Gas sensor based on three dimensional Bi2S3 nanowires network for ammonia detection at room temperature

• Published in: Materials research bulletin Vol. 99; pp. 460 - 465
• Main Author: Fu, Tie-Xiang
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 01.03.2018
• Subjects: A. Nanostructures; A. Semiconductors; ACETAMIDE; ADSORPTION; AMMONIA; B. Chemical synthesis; BISMUTH IONS; BISMUTH NITRATES; BISMUTH SULFIDES; C. Electron microscopy; CONCENTRATION RATIO; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; D. Electrochemical properties; DETECTION; ELECTRONS; GRAIN GROWTH; NANOWIRES; SENSORS; SOLS; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; THREE-DIMENSIONAL LATTICES; ULTRASONIC WAVES; B. Chemical synthesis; C. Electron microscopy; D. Electrochemical properties; A. Nanostructures; A. Semiconductors
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2017.11.038

[Display omitted] •Three dimensional Bi2S3 nanowires networks.•High response to NH3 gas.•Good selectivity.•Wide linear range.•Work at room temperature. A film containing three dimensional Bi2S3 nanowires network was obtained using Bi(NO3)3 and thioacetamide as starting materials through three steps, namely the chemical synthesis of Bi2S3, preparation of its sol under ultrasonic condition and crystal self-assembly at 25 °C. The nanowires had diameters of 20–100 nm. The formation mechanism of the 3D nanowires network is the anisotropic growth of Bi2S3. The sensor based on 3D Bi2S3 nanowires network with an excellent response to ammonia at 30 °C. The response mechanism of the sensor for ammonia is a weak coordination adsorption of ammonia molecule on the Bi2S3 nanowires and the electron is partially transferred from ammonia molecule to bismuth (III) ion. The maximum response of the sensor to ammonia was up to 82.3 and had a good linear range from 30 to 350 ppm concentration, indicating its potential applications in the determination and leak alarm of ammonia.