Rapid Synthesis of C-dots@PGV Nanocomposites Powders for Development of Latent Fingermarks

Abstract

Abstract Novel fluorescent nanocomposites prepared by microwave irradiation and electrostatic adsorption have been formulated for developing latent fingermarks on various object surfaces. As-synthesized carbon dots@montmorillonite (C-dots@PGV) nanocomposites were characterized using UV–visible absorption spectroscopy, fluorescence spectroscopy, infrared spectroscopy, TEM/HRTEM, SEM and XRD. Due to its photoluminescence and stable chemical properties, C-dots@PGV nanocomposites powders with intense fluorescence produce sharp and clear development of latent fingermarks with good contrast and satisfactory ridge details. It is widely used for painted metal, glass, plastic and stainless steel surfaces, and the small, fine fluorescent nanocomposites demonstrate great advantages. Especially for multicolor surfaces, the fluorescent probe can help us to observe and photograph using UV light as excitation light source to eliminate background effects. After developing by facile powder technique, the prints emit strong violet-blue fluorescence under UV light (365 nm), at the same time, this nontoxic powder without any organic solvent and dyes can reduce harm to the operators.