Light-driven thermoelectric conversion based on a carbon nanotube-ionic liquid gel composite.
Light-driven thermoelectric conversion based on a carbon nanotube-ionic liquid gel composite.
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DOI：
10.1002/cssc.200900069
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发表时间：
2009-08
期刊：
影响因子：
8.4
通讯作者：
Eijiro Miyako;Hideya Nagata;R. Funahashi;K. Hirano;T. Hirotsu
中科院分区：
文献类型：
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作者：
Eijiro Miyako;Hideya Nagata;R. Funahashi;K. Hirano;T. Hirotsu
新能源发电机的发展是解决当今能源问题的最重要组成部分之一。热电转换装置可以利用温差将热能直接转化为电能，并可作为发电机。 2]利用光能为热电装置提供动力是一种有趣的发电替代能源，并且可以在不破坏环境的情况下同时满足节能需求。低光吸收剂，例如炭黑和黑色氧化铁，通常作为光放热材料用于太阳能热驱动的热电转换系统中。纳米碳材料，如碳纳米管（CNT）、碳纳米角和富勒烯，由于其独特的物理和化学性质，在过去十年中引起了研究人员的极大兴趣。特别是，纳米碳的光热特性是各种热应用最理想的特性之一。纳米碳的光触发放热可能是由于分子振动能量导致碳原子的光刺激电子激发快速转移，从而产生热量。最近，我们证明了基于单壁碳纳米管（SWNT）-聚丙烯酰胺（PAA）水凝胶复合材料的近红外（NIR）激光驱动热电转换模块可以作为热电转换器。然而，这种纳米管热电转换系统发电能力较差。这很大程度上归因于 PAA 水凝胶的低热稳定性。福岛等人。最近报道了单壁碳纳米管 - 室温离子液体 (RTIL) 凝胶复合材料，用于电子器件和执行器。 16] RTIL，特别是基于正烷基咪唑鎓阳离子的RTIL，正在成为化学过程中使用的传统有机溶剂的替代品。这些环保溶剂具有许多有用的特性，例如高热稳定性、高离子电导率、可忽略的蒸气压和大的电化学窗口。使用 RTIL 作为光驱动热电转换器的凝胶基质很有趣； RTIL 的高热稳定性使得获得用于光驱动热电转换器的光热非常稳定的基于 CNT 的凝胶复合材料成为可能。在此，我们报告了一种基于封装单壁碳纳米管的 RTIL 凝胶复合材料的近红外激光触发热电转换系统。我们改进的基于碳纳米管的热电转换器件具有非常高的光热稳定性，应该对许多行业有用，例如机器人和航空航天工程。基于 CNT-RTIL 凝胶复合材料的光致热电转换的概念如图 1a 所示。
The development of new energy power generators is one of the most important components of the efforts that address today’s energy problems. Thermoelectric conversion devices can directly convert thermal energy into electrical energy owing to temperature differences, and can act as power generators. 2] Using light energy to power thermoelectric devices is an interesting alternative energy source for the generation of power, and can simultaneously meet the demands for energy conservation without damaging the environment. Low-light absorbents, such as carbon black and black iron oxide, are typically used in solar-heat-driven thermoelectric conversion systems as a photo-exothermic material. Nanocarbon materials, such as carbon nanotubes (CNTs), carbon nanohorns, and fullerenes, have been of great interest to researchers over the past decade because of their unique physical and chemical properties. In particular, the photothermal property of nanocarbons is one of the most desirable characteristics for a variety of thermal applications. The light-triggered exothermy of the nanocarbons probably results from the optically stimulated electronic excitations of the carbon atoms being rapidly transferred owing to molecular vibration energies, thereby causing the generation of heat. Recently, we demonstrated that a near-infrared (NIR) laser-driven thermoelectric conversion module, based on a single-walled CNT (SWNT)–polyacrylamide (PAA) hydrogel composite, can operate as a thermoelectric convertor. However, this nanotube thermoelectric conversion system was poor at generating electrical power. This was largely attributed to the low thermal stability of the PAA hydrogel. Fukushima et al. recently reported SWNT–roomtemperature ionic liquid (RTIL) gel composites for use in electronics and as actuators. 16] RTILs, especially those based on the n-alkylimidazolium cation, are emerging as alternatives to the conventional organic solvents used in chemical processes. These environmentally friendly solvents have many useful properties, such as high thermal stability, high ionic conductivity, negligible vapor pressure, and a large electrochemical window. The use of RTILs as gel matrices for lightdriven thermoelectric convertors is interesting; the high thermal stabilities of the RTILs make it possible to obtain a photothermally very stable CNT-based gel composite for a lightdriven thermoelectric convertor. Herein, we report a NIR lasertriggered thermoelectric conversion system based on RTIL gel composites encapsulating SWNTs. Our improved CNT-based thermoelectric conversion devices, which have very high photothermal stabilities, should be useful for many industries, such as robotics and aerospace engineering. The concept of photoinduced thermoelectric conversion based on a CNT–RTIL gel composite is illustrated in Figure 1 a.