Amorphous Carbon Generation as a Photocatalytic Reaction on DNA-Assembled Gold and Silver Nanostructures
- Background signals from in situ-formed amorphous carbon, despite not being fully understood, are known to be a common issue in few-molecule surface-enhanced Raman scattering (SERS). Here, discrete gold and silver nanoparticle aggregates assembled by DNA origami were used to study the conditions for the formation of amorphous carbon during SERS measurements. Gold and silver dimers were exposed to laser light of varied power densities and wavelengths. Amorphous carbon prevalently formed on silver aggregates and at high power densities. Time-resolved measurements enabled us to follow the formation of amorphous carbon. Silver nanolenses consisting of three differently-sized silver nanoparticles were used to follow the generation of amorphous carbon at the single-nanostructure level. This allowed observation of the many sharp peaks that constitute the broad amorphous carbon signal found in ensemble measurements. In conclusion, we highlight strategies to prevent amorphous carbon formation, especially for DNA-assembled SERS substrates.
Author details: | Christian HeckORCiDGND, Yuya KanehiraGND, Janina KneippORCiD, Ilko BaldORCiDGND |
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URN: | urn:nbn:de:kobv:517-opus4-430812 |
DOI: | https://doi.org/10.25932/publishup-43081 |
ISSN: | 1866-8372 |
Title of parent work (German): | Mathematisch-Naturwissenschaftliche Reihe |
Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (732) |
Publication type: | Postprint |
Language: | English |
Date of first publication: | 2019/07/03 |
Publication year: | 2019 |
Publishing institution: | Universität Potsdam |
Release date: | 2019/07/03 |
Tag: | DNA origami; SERS; amorphous carbon; nanolenses; nanoparticle dimers |
Issue: | 732 |
Number of pages: | 10 |
Source: | molecules 24 (2019) 12, Art. 2324 DOI: 10.3390/molecules24122324 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer review: | Referiert |
Publishing method: | Open Access |
License (German): | CC-BY - Namensnennung 4.0 International |
External remark: | Bibliographieeintrag der Originalveröffentlichung/Quelle |