Using atomic layer deposited tungsten to increase thermal conductivity of a packed bed

作者：Van Norman Staci A; Tringe Joseph W; Sain John D; Yang Ronggui; Falconer John L; Weimer Alan W^*

来源：Applied Physics Letters, 2015, 106(15): 153102.

DOI：10.1063/1.4917309

This study investigated the effective thermal conductivity (k(eff)) of packed-beds that contained porous particles with nanoscale tungsten (W) films of different thicknesses formed by atomic layer deposition (ALD). A continuous film on the particles is vital towards increasing k(eff) of the packed beds. For example, the k(eff) of an alumina packed bed was increased by three times after an similar to 8-nm continuous W film with 20 cycles of W ALD, whereas k(eff) was decreased on a polymer packed bed with discontinuous, evenly dispersed W-islands due to nanoparticle scattering of phonons. For catalysts, understanding the thermal properties of these packed beds is essential for developing thermally conductive supports as alternatives to structured supports.

• 出版日期2015-4-13