Bulk Grain-Boundary Materials from Nanocrystals
- Brown Univ., Providence, RI (United States)
- Institute for Molecular Science, Okazaki, Aichi (Japan)
- Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
- Cornell Univ., Ithaca, NY (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
Grain-boundary engineering is pivotal to fully utilize the mechanical, electrical, and thermal-transport properties of various materials. However, current methods in metallurgy rely almost exclusively on top-down approaches, making precise grain-boundary engineering, especially at nanoscale, difficult to achieve. Herein, we report a method to produce tailored grain-boundary conditions with nanoscale precision from colloidal metal nanocrystals through surface treatment followed by a pressure-sintering process. The resulting bulk grain-boundary materials (which we call “nanocrystal coins”) possess a metal-like appearance and conductivity while inheriting the original domain features of the nanocrystal building blocks. In this work, nanoindentation measurements confirmed the superior mechanical hardness of the obtained materials. Further, we use this method to fabricate, for the first time, a single-component bulk metallic glass from amorphous palladium nanoparticles. Our discovery may spur the development of new materials whose functionality crucially depends on the domain configuration at nanoscale, such as superhard materials, thermoelectric generators, and functional electrodes.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
- Sponsoring Organization:
- Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); Noguchi Institute; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1765591
- Alternate ID(s):
- OSTI ID: 1781231
- Journal Information:
- Chem, Journal Name: Chem Journal Issue: 2 Vol. 7; ISSN 2451-9294
- Publisher:
- Cell Press, ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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