Silver cluster doped graphyne (GY) with outstanding non-linear optical properties

Area of Science:

• Computational Chemistry
• Materials Science
• Nanotechnology

Background:

• Graphyne (GY) and its derivatives are promising materials for advanced applications.
• Understanding the optical and nonlinear optical (NLO) properties of doped materials is crucial for device development.
• Silver (Ag) clusters can modify the electronic and optical characteristics of host materials.

Purpose of the Study:

• To computationally investigate the optical and NLO characteristics of silver cluster-doped graphyne complexes.
• To analyze the effects of different doping strategies and silver cluster arrangements on material properties.
• To evaluate the potential of these doped complexes for nanoscale device applications.

Main Methods:

• Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) computational methods were employed.
• Specific theoretical models including CAM-B3LYP/LANL2DZ and CAM-B3LYP/mixed basis sets were utilized.
• Analysis included frontier molecular orbitals (FMOs), density of states (DOS), absorption spectra, hyperpolarizabilities, and binding energies.

Main Results:

• Doping graphyne with silver clusters significantly narrowed the band gap (2.58-4.73 eV) and enhanced maximum absorption wavelength (368-536 nm) compared to pure graphyne.
• Silver cluster doping also increased linear polarizability and first hyperpolarizability, particularly in GY@3Ag_center and 2GY@3Ag_center complexes.
• Non-covalent interaction (NCI) analysis confirmed interactions between silver clusters and the graphyne surface.

Conclusions:

• Silver cluster doping effectively modifies the electronic and optical properties of graphyne.
• The GY@3Ag_center and 2GY@3Ag_center configurations show significant enhancement in NLO properties.
• These findings suggest that silver-doped graphyne, especially using two-unit cells (2GY), is a promising candidate for future nanoscale devices.