Quantifying photothermal heating at plasmonic nanoparticles by scanning electrochemical microscopy
Yun Yu1, Jeffrey D Williams, Katherine A Willets
1Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA. kwillets@temple.edu.
Faraday Discussions
|July 27, 2018
Summary
This study introduces a scanning electrochemical microscopy (SECM) method to measure surface temperature increases at nanostructures. This technique quantifies photothermal heating effects, crucial for understanding nanoparticle-enhanced electrochemical processes.
Area of Science:
- Nanotechnology
- Electrochemistry
- Physical Chemistry
Background:
- Photothermal heating in metal nanoparticles arises from localized surface plasmon decay.
- This heating influences mass transport and redox potentials at nanoparticle interfaces.
- Understanding these thermal effects is key for electrochemical applications.
Purpose of the Study:
- To develop a method for probing surface temperature at plasmonic nanoparticle substrates.
- To quantify temperature increases using scanning electrochemical microscopy (SECM).
- To validate the SECM approach through simulations.
Main Methods:
- Utilizing SECM with an ultramicroelectrode tip near a light-excited plasmonic substrate.
- Measuring redox molecule mass transfer rates and concentration profiles.
- Correlating mass transfer and potential shifts to surface temperature.
Main Results:
- Demonstrated SECM's capability to quantitatively measure surface temperature increases.
- Verified experimental temperature measurements with heat dissipation simulations.
- Showcased the method's applicability to various nanostructures.
Conclusions:
- The developed SECM methodology accurately probes photothermal heating at nanostructures.
- This technique provides quantitative surface temperature data for plasmonic and non-plasmonic materials.
- The approach is valuable for studying nanoparticle-electrode interfacial phenomena.
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