Effects of Metallic Ions on Photoluminescence Properties of CdSe/PAMAM Nanocomposites and their Application in Fingerprint Detection

Abstract:

Uniform and well-dispersed photoluminescent semiconductor CdSe(Cadmium selenium) QDs(Quantum dots) were in-situ prepared stabilized by G4.0-NH₂ PAMAM dendrimers in water and effects of metallic ions such as Zn²⁺, Cd²⁺, Cu²⁺, Ag⁺, Pb²⁺, K⁺, Na⁺ on the photoluminescence(PL) properties of CdSe QDs were studied using spectrophotometric titration. The results show that Zn²⁺ and Cd²⁺ ions enhance the PL intensity of CdSe QDs, Cu²⁺, Ag⁺ and Pb²⁺ ions quench the PL intensity, while K⁺ and Na⁺ ions have no obvious effects. Those are attributed to the surface modification of CdSe QDs. Excess Cd²⁺ ions can reduce the non-combination centers, increase the passivation of PAMAM on the surface of CdSe QDs, and form a Schottky-like barrier which enhanced the PL efficiency. Excess Zn²⁺ ions can also increase the PL intensity of CdSe QDs in the same way as Cd²⁺ ions because of the much similar lattice parameters of CdSe and ZnSe. However, a CuSe, Ag₂Se or PbSe shell on CdSe QDs emerges due to the substitution of Cd²⁺ ions, which leads to the decrease of band-edge emmiting of CdSe QDs. And the quenching effect of Ag⁺ is stonger than Cu²⁺ and Pb²⁺ because of the lower solubility of Ag₂Se formed on the surface of CdSe QDs. Oil latent fingerprints deposited on tinfoil surface treated with CdSe/dendrimer NCs(Nanocomposites)、Cd²⁺-CdSe/ PAMAM NCs and Zn²⁺-CdSe /PAMAM NCs emitted bright yellow photoluminescence under ultraviolet excitation of 365nm from an UV LED in the dark., among, fingerprint treated with Cd²⁺-CdSe/dendrimer NCs and Zn²⁺-CdSe /PAMAM NCs was detected with better resolving rate.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 900-906
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.900
• Online since: July 2011
• Authors: Yu Juan Jin, Yun Jun Luo, Guo Zhi Xu, Biao Yang
• Keywords: Cadmium Selenium, Dendrimer, Fingerprint, Forensic Science, Metallic Ions, Photoluminescence (PL), Semiconductor Quantum Dots

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