Probing heteroatoms co-doped graphene quantum dots for energy transfer and 2-photon assisted applications

Autor:	Vijay Kumar Sagar, Yogambha Ramaswamy, Hala Zreiqat, Gurvinder Singh, Soumyodeep Dey, Shubhayan Bhattacharya, Prem B. Bisht, Pooria Lesani
Rok vydání:	2022
Předmět:	Photon Photoluminescence Chemistry business.industry Graphene General Chemical Engineering Heteroatom General Physics and Astronomy Quantum yield General Chemistry law.invention chemistry.chemical_compound Quantum dot law Rhodamine B Optoelectronics Absorption (electromagnetic radiation) business
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 423:113618
ISSN:	1010-6030
Popis:	Carbon based quantum dots find various applications such as imaging, diagnosis and therapeutics due to low toxicity, antibacterial activity, excellent water solubility, and good biocompatibility. However, the UV-blue emission of carbon based quantum dots is unsuited for applications in biomedicine and imaging as the short wavelength lights harm the living cells due to phototoxicity. In the present work, we have synthesised the long wavelength emitting heteroatoms (nitrogen (N) and sulfur (S)) co-doped graphene quantum dots (NS-GQD) via hydrothermal route. These NS-GQD have excitation-wavelength independent photoluminescence with high quantum yield in protonated and neutral forms. The non-covalent interaction of these NS-GQD when studied with a dye rhodamine B (RB) shows evidence of Forster resonance energy transfer (FRET). It has been shown here that the NS-GQD-RB composite exhibits prominent two-photon absorption at near infrared wavelength with a capability of deep-tissue imaging upto 175 µm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7c6e7b410c734792cab61eb2ecaaf044 https://doi.org/10.1016/j.jphotochem.2021.113618 Zobrazit plný text záznamu Full Text from ScienceDirect