固态发光碳纳米粒子的制备及在潜指纹成像中的应用

doi:10.7503/cjcu20190343

摘要/Abstract

摘要：

采用热分解法, 以柠檬酸钠和尿素为前驱体, 通过控制反应温度制备了不需要结合任何固体分散基质即可呈现明亮固态发光的碳纳米粒子(CNPs). 利用X射线衍射(XRD), 透射电子显微镜(TEM), X射线光电子能谱(XPS)、紫外-可见吸收光谱(UV-Vis)和光致发光光谱(PL)等对CNPs的物相、形貌和粒径、表面基团及光学特性进行了表征. 结果表明, 该CNPs为无定形碳结构, 准球形形貌, 粒径分布在5~15 nm范围, 其表面存在C=O, C=N和O=C—N等基团. CNPs的水溶液和固体粉末在365 nm紫外光辐射下, 均呈现明亮的蓝绿色发光. 将该CNPs粉末用作荧光试剂可直接显现不同非渗透性客体表面的潜指纹(LFPs). 在365 nm紫外光激发下, CNPs粉末刷显后的LFPs细节特征清晰可辨, 强荧光背景客体表面的LFPs获得了高对比度的显现效果. 同时, 老化30 d的LFPs利用CNPs粉末也能够显现出可识别的指纹细节. CNPs发光粉末作为指纹试剂在刑侦领域具有潜在的应用前景.

关键词: 碳纳米粒子, 固态发光, 潜指纹成像

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

中图分类号:

O644.1

TrendMD:

王桂萍,张平,王桂燕. 固态发光碳纳米粒子的制备及在潜指纹成像中的应用. 高等学校化学学报, 2019, 40(12): 2583.

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

图/表 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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