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Sensors 2018, 18(9), 2882;

Ni-Doped ZnS Nanospheres Decorated with Au Nanoparticles for Highly Improved Gas Sensor Performance

Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, China
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 27 August 2018 / Accepted: 28 August 2018 / Published: 31 August 2018
(This article belongs to the Section Chemical Sensors)
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Novel Ni-doped wurtzite ZnS nanospheres decorated with Au nanoparticles (Au NPs–ZnS NSs) have been successfully fabricated using a simple method involving vacuum evaporation followed by an annealing process. This transition metal-doped gas sensor had high responsivity, extremely fast response and recovery time, and excellent selectivity to formaldehyde at room temperature. The response and recovery time are only 29 s and 2 s, respectively. Since ZnS is transformed into ZnO at a high temperature, superior room temperature-sensing performance can improve the stability and service life of the sensor. The improvement in sensing performance could be attributed to the reduced charge-transfer distance resulting from the creation of a local charge reservoir layer, and the catalytic and spillover effect of Au nanoparticles. The rough and porous spherical structure can also facilitate the detection and diffusion of gases. The as-prepared Au NPs–ZnS NSs are considered to be an extremely promising candidate material for gas sensors, and are expected to have other potential applications in the future. View Full-Text
Keywords: ZnS nanosphere; Au nanoparticle; room temperature; formaldehyde sensor ZnS nanosphere; Au nanoparticle; room temperature; formaldehyde sensor

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Zhong, F.; Wu, Z.; Guo, J.; Jia, D. Ni-Doped ZnS Nanospheres Decorated with Au Nanoparticles for Highly Improved Gas Sensor Performance. Sensors 2018, 18, 2882.

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