Article
Optics
Simran Lambora, Asha Bhardwaj
Summary: In this study, blue emitting MoS2 quantum dots were synthesized through a colloidal method. The emission characteristics can be modified by altering the QD-dielectric interface. The interaction between the dispersing medium and MoS2 QDs was investigated, showing different optical behaviors in different dispersing dielectric media.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Multidisciplinary
Tsung-Shine Ko, Yen-Lun Chen
Summary: This study proposes a structure in which MoS2 is decorated with Au NPs on Si NSHs for SERS applications. The results show that the structure exhibits low detection limit and high enhancement factor, making it suitable for biomedical detection.
Article
Chemistry, Multidisciplinary
Mohammad S. Almomani, Naser M. Ahmed, Marzaini Rashid, M. K. M. Ali, H. Akhdar, O. Aldaghri, K. H. Ibnaouf
Summary: This study successfully fabricated high-brightness ZnO-incorporated Zinc@Silicon core-shell quantum dots with customized properties and enhanced their absorption and emission efficiency by controlling the NH4OH content, showing significant improvements in morphology and optical characteristics.
Article
Electrochemistry
Jaeyoung Choi, Jiasheng Wang, Taketoshi Matsumoto
Summary: Composite electrodes using flake-shaped Si nanopowder from swarf treated as industrial waste and ultrathin graphite sheets demonstrate better cycling performance and delithiation capacities compared to C-coated Si electrodes, attributed to the formation of GS bridges and stable frameworks.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Vyacheslav A. Timofeev, Vladimir I. Mashanov, Alexandr I. Nikiforov, Ilya V. Skvortsov, Alexey E. Gayduk, Alexey A. Bloshkin, Viktor V. Kirienko, Dmitry E. Utkin, Dmitry V. Kolyada, Dmitry D. Firsov, Oleg S. Komkov
Summary: Photonic crystals (PCs) were developed to modify the GeSiSn/Si structures surface with multiple quantum wells (MQWs) and increase the photoluminescence and photoresponse near 2 µm. The optimized GeSiSn/Si MQWs obtained by molecular-beam epitaxy were combined with PCs consisting of a periodic cylindrical hole array. Numerical simulation methods were used to optimize the hole depth and effectively excite quasi-guided modes without affecting the active layer. The result showed an increase in photoluminescence signal and photoresponse in a wide wavelength range up to 1.8 µm.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Vladimir A. Zinovyev, Zhanna V. Smagina, Aigul F. Zinovieva, Aleksei A. Bloshkin, Anatoly V. Dvurechenskii, Ekaterina E. Rodyakina, Margarita V. Stepikhova, Artem V. Peretokin, Alexey V. Novikov
Summary: The effects of resonance interaction between plasmonic and photonic modes in hybrid metal-dielectric structures with square Al nanodisk lattices coupled with a Si waveguide layer were investigated using micro-photoluminescence spectroscopy. GeSi quantum dots embedded in the waveguide served as radiation sources. Narrow photoluminescence peaks superimposed on broad bands were observed within the range of quantum dot emissions. By optimizing the parameters of the Al nanodisk lattices, the photoluminescence intensity increased by almost one order. The experimental results matched well with the theoretical calculations, confirming the realization of high-quality bound states in the continuum. These structures demonstrated potential for achieving a flat band and supporting slow light.
Article
Energy & Fuels
Katarzyna Znajdek, Natalia Gwardjan, Aleksandra Sosna-Glebska, Maciej Sibinski
Summary: The experimental research focused on improving solar cell efficiency by utilizing the photoluminescence down-shifting effect. Rare earth elements europium and dysprosium were used as active materials to enhance solar cells performance. The deposition of luminescent layers on photovoltaic protective glass was optimized using spray coating technology with various ink compositions to absorb the highest amount of UV light for better conversion effect.
