摘要
以海藻酸为碳源,乙二胺为氮掺杂剂,采用简单方便的微波法制备得到氮掺杂碳点(N-CDs)/海藻酸纳米复合物.通过透射电镜观察到所制得的N-CDs/海藻酸纳米复合物有纳米粒子存在,它们的平均粒径为4.6 nm.荧光性能分析表明N-CDs/海藻酸纳米复合物在365 nm紫外光下呈现明显的蓝色荧光,并且其荧光发射性能具有激发光波长依赖性.N-CDs/海藻酸纳米复合物还保留了海藻酸与Ca^(2+)作用形成凝胶的性能以及与一些二价金属离子的配位能力,可以直接应用于阳极电沉积和配位电沉积.利用电沉积技术具有空间选择性和时间可控性的特点,可以在电极上构建不同形状和荧光图案的N-CDs/海藻酸电沉积膜,还可以对电沉积膜的厚度进行调控.此外,利用电沉积技术制备的N-CDs/海藻酸电沉积膜电极可用于进行电化学检测.
Herein,a nitrogen-doped carbon dots(N-CDs)/alginate nanocomposite was prepared by a simple and convenient microwave method.In this method,alginate served as the carbon source and ethylenediamine served as the nitrogen dopant.Transmission electron microscopy(TEM)observation shows that there exist nanoparticles in the N-CDs/alginate nanocomposite with the average size of 4.6 nm.The fluorescence properties of the N-CDs/alginate nanocomposite were analyzed using fluorescence spectroscopy and ultraviolet-visible(UV-Vis)absorption spectroscopy.The UV-Vis spectrum of the N-CDs/alginate nanocomposite shows a broad absorption peak from 300 nm to 350 nm,which is attributed to N-CDs in the nanocomposite.The photoluminescence spectrum of the N-CDs/alginate nanocomposite shows a typical excitation-dependent photoluminescence feature.Moreover,the N-CDs/alginate nanocomposite presents a clear blue fluorescence under 365 nm UV light.The nanocomposite retains the property of alginate to bind Ca^(2+) to induce the gelation of alginate,which can be used to perform the anodic electrodeposition of the N-CDs/alginate nanocomposite.On the other hand,it also retains the coordinated capability of alginate to interact with metal ions(such as Zn^(2+))to form a gel,which can be employed to carry out the coordination electrodeposition of the N-CDs/alginate nanocomposite.By taking advantage of the spatial selectivity of electrodeposition technique,the deposited N-CDs/alginate nanocomposite films with specific shapes and fluorescence patterns can be conveniently fabricated on electrodes.The thickness of the electrodeposited N-CDs/alginate film increases with the increase of electrodeposition time,which provides a controllable means to produce the electrodeposited N-CDs/alginate film with different thicknesses.Furthermore,the electrodeposition of the N-CDs/alginate nanocomposite enables a facile way to generate CDs nanocomposite film modified electrodes to conduct electrochemical detection.Thus,the N-CDs/alginate nanocomposite prepared by the microwave method has potential applications in fluorescence imaging and electrochemical detection.
作者
刘慧
杨逸霏
曹凯元
殷洁
熊燕飞
石川东
王艺峰
Hui Liu;Yi-fei Yang;Kai-yuan Cao;Jie Yin;Yan-fei Xiong;Chuan-dong Shi;Yi-feng Wang(School of Materials Science and Engineering,2School of Science,Wuhan University of Technology,Wuhan 430070)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2021年第7期741-749,I0003,共10页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51873167)
国家级大学生创新创业训练计划(项目号202010497011)
武汉理工大学自主创新研究基金(基金号205201009)资助项目.
关键词
电沉积技术
碳点
海藻酸
微波法
天然高分子
Electrodeposition technique
Carbon dots
Alginate
Microwave method
Biopolymer
作者简介
通讯联系人:王艺峰,E-mail:yifengwang@whut.edu.cn。
