Exploring the Role of Surface States in Emissive Carbon Nanodots: Analysis at Single-Particle Level

Autor:	Won-Joon Son, Christopher I. Richards, Dong Seok Kim, Minsu Gu, Rosemary L. Calabro, Seung-Yeon Kwak, Nadeesha Lakmali Kothalawala, Byeong Su Kim, Doo Young Kim, Kyu Young Hwang, Hyeonho Choi, Abdullah Al Masud
Rok vydání:	2021
Předmět:	Brightness education.field_of_study Range (particle radiation) Photoluminescence Chemistry Organic Chemistry Population General Chemistry Biochemistry Fluorescence Chemical state Chemical physics Particle education Surface states
Zdroj:	Chemistry, an Asian journal. 16(24)
ISSN:	1861-471X
Popis:	Fluorescent carbon nanodots (CDs) have been highlighted as promising semiconducting materials due to their outstanding chemical and optical properties. However, the intrinsic heterogeneity of CDs has impeded a clear understanding of the mechanisms behind their photophysical properties. In this study, as-prepared CDs are fractionated via chromatography to reduce their structural and chemical heterogeneity and analyzed through ensemble and single-particle spectroscopies. Many single particles reveal fluorescence intensity fluctuations between two or more discrete levels with bi-exponential decays. While the intrinsic τ1 components are uniform among single particles, the τ2 components from molecule-like emissions spans a wider range of lifetimes, reflecting the inhomogeneity of the surface states. Furthermore, it is concluded that the relative population and chemical states of surface functional groups in CDs have a significant impact on emissive states, brightness, blinking, stability, and lifetime distribution of photoluminescence.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df949ca704c70c930448caacaa5ba57d https://pubmed.ncbi.nlm.nih.gov/34734682 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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