Article
Chemistry, Physical
Hanyang Xu, Yunjie Liu, Hui Liu, Shichang Dong, Yupeng Wu, Zegao Wang, Yimeng Wang, Mingsa Wu, Zhide Han, Lanzhong Hao
Summary: Developing hydrogen sensors with high integration and high performance remains a challenge. Two-dimensional layered tin monoselenide ultrathin films deposited on SiO2-buffered silicon substrates, decorated with a 15-nm-thickness Pd layer, show excellent room-temperature H-2 sensing performance with high response rate and fast response/recovery speed. The Pd-decorated SnSe/SiO2/Si heterojunction holds promise for high-performance sensor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Aleksandr Lenshin, Pavel Seredin, Dmitry Goloshchapov, Ali O. Radam, Andrey Mizerov
Summary: For the first time, this study demonstrates the advantages of using a compliant hybrid substrate of porSi/SiC for growing high-quality ultra-thin nanostructured AlxGa1-xN/GaN heterostructures using molecular beam epitaxy. The experimental and computational data obtained in this work are important for understanding the physics and technology of AlxGa1-xN/GaN nanoheterostructures and their potential applications in optoelectronics.
Article
Optics
Manohar Singh, Anit K. Ambedkar, Shrestha Tyagi, Virendra Kumar, Prashant Yadav, Ashwani Kumar, Yogendra K. Gautam, Beer Pal Singh
Summary: In this study, pure ZnO and Cu-doped ZnO thin films were deposited on a glass substrate using reactive co-sputtering. The structural, morphological, and optical properties of the thin films were characterized. The results showed that Cu doping modified the crystal structure, surface morphology, and optical properties of ZnO thin films. These findings are important for the research and applications of Cu-doped ZnO thin films.
Article
Physics, Multidisciplinary
Elahe Ghaleghafi, Mohammad Bagher Rahmani
Summary: This study successfully coated MoO3 thin films using a simple chemical precipitation technique at room temperature. The seed layer growth conditions and pH value of the precipitation solution were found to affect the structure and characteristics of the films, including crystallinity and bandgap. The film deposited at a higher solution's pH value showed higher photoluminescence intensity, indicating its suitability for optoelectronic applications.
Article
Optics
Mikhail Smirnov, Evgenii Roginskii, Aleksandr Savin, Aleksandr Oreshonkov, Dmitrii Pankin
Summary: Raman spectroscopy is an effective method for analyzing layered nanostructures and their interfaces. However, there is a lack of information on the phonon modes and their activity in Si/SiO2 nanostructures. This study uses computer modeling to investigate the phonon states and Raman spectra of Si/SiO2 superlattices with varying layer thicknesses. The obtained information can be used to characterize the silicon/oxide interfaces spectroscopically.
Article
Chemistry, Multidisciplinary
Ping Chen, Zexin Li, Dongyan Li, Lejing Pi, Xitao Liu, Junhua Luo, Xing Zhou, Tianyou Zhai
Summary: In this study, a new luminescent system of 2D rare earth material EuOCl with ultranarrow linewidth at room temperature is successfully synthesized. The as-synthesized EuOCl flakes exhibit abnormal temperature-dependent photoluminescent properties, opening up new possibilities for the application of 2D rare earth materials in the field of luminescence at room temperature.
Article
Chemistry, Multidisciplinary
Reshmi Sreedharan, Manu Mohan, Sonia Saini, Anupam Roy, Kuntala Bhattacharjee
Summary: The study explores the strain-induced growth of Cu at 600 degrees C and its interactions with a thermally grown SiO2 layer on the Si(111) substrate. Triangular voids and islands were observed on the surface, indicating a void-filling mechanism upon Cu deposition. Different compound phases, including an intermediate mixed Cu-O-Si state, were identified from XPS measurements, with the Cu-O-Si phase showing potential catalytic properties.
Article
Optics
Chuansong Chen, Wenjie Zhang, Pengyi Duan, Wenying Liu, Muhammad Shafi, Xiaoxuan Hu, Can Zhang, Chao Zhang, Baoyuan Man, Mei Liu
Summary: Adjusting the energy levels difference is crucial for improving the photo-induced charge transfer efficiency in surface enhanced Raman scattering (SERS) based on the chemical mechanism. This study focuses on using hybrid phase materials to enhance the SERS activity of two-dimensional selenium and tin compounds. The physical properties and energy band structure of SnSex were analyzed, and the enhanced SERS activity was attributed to the coupling of photo-induced charge transfer resonance and molecular resonance Raman scattering. The results demonstrate the relationship between physical properties and SERS activity of 2D layered materials and show the practical application of SnSex nanosheets in trace SERS detection.
