Non-linear electronic transport in Pt nanowires deposited by focused ion beam

被引：20

作者：

Penate-Quesada, L. ^{[1
]}

Mitra, J. ^{[1
]}

Dawson, P. ^{[1
]}

机构：

[1] Queens Univ Belfast, Ctr Nanostruct Media, IRCEP, Belfast BT7 1NN, Antrim, North Ireland

来源：

NANOTECHNOLOGY | 2007年 / 18卷 / 21期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0957-4484/18/21/215203

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Electrical transport and structural properties of platinum nanowires, deposited using the focused ion beam method, have been investigated. Energy dispersive x-ray spectroscopy reveals metal-rich grains ( atomic composition 31% Pt and 50% Ga) in a largely non-metallic matrix of C, O and Si. Resistivity measurements ( 15 - 300 K) reveal a negative temperature coefficient with the room-temperature resistivity 80 - 300 times higher than that of bulk Pt. Temperature-dependent current - voltage characteristics exhibit non-linear behaviour in the entire range investigated. The conductance spectra indicate increasing non-linearity with decreasing temperature, reaching 4% at 15 K. The observed electrical behaviour is explained in terms of a model for inter-grain tunnelling in disordered media, a mechanism that is consistent with the strongly disordered nature of the nanowires observed in the structure and composition analysis.

引用

页数：5

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