Effect of CuO as a dopant in TiO2 on ammonia and hydrogen sulphide sensing at room temperature. (August 2016)

• Record Type: Journal Article
• Authors: Chaudhari, Prapti; Mishra, Satyendra
• Is Part Of: Measurement. Volume 90(2016)
• Page Start: 468
• Page End: 474
• Publication Date: 2016-08
• Subjects: Semiconductors -- Oxides -- Sol–gel growth -- Composite materials -- X-ray diffraction; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2016.05.007
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Successful doping of CuO nanoparticles in TiO2 using sol gel method. Increased CuO concentration in TiO2 reduced the nanocomposite size and intensity of photoluminescence spectra. Variations in concentration of CuO and TiO2 changes the selectivity of gas at room temperature. Low concentration of CuO was selective for ammonia and higher concentration was selective for hydrogen sulphide. Abstract: The heterogeneous nanocomposites of CuO doped TiO2 nanoparticles were synthesized using sol gel method by varying the concentration of CuO as 0.1, 0.5 and 1 mol% for the sensing of ammonia and hydrogen sulphide. The substitutional doping of CuO in TiO2 matrix was confirmed by the X-ray diffraction. Average crystallite size of the doped nanocomposites was found to reduce with increase in concentration of CuO. The 0.1 mol% CuO doped TiO2 nanocomposites showed highest sensitivity to ammonia (97%) with response time of 2 s, while 1 mol% was selective to H2 S gas (77%) with response time of 45 s for 50 ppm of each gas at room temperature.