基于玉米淀粉制备绿色碳量子点及氢离子/氢氧根离子调节荧光开关性能  

Preparation of Green Carbon Quantum Dots from Corn Starch and Hydrogen Ion/Hydroxyl Ion Regulated Fluorescent Switch Performance

作　　者：郝丽娟 王婷 董国华[1] 张文治[1] 白丽明[1] 杜海瑶 郎坤 李欣 HAO Li-Juan;WANG Ting;DONG Guo-Hua;ZHANG Wen-Zhi;BAI Li-Ming;DU Hai-Yao;LANG Kun;LI Xin(College of Chemistry and Chemical Engineering&Heilongjiang Provincial Key Laboratory of Catalytic Synthesis for Fine Chemicals,Qiqihar University,Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学化学与化学工程学院,精细化工催化合成黑龙江省重点实验室,齐齐哈尔161006

出　　处：《应用化学》2021年第2期202-211,共10页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(No.21776144);黑龙江省教育厅项目(No.135509505);黑龙江省优势特色学科植物性食品加工技术特色学科专项(No.YSTSXK201841);齐齐哈尔大学大学生创新创业训练计划项目(No.202010232046);齐齐哈尔大学研究生创新科研项目(No.YJSCX2020028和YJSCX2019034)资助.

摘　　要：以玉米淀粉为碳源,在草酸的作用下利用乙醇溶剂热法制备了一种绿色荧光碳量子点(G-CQDs)。通过透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、X射线光电子能谱(XPS)和Raman光谱等测试分析了G-CQDs的形貌、组成和结构。结果表明,G-CQDs为粒径为2~5 nm的准球形纳米颗粒,表面含有丰富的C—O、O—H等亲水性基团;且具有类石墨烯结构。荧光测试结果表明,合成的G-CQDs在385 nm的光激发下在~520 nm处呈现明显的荧光发射,且发射强度随着G-CQDs浓度的降低呈现先增大后降低的趋势,其荧光量子产率可达38.5%。此外,G-CQDs的荧光发射强度随着溶液H+和OH-的浓度变化表现出明显不同的淬灭行为,并可用于溶液中H+和OH-的可逆关-开“off-on”型荧光响应探针。Green fluorescent carbon quantum dots(G-CQDs)were synthesized from corn starch and oxalic acid via an ethanol solvothermal method.The morphology,composition and structure of G-CQDs were analyzed using transmission electron microscopy(TEM),Fourier transform infrared spectrometer(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Raman spectroscopy.The results show that G-CQDs are quasi-spherical nanoparticles with the particle size of about 2~5 nm and have graphene-like structure with abundant water-soluble groups such as C—O and O—H on the surface.The fluorescence measurement assay results exhibit that the synthesized G-CQDs display strong fluorescence emission at~520 nm with the excitation wavelength of 385 nm,and the emission intensity increases first and then decreases with the decrease of the concentration of G-CQDs.The fluorescence quantum yield of the synthesized G-CQDs can reach up to 38.5%.Moreover,the fluorescence emission of G-CQDs exhibits various decay behaviors with the varied concentration of H^+ and OH^-.Therefore,the synthesized G-CQDs can be utilized as the reversible“off-on”switch probe for the detection of H^+ and OH^-.

关 键 词：碳量子点 氢离子 氢氧根离子 荧光淬灭 可逆关-开型 

分 类 号：O613.7[理学—无机化学]