CdTe quantum dots functionalized with 4-amino-2,2,6,6-tetramethylpiperidine-N-oxide as luminescent nanoprobe for the sensitive recognition of bromide ion

被引:11
作者
Adegoke, Oluwasesan [1 ]
Hosten, Eric [2 ]
McCleland, Cedric [2 ]
Nyokong, Tebello [1 ]
机构
[1] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa
[2] Nelson Mandela Metropolitan Univ, Dept Chem, ZA-6031 Port Elizabeth, South Africa
基金
新加坡国家研究基金会;
关键词
Tetramethylpiperidine-N-oxide; Fluorescence quenching; Quantum dots; Glutathione; Bromide; DISINFECTION BY-PRODUCTS; CDSE; CHROMATOGRAPHY; WATER; NANOCRYSTALS; SEPARATION; BROMATE; NITRITE; SAMPLES; PROBES;
D O I
10.1016/j.aca.2012.01.040
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A novel bromide ion-selective modified nanoprobe sensor based on 4-amino-2,2,6,6-tetramethylpiperidine-N-oxide (4AT)-functionalized CdTe quantum dots (QDs-4AT) has been developed. Fluorescence quenching of the QDs by 4AT was observed. The functionalized QDs-4AT nanoprobe allowed a highly sensitive determination of bromide ion via analyte-induced change in the photoluminescence (fluorescence recovery) of the modified QDs. A detection limit of 0.6 nM of bromide ion was obtained, while the interfering effect of other inorganic cations and anions was investigated to examine the selectivity of the nanoprobe. The linear range was between 0.01 and 0.13 mu M. Combined fluorescence lifetime and electron paramagnetic resonance measurements confirmed electron transfer processes between bromide ion and QDs-4AT. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:154 / 161
页数:8
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