Preparation of graphene–TiO<sub>2</sub>composites with enhanced photocatalytic activity

Zhou, Kangfu; Zhu, Yihua; Yang, Xin; Jiang, Xin; Li, Chunzhong

doi:10.1039/c0nj00623h

Cited by 552 publications

(319 citation statements)

References 51 publications

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“…Raman spectra of the nanostructure ZnO nanorod films show a broad band (BB) centered at about 518 cm -1 [38]. The broad asymmetric peak observed at 584 cm -1 is assigned to the 1LO mode, in agreement with reported values for bulk, thin-film and nanocrystalline ZnO [34]- [36].…”

Section: Resultssupporting

confidence: 75%

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Shinde¹,

Nam²,

Patil³

et al. 2016

KEPCO Journal on Electric Power and Energy

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ZnO has nanostructured material because of unique properties suitable for various applications. Amongst all chemical and physics methods of synthesis of ZnO nanostructure, the hydrothermal method is attractive for its simplicity and environment friendly condition. Nanostructure ZnO thin films have been successfully synthesized on fluorine doped tin oxide (FTO) substrate using hydrothermal method. A possible growth mechanism of the various nanostructures ZnO is discussed in schematics. The prepared materials were characterized by standard analytical techniques, i.e., X-ray diffraction (XRD) and Field-emission scanning electron microscopy (SEM). The XRD study showed that the obtained ZnO nanostructure thin films are in crystalline nature with hexagonal wurtzite phase. The SEM image shows substrate surface covered with nanostructure ZnO nanrod. The UV-vis absorption spectrum of the synthesized nanostructure ZnO shows a strong excitonic absorption band at 365 nm which indicate formation nanostructure ZnO thin film. Photoluminescence spectra illustrated two emission peaks, with the first one at 424 nm due to the band edge emission of ZnO and the second broad peak centered around 500 nm possibly due to oxygen vacancies in nanostructure ZnO. The Raman measurements peaks observed at 325 cm -1 , 418 cm -1 , 518 cm -1 and 584 cm -1 indicated that nanostrusture ZnO thin film is high crystalline quality. We trust that nanostructure ZnO material can be effectively will be used as a highly active and stable phtocatalysis application.

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Section: Resultssupporting

confidence: 75%

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Shinde¹,

Nam²,

Patil³

et al. 2016

KEPCO Journal on Electric Power and Energy

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“…The increase in adsorption may enhance the photocatalytic degradation of methylene blue, assuming the adsorption of reactants is higher than the adsorption of the degradation products. Even though there are some works reporting the use of the TiO2/graphene composites in areas such as dyes degradation evaluation [14] and microorganism photoinactivation [15], the use of TiO2/graphene composites for NO deep oxidation has never been reported in literature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and assessment of a graphene-based composite photocatalyst

Magalhães

Ângelo

Sousa

et al. 2015

Biochemical Engineering Journal

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A novel composite photocatalyst prepared from graphene and commercial TiO2 (P25 from Evonik) was synthesized, exhibiting enhanced photocatalytic activity for methylene blue degradation, when com-pared with pristine P25. Additionally, the new catalyst showed 20% more NO conversion under UV light than P25. The band gap of the catalyst, obtained from diffuse reflectance, was 2.95 eV indicating an extended light absorption up to 420 nm. The novel photocatalyst was further tested for inactivating microorganisms showing better results than the reference photocatalyst. Under visible light, the viability loss of the reference bacterial strain Escherichia coli DSM 1103 was two times higher than with the bare P25; it was observed 29% of inactivation with the P25/graphene composite and 14% with the P25 sample, following standard ISO 27447:2009.

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“…Li 等 [27] 也用碳层对二氧化钛表面进行疏水改性来提高它的催化性能. 其他一些实验 [28,29] 也发现了石墨烯-TiO 2 混合材料的优越性能. 考虑到碳层对二氧化钛表面有一定的疏水改性效果, 且石墨烯是一种新型碳材料 [30,31] , 本文旨在采用计算机模拟的方法研究不同石墨烯覆盖率的二氧化钛表面对于 FN 吸附的影响, 了解吸附机理从而更好指导二氧化钛材料在生物医学领域的应用.…”

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Computer Simulations of Fibronectin Adsorption on Graphene Modified Titanium Dioxide Surfaces

Chen¹,

Liao²,

Jian³

et al. 2014

Acta Chim. Sinica

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Fibronectin (FN) could be used to modify the transplant of titanium dioxide. However, the hydrophilicity of titanium dioxide may prevent the stable adsorption of protein. Suitable hydrophobic modification of the surface can promote protein adsorption. In this work, all-atom molecular dynamics (MD) simulations were used to study the adsorption of FN on rutile surface, 23% graphene layer modified rutile surface, 92% graphene layer modified rutile surface and the graphite surface. The graphene layer can change the surface chemistry of rutile and break the strong interactions between rutile and water molecules. Parallel tempering Monte Carlo algorithm was used firstly to identify the global-minimum-energy orientation of FN. Subsequently, the orientation and conformation of adsorbed FN on modified titanium dioxide surfaces were studied by MD simulations. The simulation results show that FN can hardly adsorb on the rutile surface. Graphene layer deposited on titanium dioxide can reduce the surface hydrophilicity. When the rutile surface is covered by the graphene layer, FN adsorbs on the surface stably. The specific recognition site of FN faces toward the solution when FN is adsorbed on 23% graphene layer modified rutile surface, which is conducive to the identification of integrin. However, if too much graphene layer deposited on rutile, the specific recognition site of FN would get close to the surface due to the stronger adsorption. The minimum distance between FN and various surfaces can indicate the stability of protein adsorption on surfaces. DSSP analysis shows that the seven β-sheets of FN do not change much in all systems during the 40 ns MD simulations. Due to the deposition of graphene layer, the density of water molecules near the surface decreases. The adsorption energy of FN on different surfaces increases with higher surface graphene composition. Graphene modification could promote the fibronectin adsorption on rutile surfaces. This work can provide some guidance for the design and development of modified implant biomaterials.

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Preparation of graphene–TiO₂composites with enhanced photocatalytic activity

Cited by 552 publications

References 51 publications

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Synthesis and assessment of a graphene-based composite photocatalyst

Computer Simulations of Fibronectin Adsorption on Graphene Modified Titanium Dioxide Surfaces

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Preparation of graphene–TiO2composites with enhanced photocatalytic activity

Cited by 552 publications

References 51 publications

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Hydrothermally Synthesis Nanostructure ZnO Thin Film for Photocatalysis Application

Synthesis and assessment of a graphene-based composite photocatalyst

Computer Simulations of Fibronectin Adsorption on Graphene Modified Titanium Dioxide Surfaces

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Preparation of graphene–TiO₂composites with enhanced photocatalytic activity