Pawan Kumar; Amit Sanger; Arvind Kumar; Davinder Kaur; Ramesh Chandra
Abstract
In the present work, gas sensing properties of Copper (Cu) doped Zinc Oxide (ZnO) thin films have been investigated. The nanostructured ZnO and Cu doped ZnO (CZO) thin films have been synthesized using DC magnetron sputtering on glass substrates. The effect of hydrophobicity and surface roughness of ...
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In the present work, gas sensing properties of Copper (Cu) doped Zinc Oxide (ZnO) thin films have been investigated. The nanostructured ZnO and Cu doped ZnO (CZO) thin films have been synthesized using DC magnetron sputtering on glass substrates. The effect of hydrophobicity and surface roughness of the CZO thin films on the carbon monoxide (CO) gas sensing performance have been examined. Fast response time (47 sec) and an optimum recovery time (~ 86 sec) have been witnessed at an adequate temperature of 250°C for the samples having contact angle ~ 131o and surface roughness ~ 14.86 nm. Hydrophobicity of the surface provides short recovery time by opposing the existence of water-vapour on the surface. Copyright © 2018 VBRI Press.
Anupma Sharma; Vijay Kumar; Saurav Kumar; Pooja D; Sudeshna Bagchi; Amol P. Bhondekar
Abstract
In this work, we present the first investigations of Mn3O4 nanoparticles doped in polyaniline (PANI) matrix for gas sensing application. PANI/Mn3O4 nanocomposite (NC) was synthesized by facile one step reduction method with varied dopant concentrations (1mM and 3mM) of synthesized Mn3O4 nanoparticles ...
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In this work, we present the first investigations of Mn3O4 nanoparticles doped in polyaniline (PANI) matrix for gas sensing application. PANI/Mn3O4 nanocomposite (NC) was synthesized by facile one step reduction method with varied dopant concentrations (1mM and 3mM) of synthesized Mn3O4 nanoparticles followed by its characterization for optical, structural, morphological, thermal and electrical properties. Optical characterization by UV-Vis and FT-IR confirmed the doping of Mn3O4 in polymer matrix. TGA analysis showed improvement in the thermal stability of the NC. SEM images portrayed agglomerated morphology of PANI whereas the NC depicted fibre-like structures symptomatic of more porosity. Gas sensing behavior was investigated towards acetone, ethanol and benzaldehyde vapours. The sensor with 3mM dopant concentration exhibited significant sensing response with a sensitivity of 1.5 at room temperature towards acetone vapour, which can be attributed to the controlled and improved properties at the interface via molecular and supramolecular interactions. The synthesized NC has a potential use as acetone sensor with fast response and recovery. Copyright © 2017 VBRI Press
Hemlata J. Sharma; Megha A. Salorkar; Subhash B. Kondawar
Abstract
Electrospun nanofibers of Polyaniline (PANI)/SnO2 composite based gas sensor for hydrogen (H2) and carbon monoxide (CO) gas were prepared by electrospinning technique. The synthesized material was characterized using UV-Visible, XRD and SEM-EDX analyses. The average diameter of PANI/SnO2 composite was ...
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Electrospun nanofibers of Polyaniline (PANI)/SnO2 composite based gas sensor for hydrogen (H2) and carbon monoxide (CO) gas were prepared by electrospinning technique. The synthesized material was characterized using UV-Visible, XRD and SEM-EDX analyses. The average diameter of PANI/SnO2 composite was found to be high as compared to that of pristine SnO2 nanofibers having 200 nm diameter may be due to micelle formation of PANI on the surface of SnO2 nanofibers.The enhanced sensing properties in the form of sensitivity factor, time taken to response and recovery during exposure and de-exposure of Gas and repeatability were studied. The SnO2/PANI composite nanofibers showed high sensitivity and response to H2 gas compared to CO gas to 0.1% and maximum sensitivity was observed at 35˚C for H2 gas. Fast Response-Recovery Time for 1000-5000 ppm of H2 i.e. less than 30 secs were observed. Due to room temperature operation of the sensor, it is promising for environmental applications. The results indicate that aligned SnO2/PANI composite fibers are promising candidate for fast detection of H2 gas. Copyright © 2017 VBRI Press.
