期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 154, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physe.2023.115806
关键词
ZnO; Room temperature; Toluene gas sensor; In2O3
In this study, porous core-shell-structured In2O3-ZnO nanofibers were synthesized and their excellent sensing properties for toluene gas were confirmed. The sensor exhibited fast response, excellent selectivity, and long-term stability at room temperature.
Porous core-shell-structured In2O3-ZnO nanofibers (NFs) were synthesized using two-step method. The porous and core-shell structure of the In2O3-ZnO NFs was confirmed using field emission scanning electron microscopy and field emission transmission electron microscopy. Gas sensing experiments showed that the In2O3-ZnO NFs exhibited a response of 34.7-100 ppm of toluene gas at room temperature (RT), which was 5.5- and 6.4-fold higher than that of the pure ZnO NFs and pure In2O3 NFs, respectively. The In2O3-ZnO NFs sensor also demonstrated fast response, excellent selectivity, and long-term stability at RT. The enhanced sensing properties for toluene gas were attributed to the larger specific surface area, higher concentration of chemisorbed oxygen species, and core-shell heterostructure of the In2O3-ZnO NFs. The authors anticipate that this study will facilitate the development of future gas sensors for the detection of toluene gas at RT.
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