中文摘要：

采用溶剂热法制备了聚乙二醇修饰的NaLuF4：Yb,Ho上转换纳米粒子（NaLuF4：Yb,Ho NPs）,并对其进行了表征。以NaLuF4：Yb,Ho NPs为能量供体,罗丹明B为能量受体,建立了发光共振能量转移体系。向以上体系中加入羟基自由基（·OH）,罗丹明B被·OH氧化裂解,共振能量转移体系被破坏,NaLuF4：Yb,Ho NPs的发光得到恢复,据此,建立了NaLuF4：Yb,Ho纳米探针测定·OH的新方法。方法的线性范围为1.00×10^-6-2.00×10^-4mol/L,检出限为2.4×10^-7mol/L。同时,基于该体系对几种物质的抗氧化能力进行了评估。

英文摘要：

Polyethylene glycol modified NaLuF4 ： Yb, Ho upconversion nanoparticles （ NaLuF4 ： Yb, Ho NPs） were synthesized by one-step solvothermal method and were characterized. Using as-prepared nanoparticles as an energy donor and Rhodamine B （RhB） as an energy acceptor, a luminescent resonance energy transfer （LRET） system was built. When hydroxyl radical （·OH） was added in the system, RhB was oxidized, leading the break of the LRET system and the luminescence recovery of NaLuF4 ： Yb, Ho NPs. Based on this phenomenon, a new method for the detection of ·OH using NaLuF4：Yb, Ho NPs as nanoprobes was established. The linear range is 1. 00 × 10^-6 - 2. 00 ×10^ -4 mol/L with the detection limit of 2.4 ×10^-7 mol/L. In addition, the antioxidant capacities of several substances were evaluated based on the system.