• Mutavdzic, D.
• Radotic, K.
• Rodriguez Castellon, E.
• Esteves Da Silva, Jcge
• Jimenez Jimenez, J.
• Savic, A.
• Kalauzi, A.
• Jose Guerrero Gonzalez, Jj
• Algarra, M.

Abstract

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.

Topics

• nanoparticle
• porous
• nanocomposite
• surface
• inclusion
• iron
• quantum dot
• luminescence