Article
Engineering, Electrical & Electronic
S. B. Madake, J. B. Thorat, K. Y. Rajpure
Summary: Nanocrystalline Cu-Ni-Zn ferrite thin films were deposited using the cost-effective spray pyrolysis technique and characterized for their structural, morphological, and gas sensing properties. The deposited material exhibited better responses to SO2 gas, with an optimal operating temperature of 120 degrees C and a linear response up to 50 ppm of gas exposure. This operating temperature is much lower than previously reported SO2 gas sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Thangavel Ravikumar, Logu Thirumalaisamy, Sridharan Madanagurusamy, Kalainathan Sivaperuman
Summary: Ammonia (NH3) production, storage, and transportation are susceptible to leaks, posing risks to the environment and human life. Detecting NH3 within the exposure limit is crucial for eliminating health hazards. Thin films of zinc ferrite (ZF) were deposited using spray pyrolysis at different substrate temperatures. The film deposited at 225 degrees C showed a good sensing response to 25 ppm of NH3 and exhibited stability over 90 days. This research demonstrates that ZF thin films can effectively detect NH3 in the environment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Gajanan L. Jadhav, Pankaj P. Khirade, Apparao R. Chavan, C. M. Kale, K. M. Jadhav
Summary: Cadmium-substituted cobalt ferrite thin films were synthesized by spray pyrolysis, investigating the influence of Cd2+ substitution on structural and functional properties. The results showed that Cd2+ substitution affects the structural, optical, and magnetic properties of the films. The Cd2+ substitution led to changes in the band structure and optical band gap energy, as well as a decrease in magnetic properties due to a decrease in net magnetization.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
R. Souissi, N. Bouguila, M. Bendahan, K. Aguir, T. Fiorido, M. Abderrabba, I Halidou, A. Labidi
Summary: The importance of detecting ozone and its impact on human health; Gas sensors based on In2S3 films prepared have high sensitivity and low detection limits; The gas sensor at a working temperature of 160 degrees Celsius exhibits good rapidity and selectivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
M. Balachandran, C. Thiyakarajan, R. Hari Ramprasath, T. Logu, K. Sethuraman
Summary: This study presents the preparation of nickel-doped CuGaS2 thin film photodetectors using the low-cost Chemical Spray Pyrolysis technique. The interaction of photons with CuGaS2 and its photoconductive mechanism are investigated through photoresponse studies. The results show that Ni doping reduces the optical bandgap of the CuGaS2 thin films, leading to higher absorption in the visible region. The 0.5 wt. % Ni-doped CuGaS2 photodetector device exhibits superior responsivity and detectivity.
Article
Materials Science, Multidisciplinary
C. Aparna, Pramoda Kumara Shetty, M. G. Mahesha
Summary: Zinc-doped indium oxide thin film was deposited on a glass substrate using the spray pyrolysis method. The film exhibited a polycrystalline cubic structure, with a shift in preferred growth orientation on higher doping levels. Surface morphology had a significant influence on the film's physical properties and optical transmittance decreased with doping. The presence of defects and the influence of Zn doping on the electrical properties were also confirmed.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Tingting Wang, Bingguo Xue, Hao Cui, Yingying Zhang, Manmen Liu, Jialin Chen, Ming Wen, Wei Wang, Xudong Sun, Shaohong Liu
Summary: LuAG:Ce is an important color converter in the white lighting industry, with LuAG:Ce film offering advantages such as efficient heat dissipation and rare earth conservation. The preparation process and photoluminescence performance of LuAG:Ce film were investigated, showing that increasing Ce3+ doping concentration enhanced the emission intensity. By coupling Ce3+ doped LuAG:Ce film with a blue laser, white light emission was successfully achieved.
