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A High Sensitivity Isopropanol Vapor Sensor Based on Cr2O3–SnO2 Heterojunction Nanocomposites via Chemical Precipitation Route

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Cr2O3–SnO2 heterojunction nanocomposites were prepared via chemical precipitation method. The prepared samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra and Field Emission Electron Microscopy (FESEM). The XRD spectrum confirms the presence of both tetragonal rutile SnO2 and rhombohedral corundum Cr2O3 structure. Further investigation into the gas sensing performances of the prepared Cr2O3–SnO2 nanocomposites exhibited an enhanced sensitivity towards VOPs such as isopropanol, acetone, ethanol and formaldehyde. Especially, isopropanol vapor sensor shows excellent sensitivity at an operating temperature of 100 °C. The highest sensitivity for Cr2O3–SnO2 heterojunction nanocomposites indicate that these materials can be a good candidate for the production of high-performance isopropanol sensors.
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Keywords: Gas Sensors; Heterostructure; Metal Oxide Nanocomposites; VOPs

Document Type: Research Article

Affiliations: 1: Department of Physics, B.S. Abdur Rahman Crescent University, Chennai 600048, Tamil Nadu, India 2: Department of Physics, Ramakrishna Mission Vivekananda College (Autonomous), Chennai 600004, India 3: Department of Physics, Government Arts College for Men, Krishnagiri 635001, India 4: Department of Physics, Vellore Institute of Technology-Andhra Pradesh University, Amaravati Campus, Guntur 522501, Andhra Pradesh, India 5: Department of Physics, National Institute of Technology, Tiruchirappalli 620015, India 6: Department of Physics, Loyola College, Chennai 600034, Tamil Nadu, India

Publication date: 01 August 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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