Pt-decorated zinc oxide nanorod arrays with graphitic carbon nitride nanosheets for highly efficient dual-functional gas sensing

Tian, Hailin; Fan, Huiqing; Ma, Jiangwei; Liu, Zhiyong; Ma, Longtao; Lei, Shenhui; Fang, Jingyang; Long, Changbai

doi:10.1016/j.jhazmat.2017.07.056

Cited by 272 publications

(72 citation statements)

References 67 publications

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“…To improve the performance in electrochemical applications, g-C 3 N 4 /ZnO heterostructures were hybridized with other nanostructures to fabricate ternary composites such as g-C 3 N 4 /ZnO/GO and g-C 3 N 4 /ZnO/polyaniline. [183] Another interesting work was to deposit CoO x nanoparticles on WO 3 /g-C 3 N 4 heterostructures for creating ternary WO 3 /g-C 3 N 4 /CoO x composites with significantly enhanced photo-electrochemical water oxidation. [181] For g-C 3 N 4 / PANI/ZnO composites, charge separation efficiency, specific surface area and visible light harvesting were simultaneously improved for achieving superior visible photocatalytic capability in degradation of methylene blue and 4-chlorophenol, which was ≈3.6 and ≈3.3 times higher compared to those for g-C 3 N 4 , respectively.…”

Section: Hybridization With Nanostructuresmentioning

confidence: 99%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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The discovery of graphene and subsequent verification of its unique properties have aroused great research interest to exploit diversified graphene‐analogous 2D nanomaterials with fascinating physicochemical properties. Through either physical or chemical doping, linkage, adsorption, and hybridization with other functional species into or onto them, more novel/improved properties are readily created to extend/expand their functionalities and further achieve great performance. Here, various functionalized hybridizations by using different types of 2D nanomaterials are overviewed systematically with emphasis on their interaction formats (e.g., in‐plane or inter plane), synergistic properties, and enhanced applications. As the most intensely investigated 2D materials in the post‐graphene era, transition metal dichalcogenide nanosheets are comprehensively investigated through their element doping, physical/chemical functionalization, and nanohybridization. Meanwhile, representative hybrids with more types of nanosheets are also presented to understand their unique surface structures and address the special requirements for better applications. More excitingly, the van der Waals heterostructures of diverse 2D materials are specifically summarized to add more functionality or flexibility into 2D material systems. Finally, the current research status and faced challenges are discussed properly and several perspectives are elaborately given to accelerate the rational fabrication of varied and talented 2D hybrids.

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Section: Hybridization With Nanostructuresmentioning

confidence: 99%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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“…Apart from gas sensing, ZnO has attracted high technological applications, like photodetectors, photodiodes, surface acoustic wave filters, solar cells, photonic crystals, LEDs, optical waveguides, due to its wide direct band gap (3.3 eV) and large excitation binding energy (60 meV) [6][7][8][9][10][11][12]. In the state of the art, doping of noble metals like gold (Au), platinum (Pt), ruthenium (Ru), nickel (Ni), palladium (Pd), gallium (Ga), silver (Ag) and their combinations showed significant improvement in ZnO-based gas sensor [13][14][15][16][17][18][19][20]. The loading of these noble metals into parent metal oxide amplifies the charge transfer mechanism.…”

Section: Introductionmentioning

confidence: 99%

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

et al. 2019

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Nanostructure synthesis at low temperature with high purity and yield has a great potential in the present competitive research and development of nanomaterials for varieties of application. Here, we demonstrate the facile hydrothermal synthesis of ZnO nanocomposites at low hydrothermal temperature and time. With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. Both the obtained nanostructures were analyzed using physio-chemical characterizing tools and examined for practical relevance as gas sensing material. The optimized sample was further treated to Ag loading (1-5 mol%) for lowering the operating temperature of the sensor. ZnO sample with 3 mol% Ag loading showed excellent sensitivity of 92.7% for 1000 ppm of acetone concentration with a drop in the operating temperature from 325 °C (Pristine ZnO) to 250 °C (Ag-loaded ZnO). The morphological correlation with reaction time and thereby sensitivity and spillover mechanism are discussed. Graphic abstractKeywords Composite materials · Hydrothermal process · Ag/ZnO · Sensors · Acetone However, in the present industrial scenario, chemical synthesis of these nanomaterials is facing enormous challenges in terms of trimming the overall process span and production at low temperature. Though hydrothermal synthesis route offers decent advantages over conventional synthesis routes, its high reaction temperature (hence high pressure) and longer reaction time are the major concerns at pilot/industrial-scale production. However, by effective tuning of reaction temperature in combination with the reaction time, one can get the same nanomaterial in the desired morphology. Here, the problem addressed in the paper is to ease the high temperature and time-consuming process for synthesizing ZnO-based nanostructures. The efforts were made to custom tailor the ZnO nanostructures at lower hydrothermal temperature (80 °C) and shorter reaction time (2-10 h). With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. The obtained nanostructures are Compliance with ethical standardsConflict of interest The authors declare that there is no competing interest whatsoever.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Besides, in recent years, ZnO has become one of the most studied materials due to its very interesting properties in optoelectronic devices application such as; room temperature lasers, 1 light emitting diodes, 2,3 ultraviolet (UV) detectors, 4 eld-emission displays, 5-7 photonic crystals, 8 solar cells 9,10 and sensing in the nano-size range. 11 The control of its properties is primarily in the context of novel applications as highly efficient gas sensing material 12,13 and photocatalysis. 14,15 For this reason, a better understanding of the synthesis of microstructures with different morphologies is important and necessary to achieve objectives and applications on materials for the modern world.…”

Section: Introductionmentioning

confidence: 99%