Details

Autor(en) / Beteiligte

• Raj, S. Irudhaya
• Jaiswal, Adhish
• Uddin, Imran

Titel

Ultrasmall aqueous starch-capped CuS quantum dots with tunable localized surface plasmon resonance and composition for the selective and sensitive detection of mercury() ions

Ist Teil von

• RSC advances, 2020-04, Vol.1 (24), p.145-1459

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Ultrasmall starch-capped CuS quantum dots (QDs) with controllable size were chemically fabricated in an aqueous medium. The phase of the CuS QDs was confirmed via X-ray diffraction (XRD), whereas the characteristic localized surface plasmon resonance (LSPR) peak in the near-infrared (NIR) region was measured using UV-Vis spectroscopy. Transmission electron microscopy and high bandgap analysis confirmed the formation of ultrasmall CuS QDs in the size range of 4-8 nm. CuS QDs have been used for the selective and sensitive detection of Hg 2+ ions through colorimetric and spectroscopic techniques. The selective sensing of Hg 2+ ions from various metal ions was detected via a remarkable change in color, damping in LSPR intensity, significant change in the Fourier-transform infrared spectra and X-ray photoelectron spectroscopic measurements. The mechanism of interaction between the CuS QDs and Hg 2+ ions has been deeply explored in terms of the role played by the starch and the reorganization of sulfide and disulfide bonds to facilitate the access of Hg 2+ ions into the CuS lattice. Finally, an intermediate Cu 2− x Hg x S nanostructure resulted in the leaching of Cu + ions into the solution, which were further recovered and reused for the formation of fluorescent Cu 2 S nanoparticles. Thus, the entire process of synthesis, sensing and reuse paves the way for sustainable nanotechnology. Colorimetric response of CuS QDs with mercury ions.