Journal
SENSORS
Volume 18, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/s18092882
Keywords
ZnS nanosphere; Au nanoparticle; room temperature; formaldehyde sensor
Funding
- National Natural Science Foundation of China [21771157, U1703251]
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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.
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