pH响应氮掺杂碳点的制备及其光学性能调控  

Preparation of pH-responsive nitrogen-doped carbon dots and their optical properties regulations

作　　者：董健胜 庄子恒 殷允杰 DONG Jiansheng;ZHUANG Ziheng;YIN Yunjie(Key Laboratory of Eco-Textiles,Ministry of Education,College of Textile Science and Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China)

机构地区：[1]江南大学纺织科学与工程学院生态纺织教育部重点实验室,江苏无锡214122

出　　处：《精细化工》2025年第4期804-810,共7页Fine Chemicals

摘　　要：以色氨酸和邻苯二胺为前驱体、无水乙醇和去离子水为溶剂,采用溶剂热法制备了氮掺杂碳点(N-CDs),考察了n(色氨酸)∶n(邻苯二胺)和反应时间对制备N-CDs量子产率的影响。通过FTIR、XRD、TEM、XPS和TGA对N-CDs进行了表征和测试。利用荧光光谱、量子产率测定和荧光寿命测试探究了N-CDs的光学性能。结果表明,当n(色氨酸)∶n(邻苯二胺)=1.5∶1.0、反应时间6 h时,制备的N-CDs具有最高的量子产率(13.95%);N-CDs呈球形结构,平均粒径为(3.65±0.26)nm,表面富含氨基、羟基、羧基及羰基等极性官能团。N-CDs的最大激发波长和最大发射波长分别为535和601 nm,在535 nm处的绝对量子产率高达21.39%。N-CDs乙醇溶液在酸性条件下展现蓝色荧光,在碱性条件下则呈现粉色但无荧光,表现出对pH敏感的颜色和荧光响应性。Nitrogen-doped carbon dots(N-CDs)were synthesized via solvothermal method using tryptophan and o-phenylenediamine as precursors,absolute ethanol and water as solvents,and characterized by FTIR,XRD,TEM,XPS and TGA.The effects of n(tryptophan)∶n(o-phenylenediamine)and reaction time on quantum yield of N-CDs were evaluated,while the optical characteristics of N-CDs were analyzed through fluorescence spectroscopy,quantum yield test,and fluorescence lifetime assessment.The results demonstrated that the N-CDs synthesized under the conditions of n(tryptophan)∶n(o-phenylenediamine)ratio=1.5∶1.0 and reaction time 6 h exhibited the optimal quantum yield(13.95%).The N-CDs possessed a spherical structure with an average diameter of(3.65±0.26)nm and a surface enriched in polar functional groups,including amino,hydroxyl,carboxyl,and carbonyl groups.The maximum excitation and emission wavelengths of N-CDs were 535 and 601 nm,respectively,with an absolute quantum yield of 21.39%at 535 nm.The ethanol solution of N-CDs displayed blue fluorescence under acidic conditions and a pink hue without fluorescence under alkaline conditions,indicating pH-sensitive color and fluorescence changes.

关 键 词：碳点 氮掺杂 色氨酸 PH响应 荧光 功能材料 

分 类 号：O657.3[理学—分析化学] TQ127.11[理学—化学]