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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Unraveling Element-Selective Local Structures in Multielement Alloy Nanoparticles with EXAFS.

Masashi Nakamura1, Dongshuang Wu1, Megumi Mukoyoshi1

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.

ACS Nanoscience Au
|June 25, 2025
PubMed
Summary

We developed a new EXAFS analysis method for multielement alloy nanoparticles. This technique accurately determines element-specific local structures, revealing insights into material properties.

Keywords:
EXAFSdynamic structureelement-selective structurehigh-entropy alloymultielement alloyp-block metalplatinum-group metal

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Analyzing multielement alloy nanoparticles (MEA NPs) presents challenges due to complex structural parameter fitting.
  • Existing methods struggle to provide element-selective local structure information in complex alloys.

Purpose of the Study:

  • To develop a physically consistent and interpretable extended X-ray absorption fine structure (EXAFS) curve-fitting analysis for MEA NPs.
  • To enable the estimation of element-selective static and dynamic local structures.

Main Methods:

  • Simultaneous fitting of multiple EXAFS datasets at different absorption edges and temperatures.
  • Imposing constraints based on physically reasonable models to manage parameter complexity.
  • Estimating individual element contributions to atomic radii and Einstein temperatures.

Main Results:

  • Successfully analyzed MEA NPs composed of platinum-group and p-block metals.
  • Demonstrated that local structures reflect intrinsic elemental properties and inter-element interactions.
  • Observed distinct local structure modulations in p-block metals due to electronic interactions with platinum-group metals.

Conclusions:

  • The developed EXAFS analysis method provides precise structural characterization of complex nanomaterials.
  • This approach facilitates a deeper understanding of structure-property relationships in MEA NPs.
  • The method bridges the gap between experimental data and theoretical calculations for nanomaterial analysis.