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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
651
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

164
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
164
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

310
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
310
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

563
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
563
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

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Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
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Updated: Jun 3, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Programmable Electromagnetic Wave Absorption via Tailored Metal Single Atom-Support Interactions.

Mingyue Yuan1, Bangxin Li1, Yiqian Du1

  • 1Laboratory of Advanced Materials, Institute of Optoelectronics, Fudan University, Shanghai, 200438, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers visualized metal single atoms on graphene using electron holography. This revealed controllable electronic properties for programmable electromagnetic wave absorption, advancing microelectronics.

Keywords:
dielectric relaxation polarizationelectromagnetic interferenceprogrammable electronic propertiessingle atom‐support interactions

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Single atom (SA)-support interactions are crucial for catalysis and electronic applications.
  • Modulating electronic properties via atomic-scale interactions remains a significant challenge.

Purpose of the Study:

  • To visualize and understand metal-SA-graphene interactions at the atomic level.
  • To leverage these interactions for controllable electronic properties and electromagnetic wave absorption.

Main Methods:

  • In situ, off-axis electron holography was used to directly observe SA-graphene interactions.
  • Development of a library of SA-graphene materials with controlled interactions.

Main Results:

  • Observed formation of nanoscale regions with high charge density, sensitive to electromagnetic fields.
  • Demonstrated customized dielectric relaxation and programmable electromagnetic wave absorption.
  • Electronic behaviors were found to be temperature-insensitive, distinct from conventional materials.

Conclusions:

  • Precise control of SA-support interactions enables tailored electronic and electromagnetic properties.
  • This approach offers a pathway to customized electromagnetic wave absorption for electronic components.
  • Further manipulation of atomic interactions holds potential for revolutionizing nanoelectronics and optoelectronics.