期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 50, 页码 59747-59760出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c19995
关键词
carbon dots; cross-linking; luminescence; cellular uptake; hyperspectral dark-field microscopy; multichannel sensor array
This study presents a facile synthetic methodology for preparing multicolor carbon dots by controlling their optical properties through surface-state cross-linking of carboxylic acid groups. The changes in cellular internalization of these cross-linked CDs were demonstrated and validated using various characterization tools. Additionally, a triple-channel sensor array was fabricated to confirm the surface-state controlled PL mechanisms of these CDs for the identification of different analytes.
We disclose for the first time a facile synthetic methodology for the preparation of multicolor carbon dots (CDs) from a single source barring any chromatographic separations. This was achieved via sequential intraparticle cross-linking of surface abundant carboxylic acid groups on the CDs synthesized from a precursor to control their photoluminescence (PL) spectra as well as affect their degree of cellular internalization in cancer cells. The change in PL spectra with sequential cross-linking was projected by theoretical density functional theory (DFT) studies and validated by multiple characterization tools such as X-ray photoelectron spectroscopy (XPS), PL spectroscopy, ninhydrin assay, etc. The variation in cellular internalization of these cross-linked CDs was demonstrated using inhibitor assays, confocal microscopy, and flow cytometry. We supplemented our findings with high-resolution dark-field imaging to visualize and confirm the colocalization of these CDs into distinct intracellular compartments. Finally, to prove the surface-state controlled PL mechanisms of these cross-linked CDs, we fabricated a triple-channel sensor array for the identification of different analytes including metal ions and biologically relevant proteins.
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