Fabrication of amine functionalized CdSe@SiO2 nanoparticles as fluorescence nanosensor for highly selective and sensitive detection of picric acid

Wen Gong; Hang Li; Xiaoming Gong; Zaipeng Zhang; Zhiyan Lu

doi:10.1016/j.saa.2020.118221

Fabrication of amine functionalized CdSe@SiO₂ nanoparticles as fluorescence nanosensor for highly selective and sensitive detection of picric acid

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Jun 5:233:118221. doi: 10.1016/j.saa.2020.118221. Epub 2020 Mar 2.

Authors

Wen Gong¹, Hang Li², Xiaoming Gong², Zaipeng Zhang³, Zhiyan Lu⁴

Affiliations

¹ Department of Cardiology, The Third People's Hospital of Hubei Province Wuhan, 430030, China.
² Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei Province, People's Republic of China.
³ Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei Province, People's Republic of China. Electronic address: [email protected].
⁴ Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei Province, People's Republic of China. Electronic address: [email protected].

PMID: 32151984
DOI: 10.1016/j.saa.2020.118221

Abstract

In this work, amino functionalized CdSe-silica core-shell nanoparticles (NH₂-CdSe@SiO₂ NPs) were constructed as probe to detect picric acid (PA). The CdSe QDs were embedded in SiO₂ nanoparticles and modified with amino groups on the surface. The nitro explosives are electron deficient in nature, which will have stronger affinity for amines and resulted in fluorescence quenching of quantum dots. It was proved that this strategy is selective, easy and sensitive enough for sensing PA with a detection limit of 0.5 × 10^-7 M.

Keywords: CdSe quantum dots; Core–shell structure; Fluorescence quenching; Nanoparticles; PA; Sensors.