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An atomically precise silver nanocluster for artificial light-harvesting system through supramolecular

Anish Kumar Das1, Sourav Biswas1, Surya Sekhar Manna2

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Atom-precise silver nanoclusters (Ag NCs) were used to create an efficient artificial light-harvesting system (LHS). This system achieved 93% energy transfer efficiency and successfully generated photocurrent, paving the way for new energy harvesting technologies.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Photochemistry

Background:

  • Designing artificial light-harvesting systems (LHS) with high energy transfer efficiency is challenging.
  • Atom-precise silver nanoclusters (Ag NCs) offer a unique platform for developing novel LHS.
  • Previous attempts faced limitations due to smaller NC cores and steric environments.

Purpose of the Study:

  • To fabricate an artificial LHS using an atom-precise silver nanocluster (Ag NC).
  • To investigate the energy transfer efficiency and photocurrent generation capabilities of the designed system.
  • To explore the role of supramolecular adducts in controlling emission properties.

Main Methods:

  • One-pot synthesis of a specific Ag NC ([Cl@Ag16S(S-Adm)8(CF3COO)5(DMF)3(H2O)2]·DMF, denoted as Ag16) using a bulky ligand.
  • Formation of supramolecular adducts between Ag16 NCs and β-cyclodextrin (β-CD) to tune emission.
  • Fabrication of the LHS via Förster resonance energy transfer (FRET) using β-carotene as an acceptor.
  • Evaluation of energy transfer efficiency and photocurrent generation.

Main Results:

  • A novel Ag16 NC was synthesized, overcoming steric limitations.
  • Ag16 NCs functionalized with β-CD exhibited controlled blue emission with higher quantum yield and lifetime for Ag16 ∩ β-CD2.
  • An LHS comprising Ag16 and β-carotene achieved 93% energy transfer efficiency via FRET.
  • The fabricated LHS demonstrated efficient photocurrent generation with enhanced yields.

Conclusions:

  • Atom-precise Ag NCs are effective building blocks for artificial LHS.
  • Supramolecular functionalization of NCs allows for tuning of optical properties and energy transfer.
  • The developed Ag NC-based LHS exhibits high efficiency for energy harvesting and conversion.
  • This study provides a foundation for designing advanced light-harvesting systems.