The nitrogen atoms have been attracting enormous attention in improving the fluorescent properties of carbon quantum dots (CQDs), but the contribution varies widely. In this work, the effects of chemical bonds between nitrogen and its neighbor carbon atoms as well as the nitrogen/carbon molar ratio (N/C) on fluorescence properties of CQDs were investigated. Importantly, the former was disclosed based on two kinds of well-designed nitrogen doped CQDs (N-CQDs-1 and N-CQDs-2) that show differences in chemical bonds of doped nitrogen atoms but contain the same N/C ratio and are common in the content of sp2 hybridized carbon atoms and particle size. We concluded that pyridine N rather than pyrrole N is beneficial to increasing the emission intensity of CQDs, probably caused by the enhancement of electron exchange of complex luminescent centers, and the formation and introduction of electron traps. And the emission intensity does increase with the amount of doped nitrogen atoms. Therefore, the N-CQDs-1 containing the most amount of N atoms as forms of pyridine and pyrrole shows amazing fluorescent properties and highly quantum yield (QY) up to 34.23%.
Journal of Luminescence – Elsevier
Published: May 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera