Article
Chemistry, Physical
Yongjian Luo, Zhenxun Tang, Xiaozhe Yin, Chao Chen, Zhen Fan, Minghui Qin, Min Zeng, Guofu Zhou, Xingsen Gao, Xubing Lu, Jiyan Dai, Deyang Chen, Jun -Ming Liu
Summary: This study demonstrates that ferroelectric properties can be observed in non-capped dopant-free HfO2 thin films by adjusting the deposition temperature, oxygen pressure, and thickness. A maximum polarization strength of 14.7 mu C/cm(2) was achieved in a 7.4 nm-thick film, suggesting a new method for fabricating high-quality ferroelectric HfO2 thin films.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Stefan Andrei Irimiciuc, Sergii Chertopalov, Maksym Buryi, Zdenek Remes, Martin Vondracek, Ladislav Fekete, Michal Novotny, Jan Lancok
Summary: CuI thin films were deposited with controlled morphology, structure, and defect nature in different Ar atmospheres. Band gap tailoring was achieved by controlling the plasma ion kinetic energy. Variation in Ar pressure allowed control over the nature of vacancies. Addition of Ar resulted in preferential scattering and energy losses of Cu ions in the plasma.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Rovena Veronica Pascu, George Epurescu, Iulian Boerasu, Ana -Maria Banici Niculescu, Dumitru Manica, Alexandra Maria Isabel Trefilov, Bogdan Alexandru Sava
Summary: Samarium doped ceria thin films were successfully deposited on Si (100) substrates at 500 and 600 degrees C using Pulsed Laser Deposition. X-ray Diffraction confirmed the presence of Samarium Doped Cerium Oxide crystalline compound in the films. Atomic Force Microscopy and Scanning Electron Microscopy revealed high quality films with low roughness, especially for the sample deposited at 600 degrees C. X-ray Photoelectron Spectroscopy showed an increased proportion of Ce3+ in the deposited films compared to the target. Spectroscopic Ellipsometry analysis calculated a refractive index under 2.2 in the visible and near-infrared domain. Nanoindentation tribometric measurements indicated a decrease in elasticity modulus and hardness with increasing substrate temperature. These films show potential as electrolyte materials for new generation electrochemical devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Coatings & Films
Falko Jahn, Steffen Weissmantel
Summary: Boron carbide is a super-hard material suitable for wear resistant coatings. Its hardness is significantly influenced by substrate temperature, with little effect from laser fluence.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiangnan Gong, Menglei Feng, Hong Wu, Hongpeng Zhou, Chunhung Suen, Hanjun Zou, Lijie Guo, Kai Zhou, Shijian Chen, Jiyan Dai, Guoyu Wang, Xiaoyuan Zhou
Summary: This work focuses on improving the quality of highly (100)-oriented SnSe thin films for thermoelectric applications. By controlling key parameters during pulsed-laser deposition and performing vacuum thermal annealing, the film quality was enhanced. The best crystal quality and uniform orientation were achieved on SiO2/Si substrate at 673 K followed by thermal annealing at 673 K for 30 min, showcasing promising Seebeck coefficient and power factor values.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Condensed Matter
Marianna Batkova, F. Stobiecki, B. Szymanski, P. Kuswik
Summary: Thin films of SmB6 were prepared using pulsed laser deposition on various substrates, showing that post-deposition annealing at 600 degrees C can result in high-quality material. However, heating the substrate during deposition leads to higher resistance. The electrical resistance measurements revealed that the resistivity can be described by a two-channel model with activation energy and impurity band effects.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Jakub Holovsky, Eva Horynova, Lukas Horak, Katarina Ridzonova, Zdenek Remes, Lucie Landova, Rupendra Kumar Sharma
Summary: Molybdenum oxide is a material with high bandgap, work function, and other interesting properties. Using Pulsed Laser Deposition, researchers were able to deposit high transparency MoO3 layers from stoichiometric MoO3 and metal Mo targets at different temperatures and oxygen pressures. Optical properties were accurately tracked using Photothermal Deflection Spectroscopy and Spectral Ellipsometry, while crystallinity and surface morphology were monitored using X-ray diffraction and Scanning Electron Microscopy. Increasing temperature led to smoother, denser layers, narrowing bandgap, and increased sub-gap absorption, with crystallization occurring above 400 degrees C. Sub-gap absorption around 1000 nm depended on temperature and weakly on oxygen pressure.
