4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) is an important organic nonlinear optical material, but its applications in electronic devices are limited by its poor electrical conductivity. To tackle this problem, DAST–carbon nanotube (CNT) and DAST–graphene (G) binary composite films, as well as DAST–CNT–G ternary composite films were prepared and compared. Results indicate that both the electrical and optical properties of DAST can be effectively modified by CNT or G. Moreover, electrical percolation phenomena are observed in the DAST-based binary composite films at ~ 6.7 wt% CNT or ~ 2.0 wt% G. The as-prepared DAST–CNT films show higher electrical conductivity, while the DAST–G films exhibit higher temperature coefficient of resistance. Particularly, comprehensive optimal properties are observed in the DAST–CNT–G composite films, combining both advantages of DAST–CNT and DAST–G binary composite films, revealing the synergistic effects of CNT and G in the resultant ternary composite films.

中文翻译：

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碳纳米管与石墨烯在改性有机非线性光学材料的电和光学性质中的作用

4- N，N-二甲基氨基-4'- N甲苯磺酸甲磺基噻唑鎓盐（DAST）是一种重要的有机非线性光学材料，但其在电子设备中的应用因其导电性差而受到限制。为了解决这个问题，制备并比较了DAST-碳纳米管（CNT）和DAST-石墨烯（G）二元复合膜以及DAST-CNT-G三元复合膜。结果表明，可以通过CNT或G有效地修饰DAST的电学和光学特性。此外，在DAST基二元复合膜中，当CNT约为6.7 wt％或G约为2.0 wt％时，会观察到电渗透现象。制备的DAST–CNT膜显示出较高的电导率，而DAST–G膜显示出较高的电阻温度系数。特别是，在DAST-CNT-G复合膜中观察到了全面的最佳性能，