One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging

High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject...

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Autores principales:	Huaidong Wang, Chong Qi, Ailing Yang, Xiaoxu Wang, Jie Xu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ultrasonic-assisted hydrothermal nitrogen doped graphene quantum dots optical properties photo-stability cell imaging Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/54f1a8cc20f14cb39915963888f973bc
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spelling	oai:doaj.org-article:54f1a8cc20f14cb39915963888f973bc2021-11-25T18:29:54ZOne-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging10.3390/nano111127982079-4991https://doaj.org/article/54f1a8cc20f14cb39915963888f973bc2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2798https://doaj.org/toc/2079-4991High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject to photo-bleaching, temperature, pH and preservation period for the N-GQDs were investigated in detail using various microscopy and spectroscopy techniques. The results showed that the N-GQDs possessed an average size of 2.65 nm, 3.57% N doping, and up to 54% quantum yield (QY). The photoluminescence (PL) spectra of the N-GQDs are excitation dependent when excited in the range of 300–370 nm and excitation independent in the range of 380–500 nm for the core and surface states emission. The N-GQDs showed excellent photo-bleaching resistance and superior photo-stability. At room temperature and in the pH range of 3–8, the fluorescence of the N-GQDs was almost invariable. The N-GQDs can be stably preserved for at least 40 days. The average decay lifetime of the N-GQDs was 2.653 ns, and the radiative and nonradiative decay rate constants were calculated to be 2.04 × 10<sup>8</sup> s<sup>−1</sup> and 1.73 × 10<sup>8</sup> s<sup>−1</sup>, respectively. The PL mechanism was qualitatively explained. The N-GQDs was used for cell imaging, and it showed good results, implying great potential applications for bioimaging or biomarking.Huaidong WangChong QiAiling YangXiaoxu WangJie XuMDPI AGarticleultrasonic-assisted hydrothermalnitrogen doped graphene quantum dotsoptical propertiesphoto-stabilitycell imagingChemistryQD1-999ENNanomaterials, Vol 11, Iss 2798, p 2798 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ultrasonic-assisted hydrothermal nitrogen doped graphene quantum dots optical properties photo-stability cell imaging Chemistry QD1-999
spellingShingle	ultrasonic-assisted hydrothermal nitrogen doped graphene quantum dots optical properties photo-stability cell imaging Chemistry QD1-999 Huaidong Wang Chong Qi Ailing Yang Xiaoxu Wang Jie Xu One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
description	High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject to photo-bleaching, temperature, pH and preservation period for the N-GQDs were investigated in detail using various microscopy and spectroscopy techniques. The results showed that the N-GQDs possessed an average size of 2.65 nm, 3.57% N doping, and up to 54% quantum yield (QY). The photoluminescence (PL) spectra of the N-GQDs are excitation dependent when excited in the range of 300–370 nm and excitation independent in the range of 380–500 nm for the core and surface states emission. The N-GQDs showed excellent photo-bleaching resistance and superior photo-stability. At room temperature and in the pH range of 3–8, the fluorescence of the N-GQDs was almost invariable. The N-GQDs can be stably preserved for at least 40 days. The average decay lifetime of the N-GQDs was 2.653 ns, and the radiative and nonradiative decay rate constants were calculated to be 2.04 × 10<sup>8</sup> s<sup>−1</sup> and 1.73 × 10<sup>8</sup> s<sup>−1</sup>, respectively. The PL mechanism was qualitatively explained. The N-GQDs was used for cell imaging, and it showed good results, implying great potential applications for bioimaging or biomarking.
format	article
author	Huaidong Wang Chong Qi Ailing Yang Xiaoxu Wang Jie Xu
author_facet	Huaidong Wang Chong Qi Ailing Yang Xiaoxu Wang Jie Xu
author_sort	Huaidong Wang
title	One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
title_short	One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
title_full	One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
title_fullStr	One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
title_full_unstemmed	One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging
title_sort	one-pot synthesis of bright blue luminescent n-doped gqds: optical properties and cell imaging
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/54f1a8cc20f14cb39915963888f973bc
work_keys_str_mv	AT huaidongwang onepotsynthesisofbrightblueluminescentndopedgqdsopticalpropertiesandcellimaging AT chongqi onepotsynthesisofbrightblueluminescentndopedgqdsopticalpropertiesandcellimaging AT ailingyang onepotsynthesisofbrightblueluminescentndopedgqdsopticalpropertiesandcellimaging AT xiaoxuwang onepotsynthesisofbrightblueluminescentndopedgqdsopticalpropertiesandcellimaging AT jiexu onepotsynthesisofbrightblueluminescentndopedgqdsopticalpropertiesandcellimaging
_version_	1718411074504491008

One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging

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