A circular dichroism sensor for selective detection of Cd2+ and S2- based on the in-situ generation of chiral CdS quantum dots

作者：Sianglam Pradthana; Kulchat Sirinan; Tuntulani Thawatchai; Ngeontae Wittaya

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2017, 183: 408-416.

DOI：10.1016/j.saa.2017.04.071

• Quantum dots
• Chiral nanoparticle
• Circular dichroism sensor
• Chemical sensor
• Heavy metal ions
• Sulfide ion

We demonstrate an advance in the fabrication of circular dichroism (CD) sensors for detection of Cd2+ and S2- based on chiral CdS quantum dots (QDs) generated by a facile in-situ reaction. The chiral quantum dots are generated in solutions composed of S2-, S2-, cysteamine (CA) and L-penicillamine (L-PA), with the number of the generated particles limited by either the S2- or S2- concentration. We show that the magnitude of the CD signal produced by the QDs is linearly related to the initial concentration of S2- and S2-, with excellent selectivity over other ions. Our sensor functions over concentration ranges of 65-200 pM and 7-125 pM with detection limits of 59.7 and 1.6 pM for S2- and S2-, respectively. The sensor is applied in real water samples with results comparing favorably with those obtained from ICP-OES (for S2-) and HPLC (for S2-).

• 出版日期2017-8-5