NDLI: Protein-directed synthesis of NIR-emitting, tunable HgS quantum dots and their applications in metal-ion sensing.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Goswami, Nirmal Giri, Anupam Kar, Shantimoy Bootharaju, Megalamane Siddaramappa John, Robin Xavier, Paulrajpillai Lourdu Pradeep, Thalappil Pal, Samir Kumar
Description	Country affiliation: India Author Affiliation: Goswami N ( Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098, India.)
Abstract	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 UV-vis 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 680-800 nm spectral regions, with a quantum yield of 4-5%. 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.
File Format	HTM / HTML
ISSN	16136810
Issue Number	20
Volume Number	8
e-ISSN	16136829
Journal	Small
Language	English
Publisher	Wiley-VCH
Publisher Date	2012-10-22
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Nanotechnology Mercury Chemistry Quantum Dots Copper Spectrometry, X-ray Emission Spectroscopy, Fourier Transform Infrared Spectrum Analysis, Raman Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Medicine Biomaterials Engineering Biotechnology

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