Scientists enhance local surface plasmon resonance through super-large monkeys of oxide particles
Characterization of oxygen vacancy properties produced by Cu2O1-X superlattice structures and corresponding disordered structures. Credit: Yao Chang
The research group, led by Professor Yang Liangbao of the Institute of Physical Sciences at the Chinese Academy of Sciences, has strengthened local surface plasmon resonance (LSPR) by studying cu₂o₁₋ₓ superlattices with oxygen vacancies, and has been able to enhance local surface plasmon resonance (LSPR) and It was enhanced by providing new insights into semiconductor vacant doping. LSPR induction in metal oxide nanoparticles. The findings are published in Nano Letters.
LSPR refers to the collective vibration of free electrons in metal nanoparticles, resulting in a resonance phenomenon that absorbs and scatters light at a specific wavelength. This unique optical property makes LSPR applicable to a wide range of fields such as biosensing that increase detection sensitivity, as well as photocatalysts that promote light-driven chemical reactions. Additionally, LSPR-based materials are promising for color adjustment and energy harvesting applications.
Researchers have long focused on research into LSPR enhancement. Building on this foundation, they conducted their research by investigating the possibility of Cu₂O₁₋ₓ superlattices to enhance LSPR effects.
Through a series of carefully designed experiments, they successfully synthesized a Cu₂O₁₋ₓ superlattice structure rich in oxygen vacancies and observed a significant enhancement of LSPR.
They showed that these oxygen vacancies play an important role in increasing carrier concentration and altering the electronic band structure of the material.
Schematic diagram of the changes in the properties of Cu2O NPs after formation of Cu2O1-X superlattice structures and mechanisms of LSPR generation. Credit: Yao Chang
Specifically, oxygen vacancies narrowed the band gap, while bringing the valence band edge closer to Fermi levels. This structural change induced the introduction transitions to generate a strong LSPR mode and significantly enhance the electromagnetic field.
As a result, this material exhibited excellent performance for surface-reinforced Raman spectroscopy.
This study provides a new perspective on vacant doping of semiconductors and opens up new means for inducing LSPR into metal oxide nanoparticles.
Details: Chang Yao et al, Cu2O1-X-Superlattices induced oxygen vacancies due to local surface plasmon resonance, nano-letter (2025). doi: 10.1021/acs.nanolett.4c06330
Provided by the Chinese Science Academy
Citation: Scientists have localized surfaces via superlattices of oxide particles (2025, February 6) recovered from https://phys.org/news/2025-02 on February 6, 2025 Enhances the plasmon resonance of
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