MXene/SnS2 Heterojunction for Detecting Sub-ppm NH3 at Room Temperature

• DOI: 10.1021/acsami.2c18097
• Publication Date: 2023-01-12T04:26:42Z
• Authors: Tingting He; Shupeng Sun; Baoyu Huang; Xiaogan Li
• Keywords: 0103 physical sciences; 01 natural sciences

Detection of ultralow concentrations ammonia is very important in many applications such as fishing, poultry, agriculture, industry, biomedicine, and clinical diagnosis. However, detecting sub-ppm NH3 remains a challenge for chemiresistive-type gas sensors. Two-dimensional (2D) materials display tremendous potential effective detectors that can be used these applications. The as-developed MXene/SnS2 heterojunction-based sensor presents superior gas-sensing performance toward at room temperature. detect down to 10 ppb It also displays excellent long-term stability, with decline the response ∼3.4% 20 days. developed good selectivity relative some interferents, HCHO, C2H5OH, CH3OH, C3H6O, benzene, NO2. measured situ diffuse-reflectance infrared Fourier transform (DRIFT) spectra confirm products nitric oxides during chemical reactions occurred surface MXene/SnS2. Density functional theory (DFT) based on first principles was implemented compute adsorption ability heterostructure. This indicates enhancement sensing properties heterostructure-based chemosensor could ascribed stronger adsorption, better catalytical activity, more charge transfer bestowed by formed heterostructure electron-redistribution-assisted extraction electrons from material.