期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 245, 期 10, 页码 2239-2242出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.200879609
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资金
- IFW Dresden
- Czech Ministry of Education Youth and Sports [LC-510]
- Academy of Sciences of the Czech Republic [IAA 400400804, KAN 200100801]
- U.S. Army Telemedicine and Advanced Technology Research Center [DAMD17-05-1-0381]
- U.S. National Science Foundation [EEC-0647560, DMR-0706067]
An in-situ optical Vis/NIR spectroelectrochemistry study was performed on single-walled carbon nanotubes (CoMoCat) enriched with (6,5) tubes via density-gradient ultracentrifugation. Thin semitransparent solid films were prepared from the solution of sorted nanotubes by vacuum filtration and purification with water. Despite the appearance of some bundling of the nanotubes during this procedure, peaks corresponding to optical transitions of tubes with distinct chiralities may be observed in the spectra. The effects of electrochemical redox doping on the electronic state of the nanotubes were investigated in an electrode potential window between -2 and +1.7 V vs. Ag-pseudoreference electrode. The bleaching of Delta E-11(S) and Delta E-22(S) optical transitions is traced for particular tubes, which allows a partial quantification of changes in the electronic density of states (DOS) caused by their filling with electrons or holes. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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