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1. Ethanol Sensing Properties of Nanocrystalline α-MoO3

Author

Sucheta Sau, Sonam Chakraborty, Tanushri Das, and Mrinal Pal

Subjects
α−MoO3, nanoparticles, sol-gel, ethanol vapor, sensitivity, Technology
Abstract

Ethanol sensors with effective and selective sensitivity are extensively used by traffic police to detect drunken drivers, in wine industries for controlling the fermentation process, food package testing, different medical applications etc. Orthorhombic phase pure α−MoO3 nanoparticles were synthesized via facile sol-gel technique to ethanol sensor. It was observed that the gas sensing response of the sample toward 100 ppm of ethanol vapor is 59% at 350 °C. The response and the recovery time of the gas sensor toward 100 ppm ethanol vapor are found to be 34 s and 70 s, respectively. The main obstacle for a gas sensor to be an excellent breath analyser is to remain insensitive toward the main interfering agent of exhaling human breath i.e. moisture. Prepared sensor is highly selective and shows almost no response toward saturated moisture.

Published
2019
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2. Microporous copper chromite thick film based novel and ultrasensitive capacitive humidity sensor

Author

Tanushri Das, Partha Pratim Mondal, Preeti Lata Mahapatra, Sagnik Das, Mrinal Pal, and Debdulal Saha

Subjects
Materials science, Mechanical Engineering, Capacitive sensing, Metals and Alloys, chemistry.chemical_element, Copper chromite, 02 engineering and technology, Microporous material, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Copper, Capacitance, 0104 chemical sciences, Contact angle, chemistry.chemical_compound, symbols.namesake, chemistry, Mechanics of Materials, Materials Chemistry, symbols, Composite material, 0210 nano-technology, Raman spectroscopy, Susceptance
Abstract

In this paper we report to have developed a microporous Copper Chromite (CuCr2O4) thick film based capacitive humidity sensor that exhibits excellent response in the range of 1%–98% RH at room temperature. CuCr2O4 spinel nanopowder was synthesized by a facile sol-gel technique. The as prepared CuCr2O4 nanopowder was screen printed to develop a thick film and it was sandwiched between two parallel electrodes of silver and copper to develop a parallel plate capacitive sensor. The CuCr2O4 nanoparticles and the thick film were well characterized by XRD, XPS, FTIR spectroscopy, Raman Spectroscopy, FESEM, TEM, EDX, and contact angle measurement. Various electrical parameters of the sensor, viz. Capacitance (Cp), Dissipation (D), Conductance (Gp), Susceptance (Bp), and admittance (Y) were measured at different frequencies ranging from 100 Hz to 1 MHz. It was observed that the optimum operating frequency is 1 kHz. At this frequency the sensor exhibited very high sensitivity, especially in the low %RH range of 1%–40% (∼640 pF change in capacitance), low dissipation loss (

Published
2021
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