WO3 nanorods/graphene nanocomposites for high-efficiency visible-light-driven photocatalysis and NO2 gas sensing

An, Xiaoqiang; Yu, Jimmy C.; Wang, Yu; Hu, Yongming; Yu, Xuelian; Zhang, Guangjin

doi:10.1039/c2jm16709c

Cited by 488 publications

(251 citation statements)

References 41 publications

(41 reference statements)

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“…This suppression is attributed to the presence of graphene, which acts as an acceptor of electrons in the nanocomposite. 55 Graphene sheets provide an additional path for the conduction electrons of SiO2. The suppression of PL intensity indicates the decrease in carriers' recombination.…”

Section: Photoluminescence and Surface Area Analysismentioning

confidence: 99%

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Arshad

Iqbal

Mansoor

et al. 2017

Journal of Applied Physics

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ABSTRACT:The exceptional conducting nature of graphene makes it a viable candidate for enhancing the effectiveness of photocatalytic and biomedical nanomaterials. Herein, the immobilization of monodispersed silicon dioxide (SiO2) nanoparticles on multiple graphene layers is demonstrated for intercalation of graphene nanoplatelets (GNPs). Interestingly, the loading of graphene nanoplatelets with SiO2 nanoparticles enhances the photocatalytic efficiency from 46% to 99%. For biomedical applications, it is found that 75% of Gram positive and 50% of Gram negative bacteria have been killed, hence bacterial proliferation is significantly restricted. Further, the cytotoxicity study reveals that the synthesised nanocomposites are non-toxic for both normal (HCEC) and cancerous (MCF-7, HEp-2) cell lines which signifies their potential as carriers for drug delivery. The prepared nanocomposites with controlled amount of carbon in the form of graphene can be employed for photocatalysis based waste water remediation, biomedicine and nano drug delivery.

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Section: Photoluminescence and Surface Area Analysismentioning

confidence: 99%

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Arshad

Iqbal

Mansoor

et al. 2017

Journal of Applied Physics

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“…The former method is relevant to the structural modification of WO 3 by means of incorporating other semiconductors with appropriate electronic structures, metal and nonmetal elements, and doping with metal ions [9][10][11][12][13][14][15][16][17][18]. With suitable ingredients, accumulated electrons on conduction band of WO 3 tend to be completely transferred and accordingly, the recombination rate of photogenerated hole-electron pairs is greatly depressed [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

Chang

Wang

Luo

et al. 2016

Journal of Colloid and Interface Science

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a b s t r a c tA series of tungsten-containing mesoporous SBA15 with different tungsten contents were prepared through a direct co-condensation sol-gel method and then analyzed by various techniques. XRD patterns revealed that the original mesoporous morphology was maintained after introducing tungsten species and forms of tungsten species were changed from incorporated tungsten to isolated tungsten species or low oligomeric tungsten oxide species, and finally to crystalline WO 3 with the increase of tungsten precursor content, which were also proven by HRTEM images, UV-Vis DRS, and FT-IR spectra. The W-SBA15 samples exhibited satisfactory photocatalytic performance toward degradation of dye Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP). In particular, the best candidate, sample 10%W-SBA15 showed an apparent reaction rate constant for RhB that was nearly 10 times as high as that of bulk WO 3 . The enhancement of photocatalytic capability was attributed to the mesoporous morphology with enlarged surface areas, negatively charged surface, and favorable tungsten forms such as incorporated tungsten, isolated tungsten or low oligomeric tungsten oxide species. In addition, active radicals trapping experiments and DMPO spin-trapping ESR spectra indicated that photogenerated holes were major oxidative species during photocatalysis.

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“…182 In another study An et al have shown that the incorporation of WO 3 nanorods on a graphene substrate can be used for high-efficiency visible-light-driven photocatalysis, as well as NO 2 gas sensing. 118 It is believed upon adsorption of the NO 2 gas on the WO 3 nanorods that there is an increase in the thickness of the depletion layer. This increase in the depletion layer thickness translates into an increased resistance and thus an improved sensing ability.…”

Section: Reactive Gas Adsorptionmentioning

confidence: 99%

Environmental applications using graphene composites: water remediation and gas adsorption

et al. 2013

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This review deals with wide-ranging environmental studies of graphene-based materials on the adsorption of hazardous materials and photocatalytic degradation of pollutants for water remediation and the physisorption, chemisorption, reactive adsorption, and separation for gas storage. The environmental and biological toxicity of graphene, which is an important issue if graphene composites are to be applied in environmental remediation, is also addressed.

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WO3 nanorods/graphene nanocomposites for high-efficiency visible-light-driven photocatalysis and NO2 gas sensing

Cited by 488 publications

References 41 publications

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

Environmental applications using graphene composites: water remediation and gas adsorption

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