Electrical and gas sensing properties of self-aligned copper-doped zinc oxide nanoparticles |
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Authors: | Yogesh S. Sonawane B.B. Kale R.C. Aiyer |
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Affiliation: | a Thin Film Laboratory, Department of Physics, University of Pune, Pune 411007, India b Department of Chemistry, Mahatma Phule College, Pimpari, Pune 411017, India c Nanocrystalline Materials Laboratory, Center for Materials for Electronics Technology (CMET), Pune 411008, India d Center for Sensor Studies, Department of Physics, University of Pune, Pune 411007, India |
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Abstract: | Electrical and gas sensing properties of nanocrystalline ZnO:Cu, having Cu X wt% (X = 0.0, 0.5, 1.0, and 1.5) in ZnO, in the form of pellet were investigated. Copper chloride and zinc acetate were used as precursors along with oxalic acid as a precipitating reagent in methanol. Material characterization was done by X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and inductive coupled plasma with optical emission spectrometry (ICP-OES). FE-SEM showed the self-aligned Cu-doped ZnO nano-clusters with particles in the range of 40-45 nm. The doping of 0.5% of copper changes the electrical conductivity by an order of magnitude whereas the temperature coefficient of resistance (TCR) reduces with increase in copper wt% in ZnO. The material has shown an excellent sensitivity for the H2, LPG and CO gases with limited temperature selectivity through the optimized operating temperature of 130, 190 and 220 °C for H2, LPG and CO gases, respectively at 625 ppm gas concentration. The %SF was observed to be 1460 for H2 at 1% Cu doping whereas the 0.5% Cu doping offered %SF of 950 and 520 for CO and LPG, respectively. The response and recovery time was found to be 6 to 8 s and 16 s, respectively. |
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Keywords: | A. Semiconductors Nanostructures Electronic materials B. Chemical synthesis D. Electrical properties |
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