Article
Chemistry, Analytical
E. Christaki, E. Vasilaki, E. Gagaoudakis, V Binas, M. Vamvakaki, A. Klini
Summary: The highly sensitive room temperature photoluminescence emission of zinc oxide in the presence of ozone is demonstrated for the first time. The optical materials, including luminescent ZnO nanoparticles and ZnO/polymer nanohybrids, are investigated for their sensing characteristics and response time upon exposure to ozone gas. The ZnO/PDMS nanohybrid shows the highest response and recovery time for ozone detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Md Tarik Hossain, Tadasha Jena, Upasana Nath, Manabendra Sarma, P. K. Giri
Summary: The success of non-van der Waals two-dimensional bismuth oxyselenide crystals in optoelectronics has opened up opportunities to explore their fundamental properties. However, the origin of photoluminescence and the effect of growth substrates on the structure and optical properties of these crystals remain unclear. This study reveals that the formation of multiple excitons in momentum valleys is responsible for broadband absorption and visible photoluminescence in few-layer thick bismuth oxyselenide. It also demonstrates that different growth substrates introduce strain and doping, thereby modulating the morphology, absorption, and photoluminescence properties.
Article
Chemistry, Physical
Prathvi, S. Asha Bhandarkar, Akshayakumar Kompa, Dhananjaya Kekuda, M. S. Murari, Maksim P. Telenkov, K. K. Nagaraja, K. Mohan Rao
Summary: The study found that with increasing Zn2+ concentration, the crystallite size of anatase phase in the thin films decreased, light absorption increased, and the bandgap narrowed. FESEM revealed a homogeneous distribution of grains in the films.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Dongke Li, Jiaming Chen, Zhaoguo Xue, Teng Sun, Junnan Han, Wanghua Chen, Etienne Talbot, Remi Demoulin, Wei Li, Jun Xu, Kunji Chen
Summary: Understanding the distribution and behavior of dopants in silicon nanocrystals is crucial for achieving controllable doping at the nanoscale and developing next-generation optoelectronic devices. This study investigates the atomic-scale distributions of phosphorus and boron dopants in silicon nanocrystal multilayers. The results show that phosphorus dopants mainly concentrate on the surfaces of silicon nanocrystals to passivate dangling bonds and provide free electrons, while boron dopants exhibit a different distribution pattern, forming a dopant-shell covering on the surfaces of silicon nanocrystals and leading to damage in the crystalline lattice.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Nicolli de Freitas, Bianca R. Florindo, Vitoria M. S. Freitas, Maria H. de O. Piazzetta, Carlos A. Ospina, Jefferson Bettini, Mathias Strauss, Edson R. Leite, Angelo L. Gobbi, Renato S. Lima, Murilo Santhiago
Summary: This research presents a simple and fast electrochemical thinning process to obtain ultra-large monolayer MoS2 on Au surfaces. The high affinity between MoS2 and Au enables the removal of bulk layers while preserving the first layer attached to the electrode. The study also explores the use of electrochemistry and optical microscopy for real-time observation of the thinning process, image treatment for estimating the thinning area and rate, and the preparation of free-standing MoS2 layers on microhole-structured Ni/Au meshes.
Article
Chemistry, Physical
A. Yu Kizjak, A. A. Evtukh, O. L. Bratus, S. Antonin, V. A. Ievtukh, O. Pylypova, A. K. Fedotov
Summary: This study investigates electron transport mechanisms in SiO2(Si)&FexOy(Fe) granular composite films. The results show variable-range hopping conductivity at low electric fields. The Efros-Shklovsky model is applicable in the temperature range of 115<180 K, while the Mott model is applicable at higher temperatures. The characteristics of traps and transport processes are determined using these models. At intermediate and high electric fields, the field enhanced thermal activation of electrons is observed, leading to a temperature independent current.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
I Parkhomenko, L. Vlasukova, I Romanov, F. Komarov, A. Mudryi, N. Kovalchuk, S. Demidovich
Summary: The impact of SiOx and SiOx/SiNx/SiOx structures on the photoluminescence of silicon nitride layer was studied. It was found that the upper silicon oxide layer can enhance the photoluminescence yield and protect the underlying nitride layer from unintended oxidation.