Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00119558" target="_blank" >RIV/00216224:14310/21:00119558 - isvavai.cz</a>

Alternative codes found

RIV/68081723:_____/21:00547362 RIV/00216305:26620/21:PU142717

Result on the web

<a href="https://pubs.acs.org/doi/10.1021/acs.jpcc.1c06029#" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.jpcc.1c06029#</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.1c06029" target="_blank" >10.1021/acs.jpcc.1c06029</a>

Result language

angličtina

Original language name

Exploring the Emission Pathways in Nitrogen-Doped Graphene Quantum Dots for Bioimaging

Original language description

Graphene quantum dots (GQDs) with tunable fluorescence emission promise excellent bioapplication potential, especially in bioimaging. We report the synthesis of nitrogen-doped GQDs (N-GQDs) from glucose and ethylenediamine, cheap and safe chemicals, using a one-step and fast microwave-assisted hydrothermal method. Our N-GQDs exhibit fluorescence in the entire visible spectral region, which extends to near-ultraviolet and slightly to near-infrared. Since the origin of fluorescence and its relation to the structure and synthesis conditions are not yet fully understood, we also concentrated on the fluorescence mechanism explanation. Structural characterization with steady-state and time-resolved photoluminescence measurements indicated that band-to-band transitions, size effect, and different nitrogen and oxygen functional groups play a role in this multicolor emission. Remarkably, we found for the first time the evidence that directly relates a change in the N-GQD work function to the change in oxygen groups under UV irradiation via ultraviolet photoelectron spectroscopy. Thus, we confirmed that for λex ≲ 380 nm, photooxidation processes occurred, which led to chemical modification, thereby lowering the work function in the N-GQDs. The N-GQDs were proved to be highly biocompatible by a cell viability assay using vascular smooth muscle cells. Together with the wide spectral range emission observed in confocal fluorescence imaging, it demonstrated the potential of the N-GQDs for in vitro bioimaging applications.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Volume of the periodical

125

Issue of the periodical within the volume

38

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

21044-21054

UT code for WoS article

000704295900032

EID of the result in the Scopus database

2-s2.0-85116600513