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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Related Experiment Video

Updated: May 2, 2026

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

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Electronic Control of Emission Behavior in Atomically Precise Copper Nanoclusters.

Maho Kamiyama1, Linlin Zeng2, Milan Kumar Jena3,4

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.

JACS Au
|May 1, 2026
PubMed
Summary

Ligand positioning in copper nanoclusters (Cu NCs) precisely controls their light emission. This study shows how modifying ligand electronic effects tunes photoluminescence for advanced materials.

Keywords:
copperemissionligandsnanoclusterphotoluminescence

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Chemistry

Background:

  • Atomically precise copper nanoclusters (Cu NCs) are crucial for understanding quantum confinement effects.
  • Isolating ligand electronic effects without altering Cu NC core structure is challenging.

Purpose of the Study:

  • To investigate how varying ligand substitution position and electronic nature affects Cu NC photoluminescence.
  • To establish a strategy for controlling emission properties in Cu NCs.

Main Methods:

  • Synthesized four compositionally identical Cu11 NCs with varied thiolate ligands (methyl- and amino-substituted benzenethiols in para and meta configurations).
  • Utilized steady-state and time-resolved spectroscopy, transient absorption, and theoretical calculations.
  • Analyzed ligand-to-metal electronic communication and its impact on excited-state dynamics.

Main Results:

  • Identical Cu11 NCs with different ligand substitutions showed distinct photoluminescence behaviors.
  • Ligand substitution modulated excited-state relaxation, triplet-like excited-state stabilization, and oxygen sensitivity.
  • Cu11-3ABT achieved a 26.1% photoluminescence quantum yield due to enhanced excited-state stabilization.

Conclusions:

  • Ligand positional engineering is a powerful strategy to control emission dynamics in atomically precise Cu NCs.
  • This approach provides fundamental insights into Cu NC excited-state physics.
  • Offers design principles for highly emissive, earth-abundant metal NCs.