title: Nanostructured α-MoO3 thin film as a highly selective TMA sensor.
abstract: Molybdenum trioxide thin films of different thicknesses were prepared on a glass substrate with the chemical spray pyrolysis technique. The X-ray diffraction pattern indicates the formation of an α-MoO3 phase with a polycrystalline nature. The field-emission scanning electron micrograph of the surface indicates nanostructured lamellar crystallites. The trimethylamine vapour sensing property of the film was studied by the chemiresistive method at room temperature (≈ 30°C). Film with a thickness of 520 nm shows a response of 12% for 0.5 ppm of TMA vapour in 54% relative humidity, with response and recovery times of 32s and 15s, respectively. The detection limit and sensing response of the α-MoO3 thin film in a mixed environment were analysed and reported.
authors.affiliation: Centre for Nanotechnology & Advanced Biomaterials (CeNTAB), School of Electrical & Electronics Engineering, SASTRA University, Thanjavur 613401, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Pandeeswari
authors.forename: B G
authors.initials: BG
authors.lastname: Jeyaprakash
mesh_terms: D015374:Biosensing Techniques; D005740:Gases / Q000737:chemistry; D008744:Methylamines / Q000737:chemistry / Q000302:isolation & purification*; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D005740:Gases; D008744:Methylamines; D010087:Oxides; C082290:molybdenum trioxide; D008982:Molybdenum; C023336:trimethylamine
keywords: Chemiresistive; Relative humidity; Spray pyrolysis; Thin film; Trimethylamine; α-MoO(3)