Journal article
Si boride-coated Si nanoparticles with improved thermal oxidation resistance
Nano energy, v 9(C), pp 32-40
01 Oct 2014
Abstract
A new fabrication technique is devised to synthesize conformal Si core-shell nanoparticles (NPs) with Si boride nanoshell by reacting the surface atoms of Si NPs (50-200 nm diameter) with a molten salt of sodium borohydride. The shell layer, about 10-20 nm thick, consists of a mixture of crystalline phase (SiBx) and other amorphous phases as identified by TEM and EELS analysis. New absorbance peaks for Si-Si boride core-shell NPs appear at the wavenumber of 940 and 777-677 cm(-1) in FT-IR analysis. TGA analysis reveals that the core-shell structured Si-Si boride NPs exhibit a remarkably improved resistance to thermal oxidation by a factor of 4.6 at 750 degrees C and at by a factor of 3.5 at 850 degrees C compared to bare Si. Optical measurements show that spectrally selective coating (SSC) layers made of Si-Si boride NPs have a superior optical stability to that of the bare Si NPs after annealing at high temperature, and desirably exhibit a lower reflectance in the visible spectrum range than the bare Si NPs. These surface-protected, oxidation-resistant semiconductor materials and their novel fabrication methods exhibit further broad applicability of boride nanolayers which can be used for high temperature applications such as solar thermal power generation. (C) 2014 Elsevier Ltd. All rights reserved.
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Details
- Title
- Si boride-coated Si nanoparticles with improved thermal oxidation resistance
- Creators
- Tae Kyoung Kim - University of California San DiegoJaeyun Moon - University of California San DiegoBryan VanSaders - University of California San DiegoDongwon Chun - Univ Calif San Diego, La Jolla, CA 92093 USACalvin J. Gardner - University of California San DiegoJae-Young Jung - Univ Calif San Diego, La Jolla, CA 92093 USAGang Wang - University of California San DiegoRenkun Chen - University of California San DiegoZhaowei Liu - University of California San DiegoYu Qiao - University of California San DiegoSungho Jin - Univ Calif San Diego, La Jolla, CA 92093 USA
- Publication Details
- Nano energy, v 9(C), pp 32-40
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- DE-EE0005802 / U.S. Department of Energy through DOE Sun Shot Project; United States Department of Energy (DOE) 12-PC-246854 / University of California; University of California System
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000344632800004
- Scopus ID
- 2-s2.0-84904427751
- Other Identifier
- 991021877482304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied