Enhanced formaldehyde sensing properties of MoS2-Zn2SnO4 nanocomposites synthesized via hydrothermal method

• Published in: Inorganic chemistry communications 2021-05, Vol.127, p.108503, Article 108503
• Main Authors: Akhtar, Ali, Chu, Xiangfeng, Liang, Shiming, Dong, Yongping, He, Lifang, Zhang, Kui
• Format: Article
• Language: English
• Subjects: Formaldehyde vapor; Gas sensor; Hydrothermal method; MoS2; Zn2SnO4
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2021.108503

[Display omitted] •A series of MoS2-Zn2SnO4 composites were synthesized via hydrothermal method.•The sensor of MZSO-5 exposed good sensitivity and selectivity.•The sensor of MZSO-5 could detect 0.01 ppm formaldehyde at 110 °C.•Specific surface area was checked by BET method. For the purpose of detecting indoor formaldehyde, some new nanocomposites MoS2-Zn2SnO4 were synthesized via hydrothermal method, the materials were characterized by XRD, N2 adsorption–desorption isotherms, SEM, EDS and XPS, respectively. From XRD, the formation of Zn2SnO4 was confirmed, besides; increased oxygen contents (XPS) and enhanced surface area (BET) of MZSO-5 together facilitated larger adsorption of formaldehyde, which explained the maximum response of this sample to formaldehyde vapor. The complete study regarding gas sensing measurements stated that MSZO-5 based sensor enhanced the gas sensing response to 100 ppm formaldehyde compared with other tested seven volatile organic compounds (VOCs), the identified response was 22 at 110 °C, while for other VOCs the highest response (7.1) to 100 ethanol was detected, which revealed its good selectivity to formaldehyde; especially, the response reached 1.35 to 0.01 ppm formaldehyde. Thus, it could be a potential candidate for detecting formaldehyde, if its stability was improved.