四苯基卟啉锌-单壁碳纳米管复合薄膜的制备与光电特性研究

Preparation and Optoelectronic Properties of Zinc Tetraphenyl Porphyrin-Signle Walled Carbon Nanotube Composite Films

使用喷涂法制备了四苯基卟啉锌(ZnTPP)薄膜及ZnTPP-单壁碳纳米管复合薄膜。采用金相显微镜、扫描电子显微镜、台阶仪、四探针测试仪、紫外-可见光分光光度计、傅里叶红外光谱仪对薄膜的形貌、电学及光学性能等进行了系统的测量,研究了ZnTPP薄膜及ZnTPP-碳纳米管复合薄膜的太赫兹响应特性。结果表明,ZnTPP的太赫兹指纹谱峰为44,57,77,88,95和102cm-1,与文献[3]报道的棕树叶中叶绿素的指纹谱峰基本一致。重要的是,通过与碳纳米管相复合的方法,不仅使ZnTPP有机薄膜的均匀性及致密性得到了改善,还使后者的导电性及在紫外到太赫兹波段的光吸收性能获得明显增强。此外,还发现了复合薄膜在47及66cm-1处出现新的太赫兹吸收峰,证明了碳纳米管和ZnTPP之间存在的相互作用。这种作用使复合薄膜的综合性能得到提高。结果表明,通过加入碳纳米管,能够对ZnTPP的薄膜质量以及电学和光学性能等进行有效的改善,使之具有综合优良的物理性能、具备光电器件的应用前景。研究成果对促进有机物的太赫兹光谱研究以及寻找新型太赫兹有机敏感材料等具有重要意义。

In this work,Zinc tetraphenyl porphyrin（ZnTPP）films and ZnTPP-carbon nanotube（CNT）composite films were successfully prepered by spray coating.The morphologies,electrical and optical properties of the as-prepared materials were systematically investigated by metalloscope,scanning electron microscopy（SEM）,profilometer,resistance meter,UV-Vis,and Fourier transform infrared spectroscopy（FTIR）,respectively.Results revealed that the THz fingerprint peaks of ZnTPP at 44,57,77,88,95 and 102cm-1 were similar with those of chlorophyll in palm leaves（Ref.[3]）.Importantly,not only the uniformity and compactness of the ZnTPP films,but also their electrical conductivity and optical responses in a broad area from ultraviolet to terahertz were significantly enhanced after the addition of CNTs to ZnTPP.Moreover,new THz absorption peaks at 47 and 66cm-1 were detected after the composite formation,suggesting strong interactions between ZnTPP and CNTs which led to the improvement of the comprehensive properties of the composite films.These results demonstrate that the electrical and optical properties of ZnTPP can be effectively modified by CNTs,and by which the comprehensive properties can be achieved,thus,the requirements of optoelectronic devices can be met.The results in this work will be helpful for promoting the study on the terahertz spectra of the organics as well as seeking new terahertz organic sensitive materials in the future.