单分散微/纳米卤化银乳剂的光吸收特性研究——立方体乳剂和氯化银{100}面扁平颗粒乳剂  

Light Absorption Properties of Monodispersed Micron/Nano-sized Silver Halide Emulsions: Cubic Silver Halide and AgCl {100} T-grain

作　　者：李智[1] 郑彤[1] 彭必先[1] 陈丽娟[1] LI Zhi;ZHENC Tong;PENG Bi-Xian;CHEN Li—Juan(Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100101)

机构地区：[1]中国科学院理化技术研究所,北京100101

出　　处：《化学学报》2006年第9期833-838,共6页Acta Chimica Sinica

摘　　要：重点研究了系列立方体乳剂和氯化银{100}面T-颗粒乳剂的光吸收特性.通过调变乳剂制备的各项参数,成功地制备了系列立方体卤化银乳剂及氯化银{100}面扁平颗粒乳剂.经过TEM和SEM进行观察,统计颗粒的形貌、粒径,确定系列立方体乳剂微晶的粒径分别为:80,150,600nm;得到的氯化银{100}面扁平颗粒乳剂微晶的等效粒径为1400nm,且形态比不小于7.经过对明胶-乳剂层和片基的反射和透射光谱测试,计算了不同形貌、不同粒径AgCl(Br)乳剂体系的光吸收系数,比较了相对光吸收能量.实验发现:纳米级卤化银立方体的光吸收在可见光谱区始终保持有较高值,主要吸收峰与其它颗粒相比明显发生了红移;氯化银{100}面T-颗粒乳剂在本征吸收区及可见光区域都有独特的光吸收性能.A silver chloride{100}T-grain emulsion and a series of cubic silver halide emulsions were prepared by varying the parameters correctly during nucleation and growing processes of grains.After the observation of SEM and TEM,following statistical data were obtained:the diameters of the cubic microcrystal are 80,150,600 nm respectively,the equivalent circular diameter(ECD)of the{100}tabular microcrystal is 1400 nm and the shape ratio(ratio of ECD to thickness of a grain)is not less than 7.The absorbencies and the relative absorbed energy of the emulsions were calculated and then compared with each other.It can be easily found that the nano-sized AgX microcrystal retained the high light absorption in visible light region and obtained a red shift of its peak,and the absorbance of the AgCl{100}T-grain emulsion was also particular.

关 键 词：氯化银乳剂 纳米尺度 {100}面扁平颗粒 立方体颗粒 光吸收 

分 类 号：TQ571[化学工程—精细化工]