j7

e-ISSN: 2590-4132

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Honorary Editor

M. Nayfeh (USA)

Editor-in-Chief

Y. Al-Douri

Email: yarub.a@siats.co.uk

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S. Abdullah (Malaysia)

O. Alani (UK)

T. Al Smadi (Jordan)

M. Ameri (Algeria)

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A. Chaudhry (India)

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D. Chua (Singapore)

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Y. P. Feng (Singapore)

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R. Jose (Malaysia)

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M. A. R. Khan (USA)

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M-B Leptit (France)

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P. Schwerdtfeger (New Zealand)

U. Schwingenschloegl (Germany)

T. E. Simos (Greece)

J. Sing (Australia)

P. R. Somani (India)

M. Tanemura (Japan)

N. Tit (UAE)

K. D. Verma (India)

S. Wang (Singapore)

J. Whitaker (USA)

A. Zaoui (France)

D. H. Zhang (Singapore)

Tunable carbon quantum dots from starch via microwave assisted carbonization

Tunable luminescence carbon dots (C-dots) were prepared through microwave-assisted carbonization of aqueous starch suspension mediated by sulfuric and phosphoric acids respectively as surface passivating agents. The as-prepared C-dots showed green, blue and yellow luminescence under 365nm UV light. The C-dots were further characterized by UV-Vis, FTIR, and band gap determination. Fourier transform infrared spectroscopy (FTIR) studies revealed bands at 3460 cm-1 (OH), 2979 cm-1 1708 cm-1 (C=O), 1188 and 1040cm-1 (C-O), and 1397 cm-1

(C=C) indicative of the graphitic nature of the carbon. The UV-Vis showed blue shifted absorption bands, while the band gap calculated revealed narrow sizing of the C-dots in the semiconductor
range. The results suggest that this approach may serve as a facile route to colour tunable photoluminescent C-dot materials with potential biological applications.

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