A simple chemical synthesis of amorphous carbon nanotubes-MnO2 flake hybrids for cold cathode application

被引：20
作者：
Sarkar, Sourav [1 ]
Banerjee, Diptonil [2 ]
Das, Nirmalya Sankar [2 ]
Chattopadhyay, Kalyan Kumar [1 ,2 ]
机构：
[1] Jadavpur Univ, Dept Phys, Thin Film & Nanosci Lab, Kolkata 700032, India
[2] Jadavpur Univ, Sch Mat Sci & Nanotechnol, Kolkata 700032, India
来源：
APPLIED SURFACE SCIENCE | 2015年 / 347卷
关键词：
Amorphous carbon nanotube; Composite materials; Nano structured materials; Field emission; Tunneling; FIELD-EMISSION PROPERTIES; MNO2/CNT NANOCOMPOSITE; HYDROTHERMAL SYNTHESIS; NANOPARTICLES;
D O I：
10.1016/j.apsusc.2015.04.025
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A simple approach has been implemented to synthesize amorphous carbon nanotubes (a-CNTs) and manganese oxide (MnO2) hybrid nanostructure at temperature as low as similar to 250 degrees C in open atmosphere. Microscopic studies of the samples revealed that the walls of the a-CNTs were coated uniformly by MnO2 nanoflakes. The composition of the as prepared sample was studied with the help of energy dispersive Xray and X-ray photoelectron spectroscopy. Electron field emission study was done in a custom built high vacuum field emission setup for the prepared a-CNT and manganese oxide (MnO2) hybrid nanostructure. It is seen that the performance of the a-CNTs as cold cathode emitter has been enhanced greatly when MnO2 nanoflakes were coated uniformly over it. The turn on field has been reduced from 7.17 to value a slow as 3.82 V/mm with enhancement factor increases from 2428 to 6965. Finite element based simulation study theoretically confirms the enhancement of field emission properties of as prepared MnO2 nanoflake coated a-CNTs. The results have been explained due to enhanced surface roughness leading to higher enhancement factor and overall increase of emission sites. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：824 / 831
页数：8
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