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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >A fluorescence ratiometric nano-pH sensor based on dual-fluorophore-doped silica nanoparticles
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A fluorescence ratiometric nano-pH sensor based on dual-fluorophore-doped silica nanoparticles

机译：基于双荧光团掺杂的二氧化硅纳米粒子的荧光比例纳米pH传感器

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摘要

We have synthesized dual-fluorophore-doped core-shell silica nanoparticles used as ratiometric pH sensor. The nanoparticles were prepared with a reverse nucroemulsion technique by simultaneously encapsulating two different fluorophores, the pH-sensitive dye fluorescein as a pH indicator and the pH-insensitive dye phenosafranine as an internal reference for fluorescence ratiometric measurement, into silica shell. The nanoparticles prevent the fluorescence dyes leaching from the silica matrix when immersed inside water. The hydrophilic silica shells were made by hydrolysing and polymerizing tetraethoxysilane (TEOS) in water-in-oil microemulsion. The fluorescence intensity ratio of the two dyes varied linearly as a function of pH in the range from 4.0 to 8.0. The sensor was also applied to measure pH of real water samples. The results are in good agreements with that using the conventional glass electrode method. The as-prepared fluorescent nanoparticles showed rapid response, excellent stability and high reproducibility as pH sensors. (C) 2006 Elsevier B.V. All rights reserved.
机译：我们已经合成了双荧光团掺杂的核壳二氧化硅纳米粒子，用作比例pH传感器。通过同时将两种不同的荧光团（pH敏感染料荧光素作为pH指示剂和pH敏感染料phenosafranine作为内参用于荧光比例法测量）封装到二氧化硅壳中，使用反向核乳化技术制备纳米颗粒。纳米粒子可防止荧光染料浸入水中时从二氧化硅基质中浸出。亲水性二氧化硅壳是通过在油包水微乳液中水解并聚合四乙氧基硅烷（TEOS）制成的。两种染料的荧光强度比随pH在4.0至8.0范围内线性变化。该传感器还用于测量真实水样的pH值。结果与使用常规玻璃电极法的结果吻合良好。所制备的荧光纳米颗粒作为pH传感器显示出快速响应，出色的稳定性和高重现性。 （C）2006 Elsevier B.V.保留所有权利。

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