具有超低开启电压的高性能稳定场发射：来自rGO共形包覆TiO2纳米管三维阵列

High-Performance Stable Field Emission with Ultralow Turn on Voltage from rGO Conformal Coated TiO2 Nanotubes 3D Arrays.

作者信息

Agrawal Yogyata, Kedawat Garima, Kumar Pawan, Dwivedi Jaya, Singh V N, Gupta R K, Gupta Bipin Kumar

机构信息

CSIR - National Physical Laboratory, Dr K S Krishnan Road, New Delhi, 110012, India.

Department of Physics, Kalindi College, University of Delhi, New Delhi, 110008, India.

出版信息

Sci Rep. 2015 Jul 8;5:11612. doi: 10.1038/srep11612.

DOI:10.1038/srep11612

PMID:26152895

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4495390/

Abstract

A facile method to produce conformal coated reduced graphene oxide (rGO) on vertically aligned titanium oxide (TiO2) nanotubes three dimensional (3D) arrays (NTAs) is demonstrated for enhanced field emission display applications. These engineered nano arrays exhibit efficient electron field emission properties such as high field emission current density (80 mA/cm(2)), low turn-on field (1.0 V/μm) and field enhancement factor (6000) with high emission current stability. Moreover, these enhancements observed in nano arrays attribute to the contribution of low work function with non-rectifying barriers, which allow an easy injection of electrons from the conduction band of TiO2 into the Fermi level of reduced graphene oxide under external electric field. The obtained results are extremely advantageous for its potential application in field emission devices.

摘要

展示了一种在垂直排列的二氧化钛（TiO₂）纳米管三维（3D）阵列（NTAs）上制备保形包覆还原氧化石墨烯（rGO）的简便方法，以用于增强场发射显示应用。这些工程化的纳米阵列表现出高效的电子场发射特性，如高场发射电流密度（80 mA/cm²）、低开启场（1.0 V/μm）和场增强因子（6000），且发射电流稳定性高。此外，在纳米阵列中观察到的这些增强归因于具有非整流势垒的低功函数的贡献，这使得在外部电场作用下，电子能够轻松地从TiO₂的导带注入到还原氧化石墨烯的费米能级。所获得的结果对于其在场发射器件中的潜在应用极为有利。