Enhanced field emission of graphene–ZnO quantum dots hybrid structure

Sun, Lei; Zhou, Xiongtu; Zhang, Yongai; Guo, Tao

doi:10.1016/j.jallcom.2015.01.105

Cited by 22 publications

(7 citation statements)

References 20 publications

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“…Except for the improvement of the energy structure, the improvement of the FE properties with GO or Ag/GO decoration can also be attributed to the tunneling effect of electrons through the heterojunction. 46 Besides, the GO or Ag/GO sheets on ZnO NWs have lower turn-on fields, because such structures offer more contact points and protrusions between the ZnO NWs and GO or Ag/GO, which leads to easier electron transfer. Fig.…”

mentioning

confidence: 99%

Enhanced field-emission of silver nanoparticle–graphene oxide decorated ZnO nanowire arrays

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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This work presents a new method to improve the field emission (FE) properties of semiconductors decorated with low-cost graphene oxide (GO) nanosheets and trace amounts of noble metal. The Ag/GO/ZnO composite emitter exhibited efficient FE properties with a low turn-on field of 1.4 V μm(-1) and a high field enhancement factor of 7018. The excellent FE properties of the Ag/GO/ZnO composite can be attributed to the tunneling effect of electrons through the heterojunction. The FE properties of the Ag/GO/ZnO composite are slightly better than those of the Ag/ZnO composite which forms an energy well that collects electrons on interfaces when an electric field is applied. This behavior is associated with heterostructures that offer more contact points and protrusions between ZnO nanowire arrays (NWAs) and Ag/GO, which leads to easier electron transfer. High-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterise the connection and evolution of the ZnO NWAs and Ag/GO composites.

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confidence: 99%

Enhanced field-emission of silver nanoparticle–graphene oxide decorated ZnO nanowire arrays

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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“…It can be indicated from the F-N equation model that the field enhancement factor was determined by the slope of the ln (J/E 2 ) and (1/E) curves and the work function of the material. The work functions of graphene and zinc oxide are 5eV and 5.3eV, respectively [32]. Graphene/ZnO composites had a smaller work function than graphene or ZnO [33].…”

Section: Resultsmentioning

confidence: 99%

The Parameters of the Field Emission Model and the Fabrication of Zinc Oxide Nanorod Arrays/Graphene Film

Yang

Shao

et al. 2021

Front. Phys.

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A large-scale growth of zinc oxide (ZnO) nanorod arrays on graphene sheets was fabricated by a hydrothermal technique, and the Fowler–Nordheim theory was used to build a model to describe the properties of the arrays’ field emission. The results indicated that the morphological characteristics of the ZnO nanorods grown on the graphene sheets can be easily tuned by varying the reaction time and concentrations of the reaction solution. The regular ordered ZnO nanorods arrays on the graphene sheets were obtained under the appropriate experimental conditions. Further, this composite cathode was demonstrated to possess excellent field emission properties due to the outstanding mechanical and electrical properties of graphene. The field emission current density of the composite cathode reached 1,448 μA cm–2 at the electric field of 16.5 V μm–1. The key parameter, field enhancement factor, reached 6,366, while the pure graphene cathode field is about 1,660. These specific nanorod arrays with enhancement of the field emission properties would be useful to sensor or modulator units for accessing networks.

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“…The negative thermal quenching behaviour of ZnO NWs and graphene shells was studied through charging and discharging processes between the two components, and it shows a higher quantum tunnelling probability between graphene and ZnO at an increased temperature [247]. ZnO–graphene quantum dot hybrid structures have potential for use as cathodes for field emission transition applications [248–249]. Kavitha et al have prepared ZnO–rGO hybrids by a solution precipitation method and a hydrothermal method.…”

Section: Reviewmentioning

confidence: 99%

Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields

Jana¹,

Scheer²,

Polarz³

2017

Beilstein J. Nanotechnol.

112

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Single layer graphite, known as graphene, is an important material because of its unique two-dimensional structure, high conductivity, excellent electron mobility and high surface area. To explore the more prospective properties of graphene, graphene hybrids have been synthesised, where graphene has been integrated with other important nanoparticles (NPs). These graphene–NP hybrid structures are particularly interesting because after hybridisation they not only display the individual properties of graphene and the NPs, but also they exhibit further synergistic properties. Reduced graphene oxide (rGO), a graphene-like material, can be easily prepared by reduction of graphene oxide (GO) and therefore offers the possibility to fabricate a large variety of graphene–transition metal oxide (TMO) NP hybrids. These hybrid materials are promising alternatives to reduce the drawbacks of using only TMO NPs in various applications, such as anode materials in lithium ion batteries (LIBs), sensors, photocatalysts, removal of organic pollutants, etc. Recent studies have shown that a single graphene sheet (GS) has extraordinary electronic transport properties. One possible route to connecting those properties for application in electronics would be to prepare graphene-wrapped TMO NPs. In this critical review, we discuss the development of graphene–TMO hybrids with the detailed account of their synthesis. In addition, attention is given to the wide range of applications. This review covers the details of graphene–TMO hybrid materials and ends with a summary where an outlook on future perspectives to improve the properties of the hybrid materials in view of applications are outlined.

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Enhanced field emission of graphene–ZnO quantum dots hybrid structure

Cited by 22 publications

References 20 publications

Enhanced field-emission of silver nanoparticle–graphene oxide decorated ZnO nanowire arrays

Enhanced field-emission of silver nanoparticle–graphene oxide decorated ZnO nanowire arrays

The Parameters of the Field Emission Model and the Fabrication of Zinc Oxide Nanorod Arrays/Graphene Film

Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields

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