Room-temperature triethylamine sensing of a chemiresistive sensor based on Sm-doped SnS2/ZnS hierarchical microspheres. (29th July 2022)

• Record Type: Journal Article
• Authors: Li, Feng; Zeng, Ziqiang; Wu, Mingyang; Liu, Leda; Li, Wenlong; Huang, Fobao; Li, Wei; Guan, He; Geng, Wangchang
• Is Part Of: New journal of chemistry. Volume 46:Number 32(2022)
• Page Start: 15701
• Page End: 15711
• Publication Date: 2022-07-29
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj02683j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : An Sm-doped SnS2 /ZnS sensor shows excellent gas-sensing performance towards triethylamine at room temperature. Abstract : Selective detection of noxious gases at low temperature is imperative in some industrial applications. In this work, pure and Sm-doped SnS2 /ZnS hierarchical microspheres were prepared by a sequential reflux condensation and hydrothermal process. The morphology, crystalline structure, defect density and chemistry composition of the as-prepared samples have been analyzed by SEM, TEM, PL, XRD and XPS spectra. Compared with sensors based on pure SnS2 /ZnS samples, the 3.0 at% Sm-doped SnS2 /ZnS samples exhibited a remarkable enhancement in triethylamine-sensing performance at room temperature (∼20 °C), including higher response, fast response/recovery speed, low detection limit and good selectivity. The improved gas sensing performance may be attributed to the SnS2 /ZnS n–n nanoheterojunction, high crystal defect density, Sm 2+ /Sm 3+ redox pairs, grain boundaries and gas channels in the sample. In addition, the gas sensing mechanism of the Sm-doped SnS2 /ZnS hierarchical microspheres was also analyzed.