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首页> 外文期刊>Synthetic Metals >Structure and properties of the highly conductive Langmuir-Blodgett films based on ditetradecyldimethylammonium-Au(dmit)(2) salt
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Structure and properties of the highly conductive Langmuir-Blodgett films based on ditetradecyldimethylammonium-Au(dmit)(2) salt

机译：基于双十四烷基二甲基铵-Au（dmit）（2）盐的高导电Langmuir-Blodgett膜的结构和性能

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摘要

The Langmuir-Blodgett (LB) film based on ditetradecyldimethylammonium-Au(dmit)(2) (dmit =1,3-dithiol-2-thione-4,5-dithiolate) [2C(14)N(+)Me(2)-Au(dmit)(2)] salt exhibits a high room-temperature conductivity of 40 S/cm (4.0 x 10(3) S/m) after electro-oxidation. Since the optical transmittance of the 20-layered LB film is more than 80 % in the whole visible region, the thin-film system attracts much attention both from the technological and scientific point of views. Although the electro-oxidation plays a key role to realize the high conductivity, the induced changes in structure and properties of the film had not been fully elucidated. Here we present a comprehensive study on the structure and properties of the 2C(14)N(+)Me(2)-Au(dmit)(2) LB film utilizing UV-visible spectroscopy, FT-IR spectroscopy, AFM and XRD. The oxidation of the Au(dmit)(2) anions solely proceeds in the earlier stage, while the anion oxidation and a morphological change proceed simultaneously in the later stage. Associated with the electro-oxidation, a broad band appears in a wide IR region and the change in the spectral weight [Delta integral Adk(cm(-1))] coincides well with the conductance indicating that conduction electrons are generated by the charge transfer. The order of the hydrocarbon chains improves by the electro-oxidation. The as-deposited film consists of insulating domains with d = 3.2 nm, while the insulating domains with d = 3.2 nm and highly conductive domains with d = 2.9 nm coexist in the electro-oxidized film. The heterogeneity is considered to be the origin of the percolation-type conduction. (C) 2015 Elsevier B.V. All rights reserved.
机译：基于二十四烷基二甲基铵-Au（dmit）（2）（dmit = 1,3-dithiol-2-thione-4,5-dithiolate）的Langmuir-Blodgett（LB）膜[2C（14）N（+）Me（2 ）-Au​​（dmit）（2）]盐在电氧化后具有40 S / cm（4.0 x 10（3）S / m）的高室温电导率。由于20层LB膜在整个可见光区域的透光率均超过80％，因此从技术和科学角度来看，薄膜系统都引起了广泛关注。尽管电氧化在实现高电导率方面起着关键作用，但是尚未完全阐明膜的结构和性能引起的变化。在这里，我们对2C（14）N（+）Me（2）-Au（dmit）（2）LB膜的结构和性能进行全面研究，利用紫外可见光谱，FT-IR光谱，AFM和XRD。 Au（dmit）（2）阴离子的氧化仅在较早阶段进行，而阴离子氧化和形态变化在较后阶段同时进行。与电氧化相关，宽谱带出现在较宽的IR区域中，光谱权重[Δ积分Adk（cm（-1））]的变化与电导率非常吻合，表明通过电荷转移产生了导电电子。烃链的顺序通过电氧化而改善。沉积后的膜由d = 3.2 nm的绝缘区域组成，而d = 3.2 nm的绝缘区域和d = 2.9 nm的高导电区域共存于电氧化膜中。异质性被认为是渗滤型传导的起源。 （C）2015 Elsevier B.V.保留所有权利。

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