期刊
SMALL
卷 8, 期 20, 页码 3175-3184出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201200760
关键词
HgS quantum dots; sensors; mercury; copper; photoinduced electron transfer; Dexter energy transfer
类别
资金
- CSIR, India
- UGC, India
- DST [SR/SO/BB-15/2007]
The development of luminescent mercury sulfide quantum dots (HgS QDs) through the bio-mineralization process has remained unexplored. Herein, a simple, two-step route for the synthesis of HgS quantum dots in bovine serum albumin (BSA) is reported. The QDs are characterized by UVvis spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, luminescence, Raman spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), circular dichroism (CD), energy dispersive X-ray analysis (EDX), and picosecond-resolved optical spectroscopy. Formation of various sizes of QDs is observed by modifying the conditions suitably. The QDs also show tunable luminescence over the 680800 nm spectral regions, with a quantum yield of 45%. The as-prepared QDs can serve as selective sensor materials for Hg(II) and Cu(II), based on selective luminescence quenching. The quenching mechanism is found to be based on Dexter energy transfer and photoinduced electron transfer for Hg(II) and Cu(II), respectively. The simple synthesis route of protein-capped HgS QDs would provide additional impetus to explore applications for these materials.
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