CeO2 Enhanced Ethanol Sensing Performance in a CdS Gas Sensor

Abstract

CdS nanowires (NWs) were fabricated through a facile low-temperature solvothermal method, following which CeO2 nanoparticles were modified on the NWs. The ethanol sensing characteristics of pure CdS and decorated ones with different CeO2 content were studied. It was found that the sensing performance of CdS was significantly improved after CeO2 decoration. In particular, the 5 at% CeO2/CdS composite exhibited a much higher response to 100 ppm ethanol (about 52), which was 2.6 times larger than that of pure CdS. A fast response and recovery time (less than 12 s and 3 s, respectively) were obtained as well as an excellent selectivity. These results make the CeO2-decorated CdS NWs good candidates for ethanol sensing applications.

Recent advances in 2D/nanostructured metal sulfide-based gas sensors: mechanisms, applications, and perspectives

“…For metal sulde-based n-n and p-p heterojunctions, Zhang et al 129 optimized the NH 3 sensing behaviour by using SnS 2 /ZnS hierarchical NFWs. The gas sensors based on metal sulde n-n junctions beneting from metal oxide hybrids, such as CdS/CeO 2 , 130 CdS/ZnO, 131 ZnS/ZnO, 132 and ZnS/CuO, 133 have been employed for the detection of VOC toxic gases. The electrons ow across the heterojunction from the higher Fermi level to the lower one, which induces band bending and EDL formation at the interface.…”

“…In the context of metal sulde/metal oxide heterostructures prepared through hydrothermal methods, MoS 2 /SnO 2 , 119 adsorption, defects, or oxygen vacancies, when a-Fe 2 O into MoS 2 nanosheets. Besides, Li et al 130 modied CdS NWs with CeO 2 NPs and found that the 5 wt% CeO 2 /CdS n-n heterostructures exhibited a much higher response% toward 100 ppm ethanol ($5100%), which was 2.6 times larger than that of pure CdS. The gas sensing properties of different metal sulde-based ethanol sensors are listed in Table 5.…”

NiO decorated CeO2 nanostructures as room temperature isopropanol gas sensors

“…Jie Hu et al synthesized CeO 2 loaded In 2 O 3 hollow spheres and obtained enhanced sensing performance towards hydrogen at 160 C working temperature. 37 Meishan Li et al fabricated a sensor using CeO 2 /CdS composites, which shown a signicant improvement in the sensing performance towards ethanol at an operating temperature of 161 C. 38 In particular, the heterostructure formed between CeO 2 and p-type metal oxides is expected to show better sensing performances owing to their great variation at built-in potential near the p-n interfaces. A few recent studies have proved that the coupling of p-NiO with n-type metal oxides could possibly enhances the heterojunction related properties and results in the improved sensing performance.…”

Diethyl carbonate (DEC) gas sensor based on CeO2 loaded In2O3 hollow spheres for thermal runaway monitoring of Li-ion batteries

“…As a common rare earth oxide material, CeO 2 is widely used in photocatalysis, gas sensing and other fields, and is usually used as a functional material to improve sensor performance. 30,31) In this paper, DEC gas detection will be carried out based on CeO 2 -loaded In 2 O 3 .…”