Impact of Porosity and Boundary Scattering on Thermal Transport in Diameter-Modulated Nanowires
Impact of Porosity and Boundary Scattering on Thermal Transport in Diameter-Modulated Nanowires
复制标题
孔隙率和边界散射对直径调制纳米线热传输的影响
DOI：
10.1021/acsami.1c20242
复制
发表时间：
2022
影响因子：
9.5
通讯作者：
Maldovan, Martin
中科院分区：
文献类型：
--
作者：
Malhotra, Abhinav;Tutuncuoglu, Gozde;Kommandur, Sampath;Creamer, Patrick;Rajan, Aravindh;Mohabir, Amar;Yee, Shannon;Filler, Michael A.;Maldovan, Martin
我们研究了直径调制的硅纳米线的热导率，以了解不同的纳米级传输机制作为纳米线形态的函数的影响。我们的调查夫妇的瞬态悬浮微桥测量的直径调制硅纳米线合成通过气-液-固生长和掺杂剂选择性蚀刻预测玻尔兹曼输运建模。我们表明，低热导率相（即，孔隙率）主导有效热导率的降低，并由增加的声子边界散射补充。这两种机制的相对贡献取决于纳米级形态的细节。我们的研究结果为复杂纳米材料中控制热传导的因素提供了有价值的见解。
We study the thermal conductivity of diameter-modulated Si nanowires to understand the impact of different nanoscale transport mechanisms as a function of nanowire morphology. Our investigation couples transient suspended microbridge measurements of diameter-modulated Si nanowires synthesized via vapor–liquid–solid growth and dopant-selective etching with predictive Boltzmann transport modeling. We show that the presence of a low thermal conductivity phase (i.e., porosity) dominates the reduction in effective thermal conductivity and is supplemented by increased phonon-boundary scattering. The relative contributions of both mechanisms depend on the details of the nanoscale morphology. Our findings provide valuable insights into the factors that govern thermal conduction in complex nanoscale materials.