Fluorescently tuned nitrogen-doped carbon dots from carbon source with different content of carboxyl groups

Abstract

In this study, fluorescent nitrogen-doped carbon dots (NCDs) were tuned via varying the sources with different number of carboxyl groups. Owing to the interaction between amino and carboxyl, more amino groups conjugate the surface of the NCDs by the source with more carboxyl groups. Fluorescent NCDs were tuned via varying the sources with different content of carboxyl groups. Correspondingly, the nitrogen content, fluorescence quantum yields and lifetime of NCDs increases with the content of carboxyl groups from the source. Furthermore, cytotoxicity assay and cell imaging test indicate that the resultant NCDs possess low cytotoxicity and excellent biocompatibility.

Carbon Dots from Citric Acid and its Intermediates Formed by Thermal Decomposition

“…Control of the C‐dots′ photostability through the design of the surface state is another challenging task, which requires the capability to correlate the emission with the C‐dots structure and surface …”

“…Control of the C-dots' photostability through the design of the surface state is another challenging task, which requires the capability to correlate the emission with the C-dots structure and surface. [15] The functionalisation of the citrate-based C-dots with organosilanes to stabilise the opticalp ropertiesa nd to be employed in sol-gel processed hybrid organic-inorganicm aterials appears, therefore, to be av ery important issue. [16][17][18] Functionalisationw ith organosilanes modifies the opticalr esponse, but ap recise correlation is still far to be defined.…”

Enhanced antibacterial activity of carbon dots functionalized with ampicillin combined with visible light triggered photodynamic effects

“…The UV-Vis and fluorescence spectra of CDs-NH2 and CDs-AMP conjugate are depicted in Figure 1A. UV-vis absorption spectrum of CDs-NH2 exhibits three bands at 237, 342 and 450 nm due to the →* transition of aromatic C=C bond, n→* transition of the C=O bond and to amine-functionalized surface of the CDs [48][49][50][51], while the absorption of ampicillin is below 260 nm.…”

Different toxicity of cadmium telluride, silicon, and carbon nanomaterials against hemocytes in silkworm, Bombyx mori

“…29,30 Citric-acidnitrogen-doped carbon dots (C-NCDs) were synthesized by Professor Zou's team at the College of Physics, Optoelectronics, and Energy at Soochow University. Their characteristics have been reported by Zhong et al, 29 Liu et al, 20 and Wang et al 31 respectively. The corresponding hydrodynamic diameters of the CdTe QDs, SiNPs, and C-NCDs were 4, 2.2, and 11.4 nm, respectively, and their maximum luminescent wavelengths were 530, 450, and 514 nm, respectively.…”