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纳米荧光粉Zn₂SiO₄:Mn²⁺,Er（3+）显现潜在手印研究

Research on development of latent fingermarks using nano fluorescent powder Zn₂SiO₄:Mn²⁺,Er³⁺

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【Author】 Xiong Xiaobo;Yuan Ximin;Song Jiangqi;Wang Yongqian;Li Liu;Faculty of Materials Science and Chemistry,China University of Geosciences;Hubei Key Laboratory of Forensic Science,Hubei University of Police;

【机构】中国地质大学材料与化学学院；湖北警官学院法庭科学湖北省重点实验室；

【摘要】采用溶胶-凝胶法制备了Zn2SiO4:Mn2+,Er3+(ZSME),通过超声波处理得到粒度均匀、分散性较好的纳米粉体。将荧光粉与铁粉混合,采用磁性刷刷显不同客体上的潜在手印,采集了手印荧光光图像,与有机纳米荧光粉进行了手印显现、成像对比研究。实验结果表明:ZSME纳米荧光粉适用于非渗透性和半渗透性客体上的手印显现,其发光亮度高,可以显现出手印的第三级特征(汗孔),有效降低背景干扰,适用于背景图案复杂客体上的手印显现与成像。更多还原

【Abstract】 Nano fluorescent powder Zn2SiO4:Mn2+,Er3+(ZSME)was prepared by sol-gel method and ultrasonic dispersion.The nano fluorescent powder was introduced to development of fingermarks on non-porous and semi-porous substrates,and image of fingermarks were collected.Compared with common nano fluorescent powders,nano fluorescent powder ZSME was more applicable for detecting latent fingermarks on various substrates,including painted wood,marble,glass,phone card and leather.It was quite significant that third level could be revealed,background disturbance of substrates was effectively diminished,and high-contrast imaging was achieved using ZSME powders for fingermarks detection.更多还原