Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 253, Issue -, Pages 809-817Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.06.183
Keywords
CuO; Gas sensor; Pd doping; p-Type; Low temperature
Funding
- National Natural Science Foundation of China [61471233, 21504051]
- Program for Professor of Special Appointment (Eastern Scholar) at SIHL
- Shuguang Project and Young Teacher Training Project of Shanghai University by Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [14SG52, ZEGD15012]
- Key Subject of Shanghai Polytechnic University (MST) [XXKZD1601]
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A facile method was used to prepare Pd-doped CuO nanoflowers with various doping concentrations. The samples were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), inductively coupled plasma atomic emission spectrometer (ICP-AES), and Brunauer - Emmett - Teller (BET) specific surface area analysis. The responses (R-g/R-a or R-a/R-g, where R-g is the resistance in gas, and R-a is the resistance in air) of such sensors exposed to 50 ppm CH4, NO2, C2H5OH, H2S, NH3, and H-2 were measured for comparison. For 1.25 wt% Pd-doped CuO nanoflowers, the response (R-g/R-a) to 50 ppm H2S was 123.4 at 80 degrees C, which was significantly higher than that of pure CuO (R-g/R-a = 15.7). Furthermore, excellent stability and repeatability of the gas sensor were also demonstrated. The observed results clearly revealed that it is an important and facile approach to detect the H2S at low operating temperature for practical applications. (C) 2017 Elsevier B.V. All rights reserved.
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