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Pressure‐Induced Amorphization and Crystallization of Heterophase Pd Nanostructures

Journal Article · · Small
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [3];  [3];  [4];  [6];  [1]
  1. Department of Chemistry Academy for Advanced Interdisciplinary Studies Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China
  2. Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
  3. State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China
  4. Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China
  5. Partnership for Extreme Crystallography University of Hawaii at Manoa Honolulu Hawaii 96822 USA
  6. Department of Chemistry City University of Hong Kong Hong Kong China, Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) City University of Hong Kong Hong Kong China, Shenzhen Research Institute City University of Hong Kong Shenzhen 518057 China
Abstract

Control of structural ordering in noble metals is very important for the exploration of their properties and applications, and thus it is highly desired to have an in‐depth understanding of their structural transitions. Herein, through high‐pressure treatment, the mutual transformations between crystalline and amorphous phases are achieved in Pd nanosheets (NSs) and nanoparticles (NPs). The amorphous domains in the amorphous/crystalline Pd NSs exhibit pressure‐induced crystallization (PIC) phenomenon, which is considered as the preferred structural response of amorphous Pd under high pressure. On the contrary, in the spherical crystalline@amorphous core‐shell Pd NPs, pressure‐induced amorphization (PIA) is observed in the crystalline core, in which the amorphous‐crystalline phase boundary acts as the initiation site for the collapse of crystalline structure. The distinct PIC and PIA phenomena in two different heterophase Pd nanostructures might originate from the different characteristics of Pd NSs and NPs, including morphology, amorphous‐crystalline interface, and lattice parameter. This work not only provides insights into the phase transition mechanisms of amorphous/crystalline heterophase noble metal nanostructures, but also offers an alternative route for engineering noble metals with different phases.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466
OSTI ID:
1859667
Alternate ID(s):
OSTI ID: 1866479
Journal Information:
Small, Journal Name: Small Journal Issue: 17 Vol. 18; ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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