Journal
APPLIED SURFACE SCIENCE
Volume 599, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153980
Keywords
White light-enhanced; Solution calcination; Morphology transition; Mesoporous ZnO nanoplates; Room temperature sensor
Categories
Funding
- National Natural Science Foundation of China [61904118, 22002102]
- Natural Science Foundation of Jiangsu [BK20190935, BK20190947]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJA210005]
- Jiangsu Key Laboratory for Environment Functional Materials
- State Key Laboratories of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Ask authors/readers for more resources
A highly sensitive gas sensor for detecting NO2 at room temperature has been developed using N-doped carbon nanosheets-incorporated zinc oxide. The sensor exhibits fast response time, high selectivity, and cyclic stability, and the performance can be further improved by white light illumination.
Highly-sensitive gas sensors operating at room temperature (RT) have been pursued by researchers due to their high security, energy saving and long-term stability. Herein, N-doped carbon nanosheets-incorporated zinc oxide (NCZ) was synthesized via solution calcination combined with hydrothermal method and utilized for ppb level detection of NO(2 )at RT. Intriguingly, the construction of N-doped carbon nanosheets was accompanied by generation of ZnO nanoparticles, and then be transferred into mesoporous nanoplates. The as-synthesized NCZ (120)-300 nanocomposites demonstrated high sensitivity to 3 ppm NO2 (|R-g-R-0|/R-0=~ 28.2), along with fast response/recovery (60 s/129 s) speed, excellent selectivity and cyclic stability. In particular, the morphology transition of ZnO greatly enhanced the RT NO2 sensing performance of the as-prepared sensor. Meanwhile, the white light illumination further ameliorated the sensor's properties involving ~ 2.1 times enhancement of sensitivity and shorter recovery process (accelerated from 563 s to 129 s). These enhancements are ascribed to the heterostructure between ZnO nanoplates and N-doped carbon nanosheets, and the modulation of electron structure by photo-generated electron-hole pairs. In addition, the 2D N-doped carbon nanosheets and mesoporous ZnO nanoplates offer numerous active adsorption-sites, which improved the surface chemical activity of NCZ(120)-300.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available