A New Solvent-free Preparation Approach for Nano β-Form Oxytitanium Phthalocyanine with High Crystallinity and Photoconductive Properties

In this paper, a new solvent-free crystal phase transformation approach for fabrication of nano β-form oxytitanium phthalocyanine （TiOPc） with high crystallinity and excellent photoconductive properties is reported. The amorphous TiOPc powder is transformed to nano-β-TiOPc by the thermal-induction under a certain temperature in a simple way. According to the research of a series of conditions related to the thermal process, we get nice nano-β-TiOPc whose crystallinity is higher than 97% at 300 ℃ for annealing 2 hours. The morphology of nano-β-TiOPc is studied by SEM and TEM. Laser organic photoconductors doped β-TiOPc as the charge generation material are prepared to detect their photoelectric performance, and the results show decent photoconductive properties.

无溶剂热致转型制备多晶型无金属酞菁光导材料及性能研究

研究了一种新型无溶剂法进行晶型转化以获得具有良好光敏性能的α及β型无金属酞菁(H_2Pc)的方法。以1,3-二亚氨基异吲哚啉缩合成环得到H_2Pc,经酸糊提纯后得到低结晶度的α-H_2Pc。通过对其热致转型温度的研究发现,190℃下保温2 h可以得到结晶度为100%的α-H_2Pc,而在高于275℃的温度下保温2 h则可以获得结晶度为95.04%的β-H_2Pc。对制备的2种晶型的H_2Pc的形貌进行了表征,可以观测到H_2Pc逐渐由不规则片层状结构生长为棒状结构。将其作为电荷产生材料制备有机光导体器件测试其光导性能,α-H_2Pc可获得0.609μJ·cm-2的光敏性而β-H_2Pc可获得0.420μJ·cm-2的光敏性。结果表明,建立的H_2Pc的晶型转化方法具有简便、环境友好、可连续制备α和β2种晶型产物,且光导性能优良的特点,可广泛应用于中高速激光有机光导体的制备。