An all-solid-state potentiometric SO2 gas sensor with solid reference electrode

Kumar, Rupesh

doi:10.1007/bf02376586

Cited by 7 publications

(3 citation statements)

References 31 publications

(29 reference statements)

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“…These detection units have the advantage of stand‐alone operation and low level detection, but they are very expensive, time consuming and too large in size to install on every emitting site. SO 2 is also detected by sensors based on electrochemical analysis, chemiresistors, potentiometric analysis, quartz crystal microbalance (QCM), surface acoustic waves (SAW) and field effect transistors (FET) . Electrochemical and potentiometric sensors have short lives, whereas SAW, QCM and FET based sensors are expensive or require special fabrication with sophisticated measuring equipment.…”

Section: Introductionmentioning

confidence: 99%

Solitary surfactant assisted morphology dependent chemiresistive polyaniline sensors for room temperature monitoring of low parts per million sulfur dioxide

Chaudhary

Kaur

2015

Polymer International

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We report the novel application of cetryltrimethylammonium bromide (CTAB) assisted polyaniline (PAN) nanostructures to fabricate cost effective chemiresistive sensors for monitoring a low parts per million level of sulfur dioxide (SO2) at room temperature. PAN nanoparticles (NPs, diameter ca 200 nm), nanofibres (NFs, diameter ca 100 nm) and nanoneedles (NNs, diameter ca 50 nm) were synthesized via template‐directed chemical oxidative polymerization of aniline by varying concentration of the solitary cationic surfactant CTAB (from 5 mmol L−1 to 15 mmol L−1). It was observed that the PAN NN based sensing device showed an excellent sensing response (ca 4.2%) towards a low concentration of SO2 (10 ppm) compared to the device based on PAN NFs (ca 3%) and PAN NPs (ca 1.2%) at room temperature. The PAN NN based sensing device was also found to be efficient in terms of stability, selectivity, reproducibility, recovery and response time, and detection range. The mechanism of SO2 sensing has been explored for the first time by using in situ Fourier transform infrared spectroscopy. © 2015 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Solitary surfactant assisted morphology dependent chemiresistive polyaniline sensors for room temperature monitoring of low parts per million sulfur dioxide

Chaudhary

Kaur

2015

Polymer International

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“…Thus, sample F 2 is found to be optimized as a high‐performance, room temperature, stable, energy saving and environmentally friendly chemiresistor for SO 2 sensing application. Furthermore, the sensing response of the fabricated sensor F 2 towards SO 2 is also found to be enhanced as compared to reports in the literature . The sensing behaviour, i.e.…”

Section: Resultsmentioning

confidence: 49%

“…The exposure limit for sulfur oxides is 5 ppm, beyond which they can adversely affect the human respiratory and nervous systems, and can cause permanent pulmonary impairment, skin infections and in worst cases death due to lung failure . The commercially available sensors for detection of SO x include optical sensors, potentiometric sensors, chemiresistive‐type sensors, acoustic sensors and transistors . The chemiresistors are the most cost effective, energy saving and environmental friendly types of sensors amongst all the sensing technologies .…”

Section: Introductionmentioning

confidence: 99%

Effect of charge carrier transport on sulfur dioxide monitoring performance of highly porous polyaniline nanofibres

2017

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Polyaniline nanofibres (NFs) with controlled diameters were synthesized using a template-free method, with ammonium peroxidisulfate (APS) or ferric chloride (FeCl 3 ) as oxidants. Porosity studies reveal that NFs prepared with FeCl 3 possess higher effective surface area and larger pore volume compared to NFs prepared with APS. The FeCl 3 -assisted NFs show around twofold enhanced sensing response (ca 4.5%) towards 5 ppm of SO 2 at room temperature compared to APS-assisted NFs (ca 2%). The enhancement can be attributed to the lower diameter, higher effective surface area and larger porosity of FeCl 3 -assisted NFs. To further explain this enhanced sensing response, the conduction mechanism was studied. NFs possessing a smaller diameter (ca 10 nm) are found to follow the one-dimensional variable range hopping (VRH) model, whereas NFs with larger diameter (ca 100 nm) follow the conventional three-dimensional VRH model. This can be due to the restriction of charge carrier transport into only one direction due to quantum size effects. Furthermore, the calculated Mott parameters suggest that the NFs prepared using FeCl 3 provide a better pathway for charge transport of charge carriers as compared to NFs prepared using APS in terms of shorter hopping distance, lower activation energy and lower hopping energy, and weaker localization of charge carriers.

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Electronic sensor for sulfide dioxide based on AlN nanotubes: a computational study

et al. 2012

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Single-walled aluminum nitride nanotubes (AlNNTs) are introduced as an electronic sensor for detection of sulfur dioxide (SO₂) molecules based on density functional theory calculations. The proposed sensor benefits from several advantages including high sensitivity: HOMO-LUMO energy gap of the AlNNT is appreciably sensitive toward the presence of SO₂ so that it decreases from 4.11 eV in the pristine tube to 1.01 eV in the SO₂-adsorbed form, pristine application: this nanotube can detect the SO₂ molecule in its pristine type without manipulating its structure through doping, chemical functionalization, making defect, etc., short recovery time: the adsorption energy of SO₂ molecule is not so large to hinder the recovery of AlNNTs and therefore the sensor will possess short recovery times, and good selectivity: the tube can selectively detect the SO₂ molecule in the presence of several molecules such as H₂O, CO, NH₃, HCOH, CO₂, N₂, and H₂.

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An all-solid-state potentiometric SO2 gas sensor with solid reference electrode

Cited by 7 publications

References 31 publications

Solitary surfactant assisted morphology dependent chemiresistive polyaniline sensors for room temperature monitoring of low parts per million sulfur dioxide

Solitary surfactant assisted morphology dependent chemiresistive polyaniline sensors for room temperature monitoring of low parts per million sulfur dioxide

Effect of charge carrier transport on sulfur dioxide monitoring performance of highly porous polyaniline nanofibres

Electronic sensor for sulfide dioxide based on AlN nanotubes: a computational study

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