CuO-Decorated ZnO Hierarchical Nanostructures as Efficient and Established Sensing Materials for H2S Gas Sensors

Vuong, Nguyen Minh; Chinh, Nguyen Duc; Huy, Bui The; Lee, Yong‐Ill

doi:10.1038/srep26736

Cited by 169 publications

(75 citation statements)

References 52 publications

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“…The detection mechanism consists of the strong electronic sensitization brought about by the copper oxides, which sulfurize to CuS or Cu 2 S upon exposure to H 2 S. In contrast to copper oxides, which are p -type semiconductors, copper sulfides are metallic and, therefore, exposure to H 2 S results in a dramatic increase in conductivity of the p-n nanomaterial. Furthermore, this sulfurization process is reversible, i.e., copper oxides are regenerated upon cleaning with air, which makes this approach very interesting for the chemoresistive sensing of H 2 S. Employing this approach, the detection of hydrogen sulfide in a wide concentration range has been reported (200 ppb to 1500 ppm) with a lower detection limit of about 20 ppb [35,36,37,38,39,40,41,42,43,44,45,46,47,52]. The best response and recovery times reported are units and tens of seconds, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…The selectivity in the detection of hydrogen sulfide and the effect of ambient moisture are not reported in these initial studies. Since then, many authors have reported the use of p -type cuprous or cupric oxides onto n -type metal oxides for detecting H 2 S. These include CuO-SnO 2 [38,39,40,41,42], Cu 2 O-SnO 2 [43], CuO-ZnO [44,45], CuO-SnO 2 -ZnO [46], and Cu 2 O-WO 3 [47] nanocomposites. Most papers show that the optimal operating temperature lies in the range from 100 °C to 400 °C, however, a few examples are given on the room-temperature detection of hydrogen sulfide [40,43].…”

Section: Metal Oxide Nanomaterialsmentioning

confidence: 99%

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Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Llobet

Brunet

Pauly

et al. 2017

Sensors

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This paper presents a focused review on the nanomaterials and associated transduction schemes that have been developed for the selective detection of hydrogen sulfide. It presents a quite comprehensive overview of the latest developments, briefly discusses the hydrogen sulfide detection mechanisms, identifying the reasons for the selectivity (or lack of) observed experimentally. It critically reviews performance, shortcomings, and identifies missing or overlooked important aspects. It identifies the most mature/promising materials and approaches for achieving inexpensive hydrogen sulfide sensors that could be employed in widespread, miniaturized, and inexpensive detectors and, suggests what research should be undertaken for ensuring that requirements are met.

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Section: Discussionmentioning

confidence: 99%

Section: Metal Oxide Nanomaterialsmentioning

confidence: 99%

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Llobet

Brunet

Pauly

et al. 2017

Sensors

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“…Functionalization of ZnO with metal oxide nanoparticles has found a great interest in recent years for the formation of semiconductive heterostructures with advanced optical, catalytic and electronic properties . Several p‐type metal oxide NPs like copper oxide (CuO), nickel oxide (NiO) or cobalt oxide (Co 3 O 4 ) have been deposited on n‐type ZnO nanostructures to form p‐n junction based devices. Heterostructures between semiconductors with different majority carrier type strongly enhanced photocatalytic efficiency.…”

