可再生的开关型荧光自组装膜的构建及其对磷酸根的痕量检测  

Fabrication of regenerable fluorescent self-assembled film and detection of trace phosphate ion

作　　者：张静[1] 孙向英[1] 杨传孝[1] 刘斌[1] 

机构地区：[1]华侨大学材料科学与工程学院,厦门361021

出　　处：《环境化学》2013年第12期2385-2389,共5页Environmental Chemistry

基　　金：国家自然科学基金(21275059;21175049);福建省自然科学基金(2012J01044;2011J01049);国务院侨务科研基金(11QZR12);中央高校基本科研业务费专项资金(JB-2R1118和JB-ZR1215)资助

摘　　要：以巯基乙酸为稳定剂,在碱性条件下合成了水溶性的碲化镉量子点(CdTe QDs),并构建CdTe自组装膜(SAMs).基于Eu3+与PO3-4的结合能力强于其与CdTe QDs表面的羧基,建立了可再生的CdTe QDs SAMs测定痕量PO3-4的荧光OFF-ON新方法,灵敏度较纯液相分析提高3个数量级.该方法的线性范围为9.90—90.9 nmol·L-1,检测限为4.97×10-12mol·L-1.该自组装膜传感器可应用于环境水样中磷酸根的痕量检测,并且可再生重复使用.With thioglycolic acid （TGA） as stabilizing agents, water-soluble CdTe QDs were synthesized in alkaline conditions and constructed into self-assembled CdTe muhilayers（SAMs）. A new PO43- sensor with regenerable ＂off-on＂ switchable fluorescence property was developed, which was based on the differential binding strength with Eu^3＋ between PO3- and carboxyls. The sensitivity of the SAM sensor was higher than the CdTe liquid by 3 orders of magnitude. In addition, the linear range of this 90.9 nmol.L^-1 , and the detection limit was 4.97× 10^-12. The method was between 9.90 nmol. L^-1 and self-assembled film sensors can be applied to the detection of the phosphate in water samples, and can be regenerated

关 键 词：自组装膜 量子点 磷酸根 界面荧光 开关型传感器 

分 类 号：X832[环境科学与工程—环境工程]