Photocycle of Excitons in Nitrogen-Rich Carbon Nanodots: Implications for Photocatalysis and Photovoltaics

Gazzetto, Michela; Sciortino, Alice; Nazari, Maryam; Rohwer, Egmont; Giammona, Gaetano; Mauro, Nicolò; Feurer, Thomas; Messina, Fabrizio; Cannizzo, Andrea (2020). Photocycle of Excitons in Nitrogen-Rich Carbon Nanodots: Implications for Photocatalysis and Photovoltaics. ACS applied nano materials, 3(7), pp. 6925-6934. ACS Publications 10.1021/acsanm.0c01259

[img] Text
20_ACS-ANM_SI_CD_272nm_400nm_photocycle.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (7MB) | Request a copy

Nitrogen-rich carbon nanodots have emerged as promising nanomaterials for a wide range of applications where a highly emissive and photoactive material with low toxicity and cost-effectiveness is required. One of their hallmarks is indeed a bright, tunable fluorescence of excitonic nature. Disentangling the origin of their optical absorption and fluorescence properties and uncovering relaxation channels and interactions with solvents are some of the most debated issues in the field. Uncovering these aspects is essential for targeted applications, especially in the fields of photocatalysis but also photovoltaics and optoelectronics. Here, we present dedicated transient absorption measurements of purified monodispersed nanodots covering all relevant electronic transitions. Monodispersed nanodots of about 6 nm size exhibit well-separated absorption and emission features and allow us to unambiguously establish the complete and size-independent femtosecond-to-nanosecond photocycle of nitrogen-rich carbon nanodots. Further rigorous analysis shows that the often complex absorption and emission spectra of an ensemble of nanodots with a broad size distribution result from the superposition of individual size-selective contributions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics > NCCR MUST
08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Lasers

UniBE Contributor:

Gazzetto, Michela; Sciortino, Alice; Nazari Haghighi Pashaki, Maryam; Rohwer, Egmont Johann; Feurer, Thomas and Cannizzo, Andrea

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

2574-0970

Publisher:

ACS Publications

Language:

English

Submitter:

Andrea Cannizzo

Date Deposited:

03 Mar 2021 17:40

Last Modified:

03 Mar 2021 20:58

Publisher DOI:

10.1021/acsanm.0c01259

BORIS DOI:

10.48350/152850

URI:

https://boris.unibe.ch/id/eprint/152850

Actions (login required)

Edit item Edit item
Provide Feedback