Low-temperature NO 2 gas sensor fabricated with NiO and reduced graphene oxide hybrid structure

Ngo, Yen-Linh Thi; Hur, Seung Huyn

doi:10.1016/j.materresbull.2016.08.004

Cited by 72 publications

(25 citation statements)

References 41 publications

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“…metal chlorides, sulfates, nitrates and acetates. For 2D-in-3D hierarchical architectures, the metal oxide may grow in the desired structure spontaneously [33][34][35][36][37] or structure-directing agents such as cetyltrimethylammoniumbromide [38][39][40][41], glycerol [39,42], hexamethylenetetramine [23,[43][44][45], polyvinylpyrrolidone [2,40,46,47], urea [25,40,48,49], sodiumdodecylsulfate [50][51][52] or polyethyleneglycol [52][53][54][55] can be added. Also, seed layers may be employed to initiate growth [23,24,43,44,56] and occasionally microwave-assisted procedures are used [57,58].…”

Section: Synthesis Of 2d Nanoflakesmentioning

confidence: 99%

2D metal oxide nanoflakes for sensing applications: Review and perspective

Dral

Elshof

2018

Sensors and Actuators B: Chemical

123

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In this review the state of the art and future prospects of 2-dimensional (2D) metal oxide nanoflakes used as active sensing elements for the detection of solutes, gases and radiation are discussed. 2D material geometries are particularly interesting for sensing applications because they provide large specific surface areas and are suitable for crystal facet engineering. In addition, unique material properties of atomically thin nanosheets due to quantum size effects provide engineering possibilities beyond the realm of their bulk counterparts. A variety of possibilities in materials, synthesis routes, (hierarchical) sensor architectures and application areas is sketched. The discussion is focused on high-performing sensors and innovative concepts. The scope is limited to nanoflakes with a thickness of up to 50 nm. Special attention is given to sensing based on material properties that are unique to atomically thin nanosheets.

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Section: Synthesis Of 2d Nanoflakesmentioning

confidence: 99%

2D metal oxide nanoflakes for sensing applications: Review and perspective

Dral

Elshof

2018

Sensors and Actuators B: Chemical

123

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“…[102][103][104] The C 1s spectrum shown in Fig. 4d has peaks at binding energies of 284.8 eV (alkyl and aromatic C-C, C-H), 286.3 eV (C-OH, C-O-C and C-N) 52,53 and 288.7 eV (C]O). 112 C 1s peaks can be attributed to the phyto-capping molecules as well as some contribution from adventitious carbon.…”

Section: Resultsmentioning

confidence: 99%

Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

et al. 2020

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To deal with fossil fuel depletion and the rise in global temperatures caused by fossil fuels, cheap and abundant materials are required, in order to fulfill energy demand by developing high-performance fuel cells and electrocatalysts. In this work, a natural organic agent has been used to synthesize nanostructured ZnO/Mn 3 O 4 with high surface area and enhanced electrocatalytic performance. Upon preannealing treatment, mixed metal oxide precipitates are formed due to the complex formation between a metal oxide and organic extract. The thermally annealed mixed oxide ZnO/Mn 3 O 4 was characterized by XRD diffractometer, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). Gas chromatography-mass spectrometry (GC-MS) identified methyldecylamine as a major stabilizing agent of the synthesized nanomaterial. Using a Tauc plot, the calculated band energy for the synthesized ZnO/Mn 3 O 4 mixed metal oxide was 1.65 eV.Moreover, we have demonstrated the effects of incorporated organic compounds on the surface chemistry, morphology and electrochemical behavior of ZnO/Mn 3 O 4 . The phyto-functionalized ZnO/ Mn 3 O 4 was deposited on Ni-foam for electrocatalytic studies. The fabricated electrode revealed good performance with low over-potential and Tafel slope, suggesting it to be suitable as a potential catalyst for water splitting application, in particular for the oxygen evolution reaction (OER). The overall findings of the current study provide a cost-effective and efficient organic template for functionalization and sustainable fabrication of ZnO/Mn 3 O 4 nanomaterial for application as an electrocatalyst.

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“…Two main Raman features such as well-defined D-band line at~1345 cm −1 and G-band line at~1570 cm −1 were clearly observed. The D-band line is related to the amount of defect sites in graphene, whereas the G-band line represents the relative degree of graphitization [35]. I D /I G ratio was calculated for GO, Ni/GO-1 and Ni/GO-2 from the intensity of D band and G band.…”

Section: Characterization Of Ni/go Nanocompositesmentioning

confidence: 99%

Facile Mechanochemical Synthesis of Nickel/Graphene Oxide Nanocomposites with Unique and Tunable Morphology: Applications in Heterogeneous Catalysis and Supercapacitors

et al. 2019

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In this study, a very simple and highly effective mechanochemical preparation method was developed for the preparation of Ni nanoparticles supported graphene oxide (GO) nanocomposites (Ni/GO, where Ni is a composition of Ni(OH)2, NiOOH, NiO, Ni2O3 and NiO2), 3 wt% NiO/GO (Ni/GO-1) and 8 wt% NiO/GO(Ni/GO-2). The developed method is not only very simple and efficient, but also, the morphology of Ni/GO nanocomposites can be tuned by simply varying the metal loading. Morphology and specific surface area of the resultant Ni/GO nanocomposites were investigated by mean of AFM, HR-TEM and BET. Chemical sate and factual content of Ni in Ni/GO-1 and Ni/GO-2, and the presence of defective sites in Ni-nanocomposites were investigated in detail. To our delight, the prepared Ni/GO-2 demonstrated superior catalytic activity toward the reduction of 2- and 4-nitrophenol in water with high rate constant (kapp) of 35.4 × 10−3 s−1. To the best of our knowledge, this is the best efficient Ni-based graphene nanocomposites for the reduction of 2- and 4-NP reported to date. The Ni/GO-1 and Ni/GO-2 demonstrated an excellent reusability; no loss in its catalytic activity was noticed, even after 10th cycle. Surprisingly the Ni/GO-2 as electrode material exhibited an excellent specific capacitance of 461 F/g in 6 M KOH at a scan rate of 5 mV. Moreover, the Ni/GO nanocomposites were found to possess poor electrical resistance and high stability (no significant change in the specific capacitance even after 1000 cycles).

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Low-temperature NO 2 gas sensor fabricated with NiO and reduced graphene oxide hybrid structure

Cited by 72 publications

References 41 publications

2D metal oxide nanoflakes for sensing applications: Review and perspective

2D metal oxide nanoflakes for sensing applications: Review and perspective

Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

Facile Mechanochemical Synthesis of Nickel/Graphene Oxide Nanocomposites with Unique and Tunable Morphology: Applications in Heterogeneous Catalysis and Supercapacitors

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Low-temperature NO 2 gas sensor fabricated with NiO and reduced graphene oxide hybrid structure

Cited by 72 publications

References 41 publications

2D metal oxide nanoflakes for sensing applications: Review and perspective

2D metal oxide nanoflakes for sensing applications: Review and perspective

Organic template-based ZnO embedded Mn3O4 nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation

Facile Mechanochemical Synthesis of Nickel/Graphene Oxide Nanocomposites with Unique and Tunable Morphology: Applications in Heterogeneous Catalysis and Supercapacitors

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Organic template-based ZnO embedded Mn₃O₄ nanoparticles: synthesis and evaluation of their electrochemical properties towards clean energy generation