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Thermal conductance between water and nm-thick WS2: extremely localized probing using nanosecond energy transport
Hamidreza Zobeiri1, Nicholas Hunter1, Ridong Wang2
1Department of Mechanical Engineering, Iowa State University Ames Iowa 50011 USA shxu16@sues.edu.cn xwang3@iastate.edu +1-515-294-8023.
Nanoscale Advances
|September 22, 2022
Summary
Researchers developed nanosecond energy transport state-resolved Raman spectroscopy (nET-Raman) to measure liquid-solid interface thermal conductance. This new method accurately quantifies heat transfer across water-WS2 interfaces, overcoming previous experimental challenges.
Area of Science:
- Materials Science
- Thermal Physics
- Nanotechnology
Background:
- Liquid-solid interface energy transport is crucial but experimentally challenging.
- Previous research relied heavily on theoretical studies due to measurement difficulties.
- Accurate characterization of thermal conductance at these interfaces is essential for various applications.
Purpose of the Study:
- To experimentally determine the thermal conductance across a water-WS2 (tungsten disulfide) liquid-solid interface.
- To introduce and validate a novel technique, nanosecond energy transport state-resolved Raman spectroscopy (nET-Raman), for interface thermal transport measurements.
- To investigate the influence of WS2 film thickness on thermal conductance.
Main Methods:
- Utilized nanosecond energy transport state-resolved Raman spectroscopy (nET-Raman) to probe thermal transport.
- Employed WS2 (tungsten disulfide) films of varying thicknesses (22, 33, and 88 nm) in contact with water.
- Irradiated WS2 samples with a 532 nm laser and monitored temperature evolution via Raman shift of the E2g mode under steady (CW) and transient (pulsed) laser conditions.
Main Results:
- Quantified the thermal conductance across the water-WS2 interface to be between 2.5-11.8 MW m^-2 K^-1 for the tested samples.
- Demonstrated strong agreement between experimental results and molecular dynamics simulations.
- Confirmed the robustness and reliability of the nET-Raman technique for interface thermal conductance characterization.
Conclusions:
- The nET-Raman technique provides a robust and accurate method for measuring liquid-solid interface thermal conductance.
- The developed method eliminates the need for laser power absorption and Raman temperature coefficients, simplifying measurements.
- Results contribute to a better understanding of heat transfer at liquid-solid interfaces, with implications for nanomaterials and thermal management.
