Y-TiOPc的表面活性剂修饰效应及光电导性能

Effect of Surfactant Modification on the Photoconductivity of Y-TiOPc

针对Y-酞菁氧钛(Y-TiOPc)在780 nm有高的激光光谱响应,具有极低的暗电导率,良好的化学、光化学及热稳定性而被广泛应用于高性能数码复印和激光打印机的光电导器件中,但存在溶剂诱导和机械力作用下晶型稳定性差、在有机光导(OPC)器件涂布液的分散介质中易聚集沉淀,导致分散液稳定性差而使用寿命短、OPC器件光电导性能劣化、复印和打印质量降低等严重问题,在晶型调节制备Y-TiOPc纳米粒子的过程中,采用非离子表面活性剂聚乙二醇(PEG)和司班85(Span85)对其表面进行修饰.构建有效抑制溶剂诱导和机械力作用的分子保护层,系统研究了修饰条件和修饰效果.结果表明:PEG和Span85修饰后的纳米Y-TiOPc粒度减小,在丁酮、四氢呋喃介质中机械球磨4 h以及在丁酮、四氢呋喃介质中作用30天的晶型稳定性显著改善,OPC器件涂布液静置60天的光透射率变化明显变小,分散稳定性显著改善,制备的Y-TiOPc的晶型转化率提高.用2.0%(质量分数)PEG修饰得到粒径为55.8 nm的Y-TiOPc,作为载流子产生材料制备的激光有机光电导器件显示了优异的光电导性能,V_(0)=-796 V、V_(r)=-27 V、R_(d)=11 V/s、E_(1/2)=0.125μJ/cm^(2).用2.0%(质量分数)PEG修饰的Y-TiOPc载流子产生层薄膜的粗糙度明显降低,改善了膜的平整性.研究结果为工业化制备高性能纳米Y-TiOPc提供了一个简便可行的方法.

Y-TiOPc has a high laser spectral response at 780 nm,low dark conductivity,and good chemical,photochemical,and thermal stabilities;it is also widely used in high-performance digital copying and laser printing.In the photoconductive device of the printer,Y-TiOPc has poor crystal stability under the effect of solvent-induced and mechanical forces and easily aggregates and precipitates in the dispersion medium of the coating liquid of the organic photoconductive(OPC)device,resulting in poor dispersion stability and serious problems,such as short service life,degraded photoconductive performance of OPC devices,and reduced copying and printing quality.In the process of preparing Y-TiOPc nanoparticles by adjusting its crystal form,the surface was modified with nonionic surfactants,that is,polyethylene glycol(PEG)and Span85.A molecular protective layer that effectively inhibits solvent-induced and mechanical forces was constructed,and the modification conditions and effects were systematically investigated.Results showed that the particle size of the Y-TiOPc nanoparticles modified with PEG and Span85 is reduced.The mechanical stability of ball milling in butanone(MEK)and tetrahydrofuran(THF)media for 4 h and the dispersion stability in MEK and THF media for a period of 30 days are significantly improved.The change in the light transmittance of the cloth solution left to stand for 60 days was significantly reduced,the dispersion stability was significantly improved,and the conversion rate of the prepared Y-TiOPc crystal form was improved.When modified with 2.0%(mass fraction)PEG to obtain Y-TiOPc with a particle size of 55.8 nm,the laser OPC device prepared as a carrier generation material showed excellent photoconductive performance,with V_(0)=-796 V,V_(r)=-27 V,R_(d)=11 V/s,E_(1/2)=0.125μJ/cm^(2).The roughness of the Y-TiOPc carrier generation layer film modified with 2.0%(mass fraction)PEG is significantly reduced,and the flatness of the film is improved.This research provides a simple and feasible method for the industrial preparation of high-performance Y-TiOPc nanoparticles.