Journal
CHEMOSENSORS
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/chemosensors10080327
Keywords
Ni doping; ZnO; gas sensor; toluene; core-shell structure
Funding
- Major National Science and Technology Special Projects [2016ZX02301003-004-007]
- National Natural Science Foundation of China [62003123]
- National Natural Science Foundation of Hebei Province [F2020202067]
- Key Laboratory of Electronic Materials and Devices of Tianjin, China
- National Demonstration Center for Experimental (Electronic and Communication Engineering) Education (Hebei University of Technology)
Ask authors/readers for more resources
In this study, Ni-doped ZnO sensitive materials with a core-shell morphology were synthesized for the detection of toluene gas. The materials exhibited excellent sensing performance, including high selectivity, fast response/recovery characteristics, and low detection limit. Various characterization methods were employed to analyze the sensitive materials.
As a volatile organic compound, toluene is extremely harmful to the environment and human health. In this work, through a simple one-step solvothermal method, Ni-doped ZnO sensitive materials (0.5, 1, and 2 at% Ni-doped ZnO) with a core-shell morphology were synthesized for the first time for toluene gas detection. The sensing test results showed that the sensor based on 1 at% Ni-doped ZnO exhibited the best toluene sensing performance. The response was up to 210 to 100 ppm toluene at 325 degrees C. The sensor exhibited high selectivity, fast response/recovery characteristics (2/77 s), and low detection limit (500 ppb, 3.5). Furthermore, we carried out molecular-level research on the sensitive material prepared in this experiment by various characterization methods. The SEM characterization results showed that ZnO and Ni-doped ZnO possessed the core-shell morphology, and the average grain size decreased with the increase in the Ni doping content. The UV-Vis test showed that the band gap of ZnO became smaller with the increase in the Ni doping amount. The enhanced toluene sensing performance of 1 at% Ni-doped ZnO could be ascribed to the structural sensitization and Ni doping sensitization, which are discussed in detail in the sensing mechanism section.
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