Article
Chemistry, Multidisciplinary
Shiben Hu, Kuankuan Lu, Honglong Ning, Rihui Yao, Yanfen Gong, Zhangxu Pan, Chan Guo, Jiantai Wang, Chao Pang, Zheng Gong, Junbiao Peng
Summary: A systematic study was conducted on the physical properties of amorphous Indium-Gallium-Zinc Oxide (a-IGZO) films prepared under various deposition conditions, revealing the significant impact of process parameters on film densities and defect states, ultimately affecting the performance of thin-film transistors (TFT) devices. By optimizing the deposition conditions of the IGZO film, high-performance TFT with specific characteristics was demonstrated.
Article
Environmental Sciences
Yuting Zhang, Yuwei Tang, Ruiping Yan, Jinchunzi Li, Chenyang Li, Shuang Liang
Summary: The conversion of hazelnut shell to biochar was found to be an effective method for removing Cr (VI) from water. The process showed excellent performance at low pH and low concentrations, and the removal mechanism involved electrostatic attraction, reduction, and complexation. This study provides a cost-effective solution for eliminating Cr (VI) from acidic wastewater and groundwater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Anshuman Satpathy, Jeffrey G. Catalano, Daniel E. Giammar
Summary: Adsorption and reduction of U(VI) on Fe(II)-bearing clay minerals can control uranium mobility in subsurface environments. The reduction of U(VI) was nearly complete at low sodium concentrations and both pH 3 and 6. At pH 6 and high sodium concentrations, U(VI) reduction was only 70%. Surface-bound U(VI) on unreduced montmorillonite was more easily extracted into solution with bicarbonate than surface-bound U(IV) generated by reduction. A nonelectrostatic surface complexation model was developed to interpret the equilibrium adsorption of U(IV) on Fe(II)-bearing montmorillonite as a function of pH and sodium concentration.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Pankaj Kumar Singh, Keita Shinzato, Hiroyuki Gi, Takayuki Ichikawa, Hiroki Miyaoka
Summary: This study systematically investigates the catalytic properties of group 4-6 element oxides, including TiO2, ZrO2, HfO2, V2O5, Ta2O5, CrO3, MoO3, and WO3, on magnesium hydride (MgH2). The dispersion of each oxide on the MgH2 surface is achieved through ball-milling. The hydrogen desorption properties are analyzed, and the oxides on MgH2 are characterized structurally and spectroscopically. Among the oxides, TiO2, V2O5, ZrO2, and CrO3 exhibit higher catalytic activity, enabling hydrogen desorption at around 200°C. The dispersion of the oxides on Mg is found to be closely related to the catalytic process, except for MoO3. Multi oxide states, particularly the 2+ and 3+ oxidation states of transition metals, contribute to the high catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Tao Jin, Long Yang, Xinyue Zhang, Wen Li, Yanzhong Pei
Summary: The symmetry of crystal structure in real space can be maintained in reciprocal space, which is important for the design of thermoelectric materials. Using the relationship between inter- and intra-layer geometric information allows for the comparison of crystal structures with desired symmetry.
Article
Chemistry, Physical
Sandeep Kumar, Abhishek Kumar, Tania Malhotra, Sakshi Verma
Summary: Pure and silver doped α-Fe2O3 semiconductor nanoparticles were synthesized and characterized in terms of their structural, optical, and surface electronic properties. The study found that silver doping had a marginal effect on the crystal structure and bandgap of the nanoparticles, and improved the dye degradation efficiency of the iron oxide nanocatalysts.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Sol Lee, Joong-Eon Jung, Han-gyu Kim, Yangjin Lee, Je Myoung Park, Jeongsu Jang, Sangho Yoon, Arnab Ghosh, Minseol Kim, Joonho Kim, Woongki Na, Jonghwan Kim, Hyoung Joon Choi, Hyeonsik Cheong, Kwanpyo Kim
Summary: A new hexagonal polymorph, gamma-GeSe, has been synthesized from the family of IV-VI monochalcogenides, with high electrical conductivity and potential for constructing vertical van der Waals heterostructures.