Article
Materials Science, Multidisciplinary
Andreia de Morais, Luiz Gustavo T. A. Duarte, Denis A. Turchetti, Rodrigo A. Mendes, Jilian N. de Freitas, Teresa D. Z. Atvars, Fernando H. Cristovan, Raquel A. Domingues
Summary: A novel green-emitting terpolymer PFABT containing electron-pushing and electron-pulling units was synthesized via Suzuki coupling reaction. The excitation states of anthracene and benzothiadiazole in the copolymers were investigated, showing different emission characteristics. Blends of PFABT with PVK in various ratios exhibited increased energy transfer efficiency, impacting the performance of polymer light-emitting diodes emitting green light.
Article
Materials Science, Multidisciplinary
Rahul Sharma, Prince Sharma, Krishna Rani Sahoo, Soumya Sankar, V. P. S. Awana, Mahesh Kumar, Tharangattu N. Narayanan
Summary: The development of air and water stable opto-electronic devices based on metal dichalcogenides faces challenges, but researchers have successfully addressed this issue by depositing a fluorographene protective layer over monolayer MoS2. The heterostructure of fluorographene and MoS2 shows enormous photoresponse and chemical stability, outperforming the MoS2-only photodetector. The broad optical response of the fluorographene-MoS2 structure remains intact even after exposure to water or heat treatment, making it an ideal choice for high shelf-life photodetectors and solar cells.
Article
Chemistry, Multidisciplinary
Chen-Min Yang, Fang-Chung Chen
Summary: Metal nanoparticles, specifically gold nanoparticles, have position effects on the performance of perovskite light-emitting diodes. The placement of the nanoparticles directly impacts the efficiency and intensity of the devices, with different layers showing varying levels of enhancement.
Article
Chemistry, Physical
Kiran N. Chaudhari, K. K. Rajeev, Shinik Kim, Hayk Nersisyan, Artavazd Kirakosyan, Wonseok Jang, Jihoon Choi, Jong Hyeon Lee, Tae-Hyun Kim, Yeonho Kim
Summary: This study explores surface modification of carbon-coated silicon nanoparticles to enhance their capacity. The surface-modified samples exhibit higher reversible capacity and improved cyclability, which is attributed to the functional groups and the disordered carbon shell.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
Tomohisa Mizuno, Takashi Aoki, Toshiyuki Sameshima
Summary: The experimental study investigates the influence of Si surface orientation on the formation and photoluminescence properties of SiC dots. The results show that the diameter and surface density of SiC dots depend on Si surface orientation, and the photoluminescence intensity of SiC dots is strongly influenced by Si surface orientation and Si atom surface density.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Sheng Fan, Wei Li, Tengfei Li, Fei Gao, Wenzhe Hu, Shanshan Liu, Xiangyang Wang, Heyuan Liu, Zhaobin Liu, Zhi Li, Yanli Chen, Xiyou Li
Summary: In this study, three different 9,10-bis(phenylethynyl) anthracene derivatives nanoparticles were synthesized and characterized by scanning electron microscopy and spectroscopy. The results showed that these nanoparticles can undergo singlet fission reaction, but with different efficiencies depending on their structures.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Govind Pathak, Thitima Rujiralai, Gurumurthy Hegde, Rajiv Manohar
Summary: The dispersion of nanoparticles allows the tuning of optical parameters in liquid crystalline materials. This study investigates the effect of different concentrations of porous carbon nanoparticles (PCNPs) on the optical properties of a nematic liquid crystal (NLC) as a guest-host system. The presence of PCNPs leads to increased photoluminescence intensity and reduced optical bandgap in the NLC. This work is significant for applications in liquid crystal displays and the development of low bandgap materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Kinde Yeneayehu, Teshome Senbeta, Belayneh Mesfin
Summary: The optical properties of Fe3O4@Ag core/shell spherical nanostructures embedded in a dielectric host matrix were theoretically investigated in this work. Theoretical analysis based on electrostatic approximation and Maxwell-Garnet effective medium theory provided effective electric permittivity, magnetic permeability, refractive index, and absorbance. Numerical analysis showed two sets of resonance peaks in the UV and visible regions, indicating strong coupling of silver surface plasmon oscillations with semiconductor/dielectric interfaces. Additionally, resonance peaks were enhanced with an increase in metal fraction, filling fraction, or host matrix permittivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
