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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Published on: May 27, 2020

Adsorption based on excitation.

Shi-Chao Qi1, Yan-Yan Han1, Yong-Lan Liu1

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, China.

Nature Communications
|June 2, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals an excitation-driven adsorption mode using metallophthalocyanine/carbonaceous composites. Ultraviolet light enables selective carbon monoxide (CO) adsorption, demonstrating a novel photoexcitation strategy for energy-efficient separations.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Surface Chemistry

Background:

  • Adsorption processes are traditionally understood to occur in the ground electronic state.
  • Metallophthalocyanines (MPcs) and carbonaceous substrates are key materials in catalysis and adsorption.

Purpose of the Study:

  • To investigate an excitation-driven adsorption mechanism.
  • To develop novel photoresponsive materials for selective gas adsorption.
  • To explore energy-efficient chemical separation technologies.

Main Methods:

  • Synthesis of metallophthalocyanine/carbonaceous composites, focusing on potassium-phthalocyanine (KPc)/reduced graphene oxide (RG).
  • Femtosecond transient absorption spectroscopy to probe excited-state dynamics.
  • First-principles simulations to elucidate adsorption mechanisms.

Main Results:

  • The KPc/RG composite exhibits significant CO adsorption under UV irradiation (1.20 mmol g⁻¹).
  • UV light induces efficient electron transfer from KPc to RG, creating long-lived holes on KPc for selective CO adsorption.
  • Negligible CO adsorption (0.06 mmol g⁻¹) is observed in the dark, yielding a UV-modulated adsorption capacity ratio of up to 95%.

Conclusions:

  • An excitation-driven adsorption mode, distinct from traditional ground-state adsorption, has been demonstrated.
  • This mechanism is applicable to various metallophthalocyanine/carbonaceous composites.
  • The findings offer a promising strategy for utilizing photoexcitation in energy-efficient chemical separations.