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- Title
Synthesis of Photoluminescent Core–Shell-Structured Carbon dots@silica Nanocomposite Fingermark Powders for Latent Fingermarks Visualization.
- Authors
Chen, Hong Yu; Liu, Li
- Abstract
To obtain solid-state photoluminescent core–shell-structured carbon dots@silica (C-dots@SiO2) nanocomposites, the C-dots were synthesized by microwave irradiation and were dispersed in SiO2 through sol–gel technique. Then, the excellent fluorescent property with excitation-independent feature and the core–shell structure of C-dots@SiO2 nanocomposites were successfully characterized through the fluorescence spectroscopy, ultraviolet–visible absorption spectroscopy (UV-Vis), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The as-prepared C-dots@SiO2 powder was mixed with reduced iron powder and then applied to latent fingermark detection. The latent fingermarks on several surfaces labeled with C-dots@SiO2 fingermark powders emitted blue fluorescence under 365 nm UV light and exhibited high contrast between the background and the ridges. Additionally, the C-dots@SiO2 fingermark powder as a fluorescent label for enhancing latent fingermarks demonstrated greater advantages as compared to the conventional fluorescent fingermark powder especially for latent fingermark deposited on porous surfaces. The solid-state photoluminescent core–shell-structured carbon dots@silica (C-dots@SiO2) nanocomposites were successfully fabricated by microwave assisting and sol–gel technique. The C-dots@SiO2 nanocomposite fingermark powders clearly indicated well-defined papillary ridges even for sweat pores, and thus have been expected to be an ideal fluorescent label for latent fingermark visualization.
- Subjects
HIGH resolution electron microscopy; QUANTUM dots; FOURIER transform infrared spectroscopy; IRON powder; POWDERS; ULTRAVIOLET-visible spectroscopy
- Publication
NANO, 2019, Vol 14, Issue 6, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292019500681