【摘要】 采用纳米硫化铅作为增感剂对边长为0．8μm的溴化银立方体颗粒进行了化学增感．利用微弱信号的微波吸收相敏检测技术,在超短脉冲激光作用下,获得了立方体溴化银乳剂中自由光电子和浅束缚光电子随增感时间变化的衰减曲线．通过测量溴化银光作用过程的时间分辨谱,讨论了卤化银晶体中电子陷阱对光电子运动行为的影响,分析了电子陷阱效应同增感时间之间的关系以及两个一级衰减区间寿命值同增感时间的关系．通过未增感样品与增感样品的衰减曲线对比,得到了在此实验条件下的最佳增感时间为60 min．更多还原

【Abstract】 PbS nanoparticales as a sensitizer is added to the 0.8 μm cubic silver bromide emulsion for the chemical sensitization. Under illuminated by pulse laser, the decay characteristics of free photo-electrons and shallow-trapped electrons in the cubic silver bromide emulsion sensitized by PbS nanoparticales with the continuous increase of sensitization time are obtained by using the microwave absorption and dielectric spectrum measure technique. The influence of electron traps in silver bromide microcrystal, on the behavior of the photoelectron’ s movement is discussed. The relationship between the effects of electron traps and sensitization time is analyzed. By the contrast of the decay characteristics between the unsensitized sample and the sensitized samples, the optimum sensitizing-time on this experiment condition is 60 min.更多还原