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Ultrafast Fluorescence Dynamics of Highly Stable Copper Nanoclusters Synthesized Inside the Aqueous Nano-Pool of Reverse Micelles Raj Kumar Koninti, Sagar Satpathi, and Partha Hazra J. Phys. Chem. C, Just Accepted Manuscript • DOI: 10.1021/acs.jpcc.7b11457 • Publication Date (Web): 21 Feb 2018 Downloaded from http://pubs.acs.org on February 21, 2018
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The Journal of Physical Chemistry
Ultrafast Fluorescence Dynamics of Highly Stable Copper Nanoclusters Synthesized Inside the Aqueous Nano-Pool of Reverse Micelles Raj Kumar Koninti, Sagar Satpathi and Partha Hazra*$# $
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune (411008), Maharashtra, India #
Centre for Energy Science, Indian Institute of Science Education and Research (IISER), Pune (411008), Maharashtra, India
*Corresponding author E-mail:
[email protected] Tel.: +91-20-2590-8077; Fax: +91-20-2589 9790. 1 ACS Paragon Plus Environment
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ABSTRACT Herein, we have reported a new strategy for the synthesis of highly stable fluorescent copper nanoclusters (CuNCs) with L-cysteine (Cys) as a protecting ligand within the water nanopool of reverse micelles (RMs). In the present work, efforts are also given to address the origin of excitation-dependent fluorescence spectral shift of CuNCs. From our experiments, we have elucidated that the broad fluorescence from CuNCs in RM consists of two spectrally overlapped bands corresponding to the metal-core and surface states of CuNCs. The intrinsic emission of CuNCs distributed in shorter wavelength regions (470 nm) is caused by surface states and consists of a much broader emission due to the presence of numerous surface states. The trapping of excited electrons in the various surface states leads to the emission in the longer wavelength regions and is believed to be responsible for excitation dependent emission of CuNCs in RMs. Excited state dynamics, which controls the optical properties of CuNCs, have also been investigated by time correlated single photon counting (TCSPC)
and
femtosecond
fluorescence
up-conversion
techniques.
Femto-second
fluorescence up-conversion and TCPSC decay profiles of CuNCs comprise of multitude of lifetime components spanning from
