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Complete miscibility of immiscible elements at the nanometre scale

Journal Article · · Nature Nanotechnology
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [5];  [3]
  1. Fudan Univ., Shanghai (China); Kavli Energy NanoScience Institute, Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  2. University of California, Berkeley, CA (United States)
  3. Kavli Energy NanoScience Institute, Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
  5. Kavli Energy NanoScience Institute, Berkeley, CA (United States); University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Understanding the mixing behaviour of elements in a multielement material is important to control its structure and property. When the size of a multielement material is decreased to the nanoscale, the miscibility of elements in the nanomaterial often changes from its bulk counterpart. However, there is a lack of comprehensive and quantitative experimental insight into this process. Here, in this study, we explored how the miscibility of Au and Rh evolves in nanoparticles of sizes varying from 4 to 1 nm and composition changing from 15% Au to 85% Au. We found that the two immiscible elements exhibit a phase-separation-to-alloy transition in nanoparticles with decreased size and become completely miscible in sub-2 nm particles across the entire compositional range. Quantitative electron microscopy analysis and theoretical calculations were used to show that the observed immiscibility-to-miscibility transition is dictated by particle size, composition and possible surface adsorbates present under the synthesis conditions.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2472914
Journal Information:
Nature Nanotechnology, Journal Name: Nature Nanotechnology Journal Issue: 6 Vol. 19; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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