High electrical conductivity and n-type thermopower from double-/single-wall carbon nanotubes by manipulating charge interactions between nanotubes and organic/inorganic nanomaterials
High electrical conductivity and n-type thermopower from double-/single-wall carbon nanotubes by manipulating charge interactions between nanotubes and organic/inorganic nanomaterials
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DOI：
10.1016/j.carbon.2011.06.082
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发表时间：
2011-11-01
期刊：
影响因子：
10.9
通讯作者：
Yu, Choongho
中科院分区：
文献类型：
--
作者：
Ryu, Yeontack;Freeman, Dallas;Yu, Choongho
用有机或无机纳米材料修饰单壁和双壁碳纳米管，以获得所需的电输运性质，例如高电导率或n型热电性。例如，双壁碳纳米管（DWCNT）的电导率增加到5.9 × 10（5）S/m，并与一个大的热电势（~ 58 μ V/K），通过使用聚乙烯亚胺没有真空或受控的环境，单壁碳纳米管（SWCNT）从p型转化为n型。当用Fe和Cu无机纳米粒子修饰纳米管时，纳米管薄膜的电导随着热电势的增大而减小。另一方面，Au装饰产生了更高的电导率和更低的热电势。在DWCNT上使用F（4）TCNQ的情况下，热电功率因子提高了约180%，在SWCNT上使用Fe的情况下，热电功率因子提高了约140%。我们认为这些输运性质的变化可以归因于纳米管和纳米材料的功函数/还原电位之间的差异导致的电荷相互作用。这项研究显示了用碳纳米管合成n型和p型导体的第一步，这对热电能量转换应用至关重要。(C)2011年。爱思唯尔有限公司版权所有。
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.