期刊
CARBON
卷 49, 期 14, 页码 4745-4751出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2011.06.082
关键词
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资金
- U.S. Air Force Office of Scientific Research [FA9550-09-1-0609]
- U.S. National Science Foundation [CMMI 1030958]
- Pioneer Research Center through National Research Foundation of Korea [2011-0001645]
- Ministry of Education, Science and Technology (MEST)
- National Research Foundation of Korea [2009-0083007] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Single- and double-wall carbon nanotubes were decorated with organic or inorganic nanomaterials in order to obtain desired electrical transport properties such as a high electrical conductivity or an n-type thermopower. For instance, the electrical conductivity of double-wall carbon nanotubes (DWCNTs) decorated with tetrafluoro-tetracyanoquinodimethane (F(4)TCNQ) was increased up to 5.9 x 10(5) S/m, and single-wall carbon nanotubes (SWCNTs) were converted from p-type to n-type with a large thermopower (-58 mu V/K) by using polyethyleneimine without vacuum or controlled environment. When inorganic nanoparticles made of Fe and Cu were used for decorating nanotubes, the electrical conductance of the nanotube films was decreased with an enlarged thermopower. On the other hand, Au decorations yielded higher electrical conductances with lower thermopowers. The thermoelectric power factors were improved by similar to 180% with F(4)TCNQ on DWCNTs and similar to 140% with Fe on SWCNTs. We believe these transport property changes can be attributed to charge interactions resulted from the difference between the work functions/reduction potentials of nanotubes and nanomaterials. This study shows a first step toward the synthesis of both n-type and p-type conductors with carbon nanotubes, which are essential to thermoelectric energy conversion applications. (C) 2011. Elsevier Ltd. All rights reserved.
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