Article
Chemistry, Multidisciplinary
George Serghiou, Hans Josef Reichmann, Nicholas Odling, Kristina Spektor, Anna Pakhomova, Wilson A. Crichton, Zuzana Konopkova
Summary: A new cubic GeSn solid solution with eightfold coordination has been successfully synthesized at high pressures and temperatures, expanding the landscape of group IVA alloy materials. Despite the differences in crystal structures and atomic radii, the formation of this material opens up new possibilities for materials development.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Tijana Stamenkovic, Nenad Bundaleski, Tanja Barudzija, Ivana Validzic, Vesna Lojpur
Summary: The study investigates the incorporation of iodine and tin into the stibnite lattice using X-ray diffraction and X-ray photoelectron spectroscopy, revealing significant effects on the surface composition and structure of the samples. The presence of different phases at the surface, such as Sb2O3 and SnS2, suggests strong segregation of antimony and surface oxidation in doped samples.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Michel Lannoo, P. Tim Prins, Zeger Hens, Daniel Vanmaekelbergh, Christophe Delerue
Summary: By studying the absorptance spectra of nanometer-thin layers of various semiconductors, researchers have found that the optical absorptance exhibits similar characteristics to graphene, with marked plateaus at integer values of pi alpha. This quantization of absorptance is universal in semiconductor quantum wells, as long as excitonic effects are weak, and is not specific to graphene. The physical origin of this universality is explained using analytical models, which show that the absorptance is ruled by pi alpha independent of the material characteristics.
Article
Materials Science, Ceramics
Jun-Dar Hwang, You-Cheng Zhan
Summary: MgO films with different oxygen contents were deposited on ZnO substrate, and their effects on the physical properties and carrier transport in Au/MgO/ZnO MIS diodes were studied. The crystallinity of MgO films improved up to 66% oxygen content, but degraded at 100% oxygen content. The introduction of oxygen atoms compensated for oxygen vacancies in MgO films, while excess oxygen atoms absorbed on the MgO surface. The optical bandgap and roughness of MgO films increased with oxygen content. MIS diodes with 66% oxygen content exhibited reduced leakage current and Fowler-Nordheim tunnelling at high bias voltages.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Krishnamoorthy Muralirajan, Rajesh Kancherla, Jeremy A. Bau, Mayur Rahul Taksande, Muhammad Qureshi, Kazuhiro Takanabe, Magnus Rueping
Summary: The study focused on radical trifluoromethylation using Cd-chalcogenide semiconductors as visible-light-responsive heterogeneous photocatalysts, showing their potential in organic synthesis and highlighting their economic significance compared to traditional transition metal-based catalysts.
Article
Electrochemistry
Aida Raauf, David Graf, Yakup Gonullu, Praveen K. Sekhar, Michael Frank, Sanjay Mathur
Summary: The nanostructured thin film of Nd2Sn2O7 pyrochlore obtained through solution processing shows unprecedented selectivity towards hydrogen sensing, with the highest sensitivity towards H-2 detected at 300 degrees Celsius. The high efficiency and reproducibility of the investigated sensor devices indicate the potential of Nd2Sn2O7 based sensors for hydrogen safety applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Mahmoud R. M. Atalla, Simone Assali, Anis Attiaoui, Cedric Lemieux-Leduc, Aashish Kumar, Salim Abdi, Oussama Moutanabbir
Summary: Semiconductor membranes have been utilized as a platform to manipulate lattice strain and bandgap energy in GeSn semiconductor alloys, leading to the fabrication of broadband photodetectors with a record wavelength cutoff of 4.6 μm integrated on silicon. Experimental tools and optimized calculations were employed to study the crystalline quality, composition uniformity, lattice strain, and electronic band structure of the investigated materials and devices, showing significant improvement in performance compared to strained epitaxial layers. This research paves the way for scalable and flexible sensing and imaging technologies by engineering transferable mid-infrared photodetectors based on silicon-compatible strained-relaxed GeSn membranes.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yunzi Xin, Kai Odachi, Takashi Shirai
Summary: This study presents a novel method for the one-step synthesis of ultra-bright CNOs using fish scale waste through microwave pyrolysis in seconds. The obtained CNOs have a highly crystallized multiple-shelled core-state and well-functionalized surface, exhibiting visible photoluminescence, superior quantum yield, and excellent dispersibility.
