分析化学2024，Vol.52Issue(4)：492-503,12.DOI:10.19756/j.issn.0253-3820.231387
碳点的合成与表征及其在潜在手印显现中的应用
Synthesis and Characterization of Carbon Dots and Its Applications in Latent Fingerprint Development
摘要
Abstract
Fluorescent carbon dots(CDs)were synthesized via a solvothermal method with citric acid and urea as raw materials,and ethylene glycol as reaction solvent.The micromorphology,crystal structure,elemental composition,surface functional group,and optical property of as-synthesized CDs were characterized.The excitation-dependent fluorescence property of CDs was investigated,and the effects of synthesis conditions including reaction temperature,reaction time and raw materials on excitation and emission wavelengths of the CDs were also discussed.Then,a series of CDs-based fluorescent composites were prepared by combining CDs with starch,nano-silica,montmorillonite,kaoline,kieselguhr and magnesium oxide,respectively.Finally,the CDs-starch composites were used for latent fingerprint development on smooth substrates,and the qualitative as well as quantitative evaluation of the contrast,sensitivity and selectivity in fingerprint development were also made.Enhanced development of latent fingerprints was thus achieved by the aid of the excitation-dependent fluorescence property of CDs-starch composite combined with the optical filtering technique,which could decrease the background noise interference to a great extent.Experimental results showed that,the contrast between fingerprint(developing signal)and substrate(background noise)was obvious,exhibiting a strong contrast;the minutiae of papillary ridges were clear,indicating a high sensitivity;the adsorption between CDs-starch composites and fingerprint residues was specific,showing a good selectivity.关键词
碳点/荧光/纳米材料/潜在手印/手印显现Key words
Carbon dots/Fluorescence/Nanomaterials/Latent fingerprint/Fingerprint development引用本文复制引用
范文卓,于卓弘,王猛,李杰,杜怡泽,李明,袁传军..碳点的合成与表征及其在潜在手印显现中的应用[J].分析化学,2024,52(4):492-503,12.基金项目
国家自然科学基金项目(Nos.21205139,21802169)、辽宁省应用基础研究计划项目(No.2023JH2/101300097)、辽宁省2020年百千万人才工程项目、辽宁省教育厅科学研究经费项目(Nos.LJKZ0068,LJKZ0076,LJKMZ20220384)和中国刑事警察学院2023年研究生创新能力提升项目(Nos.2023YCYB45,2023YCYB46)资助. Supported by the National Natural Science Foundation of China(Nos.21205139,21802169),the Project of Applied Basic Research Program from Liaoning Province(No.2023JF12/101300097),the Liaoning BaiQianWan Talents Program in 2020,the Scientific Research Fund Project from Educational Department of Liaoning Province(Nos.LJKZ0068,LJKZ0076,LJKMZ20220384),and the Innovation Ability Enhancement Project of Postgraduates from Criminal Investigation Police University of China(Nos.2023YCYB45,2023YCYB46). （Nos.21205139,21802169）
