Improvement in ammonia gas sensing behavior by polypyrrole/multi-walled carbon nanotubes composites

Jang, Woo Kyung; Yun, Jumi; Kim, Hyung-Il; Lee, Young-Seak

doi:10.5714/cl.2012.13.2.088

Cited by 34 publications

(9 citation statements)

References 35 publications

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“…The immediately dangerous to life or health concentration (IDLH) towards NH 3 is 300 ppm [13][14][15][16]. When the human body is in the low concentration of NH 3 environment such as 35 ppm for a long time, it will also cause the increase of blood ammonia concentration, which will lead to a serious of pathological changes of organs such as liver and kidney [14,17,18]. Therefore, it is very important to develop a new NH 3 gas sensor with high response and selectivity.…”

Section: Introductionmentioning

confidence: 99%

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

Zhou

Zhao

et al. 2021

Vacuum

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WO 3 •0.33H 2 O microshuttles (WMSs) self-assembled by numerous nanorods along the same direction were prepared based on a cheap tungsten-containing metallurgical raw material by combination processes of NaOH leaching and one-step hydrothermal method. The microstructures and gas sensing properties of various concentrations (0, 0.7, 1.0, and 1.3 mol%) of Pt-doped WMSs were investigated to improve their performance. The microstructural characterizations demonstrated that the WMSs assembled by one-dimensional WO 3 •0.33H 2 O nanorods were approximately 0.8−1.9 µm in diameter. Such nanorods exhibited a single hexagonal structure with their diameters ranging from 17 to 62 nm. The gas sensing properties indicated that Pt-doped WMSs showed superior gas sensing performance in terms of the sensor response and NH 3 selectivity in the operating temperature range of 25−225 o C as compared with pure one, and simultaneously Pt doping could signi cantly reduce the detection limit of NH 3. Especially, 1.0 mol% Pt-doped WMSs exhibited highest response of 28.2 to 1000 ppm NH 3 at 175 o C, which was 4 times higher than pure one at 50 o C. The remarkably enhanced gas sensing performance of Pt-doped WMSs to NH 3 could be ascribed to the electronic and chemical sensitization mechanisms of noble metal nanoparticles.

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Section: Introductionmentioning

confidence: 99%

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

Zhou

Zhao

et al. 2021

Vacuum

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“…It was shown that a polypyrrole carbon nanotube (PPy-CNTs) composite exhibits very different electronic properties compared to the sole composites of PPy and CNTs. Furthermore, composite films of CNTs with polypyrrole are well suited for gas sensor applications [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Ferulic Acid Using Polypyrrole-Multiwalled Carbon Nanotubes Modified Electrode with Sample Application

Abdel-Hamid

Newair

2015

Nanomaterials

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Abstract:A polypyrrole-multiwalled carbon nanotubes modified glassy carbon electrode-based sensor was devised for determination of ferulic acid (FA). The fabricated sensor was prepared electrochemically using cyclic voltammetry (CV) and characterized using CV and scanning electron microscope (SEM). The electrode shows an excellent electrochemical catalytic activity towards FA oxidation. Under optimal conditions, the anodic peak current correlates linearly to the FA concentration throughout the range of 3.32 × 10 M (S/N = 3). The prepared sensor is highly selective towards ferulic acid without the interference of ascorbic acid. The sensor applicability was tested for total content determination of FA in a commercial popcorn sample and showed a robust functionality.

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“…The composite was used to detect ammonia vapours in the concentration range of 1-30 ppm, and the maximum response was calculated to be 46.44% at 5 ppm. A PPy/MWCNTs nanocomposite was fabricated by Jang et al 39 using the in-situ polymerization method. They used this composite for sensing ammonia vapours at temperatures ranging from room temperature to 100°C and calculated the sensitivity to be 65%.…”

Section: Ammonia Vapour Sensingmentioning

confidence: 99%

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

Shariq

Husain

Khan

et al. 2021

Polymers and Polymer Composites

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In this study, polypyrrole (PPy) and polypyrrole/molybdenum oxide composite (PPy/MoO3) were synthesized by the chemical oxidative method in an aqueous medium, using anhydrous ferric chloride (FeCl3) as an oxidant. The successful preparation of materials was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmittance electron microscopy (TEM). PPy and PPy/MoO3 were converted into pellets which were used as the sensor. A four-in-line probe device was used for studying DC electrical conductivity–based ammonia vapour–sensing properties at three different ammonia concentrations, that is, 1 M, 0.5 M and 0.1 M. The PPy/MoO3 sensor showed much-improved sensing performance than the PPy sensor in terms of % sensing response and reversibility. PPy/MoO3 sensor showed excellent selectivity for ammonia vapours against various VOCs. The % sensing response of PPy/MoO3 sensor towards ammonia was found to be 2.19, 2.50, 3.16, 3.87, 4.1, 5.15, 6.19, 6.55 and 7.77 times greater than ethanol, methanol, acetone, acetaldehyde, formaldehyde, toluene, benzene, chloroform and n-hexane, respectively. In the end, a sensing mechanism was also proposed, which is based on rapid adsorption–desorption of ammonia molecules on the PPy/MoO3 sensor’s surface.

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Improvement in ammonia gas sensing behavior by polypyrrole/multi-walled carbon nanotubes composites

Cited by 34 publications

References 35 publications

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

NH3 sensing performance of Pt-doped WO3·0.33H2O microshuttles induced from scheelite leaching solution

Voltammetric Determination of Ferulic Acid Using Polypyrrole-Multiwalled Carbon Nanotubes Modified Electrode with Sample Application

Synthesis and characterization of polypyrrole/molybdenum oxide composite for ammonia vapour sensing at room temperature

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