Article
Engineering, Electrical & Electronic
Hemanth Kumar Bangolla, Ramesh Reddy Nallapureddy, M. C. Santhosh Kumar
Summary: In this study, Cu-rich CuInS2 chalcopyrite thin films were deposited on glass substrates by co-evaporation technique. The film deposited at 250 degrees C showed composition close to stoichiometry and had the lowest resistivity and highest mobility. These results suggest that CuInS2 thin films deposited by co-evaporation could be a potential material for photovoltaic applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Sebin Devasia, S. Shaji, D. A. Avellaneda, J. A. Aguilar Martinez, B. Krishnan
Summary: In this research, lead-free, all-inorganic, Cs3Bi2I9 perovskite-inspired films were developed using ultrasonic spray deposition at different substrate temperatures. These films demonstrate promising photodetection properties without any external bias or power consumption. The film's structural, morphological, optical, and electrical characteristics were analyzed in detail, and highly crystalline films with well-packed grains were obtained at temperatures below 325 degrees C. The Cs3Bi2I9 films showed direct band gaps of 1.8-2.1 eV and absorption coefficients of about 10^4 cm(-1). Photocurrent in the nanoampere range was observed in all the films under illumination. The films also remained chemically stable even after rapid thermal processing up to 500 degrees C. Additionally, self-powered photodetection using Ag/FTO/Cs3Bi2I9/C-Ag heterostructure was demonstrated under different illuminations, with the highest responsivity and detectivity obtained for the Cs3Bi2I9-based photodetector being 0.0051 mAW(-1) and 5.93 x 108 Jones (405 nm, 50 mW), respectively. The spray-deposited Cs3Bi2I9 films show great potential for self-powered devices, particularly in blue light detectors.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Aleena Norbert, Surya Mary Alappatt, Sareen Sarah John, Sadasivan Shaji, Stephen K. Remillard, Uday P. Deshpande, Rachel Reena Philip
Summary: In this study, copper doped cerium oxide nanoparticles were synthesized using a phytosynthesis method, and their potential application in antibacterial activity was investigated. The presence of Cu2+ occupying Ce4+/Ce3+ sites and the redox conversion of Ce4+ to Ce3+ were found to enhance the antibacterial activity of the doped nanoparticles. The characterization of the nanoparticles was done using various techniques such as X-ray diffraction, infrared spectroscopy, Raman spectroscopy, and energy-dispersive analysis of X-ray spectroscopy. The results showed that the addition of copper resulted in smaller particle sizes and the presence of different phases in the nanoparticles.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Pooja Raveendran Nair, Claudia Rosa Santiago Ramirez, Miguel Angel Gracia Pinilla, Bindu Krishnan, David Avellaneda Avellaneda, Rene Fabian Cienfuegos Pelaes, Sadasivan Shaji
Summary: The formation of black titanium dioxide (BTO) nanoparticles with enhanced visible light absorption was achieved through pulsed laser irradiation in liquids. X-ray diffraction and Raman spectroscopy confirmed the transformation of the major anatase phase to rutile for BTO. TEM and SEM provided morphological and structural confirmation, while XPS revealed shifts in Ti 2p and O 1s peaks for BTO. DRS showed reduced bandgap and enhanced visible light absorption in BTO, and photocatalytic degradation studies demonstrated superior activity under visible light.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Krishnamoorthy Shanmugaraj, Ramalinga Viswanathan Mangalaraja, Cristian H. Campos, Dinesh Pratap Singh, Radhamanohar Aepuru, Arun Thirumurugan, M. A. Gracia-Pinilla, Sadasivan Shaji
Summary: Highly active gold nanoparticles (AuNPs) immobilized on two-dimensional titanium dioxide nanosheets (AuNPs-TiO2NSs) serve as an excellent catalyst for the catalytic reduction of nitroarenes (NAs) and rhodamine B (RhB) dye in the presence of sodium borohydride (NaBH4). The catalyst exhibits excellent catalytic activity and recyclability in continuous flow fixed bed reactor. The synthetic pathway and catalytic reduction mechanism are proposed.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
P. Aabel, S. Sai Guru Srinivasan, R. Amiruddin, M. C. Santhosh Kumar
Summary: This investigation explores the bipolar switching characteristics of FTO/CZTS/Ag devices for resistive memory-switching applications. The CZTS material is deposited using the spray pyrolysis method and exhibits crystalline structure with coral-like morphology. The results demonstrate that the FTO/CZTS/Ag device possesses good memory-switching properties, making it an effective and non-toxic option for bipolar memory devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
P. Aabel, A. Anupama, M. C. Santhosh Kumar
