Journal
NANO LETTERS
Volume 14, Issue 6, Pages 3544-3549Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5011542
Keywords
Plasmon; nanohole; gold; temperature; current; thermal expansion
Categories
Funding
- Swedish Foundation for Strategic Research
- Swedish Research Council
- Knut & Alice Wallenberg Foundation
- EU FP7 Program (Marie Curie Career Integration Grant)
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We have created a simple and efficient thermal plasmonic sensor platform by letting a DC current heat plasmonic nanohole arrays. The sensor can be used to determine thermodynamic parameters in addition to monitoring molecular reactions in real-time. As an application example, we use the thermal sensor to determine the kinetics and activation energy for desorption of thiol monolayers on gold. Further, the temperature of the metal can be measured optically by the spectral shift of the bonding surface plasmon mode (0.015 nm/K). We show that this resonance shift is caused by thermal lattice expansion, which reduces the plasma frequency of the metal. The sensor is also used to determine the thin film thermal expansion coefficient through a theoretical model for the expected resonance shift.
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