Synthesis of Mg₂Si nanorod arrays by the heat treatment of Si nanorod arrays under Mg vapor

Abstract

Periodic Mg2Si nanorod arrays were synthesized by the heat treatment of Si nanorod arrays with porous structure under Mg vapor. The structural properties of the Si and Mg2Si nanorods were investigated. The morphology of the Si nanorod arrays is preserved in the Mg2Si nanorod arrays. The diameter and height of the Mg2Si nanorods were significantly increased to 420 nm and 600 nm compared to those of the Si nanorods. The volumetric expansion from Si nanorods to Mg2Si nanorods is about V Mg 2Si/VSi = 1.55 and the density of Si nanorods with porous structure is about 48.3%. Periodic Mg2Si nanorod arrays will be useful to control thermal and/or solar radiation. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Monolithic porous magnesium silicide

“…So far, there have been only few reports on tailoring of the morphology of Mg 2 Si by nanostructuring or the introduction of porosity, although nanoscopic and porous structures promise improved performances or even completely new properties, such as drastically reduced thermal conductivities. [13][14][15][16][17][18] Typical synthesis procedures for forming nanostructured Mg 2 Si are spark plasma sintering of nanopowders, 19,20 solid-state phase transformation for nanowires, 21 heat treatment of Si nanorods 22 or reactive diffusion in a vacuum for thin films. 23 In the present work, we address the challenges of a deliberate tailoring of the porous morphology of phase pure magnesium silicide free-standing monoliths.…”

Synthesis of flowerlike Si nanostructures on Si substrates

“…[46][47][48][49][50] The applications of the nanostructures to the antireflection films are also considered. [51][52][53] Moreover, the nano-and microdomains could reduce the thermal conductivity in order to improve the efficiency of thermoelectric generators. [54][55][56] It is expected that the flowerlike Si structures will open various possibilities in future electronics.…”