Article
Chemistry, Multidisciplinary
Blandine Fontaine, Youssef Benrkia, Jean-Francois Blach, Christian Mathieu, Pascal Roussel, Ahmad I. Ayesh, Adlane Sayede, Sebastien Saitzek
Summary: Two polymorphic phases (alpha- and beta-Cu2V2O7) of copper pyrovanadate were synthesized and the mechanisms of phase transitions were studied using TGA and DSC. High temperature X-ray diffraction revealed negative thermal expansion coefficients of the lattice parameters. The optimal conditions for producing dense thin films were determined using thermogravimetric analysis and differential scanning calorimetry. The thin films exhibited a beta-Cu2V2O7 polycrystalline phase and showed absorption in the visible range, making them suitable for use as photoanodes.
Article
Chemistry, Physical
Shunli He, Lichun Zhang, Dan Tian, Zhiying Zhou, Anqi Guo, Bin Xia, Yadan Zhu, Fengzhou Zhao
Summary: In this study, high-quality Cs3Cu2Br5 thin films with good stability were prepared on GaN substrates by pulse laser deposition (PLD) for the first time. The morphology, crystal structure, and photoelectric properties of the Cs3Cu2Br5 thin films were systematically studied. A self-powered UV photodetector based on Cs3Cu2Br5/n-GaN heterojunction was fabricated, exhibiting two dominant responses in the UV region.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Teddy Tite, Cosmin Ungureanu, Mihaela Buga, Ionel Stavarache, Elena Matei, Constantin Catalin Negrila, Lucian Trupina, Adnana Spinu-Zaulet, Aurelian Catalin Galca
Summary: This research presents a synthesis method for a thin-film cathode that can enhance the electrochemical performance of batteries. V2O3 thin films were successfully synthesized on graphene/aluminum foil and tested as cathodes. The experimental results demonstrate that the V2O3 thin films exhibit superior electrochemical properties, especially with the addition of tin (5 mol%) which improves the initial capacity and cycling performance of the batteries.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
S. Lafane, P. H. Neethling, Y. Khereddine, S. Malek, S. Abdelli-Messaci
Summary: Optical second harmonic generation has been demonstrated for the first time from VO2 thin films using an 800nm femtosecond Ti:Sapphire laser. The quality of the films grown on different substrates, glass and alumina, was found to vary, resulting in differences in the observed properties.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Tianzhen Guo, Dan Wang, Yajun Yang, Xiaoyong Xiong, Kelin Li, Guanggen Zeng, Bing Li, Mohsen Ghali
Summary: CuSbSe2 has shown promising photovoltaic properties for thin film solar cells due to its environmentally friendly constituent elements. High-quality CuSbSe2 thin films were prepared by pulsed laser deposition and in-situ annealing. The results indicated a reduction in Sb2Se3 and Cu3SbSe3 content in the films after annealing, with an estimated atomic ratio of Cu:Sb:Se close to the stoichiometry ratio of CuSbSe2. The optical band gap of the annealed film met the requirements for solar cell absorber layers.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Physics, Applied
Anqi Guo, Lichun Zhang, Ning Cao, Taiping Lu, Yadan Zhu, Zhiying Zhou, Shunli He, Bin Xia, Fengzhou Zhao
Summary: Due to its ultra-wideband gap, high transmittance in the UV region, and excellent environmental stability, zinc gallium oxide (ZnGa2O4) has gained significant interest in deep-ultraviolet photodetectors. ZnGa2O4 thin film was fabricated on different substrates using pulsed laser deposition and post-annealing under an oxygen atmosphere. The choice of substrates has a significant impact on the morphology, structure, and crystal quality of the thin film. After annealing, the thin film quality was improved. The metal-semiconductor-metal photodetector exhibited excellent reproducible characteristics and fast response performance, indicating great potential in next-generation optoelectronic devices.
