Citation: Bo-Wen MA, Jia-Wei LI, Meng WANG, Yu-Heng LI, Ming LI, Chuan-Jun YUAN. Synthesis of terbium fluorescent nanocomplexes and their applications in the development of latent bloody fingerprints[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(9): 1673-1681. doi: 10.11862/CJIC.2023.141 shu

Synthesis of terbium fluorescent nanocomplexes and their applications in the development of latent bloody fingerprints

College of Forensic Sciences, Criminal Investigation Police University of China, Shenyang 110035, China

Corresponding author: Meng WANG, mengwang@alum.imr.ac.cn
Received Date: 23 March 2023
Revised Date: 1 June 2023

Figures(10)

Carboxyl functionalized terbium fluorescent nanocomplex was chemically synthesized by a one-step process using terbium ion as the luminescence center, p-phthalic acid as the first ligand, and phenanthroline as the second ligand. The carboxyl groups on the surface of these nanocomplexes were further activated using 1-(3-dimethyl-amino-propyl)-3-ethylcarbodiimine hydrochloride as the activator combined with N-hydroxy succinimide as the stabilizer. Due to the rapid and mild amide reaction between the activated carboxyl groups on the surface of the nano-complexes and the amino groups in bloody fingerprint residuals, the resulting nanocomplexes were finally used as fluorescent probes for the targeted development of latent bloody fingerprints. Excited with 254 nm ultraviolet light, the papillary ridges could emit strong green fluorescence, which could give a sufficient contrast between the developing signal and the background noise; the papillary ridges were coherent, the minutiae were sharp, and the sweat pores were distinct; the contrast between the ridges and the furrows were obvious. The parameters for fingerprint development were optimized, namely, the mass ratio of nanocomplex to water in suspension was recommended to be 1:35, and the period for staining was recommended to be 20 s. In addition, the contrast, sensitivity, selectivity, and applicability in fingerprint development were also investigated in detail. Experimental results show that the activated carboxyl functionalized terbium fluorescent nanocomplexes are suitable for developing the latent bloody fingerprints on smooth non- and semi-porous surfaces with high quality and high efficiency.
- rare earth,
- fluorescence,
- nanoparticles,
- complexes,
- fingerprint,
- development
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