ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2021
Direct Characterization of Thermal Nonequilibrium between Optical and Acoustic Phonons in Graphene Paper under Photon Excitation.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Stochastic analysis and Monte Carlo simulation of magneto-opto-acoustic wave propagation in nonlocal semiconductor excitation.Scientific reports · 2025Article
- Direct Observation of Suppressed Optical-Acoustic Phonon Energy Coupling in Supported SWCNT at Cryogenic Temperatures.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Direct Observation of Substantial Phonon Nonequilibrium Near Nanoscale Hotspots in Gallium Nitride.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Into the Void: Single Nanopore in Colloidally Synthesized BiChemistry of materials : a publication of the American Chemical Society · 2024Article
- Defect scattering can lead to enhanced phonon transport at nanoscale.Nature communications · 2024Article
- Review of Photothermal Technique for Thermal Measurement of Micro-/Nanomaterials.Nanomaterials (Basel, Switzerland) · 2022Review
- Review on Techniques for Thermal Characterization of Graphene and Related 2D Materials.Nanomaterials (Basel, Switzerland) · 2021Review
- Direct Characterization of Thermal Nonequilibrium between Optical and Acoustic Phonons in Graphene Paper under Photon Excitation.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2021Article
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Raman spectroscopy has been widely used to measure thermophysical properties of 2D materials. The local intense photon heating induces strong thermal nonequilibrium between optical and acoustic phonons. Both first principle calculations and recent indirect Raman measurements prove this phenomenon. To date, no direct measurement of the thermal nonequilibrium between optical and acoustic phonons has been reported. Here, this physical phenomenon is directly characterized for the first time through a novel approach combining both electrothermal and optothermal techniques. While the optical phonon temperature is determined from Raman wavenumber, the acoustic phonon temperature is precisely determined using high-precision thermal conductivity and laser power absorption that are measured with negligible nonequilibrium among energy carriers. For graphene paper, the energy coupling factor between in-plane optical and overall acoustic phonons is found at (1.59-3.10) × 10
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