The localized surface-plasmon resonance of metal nanoparticles and clusters corresponds to a collective charge oscillation of the quasi-free metal electrons. The polarization of the more localized d electrons opposes the overall polarization of the electron cloud and thus screens the surface plasmon. By contrast, a static electric external field is well screened, as even very small noble-metal clusters are highly metallic: the field inside is practically zero except for the effect of the Friedel-oscillation-like modulations which lead to small values of the polarization of the d electrons. In the present article, we present and compare representations of the induced densities (i) connected to the surface-plasmon resonance and (ii) resulting from an external static electric field. The two cases allow for an intuitive understanding of the differences between the dynamic and the static screening.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/d2cp04316e | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Plasmon Dynamics in Nanoclusters: Dephasing Revealed by Excited States Evaluation.
J Chem Theory Comput
January 2025
Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02453, United States.
The photocatalytic efficiency of materials such as graphene and noble metal nanoclusters depends on their plasmon lifetimes. Plasmon dephasing and decay in these materials is thought to occur on ultrafast time scales, ranging from a few femtoseconds to hundreds of femtoseconds and longer. Here we focus on understanding the dephasing and decay pathways of excited states in small lithium and silver clusters and in plasmonic states of the π-conjugated molecule anthracene, providing insights that are crucial for interpreting optical properties and photophysics.
View Article and Find Full Text PDFMultivariate analysis on the structure-activity parameters for nano CuO-catalyzed reduction reactions.
ACS Appl Nano Mater
January 2024
Department of Chemistry, University of Central Florida, Orlando, Florida 32816 (USA).
Understanding the origin of enhanced catalytic activity is critical to heterogeneous catalyst design. This is especially important for non-noble metal-based catalysts, notably metal oxides, which have recently emerged as viable alternatives for numerous thermal catalytic processes. For thermal catalytic reduction/hydrogenation using metal oxide nanoparticles, enhanced catalytic performance is typically attributed to increased surface area and oxygen vacancies.
View Article and Find Full Text PDFLattice Modulation on Singlet-Triplet Splitting of Silver Cluster Boosting Near-Unity Photoluminescence Quantum Yield.
Angew Chem Int Ed Engl
December 2024
School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, People's Republic of China.
Developing thermally activated delayed fluorescence (TADF)-active silver clusters with near-unity quantum efficiency is of practical importance in cutting-edge optoelectronic devices, but remains a tremendous challenge due to the difficulty of de novo synthesis and uncertainty of properties. Herein, we demonstrate a lattice modulation on parent TADF- active silver cluster, achieving TADF-driven photoluminescence quantum yield (PLQY) from 12 % to near-unity. Systematic experimental and calculated results reveal that the lattice modulation effectively lowers the singlet-triplet splitting (ΔE) from 718 to 549 cm, thereby facilitating thermally activated reverse intersystem crossing: T→S, leading to extremely efficient TADF by surpassing both phosphorescence and non-radiative decay, thus boosting the near-unity PLQY.
View Article and Find Full Text PDFCo Cluster-Modified Ni Nanoparticles with Superior Light-Driven Thermocatalytic CO Reduction by CH.
Molecules
November 2024
School of Pharmacy, Shandong Second Medical University, Weifang 261053, China.
Excessive fossil burning causes energy shortages and contributes to the environmental crisis. Light-driven thermocatalytic CO reduction by methane (CRM) provides an effective strategy to conquer these two global challenges. Ni-based catalysts have been developed as candidates for CRM that are comparable to the noble metal catalysts.
View Article and Find Full Text PDFElucidating Confinement and Microenvironment of Ru Clusters Stably Confined in MFI Zeolite for Efficient Propane Oxidation.
Angew Chem Int Ed Engl
November 2024
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi, P.R. China.
Article Synopsis
- Encapsulating noble metal species in zeolites can improve the performance and efficiency of catalysts used in thermal and environmental reactions, particularly with Ru which is a cost-effective alternative.
- The study developed a method combining hydrothermal processes and stepwise calcination to stabilize Ru clusters within MFI-type zeolite, leveraging special sites for better integration.
- Results indicate that the unique environment created by the Ru clusters and MFI enhances catalytic activity for alkane oxidation even at low temperatures, while maintaining stability up to 1000°C, thus providing important insights for future catalyst design.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!