Upconverting nanoparticle based optical sensor for carbon dioxide
Upconverting nanoparticle based optical sensor for carbon dioxide
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DOI：
10.1016/j.snb.2010.07.031
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发表时间：
2010-09-21
影响因子：
8.4
通讯作者：
Wolfbeis, Otto S.
中科院分区：
文献类型：
--
作者：
Ali, Reham;Saleh, Sayed M.;Wolfbeis, Otto S.
我们展示了一种新型的二氧化碳光学传感器，其关注率在0和3%之间。该传感方案基于对含有NaYF4Yb型上转换纳米粒子(UCNP，尺寸40-100 nm)的12微米聚苯乙烯(PS)膜的光学询问，选择阴离子(蓝)形式的长波吸收pH探针溴百里酚蓝(BTB)作为基质，是因为它对CO2具有渗透选择性，并抑制了MON。在PS基质中，BTB的颜色取决于CO2气体的分压。UCNPs用980 nm的激光二极管光激发产生绿色(542 Nm)和红色(657 Nm)的发射，由于内过滤效应，其强度被屏蔽(取决于BTB是否以蓝01黄的形式存在)。UCNPs在542 nm和657 nm的发光强度随着CO2浓度的增加而增加PH探针BTB(一种磺酸盐)以亲脂离子对的形式与四丁基铵阳离子(TBA)一起使用。将强碱性四辛基氢氧化铵加入体系中，作为碱将BTB转化为其酚氧化物(蓝色)形式。而且还创造了一个缓冲系统这是第一个基于UCNPS的CO2光学传感器它的响应时间类似于10s在纯Ar气体中切换到1%的CO2气体中，传感膜的恢复时间类似于180 S，检测下限为CO_2(C)2010Elsevier B V版权所有
We demonstrate a novel optical sensor for carbon dioxide in concern rations between 0 and 3% The sensing scheme is based on the optical interrogation of a 12-mu m polystyrene (PS) film containing upconverting nanoparticles (UCNPs, 40-100 nm in size) of the type NaYF4 Yb,Er, and the longwave absorption pH probe bromothymol blue (BTB) in its anionic (blue) form PS is chosen as a matrix because it displays permeation selectivity for CO2 and rejects morons The color of BTB in the PS matrix depends on the partial pressure of CO2 gas the UCNPs are photoexcited with a 980-nm laser diode to give a green (542 nm) and a red (657 nm) emission whose intensity is screened off (depending on whether BTB is present in as blue 01 yellow form) due to an inner filter effect The luminescence intensities of the UCNPs at 542 nm and 657 nm increase with increasing concentration of CO2 The pH probe BTB (a sulfonate) is used in the form of a lipophilic ion pair with the tetrabutylammonium cation (TBA) The strong base tetraoctylammonium hydroxide is added to the system and acts as a base to convert BTB in its phenoxide (blue) form. but also creates a buffer system This is the first optical sensor for CO2 that is based on the use of UCNPs Its response time is similar to 10s on switching from pure argon gas to 1% CO2 in argon, the recovery time of the sensing film is similar to 180 s, and the detection limit is 0 11% of CO2 (C) 2010 Elsevier B V All rights reserved