Sub-μm c-axis structural domain size of graphene paper uncovered by low-momentum phonon scattering

Han

Journal of Applied Physics

et al. 2018

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Frequency-resolved Raman spectroscopy (FR-Raman) is a new technique for nondestructive thermal characterization. Here, we apply this new technique to measure the anisotropic thermal conductivity of suspended nm-thick black phosphorus samples without the need of optical absorption and temperature coefficient. Four samples with thicknesses between 99.8 and 157.6 nm are studied. Based on steady state laser heating and Raman measurement of samples with a specifically designed thermal transport path, the thermal conductivity ratio (j ZZ /j AC) is determined to be 1.86-3.06. Based on the FR-Raman measurements, the armchair thermal conductivity is measured as 14-22 W m À1 K À1 , while the zigzag thermal conductivity is 40-63 W m À1 K À1. FR-Raman has great potential for studying the thermal properties of various nanomaterials. This study significantly advances our understanding of thermal transport in black phosphorus and facilitates the application of black phosphorus in novel devices.

Section: Introductionmentioning

confidence: 99%

Characterization of anisotropic thermal conductivity of suspended nm-thick black phosphorus with frequency-resolved Raman spectroscopy

Han

Journal of Applied Physics

et al. 2018

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“…From Equation (13),

can be written as

, where l 0 is the mean free path limited by defect scattering. l 0 is called structure thermal domain size, which is actually an effective domain size combining the effect from three-dimensional crystallite [ 38 , 39 , 40 ].…”

Section: Concluding Remarks and Outlooksmentioning

confidence: 99%

Energy and Charge Transport in 2D Atomic Layer Materials: Raman-Based Characterization

Zobeiri

et al. 2020

Nanomaterials

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As they hold extraordinary mechanical and physical properties, two-dimensional (2D) atomic layer materials, including graphene, transition metal dichalcogenides, and MXenes, have attracted a great deal of attention. The characterization of energy and charge transport in these materials is particularly crucial for their applications. As noncontact methods, Raman-based techniques are widely used in exploring the energy and charge transport in 2D materials. In this review, we explain the principle of Raman-based thermometry in detail. We critically review different Raman-based techniques, which include steady state Raman, time-domain differential Raman, frequency-resolved Raman, and energy transport state-resolved Raman techniques constructed in the frequency domain, space domain, and time domain. Detailed outlooks are provided about Raman-based energy and charge transport in 2D materials and issues that need special attention.

“…12 The thermal reffusivity theory has also been successfully used in investigating the STD size of other materials including ultrahigh molecular weight polyethylene (UHMWPE) fibers, 13 SiC microwires 14 and graphene paper (GP). 15 Liu et al found that the STD size for the two UHMWPE fiber samples is 8.06 and 9.42 nm. They are smaller than the crystallite size determined by XRD [19.7 nm in the (002) direction].…”

Section: Introductionmentioning

confidence: 99%

“…Wang's group first used the thermal reffusivity variation against temperature to determine the residual thermal reffusivity value at the 0 K limit and used this parameter to characterize the STD size of different materials. [9][10][11][12][13][14][15] Xu et al for the first time used the thermal reffusivity theory to determine the phonon thermal resistivity of DNA. 9 Cheng et al found that the STD size of an individual polycrystalline silver nanowire was 38.5 nm, which was larger than the value obtained from the XRD result [21 nm in the (311) direction].…”

Section: Introductionmentioning

confidence: 99%

The in-plane structure domain size of nm-thick MoSe₂ uncovered by low-momentum phonon scattering

et al. 2021

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