Fluorescent Carbon Dots as Innovative Nano-platform for Multifunctional Applications

Vijay Bhooshan Kumar vijaybhushan86@gmail.com 1,2 Aharon Gedanken 1,2 D. Aurbach 2 Y. Shavtal 2,3 E. Banin 2,3 S. Michaeli 2,3 O. Safi 2,4 D. Karasik 5 Z. Porat 6 V.G. Pol 7
1Department of Chemistry, Bar-Ilan University, Ramat Gan, Tel-Aviv, Israel
2Bar Ilan Institute for Nantechnology, Bar Ilan Institute for Nanotechnology, Ramat Gan, Israel
3Department of Life Science, Bar Ilan University, Ramat Gan, Israel
4School of Engineering, Bar Ilan University, Ramat Gan, Israel
5Bar Ilan Medical School, Bar Ilan University, Ramat Gan, Israel
6Department of Chemistry, Nuclear Research Center Negev, Negev, Israel
7Chemical Engineering Dept., Purdue University, Indiana, USA

Vijay Bhooshan Kumar1,2, D. Aurbach1,2, Y. Shavtal2,3, E. Banin2,3 O. Safi2,4, D. Karasik5, Z. Porat6, V. G. Pol7, Aharon Gedanken1,2

Sonochemistry has been used to develop a one-pot synthesis of carbon dots (C-dots) and doped C-dots based materials. It is demonstrated how various experimental parameters, such as the sonication time, the temperature and the power of sonication affect the size of the C-dots (2-10 nm) and their fluorescence properties. The highest measured quantum yield of emission was ~16-44%. Similarly, we synthesized C-dots doped with metals (Ga, In, Sn) and non-metals (N, P, S) for various physical, chemical, and biomedical applications. The synthesized C-dots were coated on polythene, Si-wafer, glass substrate, and activated carbon (AC). Electrodes made of AC/C-dots demonstrated specific capacitance of 0.185 F.g-1.cm-2, almost 3 times higher than unmodified carbon. The Sn@C-dots@Sn nanoparticles were synthesized and directly deposited on the copper foil current collector as a promising anode for Li-ion batteries. C-dots/TiO2 materials were synthesized and used for photocatalytic activity. The Ga doped in C-dots (Ga@C-dots) and used for antimicrobial activity against free-living P. aeruginosa bacteria. Ga@C-dots was reflected full inhibition of the bacterial growth at the much lower concentration of Ga within Ga@C-dots. Furthermore, we have also synthesized the N doped C-dots (N@CDs) by hydrothermally reacting an aqueous solution of Bovine Serum Albumin (BSA) with high quantum yield (44 %), high photostability, colloidal stability, and high functionalization efficiency. However, only a few studies have been focused on assessing the fluorescence of N@CDs during in-vivo exposure. Strong fluorescence emission from Zebra Fish (ZF) embryos and larvae successfully confirms the distribution of N@CDs in ZF. Finally, it is concluded that our novel fabricated C-dots and doped C-dots based materials were used for the various applications such as supercapacitor, rechargeable batteries, photocatalysis, biodiesel production, astaxanthin production, antibacterial activity, neuron cell growth, and live cell imaging.









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