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Continuous microflow synthesis of fluorescent phosphorus and nitrogen co-doped carbon quantum dots
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Lin, Liangliang, Yin, Yijian, Li, Ziyang, Xu, Hujun, Hessel, Volker and Ostrikov, Kostya Ken (2022) Continuous microflow synthesis of fluorescent phosphorus and nitrogen co-doped carbon quantum dots. Chemical Engineering Research and Design, 178 . pp. 395-404. doi:10.1016/j.cherd.2021.12.037 ISSN 0263-8762.
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WRAP-Continuous-microflow-synthesis-fluorescent-phosphorus-nitrogen-carbon-quantum-dots-submitted.pdf - Submitted Version - Requires a PDF viewer. Download (1633Kb) | Preview |
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WRAP-Continuous-microflow-synthesis-of-fluorescent-phosphorus-and-nitrogen-co-doped-carbon-quantum-dots-Hessel-22.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (5Mb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.cherd.2021.12.037
Abstract
Fluorescent carbon quantum dots (CQDs) doped with heteroatoms are highly promising for diverse applications ranging from bioimaging to environmental sensing. However, the ability for doping and functionalizing CQDs in a continuous, scalable, industry-relevant flow chemistry process, remains limited. Here we overcome this limitation by developing a continuous, facile and efficient method for the preparation of nitrogen and phosphorus co-doped carbon quantum dots (NP-CQDs), using microflow reactors combined with localized, energy-efficient heating of ethanolamine and phosphoric acid aqueous solution. The products are characterized by advanced microanalysis including fluorescence spectrophotometry, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) measurements. The results show ultrasmall fluorescent CQDs with narrow size distribution were successfully prepared, where N and P atoms proved to be effectively doped into the CQDs. The reaction conditions for the continuous synthesis of CQDs are investigated, including the influence of residence time and reaction temperature on the obtained CQDs (particle size, distributions, fluorescence intensity, bandgap energies, conductivity, and fluorescence lifetime) are analyzed. This study is expected to provide guidance for the continuous and controllable preparation of fluorescent CQDs with effective doping of heteroatoms.
Item Type: | Journal Article | ||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Microreactors, Quantum dots, Nanotechnology, Nanostructured materials -- Design and construction, Heat -- Transmission, Chemical processes | ||||||||||||||||||||||||
Journal or Publication Title: | Chemical Engineering Research and Design | ||||||||||||||||||||||||
Publisher: | Elsevier Ltd. | ||||||||||||||||||||||||
ISSN: | 0263-8762 | ||||||||||||||||||||||||
Official Date: | February 2022 | ||||||||||||||||||||||||
Dates: |
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Volume: | 178 | ||||||||||||||||||||||||
Page Range: | pp. 395-404 | ||||||||||||||||||||||||
DOI: | 10.1016/j.cherd.2021.12.037 | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
Copyright Holders: | Elsevier | ||||||||||||||||||||||||
Date of first compliant deposit: | 21 June 2022 | ||||||||||||||||||||||||
Date of first compliant Open Access: | 3 January 2023 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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