Chemical Journal of Chinese Universities ›› 2019, Vol. 40 ›› Issue (12): 2583-2589.doi: 10.7503/cjcu20190343

• Physical Chemistry • Previous Articles     Next Articles

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

Guiping WANG1,Ping ZHANG2,Guiyan WANG2,*()   

  1. 1. School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159, China
    2. School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China
  • Received:2019-06-17 Online:2019-12-04 Published:2019-12-04
  • Contact: Guiyan WANG E-mail:wangguiyan2004@126.com
  • Supported by:
    ? Supported by the Supreme Research Project Foundation of Shenyang Pharmaceutical University, China(ZYJJ2017001)

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: