Electrochemical purification of carbon nanotube electrodes

被引：30

作者：

Heras, Aranzazu ^{[2
]}

Colina, Alvaro ^{[2
]}

Lopez-Palacios, Jesus ^{[2
]}

Ayala, Paola ^{[3
]}

Sainio, Jani ^{[1
]}

Ruiz, Virginia ^{[1
]}

Kauppinen, Esko I. ^{[1
,4
]}

机构：

[1] Aalto Univ, Dept Appl Phys, FI-02015 Espoo, Finland

[2] Univ Burgos, Dept Quim, E-09001 Burgos, Spain

[3] Univ Vienna, Fak Phys, A-1090 Vienna, Austria

[4] VTT Biotechnol, FI-02044 Espoo, Finland

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 07期

基金：

芬兰科学院;

关键词：

Single-walled carbon nanotubes; Electrochemical purification; Optically transparent electrodes; Spectroelectrochemistry; NANOPARTICLES; IMPURITIES;

D O I：

10.1016/j.elecom.2009.05.052

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We present a fast and effective electrochemical method to purify random networks of single-walled carbon nanotubes (SWCNTs) that leads to total removal of metal catalyst without apparent detrimental effect on the electrochemical properties of the electrodes. The efficiency of the electrochemical purification has been compared with that of conventional chemical purification (acid washing). The disappearance of the peaks corresponding to the electrochemical redox reactions of iron during electrochemical purification evidences removal of iron impurities. The efficiency of electrochemical cleaning is further corroborated by cyclic voltammetry (CV) of an iron-sensitive electrochemical reaction, hydrazine oxidation. X-ray photoelectron spectroscopy also indicates that no iron can be detected after electrochemical purification whereas some iron is still left after acid washing. Moreover, Raman spectroscopy reveals higher degree of SWCNT damage after chemical purification compared to the electrochemical one. Electrochemically purified and pristine SWCNT electrodes exhibit similar conductivity, electrochemistry and performance as optically transparent electrodes for an iron-insensitive redox probe, Ru(bipy)(3)(3./2.). (c) 2009 Elsevier B.V. All rights reserved.

引用

页码：1535 / 1538

页数：4

共 14 条

[1] Carbon nanotubes contain metal impurities which are responsible for the "electrocatalysis" seen at some nanotube-modified electrodes [J].