Carbon nanodots, a class of carbon nano-allotropes, have been synthesized through different routes and methods from a wide range of precursors. The selected precursor, synthetic method and conditions can strongly alter the physicochemical properties of the resulting material and their intended applications. Herein, carbon nanodots (CNDs) have been synthesized from D-Glucose by combining pyrolysis and chemical oxidation methods. The effect of the pyrolysis temperature, equivalents of oxidizing agent and refluxing time were studied on the product and quantum yield. In the optimum conditions (pyrolysis temperature of 300°C, 4.41 equivalents of H₂O₂, 90 minutes of reflux) CNDs were obtained with 40% and 3.6% of product and quantum yields respectively. The obtained CNDs are negatively charged (ζ-potential = - 32 mV), excellently dispersed in water, with average diameter of 2.2 nm. Furthermore, ammonium hydroxide (NH₄OH) was introduced as dehydrating and/or passivation agent during CNDs synthesis resulting in significant improvement of both product and quantum yields of about 1.5 and 3.76-fold respectively.

The synthesized CNDs showed a broad-spectrum of antibacterial activities toward different gram-positive and gram-negative bacteria strains. Both synthesized CNDs caused highly colony forming unit reduction (CFU), ranging from 98 to 99.99% for most of the tested bacterial strains.

Title

ACS Applied Bio Materials

Publisher

ACS

Publisher Country

United States of America

Indexing

Thomson Reuters

Impact Factor

4.7

Publication Type

Both (Printed and Online)

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Year

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