Local Chemical Ordering and Negative Thermal Expansion in PtNi Alloy Nanoparticles
Abstract
An atomic insight into the local chemical ordering and lattice strain is particular interesting to recent emerging bimetallic nanocatalysts such as PtNi alloys. Here in this paper, we reported the atomic distribution, chemical environment and lattice thermal evolution in full-scale structural description of PtNi alloy nanoparticles (NPs). The different segregation of elements in the well-faceted PtNi nanoparticles is convinced by extended X-ray absorption fine structure (EXAFS). Atomic pair distribution function (PDF) study evidences the co-existence of the face-centered cubic and tetragonal ordering parts in the local environment of PtNi nanoparticles. Further reverse monte carlo (RMC) simulation with PDF data obviously exposed the segregation as Ni and Pt in the centers of {111} and {001} facets respectively. Layer-by-layer statistical analysis up to 6 nm for the local atomic pairs revealed the distribution of local tetragonal ordering on the surface. This local coordination environment facilitates the distribution of heteroatomic Pt-Ni pairs, which plays an important role in the negative thermal expansion of Pt41Ni59 NPs. The present study on PtNi alloy NPs from local short-range coordination to long-range average lattice provides a new perspective on tailoring physical properties in nanomaterials.
- Authors:
-
[1];
[1]
- Univ. of Science and Technology Beijing, Beijing (China). Dept. of Physical Chemistry
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing Synchrotron Radiation Facility, Inst. of High Energy Physics
- Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1467893
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 12; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; PtNi alloy nanoparticles; extended X-ray absorption fine structure; atomic pair distribution function; negative thermal expansion; local ordering
Citation Formats
Li, Qiang, Zhu, He, Zheng, Lirong, Fan, Longlong, Wang, Na, Rong, Yangchun, Ren, Yang, Chen, Jun, Deng, Jinxia, and Xing, Xianran. Local Chemical Ordering and Negative Thermal Expansion in PtNi Alloy Nanoparticles. United States: N. p., 2017.
Web. doi:10.1021/acs.nanolett.7b04219.
Li, Qiang, Zhu, He, Zheng, Lirong, Fan, Longlong, Wang, Na, Rong, Yangchun, Ren, Yang, Chen, Jun, Deng, Jinxia, & Xing, Xianran. Local Chemical Ordering and Negative Thermal Expansion in PtNi Alloy Nanoparticles. United States. https://doi.org/10.1021/acs.nanolett.7b04219
Li, Qiang, Zhu, He, Zheng, Lirong, Fan, Longlong, Wang, Na, Rong, Yangchun, Ren, Yang, Chen, Jun, Deng, Jinxia, and Xing, Xianran. Tue .
"Local Chemical Ordering and Negative Thermal Expansion in PtNi Alloy Nanoparticles". United States. https://doi.org/10.1021/acs.nanolett.7b04219. https://www.osti.gov/servlets/purl/1467893.
@article{osti_1467893,
title = {Local Chemical Ordering and Negative Thermal Expansion in PtNi Alloy Nanoparticles},
author = {Li, Qiang and Zhu, He and Zheng, Lirong and Fan, Longlong and Wang, Na and Rong, Yangchun and Ren, Yang and Chen, Jun and Deng, Jinxia and Xing, Xianran},
abstractNote = {An atomic insight into the local chemical ordering and lattice strain is particular interesting to recent emerging bimetallic nanocatalysts such as PtNi alloys. Here in this paper, we reported the atomic distribution, chemical environment and lattice thermal evolution in full-scale structural description of PtNi alloy nanoparticles (NPs). The different segregation of elements in the well-faceted PtNi nanoparticles is convinced by extended X-ray absorption fine structure (EXAFS). Atomic pair distribution function (PDF) study evidences the co-existence of the face-centered cubic and tetragonal ordering parts in the local environment of PtNi nanoparticles. Further reverse monte carlo (RMC) simulation with PDF data obviously exposed the segregation as Ni and Pt in the centers of {111} and {001} facets respectively. Layer-by-layer statistical analysis up to 6 nm for the local atomic pairs revealed the distribution of local tetragonal ordering on the surface. This local coordination environment facilitates the distribution of heteroatomic Pt-Ni pairs, which plays an important role in the negative thermal expansion of Pt41Ni59 NPs. The present study on PtNi alloy NPs from local short-range coordination to long-range average lattice provides a new perspective on tailoring physical properties in nanomaterials.},
doi = {10.1021/acs.nanolett.7b04219},
journal = {Nano Letters},
number = 12,
volume = 17,
place = {United States},
year = {Tue Nov 21 00:00:00 EST 2017},
month = {Tue Nov 21 00:00:00 EST 2017}
}
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Works referencing / citing this record:
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