9-乙基-3-咔唑亚甲基α-苯基-苯腙的合成

以咔唑和二苯胺为原料 ,经烷基化、甲酰化、亚硝基化、还原、缩合 5步反应合成了 9 乙基 3 咔唑亚甲基 α 苯基 苯腙 ,总收率 38 7%。产物结构由红外光谱、核磁共振谱和元素分析进行了确认。在甲酰化反应中采用二甲基甲酰胺代替N 甲基甲酰苯胺为甲酰化试剂 ,具有无毒、价廉、易得等优点。该化合物作为一种电荷传输材料 ,在近红外区 ( 780nm)光半衰灵敏度为 4lx·s。     

非本征条件下N型HgCdTe光导探测器的厚度选择

分析了N型HG面空间电荷层中的表面电势的变化情况,计算了Auger复合寿命及光导器件的探测率,讨论了表面电荷密度、表面附合速率及器件厚度对探测器性能的影响。结果表明,在非本征条件下,对N型HgCdTe光导探测器,当表面附合速率及表面电荷密度确定后,对器件探测率存在一最优厚度。     

光导管暗电阻时间漂移特性的动态补偿

为了消除光导管暗电阻时间漂移特性对测量结果造成的影响,提出了一种动态补偿方法。将该方法应用于对红外水分仪中PbS光导管的输出信号进行即时修正,较好地克服了PbS光导管暗电阻时间漂移特性的影响。本文所介绍的动态补偿法,原理简单易行,对提高检测系统的稳定性和精确度具有明显的技术应用价值。     

静电复印用感光材料的研究进展

综述了感光材料的基本要求及其研究发展过程，重点介绍了OPC感光材料和α-Si光导材料，但α-Si光导材料的生产工艺和成本问题有待解决。研究开发这两种材料是今后的方向。     

Enhanced ultraviolet sensitivity of zinc oxide nanoparticle photoconductors by surface passivation

Zinc oxide nanoparticles were created by a top-down wet-chemical etching process and then coated with polyvinyl-alcohol (PVA), exhibiting sizes ranging from 10 to 120 nm with an average size approximately 80 nm. The PVA layer provides surface passivation of zinc oxide nanoparticles. As a result of PVA coating, enhancement in ultraviolet emission and suppression of parasitic green emission is observed. Photoconductors fabricated using the PVA coated zinc oxide nanoparticles exhibited a ratio of ultraviolet photo-generated current to dark current as high as 4.5 × 10⁴, 5 times better than that of the devices fabricated using uncoated ZnO nanoparticles.     

The modification of electrophotographic and mechanical properties of organic photoconductors by ultra-violet irradiation

Experiments have shown that UV treatment has a hardening effect on the surface of a drum-based organic photoconductor (OPC) and improves the retentivity. The dark decay and the photoinduced discharge rates were reduced linearly with the increase of time of UV irradiation. The dark decay rate and photoinduced discharge rates were reduced to 60% and more than 70% of the initial rate, respectively, while there was an increase of the activation energy of the charge transport layer. An initial increase in the residual potential was also observed from 20 to about 70 V. After 40 min of UV irradiation, the residual potential was seen to drop to 50 V again, and at the same time a slight increase of the hardness of the photoreceptor surface was detected from 13 to 16 in Vickers scale (Hv). The phenomena is most likely explained by a photochemical change which reduces the density of charge transport sites, builds up the number of deep traps and changes the molecular distribution. The decrease in charge transport site density and buildup of deep traps reduces the conductivity and hence the dark decay and photoinduced discharge rates. The fragmentation of charge transport molecules may result in a change of activation energy as well as the increase in the residue potential. Moreover, the redistribution of molecules leads to the change in molecular density and hardness.     

Electrical properties of naphthyl polyenes

Dark and photoconductive properties ofα-ω-di-2-naphthyl polyenes were studied at different applied voltages and temperatures. These studies indicate that a single dominant trapping level is involved in both conduction processes. From this study some transport parameters are evaluated. Dependence of photocurrent on excitation light intensity indicates that the carrier generation process is a one-photon process and is trap-limited. The photocurrent decay study indicates that most of the photocarriers decay exponentially with time. Trap depths are calculated from the temperature dependence of decay constant and is found to be the same as that obtained from thermally stimulated current. The dependence of photocurrent on wavelength indicates two mechanisms of photocarrier generation process: one is excitonic and the other is intrinsic electron-hole pair production.     

膜蒸馏原理在酞菁化合物结晶过程中的应用

介绍了运用膜蒸馏的基本原理来实现酞菁氧钛（ＴｉＯＰｃ）晶型转变的方法，用该方法制得的χ２型酞菁氧钛具有比其它晶型ＴｉＯＰｃ更为优越的光导性能     

Blumlein型高效率微带光导开关研究

提出了一种高效率Ｂｌｕｍｌｅｉｎ型微带光导开关电路．并从理论上分析了该光导开关电路的输出特性和不同光功率激励下的工作特点．分析指出这种光导开关具有１００％的电压转换效率。实验结果得到了９３％的电压转换效率．和理论分析结果相吻合。     

3,6-双(二苯胺基)-9-乙基咔唑的合成

以咔唑为原料 ,经碘代、N 烷基化、取代三步反应合成了 3,6 双 (二苯胺基 ) 9 乙基咔唑(Ⅲ )。咔唑与ICl按 m(咔唑 )∶ m(ICl) =1∶2 ,在 80℃进行碘代 ,反应 3h ,制取了 3,6 二碘代咔唑 (Ⅰ ) ,产率 6 1% ;中间产物Ⅰ与溴乙烷按m (Ⅰ )∶V(C2 H5Br) =8 5g∶2 5mL ,以DMSO为溶剂 ,在过量固体KOH存在下 ,80℃ ,反应 2h ,制备了 3,6 二碘代 9 乙基咔唑 (Ⅱ ) ,产率 40 % ;中间产物Ⅱ与二苯胺在铜粉和K2 CO3 催化剂存在下 ,m (Ⅱ )∶m (铜粉 )∶m (K2 CO3) =2 9∶0 2∶1 5 ,以硝基苯为溶剂 ,在 2 0 8℃回流 10h ,合成了最终产物Ⅲ ,产率 70 %。