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林产化学与工业 ›› 2021, Vol. 41 ›› Issue (2): 79-85.doi: 10.3969/j.issn.0253-2417.2021.02.011

• 研究报告 • 上一篇    下一篇

生物质基绿色荧光N掺杂碳点的制备及分析

刘一繁1, 姜宇1, 韩有奇1, 李淑君1, 姜贵全2, 韩世岩1,*()   

  1. 1. 东北林业大学 生物质材料科学与技术教育部重点实验室, 黑龙江 哈尔滨 150040
    2. 吉林省木质材料科学与工程重点实验室, 北华大学, 吉林 吉林 132013
  • 收稿日期:2020-07-10 出版日期:2021-04-28 发布日期:2021-05-08
  • 通讯作者: 韩世岩 E-mail:hanshiyan80@163.com
  • 作者简介:韩世岩, 高级工程师, 硕士生导师, 研究领域为生物质基功能材料的制备研究; E-mail: hanshiyan80@163.com
    刘一繁(1999-), 女, 河北石家庄人, 本科生, 研究方向为生物质发光材料的制备研究
  • 基金资助:
    国家自然科学基金资助项目(31870553);吉林省农业领域重点研发规划项目(20190301045NY);大学生创新项目(CL201904)

Preparation and Analysis of Biomass-based N-doped Carbon Dots with Green Fluorescence

Yifan LIU1, Yu JIANG1, Youqi HAN1, Shujun LI1, Guiquan JIANG2, Shiyan HAN1,*()   

  1. 1. Key Laboratory of Bio-based Material Science & Technology(Ministry of Education), Northeast Forestry University, Harbin 150040, China
    2. Key Laboratory of Wooden Materials Science and Engineering of Jilin Province, Beihua University, Jilin 132013, China
  • Received:2020-07-10 Online:2021-04-28 Published:2021-05-08
  • Contact: Shiyan HAN E-mail:hanshiyan80@163.com

摘要:

以落叶松树皮为原料,40%乙醇水溶液为溶剂,通过超声波破碎法得到提取液后加入乙二胺,采用水热合成法制备了N掺杂碳点(NCDs)。通过FT-IR、XPS、TEM、XRD和UV对NCDs的结构进行表征分析,结果表明:制备的NCDs主要含有C、N、O这3种元素,其表面存在苯环、氨基、羟基和羰基等基团;NCDs为球形粒子,平均粒径4.8 nm,其存在石墨化碳核的(002)晶面,在≤300 nm和300~600 nm区域存在由π-π*和n-π*电子跃迁引起的紫外吸收,证实了NCDs主要由石墨化碳核及其表面功能基团组成。荧光性能分析结果表明:NCDs具有激发依赖性和良好的抗光漂白稳定性,随着温度的升高其荧光强度降低。通过不同金属离子对NCDs荧光强度影响分析,可知Fe3+对NCDs具有选择性荧光静态猝灭作用,其检测极限(LOD)值为9.07 μmol/L。通过复合法制备了黄绿色荧光粉NCDs/SiO2,将其作为颜色转换层,使用蓝光发射(450 nm)半导体芯片封装,可得到国际照明委员会(CIE)1931色度图坐标为(0.318 2,0.303 0),相关色温(CCT)为6 381 K,显色指数(CRI)为84.1的白色发光二极管(WLED)。

关键词: 落叶松树皮, N掺杂碳点, 荧光, Fe3+检测, WLED

Abstract:

The extract solution was obtained by ultrasonic crushing with using larch bark as raw material and 40% ethanol aqueous solution as solvent, and ethylenediamine was then added to prepare N-doped carbon dots(NCDs) by hydrothermal synthesis method. FT-IR, XPS, TEM, XRD and UV were applied to characterize and analyze the structure of NCDs. The results showed that the prepared NCDs mainly contained three elements of C, N and O, and the surface bear benzene ring, amino, hydroxyl and carbonyl groups. The NCDs were spherical particles with an average particle size of 4.8 nm, and had (002) lattice plane of graphitized carbon core. The existences of ultraviolet absorption caused by π-π* and n-π* electron transitions was in the region of ≤300 nm and 300-600 nm. These results confirmed that NCDs were mainly composed of graphitized carbon core and surface functional groups. In addition, fluorescence analysis showed that NCDs had excitation dependence and stability against photobleaching, and the fluorescence intensity decreased with increasing temperature. The analysis of the effect of different metal ions on the fluorescence intensity of NCDs showed that Fe3+ had selective fluorescence static quenching effect on NCDs with the limit of detection(LOD) of 9.07 μmol/L. Additionally, the yellow-green phosphor NCDs/SiO2 was also prepared by the composite method and was used as the color conversion layer. The white light-emitting diodes(WLEDs) with CIE color coordinates of (0.318 2, 0.303 0), correlation color temperature of 6 381 K and color rendering index of 84.1, were obtained by using blue emission(450 nm) semiconductor chip encapsulation.

Key words: larch bark, N doped carbon dots, fluorescence, Fe3+ detection, WLED

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