Section: Surface‐engineering Of Zno Nanostructures With Nanoparticlesmentioning

confidence: 99%

Surface Engineering of Nanostructured ZnO Surfaces

Laurenti

Stassi

Canavese

et al. 2016

Adv Materials Inter

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are oriented in one direction and their assembly and stacking produces the wurtzite hexagonal symmetry. The noncentrosymmetric and anisotropic crystalline structure of wurtzite-like ZnO generates very interesting properties such as piezo-and pyro-electricity: the application of an external stimulus, like mechanical stress or temperature, deforms the tetrahedron structure. This deformation results in a separation between the positive and negative centers of charge, inducing the formation of a dipole moment. [7,8] The polar surface and anisotropic structure of ZnO can be usefully exploited to form different kinds of micro and nanostructures from 0D to 3D, [5] including, but not limited to nanowires, [9][10][11][12] nanotubes, [13,14] nanobelts, [15][16][17][18][19] nanorings, [20] flower-like morphologies, [21][22][23][24][25] multipods, [26,27] tetrapods, [28][29][30] sponge-like structures [31][32][33][34] and so on [29,[35][36][37][38][39] (Figure 1). Therefore, several research efforts have been invested in studying various preparation procedures for ZnO micro and nano-materials. Wet chemical approaches, like sol-gel, hydrothermal growths, electrodeposition and template-assisted routes, [40,41] as well as vapor-phase methods, for example chemical vapour deposition (CVD), physical vapour deposition (PVD) including sputtering and evaporation approaches, [42][43][44] and epitaxial growth methods [45] are among the most used ones. The great advantages of the wet chemical approaches are the high synthesis versatility, low temperature employed and low costs. [9] From the other side, dry methods take advantage of the high quality and excellent control over the level of crystallinity of the synthesized ZnO structures, as well as the absence of contamination and high purity of the final material. [46] The combination of different properties with the ease and high versatile synthesis of ZnO material in different micro and nanostructures offers a huge possibility of potential applications.For example, ZnO is already used as an efficient catalyst in the selective oxidation of involving oxygenates (i.e., alcohols, aldehydes, and carboxylic acids) and in methanol synthesis catalysts. It is also largely applied as protective, anti-corrosion layer in galvanized steel products, [49][50][51] as well as in paints and sunscreens as an UV absorber. Its biocompatibility makes this material suitable, in the form of microparticles, for paste formulations in cosmetic applications.The combination of the piezoelectric with the semiconducting properties of ZnO is found to result into new exciting physical properties, [52][53][54] and it has recently opened the research field to energy harvesting application. ZnO nanomaterials can be thus used as nanogenerators, able to convert the mechanical deformation from the surrounding environment into electrical Zinc Oxide (ZnO) nanostructures represent promising substrate materials for numerous applications, ranging from new generation solar cells, to bio-and chemical sensors. This interest is due ...

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“…Due to the mixing of MOS and other materials, it formed a variety of the unique properties for sensing material, such as a change in conductance, improved surface catalytic property, increasing surface reaction sites, and producing a high porosity [12]. In addition, a formed contact potential at the interface between MOS and other nanostructured materials has also enhanced the sensing performance of a gas sensor [13,14].…”

Section: Introductionmentioning

confidence: 99%

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Chaitongrat

Chaisitsak

2018

Journal of Nanomaterials

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We present performance of a room temperature LPG sensor based on -Fe 2 O 3 /CNT (carbon nanotube) nanocomposite films. The nanocomposite film was fabricated via the metallic Fe catalyst particle on CNTs in which both the catalyst particles and the CNT were simultaneously synthesized by chemical vapor deposition (CVD) synthesis and were subsequently annealed in air to create -Fe 2 O 3 . These methods are simple, inexpensive, and suitable for large-scale production. The structure, surface morphologies, and LPG response of nanocomposite films were investigated. Raman spectroscopy and XPS analysis showed the formation of -Fe 2 O 3 on small CNTs (SWNTs). Morphological analysis using FE-SEM and AFM revealed the formation of the porous surface along with roughness surface. Additionally, the sensing performance of -Fe 2 O 3 /CNTs showed that it could detect LPG concentration at lower value than 25% of LEL with response/recovery time of less than 30 seconds at room temperature. These results suggest that the -Fe 2 O 3 /CNTs films are challenging materials for monitoring LPG operating at room temperature.

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CuO-Decorated ZnO Hierarchical Nanostructures as Efficient and Established Sensing Materials for H2S Gas Sensors

Cited by 169 publications

References 52 publications

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Surface Engineering of Nanostructured ZnO Surfaces

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

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CuO-Decorated ZnO Hierarchical Nanostructures as Efficient and Established Sensing Materials for H2S Gas Sensors

Cited by 169 publications

References 52 publications

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Surface Engineering of Nanostructured ZnO Surfaces

Fast-LPG Sensors at Room Temperature by α-Fe2O3/CNT Nanocomposite Thin Films

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Product

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Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films