Search results for "bioimaging"
showing 7 items of 17 documents
Facile synthesis of L-cysteine functionalized graphene quantum dots as a bioimaging and photosensitive agent
2021
Nowadays, a larger number of aggressive and corrosive chemical reagents as well as toxic solvents are used to achieve structural modification and cleaning of the final products. These lead to the production of residual, waste chemicals, which are often reactive, cancerogenic, and toxic to the environment. This study shows a new approach to the modification of graphene quantum dots (GQDs) using gamma irradiation where the usage of reagents was avoided. We achieved the incorporation of S and N atoms in the GQD structure by selecting an aqueous solution of L-cysteine as an irradiation medium. GQDs were exposed to gamma-irradiation at doses of 25, 50 and 200 kGy. After irradiation, the optical,…
Does the change in the length of the alkyl chain bring us closer to the compounds with the expected photophysical and biological properties? – Studie…
2022
The novel imidazole-based phenothiazine derivatives 3a-3e differing in the length of the alkyl chain at the imidazole substituents were effectively designed and synthesized. The effect of the alkyl chain on the photophysical properties of novel compounds was systematically investigated and supported by TD/DFT calculations. The photophysical characterization of 3a-3e compounds was performed in a series of solvents. Both absorption and fluorescence spectra exhibited positive solvatochromism. Phenothiazine derivatives 3a-3e have a noteworthy emission from blue to yellow region 450–600 nm, high quantum yields 41–93%, lifetimes in nanosecond scale (4.01–7.55 ns), and Stokes shifts in the range o…
Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids
2014
Fluorescent supramolecular hydrogels for biomedical applications
2019
Co-reductive fabrication of carbon nanodots with high quantum yield for bioimaging of bacteria
2018
A simple and straightforward synthetic approach for carbon nanodots (C-dots) is proposed. The strategy is based on a one-step hydrothermal chemical reduction with thiourea and urea, leading to high quantum yield C-dots. The obtained C-dots are well-dispersed with a uniform size and a graphite-like structure. A synergistic reduction mechanism was investigated using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The findings show that using both thiourea and urea during the one-pot synthesis enhances the luminescence of the generated C-dots. Moreover, the prepared C-dots have a high distribution of functional groups on their surface. In this work, C-dots proved …