利用CdSe巯基乙酸溶液显现水浸客体表面潜手印
2011-09-26杨瑞琴汪超
杨瑞琴,汪超
(中国人民公安大学刑事科学技术系,北京100038)
利用CdSe巯基乙酸溶液显现水浸客体表面潜手印
杨瑞琴,汪超
(中国人民公安大学刑事科学技术系,北京100038)
目的研究水浸客体表面潜指纹的显现方法;方法利用CdSe巯基乙酸溶液显现被水浸泡过的黄色封箱胶带、黑色塑料袋、玻璃等常见非渗透性客体上的潜手印,讨论影响水浸非渗透性客体上潜手印显现效果的各种因素,并与传统方法进行比较,初步探讨了CdSe巯基乙酸溶液显现水浸非渗透性客体表面潜手印的方法;结果使用巯基乙酸包覆CdSe纳米复合材料显现潜在手印,使每分子纳米复合材料外表包覆足够数量的羧基,则可以提高它同手印残留物的结合能力,从而得到更高清晰度、更高分辨率的手印显像;结论巯基乙酸包覆CdSe纳米复合材料可以很好的显现水浸塑料、胶带等表面潜指纹。
纳米CdSe;水浸非渗透性客体;潜手印;显现
Abstract:Objective To establish a method for developing latent fingerprints on wet surfaces.Methods CdSe mercapto acetic acid was used to develop latent fingerprint on wet and nonporous surfaces such as yellow sealing tape,black plastic bag,glass and so forth.The impact factors in developing fingerprints on these objects were discussed and the effects between the traditional method and CdSe materials were comparied.Results Carboxyl encapsulated nano materials enhanced the reaction activity between CdSe and fingerprint residues.So clear and high resolution fingerprint images could be got easily.Conclusion Latent fingerprints on wet and nonporous surfaces could be developed by CdSe mercaptoacetic acid.
Key words:nano CdSe solution;wet and nonporous object;latent fingerprint;development
作案现场常被犯罪嫌疑人用水冲洗,与犯罪有关的物体如犯罪工具、碎尸案中的塑料包装物等常被雪雨淋湿或被水冲洗和浸泡,水浸非渗透性客体表面潜手印显现一直被刑事技术领域视为一大疑难。实践中显现水浸非渗透性客体的常规方法——小微粒悬浮液是一种以金属氧化物为基础的悬浮液[1-3]。二硫化钼悬浮液法以及四氧化三铁悬浮液法等也可用于水浸非渗透性客体表面潜手印的显现。但由于小颗粒悬浮液浓度较大,颗粒与手印残留物结合的程度一般,陈旧性手印的显现效果不好。……
