Fingerprint detection and using intercalated CdSe nanoparticles on non-porous surfaces

• Fluorescent nanocomposite based on the inclusion of CdSe quantum dots in porous phosphate heterostructures.
• Characterized by FTIR, XRD and fluorescence spectroscopies.
• Deconvolution of the emission spectra was confirmed by using multivariate curve resolution (MCR) method.
• Application for fingerprint detection and analysis on different non-porous surfaces.

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.

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