Acid-free co-operative self-assembly of graphene-ZnO nanocomposites and its defect mediated visible light photocatalytic activities

Parameshwari, R.; Jothivenkatachalam, Kandasamy; Banks, Craig E.; Jeganathan, K.

doi:10.1016/j.physb.2016.10.039

Cited by 7 publications

(2 citation statements)

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“…The properties of ZnO/graphene composite films are different from those of the individual constituent materials. Experimental studies have been conducted on graphene composites with ZnO nanoparticles or nanorods [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. In these studies, the composite films showed superior photovoltaic [ 31 ], photocatalytic [ 32 ], photoluminescence [ 33 ], antibacterial [ 34 ], and sensing [ 35 ] properties due to the high transmittance, electron collection enhancement, obstruction of electron–hole pair recombination [ 29 ], and good contact between the ZnO and graphene [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that by changing the layer spacing of ZnO/graphene, the carrier mobility of the system could be modulated [ 37 ], and the O-C bond became stronger, with the bond distance decreased from 1.8 Å [ 38 ]. Several studies have investigated the connection mechanism of ZnO/graphene and its synthesis, exploring the charge transfer between graphene and ZnO with decreasing distance of the ZnO/graphene layers and the bond formation of ZnO/graphene [ 26 ], which is due to synergistic interaction in ZnO/graphene nanocomposites [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Chemical Effects of Amorphous Zinc Oxide/Graphene

Zhao

Fang

et al. 2021

Materials

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Research on the preparation and performance of graphene composite materials has become a hotspot due to the excellent electrical and mechanical properties of graphene. Among such composite materials, zinc oxide/graphene (ZnO/graphene) composite films are an active research topic. Therefore, in this study, we used the vacuum thermal evaporation technique at different evaporation voltages to fabricate an amorphous ZnO/graphene composite film on a flexible polyethylene terephthalate (PET). The amorphous ZnO/graphene composite film inherited the great transparency of the graphene within the visible spectrum. Moreover, its electrical properties were better than those of pure ZnO but less than those of graphene, which is not consistent with the original theoretical research (wherein the performance of the composite films was better than that of ZnO film and slightly lower than that of graphene). For example, the bulk free charge carrier concentrations of the composite films (0.13, 1.36, and 0.47 × 1018 cm−3 corresponding to composite films with thicknesses of 40, 75, and 160 nm) were remarkably lower than that of the bare graphene (964 × 1018 cm−3) and better than that of the ZnO (0.10 × 1018 cm−3). The underlying mechanism for the abnormal electrical performance was further demonstrated by X-ray photoelectron spectroscopy (XPS) detection and first-principles calculations. The analysis found that chemical bonds were formed between the oxide (O) of amorphous ZnO and the carbon (C) of graphene and that the transfer of the π electrons was restricted by C=O and C-O-C bonds. Given the above, this study further clarifies the mechanism affecting the photoelectric properties of amorphous composite films.

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