Synthesis of Carbon Nanoparticles with Efficient Solid-state Emission and Its Application for Imaging of Latent Fingerprints †

doi:10.7503/cjcu20190343

Abstract

Abstract:

A facile reaction temperature-controlled pyrolytic method was developed to prepare solid-state fluorescent carbon nanoparticles(CNPs) using sodium citrate and urea as precursors. The obtained CNPs exhibit bright emission in the solid state without any other additional solid matrices. The phase, microstructure, surface functional groups, and optical properties of the CNPs were characterized by means of X-ray powder diffraction(XRD), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), UV-Vis spectroscopy and photoluminescence spectra(PL). The results indicated that the CNPs were amorphous carbon structure, nearly spherical shape with diameter of ca. 5—15 nm, and C=O, C=N and O=C—N groups on the surface. Under 365 nm UV light excitation, CNPs exhibit bright blue-green emission in the solution and solid state. The CNPs powder was directly employed as fluorescent reagent for the visualization of latent fingerprints(LFPs) on different non-infiltrating surfaces. Results indicate that CNPs can be used as fluorescent probe to rapidly visualize the precision substructure of LFPs by the powder dusting method, showing high contrast with low background interference. Importantly, the CNPs powder could successfully achieve the fluorescent imaging for LFPs after aged for 30 d. The results demonstrate that CNPs could be used as a developer for effective latent fingerprint detection in forensic science.

Key words: Carbon nanoparticle, Solid-state luminescence, Latent fingerprint imaging

CLC Number:

O644.1

Guiping WANG,Ping ZHANG,Guiyan WANG. Synthesis of Carbon Nanoparticles with Efficient Solid-state Emission and Its Application for Imaging of Latent Fingerprints ^†[J]. Chemical Journal of Chinese Universities, 2019, 40(12): 2583-2589.

Figures/Tables 9

Fig.1 XRD pattern(A), TEM image(B) and DLS size analysis(C) of CNPs

Fig.2 XPS survey spectrum(A) and XPS high resolution spectra of C1s(B), N1s(C) and O1s(D) of CNPs

Fig.3 UV-Vis absorption spectrum of CNPs

Fig.4 Emission spectra of CNPs in solution(A) and solid state powder(B) at different excitation wavelengths Inset: photographs of CNPs in solution and solid state powde taken under daylight(Ⅰ) and under irradiation with a 365 nm UV light(Ⅱ). λex/nm: a. 340; b. 360; c. 380; d. 400; e. 420; f. 440.

Fig.5 LFPs on different surfaces visualized by CNPs powder under 365 nm UV irradiation (A) Glass slide; (B) stainless steel sheet; (C) mobile charger; (D) black marble; (E) transparent plastic sheet; (F) painted wood; (G) aluminum foil; (H) ceramic tile.

Fig.6 Images of LFPs developed with CNPs powder on glass(A), and magnified images of fingerprints with details(B—D) under 365 nm UV irradiation (B) Including short ridge; (C) bifurcation; (D) termination. Images (B)—(D) are the enlarged positions 1—3 of image(A), respectively.

Fig.7 Images of LFPs developed with CNPs powder on background interference substrates of green(A), blue(B), and yellow(C) membership cards, and admission ticket(D) under 365 nm UV irradiation

Fig.8 Images of 0(A), 7(B), 15(C), and 30 day-old(D) developed fingerprints on glass slides by CNPs powder under 365 nm UV irradiation

Fig.9 Images of LFPs developed with freshly prepared(A) and stored 6 months(B) CNPs powder on glass slides under 365 nm UV irradiation

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