Summary: In this study, CZTS thin films were deposited using vacuum spray pyrolysis at different substrate temperatures. The structural, elemental, optical, and electrical properties were characterized and the CZTS thin films were used as an absorber layer in cadmium-free solar cell devices. The results showed that crystalline CZTS kesterite phase was formed at 375 degrees C, and the CZTS thin films exhibited coral-reef-like morphology. The optical measurements revealed an optical band gap of 1.5 eV and a high absorption coefficient of 10(5) cm(-1), indicating a close-to-ideal absorber layer. Hall effect measurement confirmed the p-type nature of the samples. A simple heterojunction solar cell device was fabricated using CZTS as the absorber layer and Al:ZnO as the window layer, with an efficiency of 2.87%.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Paulosutty Abraham, Sadasivan Shaji, David Avellaneda Avellaneda, Josue Amilcar Aguilar-Martinez, Bindu Krishnan
Summary: In this study, sulfur incorporated ZnO thin films (ZnO:S) were prepared by ultrasonic deposition. The structure, morphology, optical and electrical properties of the films were analyzed in comparison with pristine ZnO thin films. The electronic band structures of ZnO and (ZnO:S) were also theoretically calculated using the DFT-VASP method. The ZnO and (ZnO:S) thin films exhibited hexagonal crystal structure and showed potential as window layers with improved charge extraction contacts for solar cell applications.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
N. Aravind, M. C. Santhosh Kumar
Summary: Cu2FeSnS4 (CFTS) is a promising p-type semiconducting material for thin film solar photovoltaics. Thin films of CFTS were deposited on soda lime glass substrates at different temperatures, and their structural, morphological, optical, and electrical properties were studied. The deposition temperature affected the band gap values, and the film deposited at 375 degrees C exhibited better electrical properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Characterization & Testing
B. Nidheesh Kumar, Sachinlal Aroliveetil, M. C. Santhosh Kumar, M. Nallaperumal, S. Thiruppathirajan, K. P. Sruthi Krishna, Krishnan Balasubramanian, K. K. Moideenkutty, L. Mohan Kumar
Summary: In this study, Terahertz imaging in reflection mode is used to detect debonds and inclusions in the thermal protection system of launch vehicles. Terahertz time-domain spectroscopy imaging system can distinguish between healthy and defective areas. Through Terahertz time-domain spectroscopy in transmission mode, the refractive index and absorption coefficient of individual layers are obtained, which is necessary for thickness measurement. Thickness estimation of multi-layer thermal protection systems is achieved using the time-of-flight principle and the Sparse deconvolution technique.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Chemistry, Multidisciplinary
John Paul, Kasinathan Dhivyaprasath, Mahalingam Ashok, Maniyeri Chandroth Santhosh Kumar
Summary: The photocatalytic degradation of methylene blue dye was investigated using pure and graphene oxide incorporated zinc oxide thin films as catalysts. The graphene oxide content in the precursor solution was varied and thin films were prepared using the spray pyrolysis technique. The highest graphene oxide content resulted in a degradation efficiency of 91.2% under solar irradiation.
Article
Chemistry, Physical
Akshana Parameswaran Sreekala, Bindu Krishnan, Rene Fabian Cienfuegos Pelaes, David Avellaneda Avellaneda, Josue Amilcar Aguilar-Martinez, Sadasivan Shaji
Summary: This research investigates the fabrication and characterization of SnS-Si hybrids for photodetection and photocatalysis. The results show that post-deposition annealing improves the material properties of the hybrid films. The hybrid films exhibit good performance in terms of light detection and photocatalytic activity.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Albert Paul, Bindu Krishnan, Sadasivan Shaji, David Avellaneda Avellaneda
Summary: Copper tin sulfide (Cu2SnS3) is an environmentally friendly and cost-effective semiconductor with flexible optoelectronic properties. Optimizing the sulfurization temperature improves the structure, morphology, elemental composition, and optical and electrical properties. The integration of a thin SnS layer with optimized monoclinic Cu2SnS3 as an absorber layer significantly enhances photovoltaic performance and photodetection capabilities.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Aabel Premnath, Sai Guru Srinivasan Sathyiyanarayanan, Amiruddin Rafiuddin, Santhosh Kumar Maniyeri Chandroth
Summary: This study presents the use of copper-zinc sulfide (CZS) as a switching layer in electronic devices for resistive memory applications. The investigation demonstrates that CZS material exhibits excellent switching characteristics and bipolar performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Inorganic & Nuclear
A. V. Avani, Chrisma Rose Babu, S. Shaji, E. Anila
Summary: MoO3:Ce3+ nanophosphors with different doping concentrations of cerium were synthesized by hydrothermal method. The structural, optical, and photoluminescence properties were investigated, revealing that these nanophosphors exhibit excellent emission performance and have potential applications in display and fluorescence imaging.
SOLID STATE SCIENCES
(2023)
