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首页> 外文期刊>Advanced Functional Materials >Infiltration of regioregular poly[2,2 '-(3-hexylthiopene)] into random nanocrystalline TiO2 networks
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Infiltration of regioregular poly[2,2 '-(3-hexylthiopene)] into random nanocrystalline TiO2 networks

机译：区域规则聚[2,2'-（3-己基噻吩）]渗透到随机的纳米TiO2网络中

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摘要

Polymer infiltration into random nanocrystalline TiO2 networks is examined using a combination of imaging, surface analysis, and depth-profiling techniques. Nanocrystalline TiO2 network substrates were fabricated by established methods; the resulting networks were examined using scanning electron microscopy and found to be typical of those reported in the literature. Regio-regular poly [2,2'-(3-hexylthiopene)] (rrP3HT) was drop-cast from solution onto the TiO2-network substrates. Infiltration of the polymer into the nanoporous TiO2 network was determined by monitoring the ratio of carbon-ion signal-by means of secondary-ion mass spectrometry from a top overlayer of rrP3HT-to the carbon signal from the same polymer within the TiO2 network. A very low incorporation of polymer was found (0.5%), even for highly porous (= 65%) networks. Several strategies were used to increase the degree of polymer infiltration, including heat treatment, surface derivatization, and the use of low-molecular-weight fractions. A high of 22% rrP3HT as a percentage of the total volume of a random nanocrystalline film is reported. Previous results for hybrid rrP3HT/random nanocrystalline TiO2 network devices are examined and analyzed in the context of these findings.
机译：使用成像，表面分析和深度剖析技术的组合检查聚合物向随机纳米晶TiO2网络中的渗透。采用既定方法制备了纳米TiO2网络基体。使用扫描电子显微镜检查所得的网络，发现是文献中报道的典型网络。将区域规则的聚[2,2'-（3-己基噻吩）]（rrP3HT）从溶液中滴铸到TiO2网络基材上。通过监测来自rrP3HT顶层的碳离子信号（通过二次离子质谱法）与来自TiO2网络中相同聚合物的碳信号之比，来确定聚合物向纳米孔TiO2网络中的渗透。即使对于高度多孔的（= 65％）网络，也发现聚合物的掺入率非常低（0.5％）。采取了几种提高聚合物渗透度的策略，包括热处理，表面衍生化和使用低分子量馏分。据报道，rrP3HT占随机纳米晶体薄膜总体积的百分比高达22％。在这些发现的背景下，检查并分析了混合rrP3HT /随机纳米TiO2网络器件的先前结果。

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