Enhanced field emission from LaB6 thin films with nanoprotrusions grown by pulsed laser deposition on Zr foil

被引：39

作者：

Late, Dattatray J. ^{[1
]}

Date, Kalyani S. ^{[1
]}

More, Mahendra A. ^{[1
]}

Misra, Pankaj ^{[2
]}

Singh, B. N. ^{[2
]}

Kukreja, Lalit M. ^{[2
]}

Dharmadhikari, C. V. ^{[1
]}

Joag, Dilip S. ^{[1
]}

机构：

[1] Univ Pune, Dept Phys, Ctr Adv Studies Mat Sci & Condensed Matter Phys, Pune 411007, Maharashtra, India

[2] Raja Ramanna Ctr Adv Technol, Thin Film Lab, Indore 452013, India

来源：

APPLIED SURFACE SCIENCE | 2008年 / 254卷 / 11期

关键词：

field emission; pulsed laser deposition; LaB6; current stability; nanostructures;

D O I：

10.1016/j.apsusc.2007.11.015

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：

Lanthanum hexaboride ( LaB6) films have been deposited on a zirconium foil by pulsed laser deposition method. The field emission studies of the LaB6 deposited film have been performed in the planar diode configuration under ultra high vacuum conditions. The Fowler-Nordheim plots were found to be linear in accordance with the quantum mechanical tunneling phenomenon. A typical field emission current of 7.02 mu A was drawn at an applied electric field of 2 V/mu m. The field enhancement factor is calculated to be 8913 cm(-1), indicating that the field emission is from nanoscale protrusions present on the emitter surface. The atomic force microscope ( AFM) investigation of the surface clearly shows the conical shaped nanoprotrusions of few hundred nanometers with asperities of 20-40 nm on its top. The emission current-time plot recorded at the pre-set value of emission current of 5 mA over a period of more than 3 h exhibits an initial increase and subsequent stabilization of the current. The results reveal that the LaB6/Zr field emitter obtained by the pulsed laser deposition ( PLD) is a promising cathode material for practical applications in field emission-based devices. (C) 2007 Elsevier B. V. All rights reserved.

引用

页码：3601 / 3605

页数：5

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