Free-Standing Single-Molecule Thick Crystals Consisting of Linear Long-Chain Polymers
Free-Standing Single-Molecule Thick Crystals Consisting of Linear Long-Chain Polymers
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由线性长链聚合物组成的独立单分子厚晶体
DOI：
10.1021/acs.nanolett.6b04896
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发表时间：
2017
期刊：
影响因子：
10.8
通讯作者：
Li Ming
中科院分区：
文献类型：
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作者：
Liu Renwei;Fan Suna;Xiao Dongdong;Zhang Jin;Liao Mengzhou;Yu Shansheng;Meng Fanling;Liu Baoli;Gu Lin;Meng Sheng;Zhang Guangyu;Zheng Weitao;Hu Shuxin;Li Ming
有机二维(2D)晶体对未来器件的发展具有重要意义。尽管超过一半的人造产品含有聚合物，但由长线性链组成的2D晶体仍有待探索。在这里，我们报道了通过合理的电化学聚合和液相剥离制备二维聚苯胺(PANI)晶体。二维PANI分子很薄(∼为0.8 nm)，由数均相对分子质量为∼31 000的PANI链组成。这些链彼此平行，苯环几乎垂直于表面，这意味着相邻的链通过丰富的π-π相互作用以及氢键的增强而面对面地排列在一起。二维PANI可以很容易地转移到各种固体表面，并显示出有趣的电学和光学性质，这表明它们在光电子器件和其他应用中具有潜在的应用价值。
Organic two-dimensional (2D) crystals are fundamentally important for development of future devices. Despite that more than a half of man-made products contain polymers, 2D crystals consisting of long linear chains have yet to be explored. Here we report on the fabrication of 2D polyaniline (PANI) crystals via rational electrochemical polymerization followed by liquid-phase exfoliation. The 2D PANI is molecularly thin (∼0.8 nm) and composed of PANI chains with a number-average molecular weight of ∼31 000. The chains are parallel to each other with the benzene rings standing almost vertically to the surface, implying a face-to-face arrangement of the neighboring chains held together by abundant π–π interactions augmented with hydrogen bonds. The 2D PANI can be readily transferred to various solid surfaces and exhibit interesting electrical and optical properties, suggesting that they would be potentially useful in photoelectronic devices and other applications.