High acetic acid sensing performance of Mg-doped ZnO/rGO nanocomposites

Khorramshahi, Vahid; Karamdel, Javad; Yousefi, Ramin

doi:10.1016/j.ceramint.2018.12.205

Cited by 47 publications

(15 citation statements)

References 69 publications

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“…The developed ZnO/PANI-based sensors showed good sensitivity comparing to ZnO-based gas sensors, based on resistive metal oxide nanostructures [6,7,29]. As published in Refs.…”

Section: Real Sample Analysismentioning

confidence: 83%

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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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“…The developed ZnO/PANI-based sensors showed good sensitivity comparing to ZnO-based gas sensors, based on resistive metal oxide nanostructures [6,7,29]. As published in Refs.…”

Section: Real Sample Analysismentioning

confidence: 83%

“…As published in Refs. [6,7,29], the resistive sensors has wide working range with fast response and recovery time Table 2. Fast recovery in resistive type acetic acid gas sensor can be attributed their high operating temperatures.…”

Section: Real Sample Analysismentioning

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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“…The PL spectra of the PZNF sample show similar profiles and temperature-dependences to those of the ZNF sample, but also two clear differences: (1) The ratio of the peak intensities of the visible band and UV emissions (I visible /I UV ) from the PZNF sample at any given temperature is much smaller than that from the ZNF sample, implying that the ZnO in the PZNF sample has a higher crystalline quality and thus a higher UV emission efficiency; A sample temperature of 115 °C is too low to cause any substantial reduction of defects in the inner (bulk) part of the crystallites but could have a substantial influence on surface defects related to the physical and chemical adsorption of gaseous species. Thus, it is rational to conclude that the ZnO in the ZNF sample has relatively poorer crystalline quality with some oxygen-rich-related defects located inside the crystallites, while the ZnO in the PZNF sample has higher crystalline quality and contains a higher density of oxygen-deficiency-related defects at the crystallite 9 surfaces and interfaceswhich are beneficial to the adsorption of oxygen species and thus improve the sensing performance of such gas sensors [49]. The T-dependent PL properties of the PZNF sample can be understood if the surfaces and interfaces of the ZnO nanocrystallites are Pr-rich, and the smaller average crystallite size facilitates higher crystalline quality via the calcination process.…”

Section: Resultsmentioning

confidence: 99%

High-performance photoluminescence-based oxygen sensing with Pr-modified ZnO nanofibers

Jiang

Zhang

et al. 2019

Applied Surface Science

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Praseodymium (Pr)-modified zinc oxide (ZnO) nanofibers have been fabricated using an electrospinning-calcination method. These Pr-modified ZnO nanofibers present porous morphologies containing numerous ZnO nanocrystallites with average sizes that are much smaller than those found in pure ZnO nanofibers formed by the same procedures. Most Pr is identified at the surface of / interface between the nanocrystallites. In addition to the morphological modifications, addition of Pr is also shown to enhance the crystalline quality of the ZnO.Consequently, the Pr-modified ZnO nanofibers have a higher UV emission efficiency and exhibit a much-enhanced UV emission-based O 2 sensing performance than the pure ZnO nanofibers. By way of illustration, the Pr-modified nanofibers show O 2 sensing responses of R = 39% at room temperature and R = 71% at 115 °C (cf. R = 19% and 52% with the pure ZnO nanofibers at these same operating temperatures). These results suggest that electrospun Pr-modified ZnO nanofibers hold real promise for high-performance optical gas sensing applications.

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“…The excellent sensitivity and improved selectivity of the 4HQ-rGO/Cu 2+ based sensors toward acetic acid could be explained by the band theory. 43,44 The oxygen molecules were absorbed onto the surface of the graphene sheets aer exposure to air atmosphere. The absorbed molecules then captured electrons from the conduction band of the graphene sheets to create an electron depletion layer (O 2 À or O À ).…”

Section: Resultsmentioning

confidence: 99%

“…18 So far, only a few studies on graphene-based acetic acid sensors have been reported. [19][20][21][22] As stated above, it is important to nd a protocol to decrease the working temperature of the gas sensors. It is known that many transition metals, such as V, Fe, Cr, and Cu, show good catalytic properties under a low temperature, [23][24][25][26][27] which implies the possibility of enhancing the charge transfer at low temperatures during the gas sensing process.…”

Section: Introductionmentioning

confidence: 99%

Assembly with copper(ii) ions and D–π–A molecules on a graphene surface for ultra-fast acetic acid sensing at room temperature

Gong

Pei

et al. 2019

RSC Adv.

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High acetic acid sensing performance of Mg-doped ZnO/rGO nanocomposites

Cited by 47 publications

References 69 publications

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

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

High-performance photoluminescence-based oxygen sensing with Pr-modified ZnO nanofibers

Assembly with copper(ii) ions and D–π–A molecules on a graphene surface for ultra-fast acetic acid sensing at room temperature

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