Experimental investigations on NO<sub>2</sub> sensing of pure ZnO and PANI–ZnO composite thin films

Sonker, Rakesh K.; Yadav, B. C.; Sharma, Anjali; Tomar, Monika; Gupta, Vinay

doi:10.1039/c6ra07103a

Cited by 77 publications

(36 citation statements)

References 33 publications

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“…However, the increase in recovery time may be caused by gas type which is left following later than the gas communication in the decrease in desorption speed and therefore recovery time increase as NO 2 gas concentration also increases. 40…”

Section: Results and Discussionmentioning

confidence: 99%

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

et al. 2019

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A simple one-step chemical method is employed for the successful synthesis of CuO(50%)–ZnO(50%) nanocomposites (NCs) and investigation of their gas sensing properties. The X-ray diffraction studies revealed that these CuO–ZnO NCs display a hexagonal wurtzite-type crystal structure. The average width of 50–100 nm and length of 200–600 nm of the NCs were confirmed by transmission electron microscopic images, and the 1:1 proportion of Cu and Zn composition was confirmed by energy-dispersive spectra, i.e., CuO(50%)–ZnO(50%) NC studies. The CuO(50%)–ZnO(50%) NCs exhibit superior gas sensing performance with outstanding selectivity toward NO2 gas at a working temperature of 200 °C. Moreover, these NCs were used for the indirect evaluation of NO2 via electrochemical detection of NO2– (as NO2 converts into NO2– once it reacts with moisture, resulting into acid rain, i.e., indirect evaluation of NO2). As compared with other known modified electrodes, CuO(50%)–ZnO(50%) NCs show an apparent oxidation of NO2– with a larger peak current for a wider linear range of nitrite concentration from 20 to 100 mM. We thus demonstrate that the as-synthesized CuO(50%)–ZnO(50%) NCs act as a promising low-cost NO2 sensor and further confirm their potential toward tunable gas sensors (electrochemical and solid state) (Scheme 1).

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Section: Results and Discussionmentioning

confidence: 99%

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

et al. 2019

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“…It was seen, that the absorption edge of ZnO/PANI has shifted towards UV region compared to ZnO nanorods. It points the charge transfer from PANI to ZnO in formed ZnO/PANI nanocomposites [16]. In addition, two absorption edges appeared in ZnO/PANI spectra in the range of 470 and 700 nm.…”

Section: Photoluminescence Measurementsmentioning

confidence: 75%

“…The XRD peaks point the forming of crystalline conductive PANI in the form of emeraldine salt [15]. Peaks of ZnO at 55.88, 60.2 and 64.88 are shifted due to forming of ZnO/PANI composite structure [16].…”

Section: Structural Properties Of Zno-pani Nanocompositesmentioning

confidence: 98%

ZnO/polyaniline composite based photoluminescence sensor for the determination of acetic acid vapor

Turemis

Zappi

Giardi

et al. 2020

Talanta

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In this study, we report a novel ZnO/polyaniline (PANI) nanocomposite optical gas sensor for the determination of acetic acid at room temperatures. ZnO nanorods, synthesized in powder form were coated by PANI (ZnO/ PANI) by chemical polymerization method. The obtained nanocomposites were deposited on glass substrate and dried overnight at room temperature. Structure and optical properties of ZnO/PANI nanocomposite have been studied by using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, diffuse reflectance and photoluminescence spectroscopy. Tests towards acetic acids were performed in the range of concentrations 1-13 ppm. The adsorption of acetic acid on the sensor's surface resulted in the decrease of ZnO/ PANI photoluminescence. The response and recovery time of the sensor were in the range of 30-50 s and 5 min, respectively. The developed sensors showed sensitivity towards acetic acid in a range of 1-10 ppm with the limit of detection of 1.2 ppm. Specially designed miniaturized sensing system based on integrated sensing layer, light emission diode as excitation source and optical fiber spectrometer was developed for the measurement of the sensor signal. The developed sensing system was applied for the investigation of some real sample assessment including the evaluation of storage conditions of ancient cellulose acetate films, which during the degradation are releasing acetic acid. The obtained results suggest that the developed novel optical ZnO/PANI nanocompsite based sensor shows great potential for acetic acid determination in various samples.

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“…By the addition of ZnO, the vibrational peak shifted to 1163 cm −1 (CO stretch) in PRZ with a strong appearance. Also, the FTIR spectrum of PRZ shows vibrational bands below 600 cm −1 corresponds to the characteristic peak of ZnO bond 37,38 …”

Section: Resultsmentioning

confidence: 99%

“…Also, the FTIR spectrum of PRZ shows vibrational bands below 600 cm −1 corresponds to the characteristic peak of Zn O bond. 37,38 F I G U R E 1 (a) XRD patterns of PANI, ZnO, PR, and PRZ; (b) Raman spectra of PANI-rGO-ZnO (PRZ). PANI, polyaniline; PR, polyaniline/ rGO; PRZ, polyaniline-rGO-ZnO; XRD, X-ray diffraction [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Xrd and Raman Studiesmentioning

confidence: 99%

Electrosynthesis of polyaniline‐based composite films and their electrochemical activity

Bumika

Mallick

Palai

et al. 2020

J of Applied Polymer Sci

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Herein, we report the synthesis of organic-inorganic hybrids of polyaniline-rGO-ZnO (PRZ) ternary composite materials for a potential application in dyesensitized solar cell (DSSC). A facile all-electrochemical method was adopted for the deposition of PRZ films on FTO-coated glass substrate. The PRZ hybrid assembly was subsequently characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), cyclic voltammetry, and photoelectrochemical measurements. Further, the morphological and elemental composition features of PRZ were monitored by field emission SEM and EDX, respectively. Electrochemical impedance spectra suggest that the chargetransfer resistance for the ternary composite is distinctly decreased. The maximum conversion efficiency of DSSC with PRZ counter electrode reaches 2.84%, which is higher than that of polyaniline-reduced graphene oxide (rGO) counter electrode. This ternary composite (PRZ) with organic-inorganic hybrid architecture showing an enhanced photoelectrochemical activity might be exploited in future as a promising material for application in next-generation solar devices.

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Experimental investigations on NO₂ sensing of pure ZnO and PANI–ZnO composite thin films

Abstract: In the present work, comparative investigations on NO2 gas sensing properties of the hybrid nanocomposite thin films of polyaniline (PANI), ZnO and PANI–ZnO towards NO2 gas at room temperature have been reported.

Cited by 77 publications

References 33 publications

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

ZnO/polyaniline composite based photoluminescence sensor for the determination of acetic acid vapor

Electrosynthesis of polyaniline‐based composite films and their electrochemical activity

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Experimental investigations on NO2 sensing of pure ZnO and PANI–ZnO composite thin films

Abstract: In the present work, comparative investigations on NO2 gas sensing properties of the hybrid nanocomposite thin films of polyaniline (PANI), ZnO and PANI–ZnO towards NO2 gas at room temperature have been reported.

Cited by 77 publications

References 33 publications

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO2 Sensor

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO2 Sensor

ZnO/polyaniline composite based photoluminescence sensor for the determination of acetic acid vapor

Electrosynthesis of polyaniline‐based composite films and their electrochemical activity

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Product

Resources

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Experimental investigations on NO₂ sensing of pure ZnO and PANI–ZnO composite thin films

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor