The Role of Oxygen at the Interface between Titanium and Carbon Nanotubes

被引：47

作者：

Felten, Alexandre ^{[1
]}

Suarez-Martinez, Irene ^{[2
]}

Ke, Xiaoxing ^{[3
]}

Van Tendeloo, Gustaaf ^{[3
]}

Ghijsen, Jacques ^{[1
]}

Pireaux, Jean-Jacques ^{[1
]}

Drube, Wolfgang ^{[4
]}

Bittencourt, Carla ^{[5
]}

Ewels, Christopher P. ^{[2
]}

机构：

[1] Univ Namur, Ctr Rech Phys Mat & Rayonnement PMR, B-5000 Namur, Belgium

[2] CNRS UMR6502, IMN, F-32229 Nantes, France

[3] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium

[4] Deutsch Elekt Synchrotron DESY, D-22603 Hamburg, Germany

[5] Univ Mons, LCIA, B-7000 Mons, Belgium

来源：

CHEMPHYSCHEM | 2009年 / 10卷 / 11期

关键词：

charge transfer; density functional calculations; nanotubes; photoemission spectroscopy; titanium; FIELD-EFFECT TRANSISTORS; ELECTRONIC-STRUCTURE; OHMIC CONTACTS; METAL; NANOPARTICLES; PHOTOEMISSION; TRANSPORT; TI;

D O I：

10.1002/cphc.200900193

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：

We study the interface between carbon nanotubes (CNTs) and surface-deposited titanium using electron microscopy and photoemission spectroscopy, supported by density functional calculations. Charge transfer from the Ti atoms to the nanotube and carbide formation is observed at the interface which indicates strong interaction. Nevertheless, the presence of oxygen between the Ti and the CNTs significantly weakens the Ti-CNT interaction. Ti atoms at the surface will preferentially bond to oxygenated sites. Potential sources of oxygen impurities are examined, namely oxygen from any residual atmosphere and pre-existing oxygen impurities on the nanotube surface, which we enhance through oxygen plasma surface pretreatment. Variation in literature data concerning Ohmic contacts between Ti and carbon nanotubes is explained via sample pre-treatment and differing vacuum levels, and we suggest improved treatment routes for reliable Schottky barrier-free Ti-nanotube contact formation.

引用

页码：1799 / 1804

页数：6

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