Analysing Effect of Different Parameters on Performance of Dodecyl Benzene Sulphonic Acid Doped Polyaniline Based Ammonia Gas Sensor
01 Oct 2018-
TL;DR: In this paper, the development of Dodecyl benzene sulphonic acid (DBSA) doped polyaniline (PANI) nanoparticles based ammonia gas sensor is demonstrated.
Abstract: The paper demonstrates the development of Dodecyl benzene sulphonic acid (DBSA) doped polyaniline (PANI) nanoparticles based ammonia gas sensor. DBSA doped PANI nanoparticles have been synthesized by chemical oxidative polymerization of aniline monomer in the presence of DBSA. The UV - Visible spectroscopy and X-ray diffraction measurements are used to confirm the formation of PANI and its doping by DBSA, whereas SEM images are used to see the formation of nanoparticles of PANI. The chloroform dispersion of synthesized PANI-DBSA was spin coated over prefabricated interdigitated Pt patterned glass substrate to realize porous gas sensing active layer. The sensor displays good response at 100 ppm ammonia concentration and can repeatedly detect ammonia with relative response of 5.5. Besides, this sensor development, an analysis of sensor performance against temperature variations is done to check thermal stability of the sensor. Effect of thin film thickness variations on relative response of the sensor is also analyzed. The experiments have been carried out at different concentrations which show that when concentration increases relative response and recovery time increase and response time decreases.
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01 Dec 2019
TL;DR: In this article, a gas sensor based on PANI-DBSA/MWCNT nanocomposites was developed and characterized for ammonia gas, prolonged exposure of which results in many potential health hazards such as rapid skin irritation, olfactory fatigue, cellular destruction and tissue necrosis.
Abstract: Dodecyl benzene sulfonic acid (DBSA) doped polyaniline (PANI-DBSA) / multi-walled carbon nanotube (MWCNT) nanocomposites (PANI-DBSA/MWCNT) based gas sensor is prepared and characterized for ammonia gas, prolonged exposure of which results in many potential health hazards such as rapid skin irritation, olfactory fatigue, cellular destruction and tissue necrosis. Highly conducting dodecyl benzene sulfonic acid (DBSA) doped polyaniline (PANI-DBSA) / multi-walled carbon nanotube (MWCNT) nanocomposites were prepared by in-situ polymerization process. FESEM, TEM, XRD, and UV-visible measurements confirmed the formations of PANI-DBSA/MWCNT nanocomposites. Experimentally it is observed that thin film of PANI-DBSA/3wt.%MWCNT nanocomposites synthesized by indirect doping route provides better ammonia gas sensing response (2.65 at 100 PPM) as compared to thin film of nanostructured PANI-DBSA (1.25 at 100 PPM). The cross-selectivity results revealed that the developed sensor is highly selective to ammonia gas as compared to other gases.
Cites methods from "Analysing Effect of Different Param..."
...3 mol aqueous DBSA solution, stirring for 2 h, de-emulsification, and filtration [11]....
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...It was followed by filtration through Whatman 41 filter paper [11]....
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01 Dec 2019
TL;DR: In this paper, a detailed comparison between ammonia gas sensing, spectral, structural, and morphological properties of the dodecyl benzene sulphonic acid doped polyaniline (PANI-DBSA) nanostructures synthesized using a template free direct route using surfactant dopants as structure directing agents and using indirect route.
Abstract: Prolonged exposure of ammonia results in many potential health hazards for humans as it interacts immediately upon contact with available moisture in the eyes, skin, oral cavity, respiratory tract and particularly mucous surfaces, thereby, causes cellular destruction and tissue necrosis. In this paper, we report a detailed comparison between ammonia gas sensing, spectral, structural, and morphological properties of the dodecyl benzene sulphonic acid doped polyaniline (PANI-DBSA) nanostructures synthesized using a template free direct route using surfactant dopants as structure directing agents and using indirect route. Two different samples of PANI-DBSA nanostructures have been prepared via template free direct route (Nanostructured DBSA doped PANI has been prepared by emulsion polymerization of aniline in the presence of DBSA) and indirect doping route (Nanostructured DBSA doped PANI has been prepared via chemical oxidative polymerization of aniline monomer). Different characterizations revealed that the spectral, structural, morphological, and ammonia gas sensing properties of the synthesized PANI-DBSA nanostructures are highly dependent on the synthesis route. Thin film of nanostructured PANI-DBSA prepared using template free direct route exhibited better ammonia gas sensing response (7.97) as compared to thin film of nanostructured PANI-DBSA prepared using indirect doping (3.24) due to availability of large number of grain boundaries and higher doping levels.
Cites background or methods from "Analysing Effect of Different Param..."
...3 mol aqueous DBSA solution, stirring for 2 h, de-emulsification, and filtration [11]....
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...In the presence of the ammonia gas, the sensor’s resistance increases quickly and attains saturation due to increase in deprotonation/localization of polarons in the PANI-DBSA sensing layer with increasing adsorptions of NH3 gas molecules on its surface [11]....
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...The so obtained viscous solution of PANI-DBSA nanorods/nanofibers was spin coated onto glass substrate (with platinum patterned interdigitated electrodes) at 1200 RPM to realize thin film constituted of PANI-DBSA nanorods/nanofibers [11]....
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TL;DR: In this article, the effect of water vapour in CO sensing by using Pd doped SnO2 sensors realized in thick film technology was investigated, and the results of phenomenological and spectroscopic measurement techniques, all of them obtained under working conditions for sensors, were combined with modelling in order to derive conclusions able to be generalized to the field of metal oxide based gas sensors.
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"Analysing Effect of Different Param..." refers background in this paper
...Chemiresistor, a MEMS based gas sensor, using conducting polymers as sensing layer has been gaining popularity for ammonia gas detection due to its simple configuration, easy fabrication, cost effectiveness, miniaturization, and most importantly room temperature operation [6]–[12]....
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TL;DR: In this paper, a review of the physical and chemical mechanisms by which electrical conduction occurs in these materials is presented, and a new generation of chemical sensors, which are reviewed in this article.
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