应用化学 ›› 2021, Vol. 38 ›› Issue (2): 202-211.DOI: 10.19894/j.issn.1000-0518.200223

• 研究论文 • 上一篇    下一篇

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

郝丽娟, 王婷, 董国华*, 张文治*, 白丽明, 杜海瑶, 郎坤, 李欣   

  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
  • 收稿日期:2020-07-27 接受日期:2020-11-12 出版日期:2021-02-01 发布日期:2021-04-10
  • 通讯作者: *E-mail:ghdong@qqhru.edu.cn; zhangwenzhi@qqhru.edu.cn
  • 基金资助:
    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)和齐齐哈尔大学研究生创新科研项目(No.YJSCX2020028和YJSCX2019034)资助.

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

HAO Li-Juan, WANG Ting, DONG Guo-Hua*, ZHANG Wen-Zhi*, BAI Li-Ming, DU Hai-Yao, LANG Kun, LI Xin   

  1. College of Chemistry and Chemical Engineering & Heilongjiang Provincial Key Laboratory of Catalytic Synthesis for Fine Chemicals, Qiqihar University, Qiqihar 161006, China
  • Received:2020-07-27 Accepted:2020-11-12 Published:2021-02-01 Online:2021-04-10
  • Supported by:
    National Natural Science Foundation of China (No.21776144), the Research Foundation of Education Bureau of Heilongjiang Province of China (No.135509505), the Special Project of Advantage Characteristic Discipline of Heilongjiang Province (No.YSTSXK201841), the College Students' Innovative Entrepreneurial Training Plan Program of Qiqihar University (No.202010232046) and the Innovation Project of Graduate Education of Qiqihar University (Nos.YJSCX2020028, YJSCX2019034)

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。

关键词: 碳量子点, 氢离子, 氢氧根离子, 荧光淬灭, 可逆关-开型

Abstract: 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-.

Key words: Carbon quantum dots, Hydrogen ion, Hydroxyl ion, Fluorescence quenching, Reversible off-on switch

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