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Type: Journal article
Title: Rational design for the microplasma synthesis from vitamin B9 to N-doped carbon quantum dots towards selected applications
Author: Pho, Q.H.
Lin, L.L.
Tran, N.N.
Tran, T.T.
Nguyen, A.H.
Losic, D.
Rebrov, E.V.
Hessel, V.
Citation: Carbon, 2022; 198:22-33
Publisher: Elsevier
Issue Date: 2022
ISSN: 0008-6223
Statement of
Quoc Hue Pho, LiangLiang Lin, Nam Nghiep Tran, Tung T. Tran, An Hoa Nguyen, Dusan Losic, Evgeny V. Rebrov, Volker Hessel
Abstract: N-doped carbon quantum dots (NCQD) are rationally designed and synthesised, for the first time, from folic acid (Vitamin B9) by a non-thermal microplasma jet. A new conceptual design was developed to synthesise the desirable NCQD for three main applications (nanopesticides, water purification, and theranostic treatment). The structural and analytical characterisation confirmed an average size of 3.1 nm for the synthesised NCQD with the multi-functional groups (-OH, –COOH, –NH2) on their surface. The TEM results indicated that the core of NCQD was a multilayered structure, including single defected graphene sheets of graphitic-nitrogen and pyrrolicnitrogen. In addition, fluorescence performance and stability of the as-prepared NCQD were determined. The quantum yield of NCQD was 35%, which is relatively high, with a strong blue fluorescence. A basis for predicting colloidal behaviours based on balancing molecular attractive and repulsive forces was elucidated by applying the Derjaguin, Landau, Vervey, and Overbeek (DLVO) theory. Finally, compared with other similar microplasmaassisted synthesis processes, this developed method has proven the ability to provide a tailored and scalable synthesis process of high-quantum-yield NCQD at gram-scale production.
Keywords: Nonthermal microplasma; NCQD; Rational design; Quantum materials; Quantum dots
Description: Available online 8 July 2022
Rights: © 2022 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.carbon.2022.07.004
Appears in Collections:ARC Research Hub for Graphene Enabled Industry Transformation publications
Chemical Engineering publications

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