Development of optical sensing probe for Hg(II) ions detection in ground water using Au, Hexanedithiol and Rhodamine B nanocomposite system

SENSORS AND ACTUATORS B-CHEMICAL

卷:265

Article

Daware, Krishna¹  Shinde, Rakesh¹  Kalubarme, Ramchandra S.¹  Kasture, Manasi^1,4  Pandey, Ashok²  Terashima, Chiaki^1,3  Gosavi, Suresh W.¹ 

[1] Savitribai Phule Pune Univ, Dept Phys, Ctr Adv Studies Mat Sci & Solid State Phys, Pune 411007, Maharashtra, India

[2] Bhabha Atom Res Ctr, Radiochem Div, Bombay 400085, Maharashtra, India

[3] Tokyo Univ Sci, Res Inst Sci & Technol, Photocatalysis Int Res Ctr, 2641 Yamazaki, Noda, Chiba 2788510, Japan

[4] Jampot Photon, Pune 411007, Maharashtra, India

关键词: Hg(II) ion detection;    Functionalized AuNPs;    Absorbance;    Fluorescence;    Rhodamine B;    Hexanedithiol;   

DOI  :  10.1016/j.snb.2018.03.095

来源: Elsevier

【 摘 要 】

Development of simple, sensitive and selective detection probe for Hg(II) ions in natural water is still a challenge to the researchers due to stringent and permissible limits set by World Health Organization (WHO). Herein, highly selective optical (absorbance and fluorescence modes) sensing probe for monitoring Hg(II) ions in synthetic urine and ground water has been successfully demonstrated using gold nanoparticles (AuNPs)/rhodamine B (RB)/hexanedithiol (HDT) nanocomposites system. The incorporation of RB and HDT on AuNPs improved sensitivity and selectivity (1.8 times) towards Hg(II) ions over other metal ions, respectively. The proposed mechanism involved in Hg(II) sensing in absorbance mode was based on aggregation of composites AuNPs, while fluorescence mode was based on the turn on fluorescence approach through release of RB from AuNPs/RB/HDT nanocomposites system via subsequent formation of Hg-HDT complex. The linear dynamic range for detection of Hg(II) ions using AuNPs/RB/HDT nanocomposite system, when tested in optimized colorimetric and fluorescence based analytical method adopted to the Hg(II) spiked urine and ground water samples exhibited detection limit of 1 ng mL(-1) (1 ppb) and 0.5 ng mL(-1) (0.5 ppb) using absorption and fluorescence mode, respectively, which were significantly comparable to those used in other developed Hg detection probes. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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