We report on the surface phonons of long-range ordered BaO thin films grown on Pt(0 0 1). In the thickness range between 4 and 28 ML, we find unstrained BaO(0 0 1)-([Formula: see text]) bulk-like terminated films which coincide with a Pt(0 0 1)-c([Formula: see text]) lattice periodicity. The dipole-active lattice vibrations were determined using high-resolution electron energy loss spectroscopy. For all BaO film thicknesses, a single Fuchs-Kliewer phonon-polariton is observed. Its intensity increases and its frequency softens with increasing film thickness. These thickness-dependent properties and the spectral shape are quantitatively discussed on the basis of dielectric theory, where a proper modeling requires three components: the dielectric response of the BaO film itself, the plasmonic response of the metallic substrate, and a weak damping due to a defect-induced doping within the oxide film. For a full description, also the quantization of the phonon wavevector due to the confinement within the film of finite thickness has to be taken into account.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1088/1361-648X/aaa94a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
[Durability of the anti-demineralization effects of fluoride varnish on dental root surfaces: An study].
Beijing Da Xue Xue Bao Yi Xue Ban
February 2025
Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China.
Objective: To study the durability of the anti-demineralization effects of fluoride varnish after being applied to dental root surfaces.
Methods: Coronal and radicular dentin samples were prepared from extracted human teeth. Duraphat (DP) was applied to the dentine surfaces to form a protective film.
Interface Engineering and Modulation of Nickel Oxide for High Air-Stable p-Type Crystalline Silicon Solar Cells.
Small
January 2025
Anhui Soltrend New Energy Technology Co., Ltd, Lujiang County, Hefei, 230000, China.
Dopant-free passivating contact crystalline silicon solar cells hold the potential of higher efficiency and cost down. In the hole-transport terminal, one still faces the challenge of trade-off between efficiency and stability. In this work, a H-AlO/NiO/Ni stacked hole-transport layer is proposed, where the H-AlO standing for H-rich AlO film can effectively reduce the interfacial defects and the high work function Ni metal results in a low contact resistance of 47.
View Article and Find Full Text PDFModification of the Se/MoO Rear Interface for Efficient Wide-Band-Gap Trigonal Selenium Solar Cells.
ACS Appl Mater Interfaces
January 2025
Institute of New Energy Technology, College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou 510632, China.
Trigonal selenium (t-Se) is a promising wide-band-gap photovoltaic material with a high absorption coefficient, abundant resources, simple composition, nontoxicity, and a low melting point, making it suitable for absorbers in advanced indoor and tandem photovoltaic applications. However, severe electrical losses at the rear interface of the t-Se absorber, caused by work function and lattice mismatches, limit the voltage output and overall performance. In this study, a strategy to enhance carrier transport and collection by modifying interfacial chemical interactions is proposed.
View Article and Find Full Text PDFFolic Acid-Targeted Mixed Pluronic Micelles for Delivery of Triptolide.
Polymers (Basel)
December 2024
Medical College, Inner Mongolia Minzu University, Tongliao 028043, China.
The present study aimed to explore an ideal delivery system for triptolide (TPL) by utilizing the thin-film hydration method to prepare drug-loaded, folate-modified mixed pluronic micelles (FA-F-127/F-68-TPL). Scanning electron microscopy and atomic force microscopy showed that the drug-loaded micelles had a spherical shape with a small particle size, with an average of 30.7 nm.
View Article and Find Full Text PDFDesign of Chemoresponsive Liquid Crystals Using Metal-Coordinating Polymer Surfaces.
ACS Appl Mater Interfaces
January 2025
Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States.
Liquid crystals (LCs), when interfaced with chemically functionalized surfaces, can amplify a range of chemical and physical transformations into optical outputs. While metal cation-binding sites on surfaces have been shown to provide a basis for the design of chemoresponsive LCs, the cations have been found to dissociate from the surfaces and dissolve slowly into LCs, resulting in time-dependent changes in the properties of LC-solid interfaces (which impacts the reliability of devices incorporating such surfaces). Here, we explore the use of surfaces comprising metal-coordinating polymers to minimize the dissolution of metal cations into LCs and characterize the impact of the interfacial environment created by the coordinating polymer on the ordering and time-dependent properties of LCs.
View Article and Find Full Text PDFWant 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!