Journal
ANALYTICA CHIMICA ACTA
Volume 812, Issue -, Pages 228-235Publisher
ELSEVIER
DOI: 10.1016/j.aca.2014.01.015
Keywords
Fingerprints; Fluorescent nanoparticles; Log-normal model; Nonlinear fitting; Quantum dots
Categories
Funding
- Ciencia 2007 program (FCT-Portugal)
- FCT [E-15/11]
- MCINN [AIB201OPT-00299]
- Ministry of Education, Science and Technology of the Republic of Serbia [173017]
- Spanish Ministry of Economy and Competitivity [CTQ2012-37925-C03-03]
- University of Malaga
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A fluorescent nanocomposite based on the inclusion of CdSe quantum dots in porous phosphate heterostructures, functionalized with amino groups (PPH-NH2@CdSe), was synthesized, characterized and used for fingerprint detection. The main scopes of this work were first to develop a friendly chemical powder for detecting latent fingerprints, especially in non-porous surfaces; their further intercalation in PPH structure enables not to spread the fluorescent nanoparticles, for that reason very good fluorescent images can be obtained. The fingerprints, obtained on different non-porous surfaces such as iron tweezers, mobile telephone screen and magnetic band of a credit card, treated with this powder emit a pale orange luminescence under ultraviolet excitation. A further image processing consists of contrast enhancement that allows obtaining positive matches according to the information supplied from a police database, and showed to be more effective than that obtained with the non-processed images. Experimental results illustrate the effectiveness of proposed methods. (C) 2014 Elsevier B.V. All rights reserved.
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