Super fast detection of latent fingerprints with water soluble CdTe quantum dots

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• 作者：Kaiyang Cai^a ; Ruiqin Yang^a ; ^{rqyang66@yahoo.com.cn} ; ^{rqyang1971@yahoo.com} ; Yanji Wang^a ; Xuejiao Yu^b ; Jianjun Liu^b
• 关键词：Super fast detection ; Latent fingerprint ; CdTe ; Quantum dots
• 刊名：Forensic Science International
• 出版年：2013
• 出版时间：10 March, 2013
• 年：2013
• 卷：226
• 期：1-3
• 页码：240-243
• 全文大小：659 K

文摘

A new method based on the use of highly fluorescent water-soluble cadmium telluride (CdTe) quantum dots (QDs) capped with mercaptosuccinic acid (MSA) was explored to develop latent fingerprints. After optimized the effectiveness of QDs method contains pH value and developing time, super fast detection was achieved. Excellent fingerprint images were obtained in 1-3 s after immersed the latent fingerprints into quantum dots solution on various non-porous surfaces, i.e. adhesive tape, transparent tape, aluminum foil and stainless steel. High sensitivity of the new latent fingerprints develop method was obtained by developing the fingerprints pressed on aluminum foil successively with the same finger. Compared with methyl violet and rhodamine 6G, the MSA-CdTe QDs showed the higher develop speed and fingerprint image quality. Clear image can be maintained for months by extending exposure time of CCD camera, storing fingerprints in a low temperature condition and secondary development.