硅量子点的控制合成、表征及对Cu^(2+)的高灵敏传感  

Synthesis,Characterization of Silicon Quantum Dots and High Sensitivity Sensing for Cu^(2+)

作　　者：刘振平[1] 庞钶靖 姜容[1] 甘芳瑗 夏明星 聂青玉[3] LIU Zhen-ping;PANG Ke-jing;JIANG Rong;GAN Fang-yuan;XIA Ming-xing;NIE Qing-yu(Chongqing Vocational Institute of Safety & Technology, Chongqing 404020, China;Chongqing Customs Technical Center, Chongqing 400020, China;Chongqing Three Gorges Vocational College, Chongqing 404155, China)

机构地区：[1]重庆安全技术职业学院,重庆404020 [2]重庆海关技术中心,重庆400020 [3]重庆三峡职业学院,重庆404155

出　　处：《发光学报》2021年第1期73-82,共10页Chinese Journal of Luminescence

基　　金：重庆市教育委员会科学技术研究计划青年项目(KJQN201804703);重庆市教育委员会高校创新研究群体项目(CXQTP19037)资助。

摘　　要：通过一步无溶剂法合成了具有较好发光稳定性和水溶性的硅量子点(Silicon quantum dots,Si-QDs),并利用透射电镜(TEM)、红外吸收光谱(IR)、X射线光电子能谱(XPS)、X射线衍射(XRD)和荧光光谱等手段对其进行了表征。试验发现,Si-QDs在378 nm的激发光照射下,可产生峰值位于468 nm的宽带发光;在水溶液中,添加适量Cu^(2+)可对Si-QDs的发光产生静态猝灭。利用荧光信号猝灭程度与Cu^(2+)浓度之间稳定的相关性可实现对Cu^(2+)的定量检测。优化条件下,Si-QDs荧光强度变化与Cu^(2+)浓度在16.7~1670 nmol·L^(-1)范围内呈稳定的线性相关性,(F_(0)-F)/F_(0)=0.18808lnC(Cu^(2+))-0.41377(R^(2)=0.998),检出限低至4.7 nmol·L^(-1)(S/N=3)。对多种实际水样品做了加标回收率试验,回收率介于89.47%~106.75%之间。本研究制备的Si-QDs用于水中Cu^(2+)快速、高灵敏检测具有良好重复性和稳定性。In this study,silicon quantum dots(Si-QDs)with good luminous stability and water solubility were synthesized by one-pot solvent-free method and characterized by the transmission electron microscopy(TEM),infrared spectroscopy(IR),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD)and fluorescence spectroscopy.It was found in the experiment that the Si-QDs emit broadband luminescence at 478 nm under the excitation at 378 nm.The luminescence of Si-QDs can be quenched statically by adding Cu^(2+)in aqueous solution.The stable correlation between the degree of quenching of fluorescence signal and the concentrations of Cu^(2+)was used to realize the quantitative detection of Cu^(2+).Under the optimized conditions,there was a stable correlation between the fluorescence intensity change of Si-QDs and the concentrations of Cu^(2+)in the range of 16.7-1670 nmol·L^(-1),(F_(0)-F)/F_(0)=0.18808lnC(Cu^(2+))-0.41377(R^(2)=0.998),and the detection limit was down to 4.7 nmol·L^(-1)(S/N=3).Several actual water samples were detected,the recovery rates ranged from 89.47%to 106.75%.The Si-QD prepared in this study had good repeatability and stability for the rapid and highly sensitive detection of Cu^(2+)in water.

关 键 词：硅量子点 荧光传感材料 铜离子 水 

分 类 号：O482.31[理学—固体物理]