不同温度下石墨烯边缘的吸附状态及场发射特性演变

The adsorption state and the evolution of field emission properties of graphene edges at different temperatures.

作者信息

Jiang Lijuan, Liu Peng, Zhang Lina, Liu Changhong, Zhang Liwei, Fan Shoushan

机构信息

Department of Physics and Electronic Engineering, Xinxiang University Xinxiang 453003 China.

State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University Beijing 100084 China

出版信息

RSC Adv. 2018 Sep 12;8(56):31830-31834. doi: 10.1039/c8ra04705g.

DOI:10.1039/c8ra04705g

PMID:35547526

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9085749/

Abstract

We have studied the effects of adsorbates on the field emission (FE) properties of graphene edges at different temperatures using Joule heating. Using infrared imaging and spectral fitting, the temperature from room temperature to about 1000 K was measured accurately. It was found that adsorption induces the deviation of graphene edge field emission from the Fowler-Nordheim law and the noise of the field emission. The adsorbates are gradually desorbed with an increase in temperature, and are almost completely desorbed above about 500 K. The FE of graphene edges without adsorption is fairly consistent with the FN theory.

摘要

我们利用焦耳加热研究了吸附质在不同温度下对石墨烯边缘场发射（FE）特性的影响。通过红外成像和光谱拟合，精确测量了从室温到约1000K的温度。研究发现，吸附会导致石墨烯边缘场发射偏离福勒-诺德海姆定律以及场发射噪声。随着温度升高，吸附质逐渐解吸，在约500K以上几乎完全解吸。未吸附的石墨烯边缘场发射与FN理论相当一致。