APPLIED PHYSICS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Deepak Goyal, C. P. Goyal, H. Ikeda, C. Gopalakrishnan, P. Malar
Summary: In this paper, CuSbSe2 chalcostibite thin films were successfully grown via pulsed laser deposition using bulk ball milled compound. The thin films exhibited near stoichiometry and favorable photovoltaic characteristics, with a band gap of around 1.2 eV observed. Material characteristics were evaluated using various techniques, including X-ray diffraction and spectroscopy studies.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
T. Roch, M. Gregor, S. Volkov, M. Caplovicova, L. Satrapinskyy, A. Plecenik
Summary: This study examined the impact of different substrates on the structure and orientation of niobium nitride thin films, revealing that films on C-Al2O3 substrate exhibited the best superconducting properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Tiantian Dai, Gang Meng, Zanhong Deng, Ying Chen, Hongyu Liu, Liang Li, Shimao Wang, Junqing Chang, Pengcheng Xu, Xinxin Li, Xiaodong Fang
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Engineering, Environmental
Junqing Chang, Zanhong Deng, Xiaodong Fang, Chaohao Hu, Lei Shi, Tiantian Dai, Meng Li, Shimao Wang, Gang Meng
Summary: In this study, a novel nanostructured material SBO/ZnO was proposed for selective detection of H2S at low temperature, exhibiting high response, low detection limit, good selectivity, and stability. The sensor is suitable for monitoring trace H2S pollutants in diverse workplaces.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Spectroscopy
Jian Wang, Min Wang, Jinglin You, Liming Lu, Songming Wan, Yongquan Wu, Shaobo Zheng
Summary: By simulating the Raman spectra of eight model clusters using density functional theory, this study investigated the effect of microstructure and bond length of W-O complexes on the characteristic wavenumbers of molten tungstates.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Materials Science, Ceramics
Xiaoye Gong, Jian Wang, Jinglin You, Min Wang, Xiaohui Tang, Fu Zhang, Kai Tang, Liming Lu, Songming Wan, Qingli Zhang
Summary: In this study, the effect of MgO on the microstructure and macroscopic thermos-physical properties of calcium silicate melt was studied using Raman spectroscopy, MAS NMR, and DFT calculation. It was found that the abundance of Q1 and Q3 species increased while the abundance of Q2 species decreased with increasing MgO content. Q3 species was found to have the largest contribution to the viscosity of the melt.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Dandan Rong, Gang Meng, Xiaodong Fang, Libing You, Zanhong Deng
Summary: In this study, p-type delafossite AgAlO2 (AAO) nanoparticles were proposed as a novel sensitive coating material for the cladding modification of LPG to develop a high-sensitivity fiber-optic ammonia sensor. The LPG optical fiber sensor showed a linear sensitivity of 2.07 pm/ppm to ammonia from 25 ppm to 400 ppm at room temperature, with short response and recovery time, as well as high selectivity to ammonia.
Article
Materials Science, Multidisciplinary
Shengjie Jiang, Songming Wan, Wen Luo, Bin Li, Jiyong Yao
Summary: This study analyzed the spectral properties of the BGSe crystal using experimental and theoretical methods, revealing that the residual absorption peak is caused by O-Se defects. This finding will help improve the quality of the crystal.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Hongyu Liu, Gang Meng, Zanhong Deng, Kazuki Nagashima, Shimao Wang, Tiantian Dai, Liang Li, Takeshi Yanagida, Xiaodong Fang
Summary: This study demonstrates a method of using temperature modulation of a single MOS sensor to recognize BTX molecules, by applying a rectangular heating waveform to activate the redox reaction at specific gas/oxide interfaces. Through signal preprocessing and data analysis methods, the features of BTX molecules can be extracted to improve recognition accuracy and stability.
Article
Materials Science, Multidisciplinary
Meng Li, Hongyu Liu, Junqing Chang, Tiantian Dai, Kazuki Nagashima, Zanhong Deng, Takeshi Yanagida, Xiaodong Fang, Gang Meng
Summary: This study demonstrates that using a sensor array composed of NiO sensors for thermal modulation can improve the discrimination of different categories of gas molecules. The peak temperature of the temperature profile is crucial in distinguishing concentration differences induced by subtle variations in electrical responses.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Ruofan Zhang, Zanhong Deng, Lei Shi, Mahesh Kumar, Junqing Chang, Shimao Wang, Xiaodong Fang, Wei Tong, Gang Meng
Summary: Recent advances in heterogeneous catalysts have shown that single atoms anchored on metal oxide nanostructures exhibit high catalyst efficiency, intriguing reactivity, and selectivity. This study successfully designed isolated Pt single atoms anchored on CuCrO2 using a combustion synthesis method, resulting in significantly enhanced H2S response characteristics and excellent selectivity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Xiao Zhao, Shimao Wang, Fuwei Zhuge, Yanan Song, Toru Aoki, Weiwei Dong, Mengyu Fu, Gang Meng, Zanhong Deng, Ruhua Tao, Xiaodong Fang
Summary: By investigating the effects of hot-pressed temperature on CsPbBr3 wafers, the conditions for preparing high-quality CsPbBr3 wafers have been optimized, and the resulting planar-type photodetectors show an ultrasensitive weak light photoresponse.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xueyan Shan, Shimao Wang, Mengyu Fu, Xiao Zhao, Toru Aoki, Volodymyr Gnatyuk, Zanhong Deng, Ruhua Tao, Xiaodong Fang, Gang Meng
Summary: This study proposes a non-contact approach based on excimer laser irradiation to precisely prepare a PbI2 passivation layer on the surface of perovskite films, resulting in a significant improvement in the performance of perovskite solar cells.
