NO2 gas sensing with SnO2–ZnO/PANI composite thick film fabricated from porous nanosolid

Xu, Hongyan; Chen, Xingqiao; Zhang, Jun; Wang, Jieqiang; Cao, Bingqiang; Cui, Deliang

doi:10.1016/j.snb.2012.09.060

Cited by 103 publications

(48 citation statements)

References 40 publications

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“…The best response of 75 was observed at an operating temperature of 225˝C by a composite sensor containing SnO 2 loaded with 20 wt% ZnO. In contrast to the SnO 2 -ZnO composites reported in this work and in the literature by Song et al [47], the composites prepared by Xu et al [49] did exhibit a significant gas responses towards NO 2 , although at a much higher concentration than investigated here.…”

Section: No 2 Sensingcontrasting

confidence: 74%

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Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

2016

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Abstract:A composite metal oxide semiconductor (MOS) sensor array based on tin dioxide (SNO 2 ) and zinc oxide (ZnO) has been fabricated using a straight forward mechanical mixing method. The array was characterized using X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy and X-ray diffraction. The array was evaluated against a number of environmentally important reducing and oxidizing gases across a range of operating temperatures (300-500˝C). The highest response achieved was against 100 ppm ethanol by the 50 wt% ZnO-50 wt% SnO 2 device, which exhibited a response of 109.1, a 4.5-fold increase with respect to the pure SnO 2 counterpart (which displayed a response of 24.4) and a 12.3-fold enhancement with respect to the pure ZnO counterpart (which was associated with a response of 8.9), towards the same concentration of the analyte. Cross sensitivity studies were also carried out against a variety of reducing gases at an operating temperature of 300˝C. The sensors array showed selectivity towards ethanol. The enhanced behaviour of the mixed oxide materials was influenced by junction effects, composition, the packing structure and the device microstructure. The results show that it is possible to tune the sensitivity and selectivity of a composite sensor, through a simple change in the composition of the composite.

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Section: No 2 Sensingcontrasting

confidence: 74%

“…Xu et al [49] reported the NO 2 gas sensing properties of SnO 2 -ZnO porous nano-solids produced via a solvothermal hot-press (SHP) method. When exposed to 35 ppm NO 2 , the composites were seen to exhibit enhanced responses compared to the pure SnO 2 porous nanosolid counterpart.…”

Section: No 2 Sensingmentioning

confidence: 99%

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

2016

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“…SnO 2 is generally well-known as a wide band gap n-type oxide semiconductor with a direct band gap of 3.6 eV [6,7]. It has been widely used for catalysts [8], lithium ion batteries [9] and transparent electrodes [10], especially in combustible and toxic gas detection devices (gas sensors) [11,12]. Previous reports have demonstrated that SnO 2 -based gas sensors exhibit good response to many toxic gases like H 2 S [13], CO [14] and volatile organic gas [15].…”

Section: Introductionmentioning

confidence: 99%

High triethylamine-sensing properties of NiO/SnO2 hollow sphere P–N heterojunction sensors

et al. 2015

Sensors and Actuators B: Chemical

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217

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“…Several studies explained the enhancement of the response magnitude of inorganic/inorganic or organic/inorganic nanocomposites based on p/n junction theory. They also claimed that the depletion layer established at the interface between ZnO and PANI might result in the decrease of the activation energy and enthalpy of physisorption for target gases, being conducive to better sensing [27]. The common idea is that the increase in the response magnitude of the composites should be due, more than to the increased specific surface area of nanostructures, to the formation of p/n junction between p-type HCl doped polyaniline thin film and n-type ZnO semiconductor.…”

Section: Evaluation Of Sensor Response Towards Acetic Acidmentioning

confidence: 99%

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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NO2 gas sensing with SnO2–ZnO/PANI composite thick film fabricated from porous nanosolid

Cited by 103 publications

References 40 publications

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

High triethylamine-sensing properties of NiO/SnO2 hollow sphere P–N heterojunction sensors

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

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