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Published on: December 8, 2020
A temperature microsensor for measuring laser-induced heating in gold nanorods
Dennis B Pacardo1, Bhanu Neupane, Gufeng Wang
1Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, EB III, Campus Box 7115, Raleigh, NC, 27695, USA.
Abstract:
Measuring temperature is an extensively explored field of analysis, but measuring a temperature change in a nanoparticle is a new challenge. Here, a microsensor is configured to measure temperature changes in gold nanorods in solution upon laser irradiation. The device consists of a silicon wafer coated with silicon nitride in which a microfabricated resistance temperature detector was embedded and attached to a digital multimeter. A polydimethylsiloxane mold served as a microcontainer for the sample attached on top of the silicon membrane. This enables laser irradiation of the gold nanorods and subsequent measurement of temperature changes. The results showed a temperature increase of 8 to 10 °C and good correlation with theoretical calculations and bulk sample direct temperature measurements. These results demonstrate the suitability of this simple temperature microsensor for determining laser-induced heating profiles of metallic nanomaterials; such measurements will be essential for optimizing therapeutic and catalytic applications.
