Controlled Assembly of Gold and Rare-Earth Upconversion Nanoparticles for Ratiometric Sensing Applications

作     者：LUO Min LI Qian CHEN Ming HE Yadan YE Huimin YU Xuefeng 

作者机构：School of Physics and Technology/Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education Wuhan University Key Laboratory of Analytical Chemistry for Biology and Medicine of Ministry of Education Wuhan University 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：2013年第18卷第4期

页      面：277-282页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Supported by grants from the Natural Science Foundation of Jiangsu Province(SBK201240182) the Natural Science Foundation of China(J1210061) 

主　　题：gold nanoparticles rare-earth nanoparticles assembly upconversion fluorescence pH sensingrsion NPs have aroused special intere unique advantages of upconversion 

摘      要：In this paper, the Au nanoparticles and rare-earth （RE） upconversion nanoparticles （NPs） were respectively synthesized by using polyelectrolyte as the capping agents. Since the synthesized Au NPs and RE NPs had the similar size and surface conditions, Their mixture were employed in a pH sensing application. Benefited from the good spectral overlap between the RE upconversion emission bands and pH-tunable surface plasmon bands of the Au NPs, the pH-induced manipulation of green-to-red emission intensity ratio of the upconversion fluorescence was achieved in the Au-RE mixture. The results demonstrate a rapid ratiometric approach for pH sensing, which is more efficient than traditional sensing methods that depend on single intensity-based responses to analytes.