experimental conditions. Furthermore, the optimal AgNPs-decorated ultraporous ZnO films can detect as low as 5 ppb of ethanol gas at room temperature under light illumination. The high sensitivity of AgNPs-decorated ZnO film can be ascribed to the synergistic effects of the ultraporous nanoparticle network morphology, AgNPs sensitization and light-assisted photo-excited gas-sensing process. These provide directions for the design of high sensitive metal-oxide semiconductor-based gas sensors capable to operate at room temperature.

引用

页数：4

共 38 条

[1] Role of the Exposed Polar Facets in the Performance of Thermally and UV Activated ZnO Nanostructured Gas Sensors [J].