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CAI Kai-yang, YANG Rui-qin, WANG Yan-ji. Development of latent blood fingerprints by water-soluble CdTe quantum dots[J]. Forensic Science and Technology,2012,37(5): 6-8
Development of latent blood fingerprints by water-soluble CdTe quantum dots
CAI Kai-yang, YANG Rui-qin, WANG Yan-ji
Chinese People's Public Security University, Beijing 100038,China
Abstract
Objective To explore a new method for developing latent blood fingerprints with the water-soluble cadmium telluride quantum dots on various surfaces.Methods Blood fingerprints were treated with quantum dots in aqueous solution and fluorescence images were obtained under 365nm UV light.Results The develop time was less than other QDs methods reported before. Compared to TMB and acid black 10B, excellent improvement of image quality and sensitivity were also obtained.Conclusion The water-soluble cadmium telluride quantum dots method can be used to detect blood fingerprints on various surfaces.
A. Becue, S. Moret, C. Champod. Use of Quantum Dots in Aqueous Solution to Detect Blood Fingermarks on Non-Porous Surfaces[J]. Forensic Science International, 2009, 191: 36-41. [本文引用:1]
Water-soluble fluorescent CdSe quantum dots(QDs) were synthesized using thiolglycolic acid(TGA) as the stabilizer and characterized by fluorescence spectroscopy. The material exhibited strong visible fluorescence under excitation at 365 nm. QDs were applied to label blood fingerprints deposited on non-porous surfaces. Then fluorescent images of fingerprints were obtained by the charge-coupled device(CCD) camera. The effects of labeling time,blood concentration and stored time of blood fingerprints to imaging were investigated. The results showed that the fluorescent images could be obtained within labeling time of 30 min. CdSe QDs can detect blood fingerprints on different surfaces especially on black surface; 1% diluted blood fingerprints also could be labeled. The labeled blood fingerprints have higher and stable fluorescence intensity, weaker background interference and better contrast between fingerprints and substrate. CdSe QDs are promising reagents for blood fingerprints development on non-porous dark surfaces.
(1.Department of Forensic Science,Chinese People′s Public Security University,Beijing 100038; 2.College of Science,Beijing University of Chemical Technology,Beijing)