Thermal conductivity measurements via time-domain thermoreflectance for the characterization of radiation induced damage

Cheaito, Ramez; Gorham, Caroline S.; Misra, Amit; Hattar, Khalid Mikhiel; Hopkins, Patrick E.

doi:10.1557/jmr.2015.11

Cited by 53 publications

(31 citation statements)

References 62 publications

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“…Our specific setup is described in Ref. 34 . We measure the ratio of the inphase to out-of-phase voltage of the probe response as a function of pump-probe delay time using pump and probe 1/e 2 spot sizes (diameters) of 55 and 13 µm, respectively, while the pump pulses are modulated with a f = 12.2 MHz sinusoidally varying envelope.…”

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confidence: 99%

Size effects on the thermal conductivity of amorphous silicon thin films

et al. 2016

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We investigate thickness-limited size effects on the thermal conductivity of amorphous silicon thin films ranging from 3 -1636 nm grown via sputter deposition. While exhibiting a constant value up to ∼100 nm, the thermal conductivity increases with film thickness thereafter. This trend is in stark contrast with previous thermal conductivity measurements of amorphous systems, which have shown thickness-independent thermal conductivities. The thickness dependence we demonstrate is ascribed to boundary scattering of long wavelength vibrations and an interplay between the energy transfer associated with propagating modes (propagons) and nonpropagating modes (diffusons). A crossover from propagon to diffuson modes is deduced to occur at a frequency of ∼1.8 THz via simple analytical arguments. These results provide empirical evidence of size effects on the thermal conductivity of amorphous silicon and systematic experimental insight into the nature of vibrational thermal transport in amorphous solids.

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confidence: 99%

Size effects on the thermal conductivity of amorphous silicon thin films

et al. 2016

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“…The appearance of He bubbles strengthens embrittlement and swelling, which can even bring about complete failure of materials, especially structural materials and closer plasma‐facing materials . Meanwhile, if heat cannot be removed promptly from the core during nuclear reaction, the fuel cladding will lead to disastrous and irreparable consequences . For example, on March 11, 2011, the reactor decay heat failed to be transported (Loss‐of‐Coolant Accident) in time during a tsunami, which was directly responsible for the catastrophic Fukushima Nuclear Accident .…”

Section: Thermal Resistance Induced By Graphene Layersmentioning

confidence: 99%

Significant Radiation Tolerance and Moderate Reduction in Thermal Transport of a Tungsten Nanofilm by Inserting Monolayer Graphene

Zhao

et al. 2016

Advanced Materials

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Tungsten-graphene multilayer composites are fabricated using a stacking method. The thermal resistance induced by the graphene interlayer is moderate. An ion-implantation method is used to verify the radiation tolerance. The results show that graphene inserted among tungsten films plays a dominant role in reducing radiation damage. Furthermore, the performance of different tungsten period-thicknesses in radiation tolerance is systematically analyzed.

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“…20 The ability to perform thermal transport measurement on ion irradiated samples opens up cost attractive possibilities for fundamental studies on the impact of radiation on thermal properties. [21][22][23][24] …”

Section: Measurement Of Thermal Transport a Standard Approaches mentioning

confidence: 99%

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

et al. 2016

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Thermal transport in materials used for energy applications is a physical process directly tied to performance and reliability. As a result, a great deal of effort has been devoted to understanding thermal transport in materials whose ability to conduct heat is critical. Here, our objective is to discuss the utility of laser-based thermoreflectance (TR) approaches that provide microscale measurement of thermal transport. We provide several examples that implement the TR technique to investigate thermal transport in materials used in nuclear energy applications. First, we discuss utility of this technique to measure thermal conductivity in ion irradiated ceramic materials during investigations where the primary objective is to understand the impact of radiation induced crystalline structure defects on thermal transport. We also present the capability of TR approach to resolve thermal conductivity of each layer in tristructural isotropic fuel, silicon carbide fiber composites, and 2nd phase precipitates in uranium silicide. Finally, the ability to measure interface thermal resistance between adjacent layers in composites is demonstrated.

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Thermal conductivity measurements via time-domain thermoreflectance for the characterization of radiation induced damage

Cited by 53 publications

References 62 publications

Size effects on the thermal conductivity of amorphous silicon thin films

Size effects on the thermal conductivity of amorphous silicon thin films

Significant Radiation Tolerance and Moderate Reduction in Thermal Transport of a Tungsten Nanofilm by Inserting Monolayer Graphene

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

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