The aim of the presented work is to combine luminescent porous silicon (PSi) with a ferromagnetic metal (Ni) to modify on the one hand the photoluminescence by the presence of metal deposits and on the other hand to influence the optical properties by an external magnetic field. The optical properties are investigated especially with respect to the wavelength-shift of the photoluminescence due to the metal filling. With increasing metal deposits within PSi the photoluminescence peak is blue-shifted and furthermore an increase of the intensity is observed. Photoluminescence spectra of bare PSi show a maximum around 620 nm whereas in the case of Ni filled samples the peak is blue-shifted to around 580 nm for a deposition time of 15 min. Field dependent magnetic measurements performed with an applied field parallel and perpendicular to the surface, respectively, show a magnetic anisotropy which is in agreement with a thin film. This film-like behavior is caused by the interconnected Ni structures due to the branched porous silicon morphology. The coercivity increases with increasing metal deposition from about 150 Oe to about 450 Oe and also the magnetic anisotropy is enhanced with the growth of metal deposits. Within this work the influence of the magnetic metal filling on the optical properties and the magnetic characterization of the nanocomposites are discussed. The presented systems give not only rise to optoelectronics applications but also to magneto optical integrated devices.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6361743 | PMC |
| http://dx.doi.org/10.3389/fchem.2019.00041 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Triple-Negative Breast Cancer Aptamer-Targeting Porous Silicon Nanocarrier.
ACS Appl Mater Interfaces
January 2025
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, 381 Royal Parade, Parkville, Victoria 3052, Australia.
Common treatment approaches for triple-negative breast cancer (TNBC) are associated with severe side effects due to the unfavorable biodistribution profile of potent chemotherapeutics. Here, we explored the potential of TNBC-targeting aptamer-decorated porous silicon nanoparticles (pSiNPs) as targeted nanocarriers for TNBC. A "salt-aging" strategy was employed to fabricate a TNBC-targeting aptamer functionalized pSiNP that was highly colloidally stable.
View Article and Find Full Text PDFEffects of Rice Husk Ash Particle Size and Luxan Value Influence on Mortar Properties and Proposal of Hydration Ratio Measurement Method.
Materials (Basel)
December 2024
Department of Architecture, Faculty of Science and Technology, Tokyo University of Science, Noda City 278-8510, Japan.
A fundamental study has been conducted on the effective utilization of rice husk ash (RHA) in concrete. RHA is an agricultural byproduct characterized by silicon dioxide as its main component, with a content of 90% or more and a porous structure that absorbs water during mixing, thereby reducing fluidity. The quality of RHA varies depending on the calcination environment; however, the effect is not consistent.
View Article and Find Full Text PDFA self-elastic chitosan sponge reinforced with lauric acid-modified quaternized chitosan and attapulgite to treat noncompressible hemorrhage and facilitate wound healing.
Carbohydr Polym
March 2025
Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin 300071, China. Electronic address:
The development of self-elastic sponges with enhanced hemostatic and antibacterial properties to treat noncompressible hemorrhage and facilitate wound healing remains challenging. Herein, we prepared a chitosan sponge reinforced with lauric acid-modified quaternized chitosan (LQC) and attapulgite, features a porous structure, high self-elasticity, and rapid shape recovery. The incorporation of LQC conferred the sponge with an enhanced capacity to promote the adhesion, aggregation, and activation of blood cells, and resistance to infection by Staphylococcus aureus, Escherichia coli, and Methicillin-resistant Staphylococcus aureus; the incorporation of attapulgite enhanced the hydrophilicity and mechanical strength of the sponge, and its ability to activate the intrinsic and extrinsic coagulation pathways.
View Article and Find Full Text PDFThree-dimensional characterization of nanoporous membranes by capillary filling using high speed interferometry.
Rev Sci Instrum
January 2025
Dpto. de Física, Facultad de Ingeniería Química, Universidad Nacional del Litoral, S3000 Santa Fe, Argentina and Instituto de Física del Litoral, Santa Fe S3000, Argentina.
A high-speed interferometric system was developed to analyze nanostructured porous silicon (PS) membranes by measuring reflectance variations during capillary filling from both sides. A high-speed camera was employed to capture the reflectance evolution of the entire sample area with the necessary temporal resolution, providing quantitative information on filling dynamics. By integrating these data with a simple fluid dynamic model, it is possible to examine the internal structure of the membranes and determine the effective pore radii profiles along their thickness.
View Article and Find Full Text PDFInterface Engineering of Styrenic Polymer Grafted Porous Micro-Silicon/Polyaniline Composite for Enhanced Lithium Storage Anode Materials.
Polymers (Basel)
December 2024
Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnamdaero, Sujeong-Gu, Seongnam-Si 13120, Gyeonggi-do, Republic of Korea.
Si anode materials are promising candidates for next-generation Li-ion batteries (LIBs) because of their high capacities. However, expansion and low conductivity result in rapid performance degradation. Herein, we present a facile one-pot method for pyrolyzing polystyrene sulfonate (PSS) polymers at low temperatures (≤400 °C) to form a thin carbonaceous layer on the silicon surface.
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!