JOURNAL OF POWER SOURCES
(2023)
Article
Nanoscience & Nanotechnology
Longqing Mi, Zanhong Deng, Junqing Chang, Sunil Kumar, Meng Li, Ruofan Zhang, Dandan Rong, Mahesh Kumar, Shimao Wang, Yong He, Gang Meng
Summary: This study proposes a pulsed UV light modulation (PULM) photoactivation protocol, which allows the exploitation of nanomaterials for sensitively detecting trace toxic gas molecules. PULM enables the generation of surface reactive oxygen species and refreshes the surface of chemiresistors without the side effects of UV-induced desorption and decline of base resistance. PULM significantly improves the response rate to 20 ppb NO2 from 1.9 (continuous UV) to 131.1 (PULM UV-off) and reduces the limit of detection from 2.6 ppb (continuous UV) to 0.8 ppb (PULM) for a ZnO chemiresistor.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Yufan Zhao, Jinglin You, Jian Wang, Min Wang, Kai Tang, Liming Lu, Qingli Zhang, Songming Wan, Xiaoye Gong, Guopeng Liu
Summary: In binary K2O-GeO2 melts, both four-fold and high-fold coordinated germanium atoms exist, with four-fold coordination dominating in the melt when the K2O content exceeds a certain amount. The quantitative distribution of different Q(n) species in molten binary potassium germanates was obtained by deconvolution of the stretching vibrational bands of nonbridging oxygen of [GeO4] tetrahedra. Quantum chemistry ab initio calculations were used to design, optimize, and calculate the structure units and model clusters, which, in conjunction with experimental data, proposed a novel method to correct the experimental Raman spectra of the melts. The results revealed that four-fold coordinated germanium atoms occupy a dominant position in the melt, and the structure of [GeO4] tetrahedra gradually changes as the K2O content increases.
INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Longqing Mi, Zanhong Deng, Junqing Chang, Meng Li, Ruofan Zhang, Shimao Wang, Libing You, Xiaodong Fang, Yong He, Gang Meng
Summary: We demonstrated that the humidity tolerance of a ZnO chemiresistor can be significantly improved by H2O2 treatment. The H2O2-treated ZnO chemiresistor shows stable operation under a highly humid air background and the response to O3 can be further enhanced by pulsed UV light modulation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wen Luo, Songming Wan, Shengjie Jiang, Bin Li
Summary: The choice of flux is critical for crystal growth and a thermodynamic criterion has been proposed to guide this selection. Density functional theory computations were used to study the atomic chemical potentials in a specific eutectic system, verifying the validity of the criterion.
Article
Physics, Condensed Matter
Shivani Gohri, Jaya Madan, Rahul Pandey
Summary: This study improves the efficiency of SnS-based solar cells by implementing the glancing angle deposition approach and introducing a CZTSSe layer. The findings offer valuable insights for enhancing the design of SnS-based solar cells and making them more efficient.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Mahboubeh Yeganeh, Davoud Vahedi Fakhrabad
Summary: The lattice thermal conductivity of CdO monolayer was investigated, and it was found to be lower than that of bulk CdO due to the lower phonon lifetime and phonon group velocity. As a result, the monolayer exhibits higher thermoelectric efficiency compared to the bulk counterpart.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Shivam Srivastava, Prachi Singh, Anjani K. Pandey, Chandra K. Dixit
Summary: In this research paper, a novel equation of state (EOS) based on finite strain theories is proposed for predicting the thermo elastic properties of various materials. Extensive analysis and comparison with existing models and experimental data demonstrate the validity and effectiveness of the proposed EOS in capturing the unique thermodynamic behavior of nanomaterials, bulk metallic glasses, and superconductors. This research is of great importance in the fields of materials science, nanotechnology, and condensed matter physics.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Subrata Das, Sanjoy Kr Mahatha, Konstantin Glazyrin, R. Ganesan, Suja Elizabeth, Tirthankar Chakraborty
Summary: In this study, we investigated the structural evolution of Tb2Ti2O7 under external pressure and temperature, and confirmed the occurrence of an isostructural phase transition beyond 10 GPa pressure. This transition leads to changes in lattice parameters and mechanical properties, which can be understood in terms of localized rearrangement of atoms.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Hamze Mousavi
Summary: It has been found that undoped graphene sheet has zero states at the Fermi energy level, making it difficult for Cooper pairing to occur in the superconductive state. However, T-graphene, with physical properties similar to graphene, exhibits metallic behavior and has available electron states near the Fermi level. The gap equation for the s-wave superconductive state is derived based on the attractive Hubbard model and the Bogoliubov de Gennes equation for this two-dimensional metallic system. It is found that a nonzero critical temperature, τ, exists for different levels of electron-electron interaction, ǫ. τ has higher values when the system has electronic half band-filling, but decreases when the system does not have half band-filling. However, τ vanishes when ǫ becomes small enough near the band edges.
SOLID STATE COMMUNICATIONS
(2024)
