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Semiconductor metal oxide compounds based gas sensors： A literature review

Frontiers of Materials Science 2015年第1期9卷 14-37页

作者： Sunil Jagannath PATIL Arun Vithal PATIL Chandrakant Govindrao DIGHAVKAR Kashinath Shravan THAKARE Ratan Yadav BORASE Sachin Jayaram NANDRE nishad gopal deshpande Rajendra Ramdas AHIRE Department of Physics S. G. Patil Arts Science & Commerce College Sakri-424304 Dist. Dhule India Department of Physics L. V. H. College Panchavati Nashik-422003 India Thin and Thick film Laboratory M. S. G. College Malegaon Camp Malegaon-423105 Dist. Nashik India Department of Physics Uttamrao Patil College Dahivel Dist-Dhule India Department of Physics Shivaji University Kolhapur-416004 India

This paper gives a statistical view about important contributions and advances on semiconductor metal oxide （SMO） compounds based gas sensors developed to detect the air pollutants such as liquefied petroleum gas （LPG）, H2S, NH3, CO2, acetone, ethanol, other volatile compounds and hazardous gases. Moreover, it is revealed that the alloy/composite made up of SMO gas sensors show better gas response than their counterpart single component gas sensors, i.e., they are found to enhance the 4S characteristics namely speed, sensitivity, selectivity and stability. Improvement of such types of sensors used for detection of various air pollutants, which are reported in last two decades, is highlighted herein.

关键词： gas sensor semiconductor metal oxide (SMO) sensitivity air pollutant gas response

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Influence of Thickness on the Photosensing Properties of Chemically Synthesized Copper Sulfide Thin Films

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World Journal of Condensed Matter Physics 2015年第1期5卷 1-9页

作者： Abhiman Dattatray Dhondge Sunil Rameshgir Gosavi Narayani Madhukar Gosavi Chatur Pundlik Sawant Amar Maruti Patil Abhijeet Ravsaheb Shelke nishad gopal deshpande C. H. C. Arts S. G. P. Commerce and B. B. J. P. Science College Taloda India Government College of Engineering Jalgaon India G. T. Patil College Nandurbar India q-SpinTech & Nanomaterials Laboratory Department of Physics Shivaji University Kolhapur India

We report here the influence of thickness on the photosensing properties of copper sulfide (CuS) thin films. The CuS films were deposited onto glass substrate by using a simple and cost effective chemical bath deposition method. The changes in film thickness as a function of time were monitored. The films were characterized using X-ray diffraction technique (XRD), field emission scanning electron microscopy (FE-SEM), optical measurement techniques and electrical measurement. X-ray diffraction results indicate that all the CuS thin films have an orthorhombic (covellite) structure with preferential orientation along (113) direction. The intensity of the diffraction peaks increases as thickness of the film increases. Uniform deposition having nanocrystalline granular morphology distributed over the entire glass substrate was observed through FE-SEM studies. The crystalline and surface properties of the CuS thin films improved with increase in the film thickness. Transmittance (except for 210 nm thick CuS film) together with band gap values was found to decrease with increase in thickness. I-V measurements under dark and illumination condition show that the CuS thin films give a good photoresponse.

关键词： Copper Sulfide (CuS) Chemical Bath Deposition (CBD) Thin Film X-Ray Diffraction (XRD) Field Emission Scanning Electron Microscopy (FESEM) Photosensitivity

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