Title:	Self-Assembly of carbon quantum dots into C8-structured nanosheets
Authors:	Mary, K A Ann Palakulam, Joyal Jain Philip, Reji
Keywords:	Carbon nanosheets Cubic C8 2D carbon Crystalline carbon Cu2+ sensor Fluorescence sensing
Issue Date:	Mar-2025
Publisher:	Carbon
Citation:	Carbon, 2025, Vol.234, AR No.119991
Abstract:	Among carbon family, development of carbon nanosheets through a green and simple method is a great challenge, owing to the ineffective synthetic approaches. Furthermore, though various carbon nanosheets are reported as highly efficient energy storage systems, other than graphitic carbon nitride, 2D carbon structures are seldom fluorescent. Here, C8 structured carbon nanosheets were synthesized from self-assembly of biomass derived carbon quantum dots. Their formation and assembly into non-graphitic crystalline 2D structures were investigated in detail with XRD spectra. While addition of PVP incited the formation of crystalline C8 structure, the presence of urea inhibited their growth. Moreover, the PVP could alter the morphology of nanosheets to nanoparticles with same cubic C8 structure. Both nanosheets and nanoparticles exhibited broad blue fluorescence similar to emission spectra exhibited by carbon quantum dots. The fluorescence intensity of C8 nanoparticles were selectively quenched after addition of Cu2+ ions and with a limit of detection of 103 nM. Phytotoxicity and cytotoxicity study of obtained nanosheets confirmed the potential behaviour of nanosheets for biomedical applications.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/8471
ISSN:	0008-6223 1873-3891 (online)
Alternative Location:	http://dx.doi.org/10.1016/j.carbon.2025.119991
Copyright:	2025 Elsevier Ltd.
Appears in Collections:	Research Papers (LAMP)

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