归属学者：

彭迪

归属院系：

刑事侦查学院

作者：

Peng, Di^1,2 ; Zhao, Zihe

摘要：

Expanding the application of silicon based luminescent materials is a fast-growing interdisciplinary field. Herein, a novel fluorescent bifunctional probe based on silicon quantum dots (SiQDs) for highly sensitive Fe3+ sensing and high-resolution latent fingerprint (LFP) imaging was subtly devised. The SiQD solution was mildly prepared using 3-aminopropyl trimethoxysilane as the silicon source and sodium ascorbate as the reductant, showing green emission at 515 nm under UV irradiation with a quantum yield of 19.8%. As a highly sensitive fluorescent sensor, the SiQD was demonstrated to have a highly selective quenching with Fe3+ in the concentration range of 2-1000 & mu;M with the LOD of 0.086 & mu;M in water. The quenching rate constant and association constant of the SiQDs-Fe3+ complex was calculated to be 1.05 x 1012 mol/s and 6.8 x 103 L/mol, respectively, suggesting a static quenching effect between them. Moreover, to achieve high-resolution LFP imaging, a novel SiO2@SiQDs composite powder was further fabricated. The SiQDs were covalently anchored on the surface of silica nano-spheres to conquer aggregation-caused quenching for the high-solid fluorescence. In the demonstration of LFP imaging, this silicon based luminescent composite exhibited high developing sensitivity, high selectivity and high contrast, indicating its practical value as a fingerprint developer at crime scenes.

语种：

英文

出版日期：

2023-10-15

学科：

化学; 光学工程

收录：

PUBMED; SCI(E)

提交日期：

2023-08-02

引用参考：

Peng, Di; Zhao, Zihe. Highly efficient ferric ion sensing and high resolution latent fingerprint imaging based on fluorescent silicon quantum dots[J]. SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY,2023():.