Composite structure of ZnO films coated with reduced graphene oxide: structural, electrical and electrochemical properties

Shuai, Weiqiang; Hu, Yuehui; Chen, Yi-Chuan; Hu, Keyan; Zhang, Xiaohua; Zhu, Wenjun; Tong, Fan; Lao, Zixuan

doi:10.1088/1674-4926/39/2/023001

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…As a consequence, it can be suggested that the conductivity of the ZnO thin film improved by the presence of the rGO into the films structure. A reason for this phenomenon is that graphene shows bipolar nature, so it can transfer electrons and holes almost immediately, which can increase the carrier concentration [46]. The spectra of ZnO and ZnO-rGO_3 thin films are composed of two main peaks.…”

Section: Optical Measurementsmentioning

confidence: 99%

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

et al. 2020

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Thin films of nanocomposite of zinc oxide–reduced graphene oxide (ZnO-rGO) deposited on soda-lime glass substrates were prepared using ultrasonic spray pyrolysis (USP) at 460 °C. The preparation process does not use harsh acids and is environmentally friendly. The deposition period of 2, 3.5 and 5 min resulted in compact, uniform samples with thicknesses of 148, 250 and 365 nm, respectively. After performing structural, morphological, optical and electrical characterization of the prepared nanocomposite, an influence of the deposition time on the physical properties of the obtained films was determined. TEM analyses indicate that the ZnO-rGO nanocomposite presents ZnO nanoparticles anchored on graphene sheets, while XRD, X-ray Photoelectron Spectroscopy (XPS) and Raman results show the presence of a ZnO phase in the ZnO-rGO films. HR-SEM studies showed changes of the ZnO-rGO thin films morphology due to the incorporation of graphene into the ZnO films. Here, the particles of ZnO are similar to small grains of rice and graphene films have the appearance of a little “rose”. As the thickness of the film increases with deposition time, it reduces the structure of resistance of the nanocomposite thin films to 135 Ω. In addition, the optical transmission of the thin films in the visible region resulted affected. Here, we report a simple methodology for the preparation of ZnO-rGO nanocomposite thin films.

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Section: Optical Measurementsmentioning

confidence: 99%

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

et al. 2020

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“…[34] While, the increase of the lattice parameters in ZnO:Ag/rGO thin film might be due to the residual stress in the sample or to the lattice strain due to the existence of rGO. [35,36] On the other hand, as can be seen in Fig. 3, the sizes decreased remarkably from 24.138 nm to 20 nm after Ag doping, which is due to the restriction caused by the defects in the growth of the crystallites.…”

Section: Xrd Propertiesmentioning

confidence: 86%

Photoelectrochemical activity of ZnO:Ag/rGO photo-anodes synthesized by two-steps sol-gel method

Jemia¹,

Karyaoui²,

Wederni³

et al. 2022

Chinese Phys. B

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This work investigate the influence of Silver Plasmon and reduced graphene oxide (rGO) on the photoelectrochemical performance (PEC) of ZnO thin films synthesized by the sol-gel method. The physicochemical properties of the obtained photo-anodes were systematically studied using several characterization techniques. The X-ray diffraction analysis showed that all samples presented hexagonal Wurtzite structure with apolycrystalline nature. Raman and EDX studies confirmed the existence of both Ag and rGO in ZnO: Ag/rGO thin films. The estimated grain size obtained from (SEM) analysis decreased with Ag doping, then increased to a maximum value after rGO addition. The UV-vis transmission spectra of the as-prepared ZnO: Ag and ZnO: Ag/rGO thin films have shown a reduction in the visible range with a redshift at the absorption edges. The bandgaps were estimated to be around 3.17, 2.7, and 2.52 eV for ZnO, ZnO: Ag, and ZnO: Ag/rGO, respectively. Moreover, the electrical measurements revealed that the charge exchange processes were enhanced at the ZnO: Ag/rGO/electrolyte interface, accompanied by an increase in the (PEC) performance compared to ZnO and ZnO: Ag photo-anodes. Consequently, the photocurrent density of ZnO: Ag/rGO (0.2 mA.cm-2) was around 4 and 2.22 times higher than photo-anodes based on undoped ZnO (0.05 mA.cm-2) and ZnO: Ag (0.09 mA.cm-2), respectively. Finally, from the flat band potential and donor density, deduced from the Mott-Schottky, it was clear that all the samples were n-type semiconductors with the highest carrier density for the ZnO: Ag/rGO photo-anode.

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“…Sua fase wurtzita não centrossimétrica exibe grandes propriedades piezoelétricas e piroelétricas que o fazer o excelente candidato a aplicações em dispositivos como atuadores mecânicos e sensores piezoelétricos 42,43 . Além disso, é um material tecnológico importante para aplicações em dispositivos eletrônicos e ópticos como células solares, armazenamento de energia, proteção UV, display de emissão de luz (LED), sensores de gás entre outros 39,44 . O ZnO também pode ser sintetizado em diversas nanoestruturas como nanotubos, nanofios, nanorods, nanobelts, tetrápodes e nanofitas 42 .…”

Section: Estrutura E Propriedadesunclassified

Síntese e caracterização de óxido de grafeno reduzido (rGO) e nanocompósito de rGO/ZnO para aplicação em sensores de gás ozônio

Komorizono¹

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Composite structure of ZnO films coated with reduced graphene oxide: structural, electrical and electrochemical properties

Cited by 9 publications

References 14 publications

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

The Influence of Deposition Time on the Structural, Morphological, Optical and Electrical Properties of ZnO-rGO Nanocomposite Thin Films Grown in a Single Step by USP

Photoelectrochemical activity of ZnO:Ag/rGO photo-anodes synthesized by two-steps sol-gel method

Síntese e caracterização de óxido de grafeno reduzido (rGO) e nanocompósito de rGO/ZnO para aplicação em sensores de gás ozônio

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