Facile Synthesis of ZnO–Reduced Graphene Oxide Nanocomposites for NO<sub>2</sub> Gas Sensing Applications

Kumar, Narendra; Srivastava, Arvind K.; Patel, H. S.; Gupta, Bipin Kumar; Varma, G. D.

doi:10.1002/ejic.201403172

Cited by 112 publications

(65 citation statements)

References 69 publications

(59 reference statements)

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“…The 530.8 eV peak is attributed to the lattice O while the other two components are related to C=O and C-O (sp 3 ) [39]. The assignments of the mentioned functional groups are in agreement with the literature [38,39].…”

Section: X-ray Photoelectron Spectroscopy (Xps) Analysissupporting

confidence: 89%

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

et al. 2020

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Thin films of nanocomposite of zinc oxide–reduced graphene oxide (ZnO-rGO) deposited on soda-lime glass substrates were prepared using ultrasonic spray pyrolysis (USP) at 460 °C. The preparation process does not use harsh acids and is environmentally friendly. The deposition period of 2, 3.5 and 5 min resulted in compact, uniform samples with thicknesses of 148, 250 and 365 nm, respectively. After performing structural, morphological, optical and electrical characterization of the prepared nanocomposite, an influence of the deposition time on the physical properties of the obtained films was determined. TEM analyses indicate that the ZnO-rGO nanocomposite presents ZnO nanoparticles anchored on graphene sheets, while XRD, X-ray Photoelectron Spectroscopy (XPS) and Raman results show the presence of a ZnO phase in the ZnO-rGO films. HR-SEM studies showed changes of the ZnO-rGO thin films morphology due to the incorporation of graphene into the ZnO films. Here, the particles of ZnO are similar to small grains of rice and graphene films have the appearance of a little “rose”. As the thickness of the film increases with deposition time, it reduces the structure of resistance of the nanocomposite thin films to 135 Ω. In addition, the optical transmission of the thin films in the visible region resulted affected. Here, we report a simple methodology for the preparation of ZnO-rGO nanocomposite thin films.

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Section: X-ray Photoelectron Spectroscopy (Xps) Analysissupporting

confidence: 89%

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

et al. 2020

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“…The use of suitable supports with high surface area can provide high loading, uniform dispersion, and keeping the size of ferrite nanoparticles. Graphene, the one–atom–thick two–dimensional (2D) layer of sp 2 –bonded carbon, has become the focus of considerable interest for this purpose due to its unique electronic properties and large specific surface area …”

Section: Introductionmentioning

confidence: 99%

Synthesis of graphene oxide supported copper–cobalt ferrite material functionalized by arginine amino acid as a new high–performance catalyst

Ghadari

Namazi

Aghazadeh

2017

Applied Organom Chemis

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A novel Cu 0.5 Co 0.5 Fe 2 O 4 @Arg-GO catalytic system was successfully prepared by immobilization of copper substituted cobalt ferrite nanoparticles on arginine-grafted graphene oxide nanosheets, in which ferrite moiety acts as an oxidation catalyst and arginine has the role of base catalyst. Also, arginine amino acid was used to modify the surface of graphene oxide nanosheets which the prepared support can improve dispersion and uniform loading of nanoparticles.The prepared nanocomposite was characterized by flame atomic absorption spectroscopy (FAAS), inductively coupled plasma optical emission spectrometer (ICP-OES), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), Raman spectroscopy, thermogravimetric analysis (TGA), x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis. The prepared Cu 0.5 Co 0.5 Fe 2 O 4 @Arg-GO nanocomposite was used as an efficient catalyst for one-pot tandem oxidative synthesis of 2-phenylbenzimidazole derivatives in good yields.

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“…Apparently, compared with previous reports, in terms of the NO 2 detection limit, except for the refs. and that have a detection limit of 50 ppb, the as‐prepared SnO 2 monolayer film has lower NO 2 detection limit than those of other reports. However, for other performances, such as response/recovery time, the as‐prepared SnO 2 monolayer film exhibited much shorter time than those of other references.…”

Section: Resultsmentioning

confidence: 63%

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film

Liu

Luo

et al. 2019

Adv Materials Inter

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It is, therefore, urgent to take actions to address this issue. To predict whether there is NO 2 gas in the surrounding environment, the effective detection technology was indispensable. So far, detection means for monitoring NO 2 gas can be classified as optical, [5][6][7] electrochemical, [8][9][10] and chemiresistive sensing [11][12][13] technology. However, regardless of using optical or electrochemical method, some drawbacks were inevitably encountered, including sophisticated and expensive apparatus, intricate sample treatment as well as the poor portability, which severely restricted their practical application in special occasions, such as in combustion and automotive monitoring systems. [14,15] Alternatively, by means of the merits of the low-cost, miniaturization, and easy integration, the chemiresistive-type sensing technology was thus a particular promising candidate for the realization of both on-site and real-time detection. Generally, thermal-activated and ultraviolet (UV)-light driven gas sensors stand for two complementary chemiresistivetype gas sensing technologies. [16,17] Even though the thermaldriven type provided high sensitivity with a rapid response/ recovery speed, it would suffer from high operating temperature. [18,19] Undesirably, maintaining high operating temperature during the gas sensing process undoubtedly leaded to the following issues. On the one hand, an explosive potential possibly occurred when sensors were exposed into flammable and explosive gases, such as H 2 , CO, CH 4 , and NO. On the other hand, the elevated temperature with a long time enabled the regrowth of grains, leading to the decrease of sensitivity and poor long-term stability. To avoid above issue, the low temperature NO 2 sensors are the ideal choice. At present, it can realize low temperature NO 2 sensing by the UV-light activation or without the presence of the UV-light irradiation. However, for the case of the absence of the UV-light activation, the NO 2 sensors usually show the very slow response/recovery speed, [20][21][22][23][24] which is bad for the practical detection application. Alternatively, the emergence of UV-light illuminated mode can effectively avoid above shortcomings, because it offers a very low working temperature and fast response/recovery speed. To date, the related researches about UV-light irradiated gas sensors have been appeared. For example, Jiang et al. used polyporous SnO 2 -ZnO composites as sensors to detect the formaldehyde gas under the Chemiresistive-type gas sensors, which are driven by the thermal activation, have exhibited extraordinary promise for the detection of air pollutions, such as highly toxic gas of nitrogen dioxide (NO 2 ), but are often limited to its high operating temperature, because of the raising explosive risk in inflammable gases. This study reports the construction of a close-packed SnO 2 monolayer film, and uses it as the NO 2 room-temperature sensing layer induced by ultraviolet (UV)-light irradiation. Such SnO 2 monolayer array film shows excellent s...

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Facile Synthesis of ZnO–Reduced Graphene Oxide Nanocomposites for NO₂ Gas Sensing Applications

Cited by 112 publications

References 69 publications

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

Synthesis of graphene oxide supported copper–cobalt ferrite material functionalized by arginine amino acid as a new high–performance catalyst

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film

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Facile Synthesis of ZnO–Reduced Graphene Oxide Nanocomposites for NO2 Gas Sensing Applications

Cited by 112 publications

References 69 publications

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

Synthesis of graphene oxide supported copper–cobalt ferrite material functionalized by arginine amino acid as a new high–performance catalyst

Room‐Temperature NO2 Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO2 Monolayer Array Film

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Product

Resources

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Facile Synthesis of ZnO–Reduced Graphene Oxide Nanocomposites for NO₂ Gas Sensing Applications

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film