Thermal transport in composites of self-assembled nickel nanoparticles embedded in yttria stabilized zirconia

Abstract

We investigate the effect of nickel nanoparticle size on thermal transport in multilayer nanocomposites consisting of alternating layers of nickel nanoparticles and yttria stabilized zirconia (YSZ) spacer layers that are grown with pulsed laser deposition. Using time-domain thermoreflectance, we measure thermal conductivities of k=1.8, 2.4, 2.3, and 3.0 W m−1 K−1 for nanocomposites with nickel nanoparticle diameters of 7, 21, 24, and 38 nm, respectively, and k=2.5 W m−1 K−1 for a single 80 nm thick layer of YSZ. We use an effective medium theory to estimate the lower limits for interface thermal conductance G between the nickel nanoparticles and the YSZ matrix (G>170 MW m−2 K−1), and nickel nanoparticle thermal conductivity.

Phononic thermal resistance due to a finite periodic array of nano-scatterers

“…We observe that the two commonly applied models, the acoustic mismatch model (AMM) and diffuse mismatch model (DMM), do not necessarily lead to values that are comparable to the available experimental data [1,15,17,18]. In all cases, it is clear that the shapes of embedded elements and/or interfaces have an important impact on the TBR [5], [6], [10] [19], [20].…”

“…Adding carbon nanotubes to the metal/metal interface [3,4], or including self-assembled nanoparticles embedded in the material [5] [6] are some experimental examples that can be used to tune the TBR, as well as chemical etching [7][8][9]. Other strategies have been highlighted, such as the addition of a new material to the solid/solid coupling or modulating the roughness [10].…”

Thermal conductivity of yttria‐stabilized zirconia thin films grown by plasma‐enhanced atomic layer deposition

“…In this sensitivity calculation, the thermal conductivity of the YSZ film ( k YSZ ) is assumed to be 1.41 W m −1 K −1 , taken from a previous TDTR study for 8.4 mol% ALD YSZ thin films 10 . The TBCs at the Al/YSZ and YSZ/Si interfaces ($${G_{{\rm{Al}}/{\rm{YSZ}}}}$$ and $${G_{{\rm{YSZ}}/{\rm{Si}}}}$$, respectively) are assumed to be both 100 MW m −2 K −1 , both of which are within the range of values reported in the literature 10,23,54,55 …”

Time-Domain Thermoreflectance Measurements for Thermal Property Characterization of Nanostructures

“…Persson et al 11 examined the thermal conductance of InAs nanowire composites with TDTR and a finite element method analysis of the complex composite structure. Shukla et al 26 used TDTR to examine nanostructured composites of nickel nanoparticles embedded in a yttrium stabilized zirconia matrix and extracted interface thermal conductance for the buried nanoparticles. The same group also measured interface thermal conductance for amorphous and crystalline metallic alloys and buried interfaces by varying measurement frequency.…”