发射绿色荧光的钆氮掺杂碳点/水滑石纳米复合材料对潜在指纹的识别  

Green-Light Emitted Nanocomposites of Gd,N-Doped CarbonDots/Hydrotalcite for Recognition of Latent Fingerprints

作　　者：张幸福 张晓彤 李大武[2] 尤楠 丁保宏 ZHANG Xing-fu;ZHANG Xiao-tong;LI Da-wu;YOU Nan;DING Bao-hong(College of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China;College of Forensic Science,Criminal Investigation Police University of China,Shenyang 110035,China)

机构地区：[1]辽宁石油与化工大学石油化工学院,辽宁抚顺113002 [2]中国刑事警察学院刑事科学技术学院,辽宁沈阳110035

出　　处：《光谱学与光谱分析》2024年第5期1301-1306,共6页Spectroscopy and Spectral Analysis

基　　金：公安部科技强警基础工作专项(2021JC07);痕迹检验鉴定技术公安部重点实验室(中国刑事警察学院)项目(HJ2023401KF);上海市刑事科学技术研究院现场物证重点实验室开放课题项目(2016XCW2K03)资助。

摘　　要：碳点(CDs)是一种绿色纳米荧光剂,CDs分散在水溶液中,能够呈现出良好的荧光性能。由于聚集诱导而引发荧光猝灭效应,导致固态的CDs粉末的荧光消失,这一缺陷限制了CDs的实用性。一方面通过在CDs中掺杂其他元素的方式来改变CDs的荧光发射波长和荧光颜色,提高潜在指纹(LFPs)与基材背景间的对比度;另一方面将CDs分散在低值的水滑石表面,阻止CDs的聚集,从而避免了荧光猝灭现象的产生。以酒石酸为碳源、三乙烯四胺为氮源和GdCl_(3),采用水热法先制备钆氮掺杂CDs(Gd/N-CDs),然后再将Gd/N-CDs沉积在水滑石(Gd/N-CDs@H)表面上,制备出了发射绿色荧光的纳米复合材料,并用于LFPs的成像和识别。从表征结果可知,纳米级Gd/N-CDs在水滑石表面的良好分散克服了Gd/N-CDs在固态状态下的荧光猝灭,得到了固态光致发光荧光纳米复合材料。在450 nm光的激发下,Gd/N-CD@H能发射稳定、强烈的绿色荧光,并且在各种基底(如玻璃片、铜箔、瓷砖、塑料、铝箔和纸张)呈现出清晰的LFPs图像。基于Gd/N-CDs@H,新鲜和老化LFPs图案的高级别细节都可以清晰地识别出来,并且具有良好的清晰度和高对比度,无明显的背景干扰。Carbon dots(CDs)areone of the green nano-fluorescent agents.Suspension of CDs can show good fluorescence performance.However,aggregation-induced quenching effects in solid-state CDs can lead to the disappearance of the fluorescence properties of CDs powder,which limits their practicability.In this work,CDs are obtained by doping other elements in CDs to change fluorescent wavelength and color to improve the contrast between the LFPs and the substrate backgrounds.Another improvement is the good dispersion of CDs on the surface of low-cost hydrotalcite for avoiding the occurrence of fluorescence quenching.Herein,Gd/N-doped CDs(Gd/N-CDs)are obtained using tartaric acid as carbon source,triethylenetetramine as nitrogen source,and GdCl_(3)by hydrothermal method,and then green emissive nanocomposite has been synthesized by depositing the Gd/N-doped carbon dots into hydrotalcite(Gd/N-CDs@H)via hydrothermal process for the recognition of LFPs.The good dispersion of the nano-sized Gd/N-CDs on the surface of hydrotalcite overcomes the fluorescence quenching of the Gd/N-CDs in the solid-state and can enhance the solid-state fluorescence.The Gd/N-CDs@H emits stable,strong green fluorescence and exhibits vivid images of LFPs on various substrates such as glass slides,copper foil,tiles,plastic,aluminum foil and paper.The high-level details of ridge patterns of fresh and aged LFPs can be clearly identified with good clarity and high contrast without background interferences under an excitation of 450 nm light source.

关 键 词：荧光 潜在指纹 水滑石 碳点 纳米复合材料 

分 类 号：O647.3[理学—物理化学]