Surface molecular imprinting on CdTe quantum dots for fluorescence sensing of 4-nitrophenol. Issue 10 (23rd February 2016)

• Record Type: Journal Article
• Authors: Jiang, Linye; Liu, Haijian; Li, Ming; Xing, Yue; Ren, Xueqin
• Is Part Of: Analytical methods. Volume 8:Issue 10(2016)
• Page Start: 2226
• Page End: 2232
• Publication Date: 2016-02-23
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c5ay03160e
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : The developed fluorescent sensor provides high sensitivity and selectivity and a lower detection limit than previously developed sensors. Abstract : We tested a simple and economical approach to synthesize CdTe quantum dots (QDs). We then developed a MIP-capped CdTe QD fluorescent sensor by anchoring a molecularly imprinted polymer (MIP) layer on the surface of CdTe QDs using 3-aminopropyltriethoxysilane as the functional monomer and tetramethoxysilane as the cross-linker via a surface molecular imprinting process. The sensor possessed the sensitivity of CdTe QDs, the selectivity of the molecular imprinting technique, and a nearly spherical morphology. The fluorescence of the MIP-capped CdTe QDs can be efficiently quenched when the template 4-nitrophenol (4-NP) rebinds to the binding sites, as a result of the charge transfer from QDs (donor) to 4-NP (acceptor). MIP-capped CdTe QDs generated a significantly reduced fluorescence intensity within the initial 12 min of binding 4-NP. Under optimized conditions, the sensor presented a satisfactory linearity with 4-NP concentrations in the range of 1–30 μM, and the detection limit was 40 nM. The sensor also successfully detected trace amounts of 4-NP in water samples, and the recovery of 4-NP in three spiked samples ranged from 95.1% to 98.1% with relative standard deviations below 4.3%. The results provide an alternative method for the development of sensors for the rapid recognition and determination of 4-NP in water samples.