Article
Materials Science, Multidisciplinary
Funmilayo Hannah Abejide, Akintunde Ayodeji Ajayi, Samson Ibukun Akinsola, Aderemi Babatunde Alabi
Summary: In this study, gallium oxide thin films were synthesized using the cost-effective spray pyrolysis method on silicon substrates. The chemical bonding and surface morphology were analyzed using Fourier transform infrared and scanning electron microscopy. Optical studies revealed high absorbance in the UV region and an optical band gap of 4.9 eV for the films.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
H. Fayaz Rouhi, S. M. Rozati
Summary: In this article, Tellurium doped zinc oxide thin films were prepared using a simple spray pyrolysis technique. The effects of Te doping concentration on the crystal structure, surface morphology, and optical properties of the films were investigated.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Metwally Madkour
Summary: In this study, CuxO thin films were successfully prepared using ultrasonic spray pyrolysis with a single coordinated organic source as the precursor. Various operational parameters were investigated, and the precursor and thin films were characterized using multiple techniques. By optimizing the deposition temperature, different compositions of CuxO thin films were obtained, and a heterostructured photocatalyst of CuO/Cu2O thin film exhibited enhanced photocatalytic activity with low recombination rates and improved charge assembly.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Adithya Prakash, M. G. Mahesha
Summary: This article investigates the influence of isovalent dopant Zinc on the electronic, optical, and structural characteristics of copper oxide thin films. The results show that Zinc doping effectively modifies the electrical and structural properties of the films without sacrificing their excellent optical properties.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Basavaraj G. Hunashimarad, J. S. Bhat, P. Raghavendra, R. F. Bhajantri
Summary: The photoluminescence properties of spray pyrolyzed strontium (Sr) doped tin oxide (SnO2:Sr) thin films are greatly influenced by Sr doping, leading to a redshift in optical bandgap and an increase in visible emission intensity.
Article
Materials Science, Multidisciplinary
Iping Suhariadi, Yudi Rahmawan, Diva A. M. Muyassiroh, Muhammad A. Barrinaya, Jaka F. Fatriansyah
Summary: A single-phase CuAl2O4 thin film with porous microstructure was successfully synthesized at a low temperature using ultrasonic spray pyrolysis method. The synthesized film showed good photocatalytic performance in decomposing methylene blue dye under solar irradiation.
Article
Engineering, Electrical & Electronic
P. Harishsenthil, J. Chandrasekaran, R. Marnadu, V Balasubramani
Summary: In this study, Zn@HfO2 nanorods with different zinc concentrations were prepared through the JNSP technique to improve the performance of the MIS Schottky diode Al/Zn-HfO2/n-Si. Various characterization methods were used to analyze the structure, morphology, and chemical composition of the films, showing that the incorporation of zinc ions significantly improved the diode performance.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Ceramics
Maojun Ran, Zhong Yu, Ke Sun, Chuanjian Wu, Hao Qing, Hai Liu, Zhongwen Lan, Xiaona Jiang
Summary: In this study, Ni0.17Zn0.52Fe2.31O4 ferrite thin films were deposited on glass substrates using the spin-spray technique with aqueous ethanol solutions. The addition of 3% ethanol led to the most evident columnar morphology and optimal magnetic properties in the coated samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Andris Sutka, Linards Lapcinskis, Osvalds Verners, Liva Germane, Krisjanis Smits, Arturs Pludons, Sergejs Gaidukovs, Martins Zubkins, Kaspars Pudzs, Peter Cameron Sherrell, Juris Blums
Summary: This study presents a frictional electrification polymer inspired by the ordering in spider silk, which shows enhanced contact electrification by adding α-FeOOH nanowires. Experimental results demonstrate that this structural design can effectively promote mechanical energy harvesting of materials.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Biochemistry & Molecular Biology
Svetlana Vihodceva, Vasily Bankovskis, Olga Muter, Andris Sutka
Summary: This study reports the impact of Ca2Fe2O5 porous powder on the yeast Candida utilis and finds that the growth of C. utilis is inhibited by Ca2Fe2O5 in a time-dependent manner. The study also highlights the influence of the yeast's growth phase on its resistance to Ca2Fe2O5.
Article
Chemistry, Multidisciplinary
Svetlana Vihodceva, Andris Sutka, Maarja Otsus, Heiki Vija, Liga Grase, Anne Kahru, Kaja Kasemets
Summary: This study demonstrates a facile and rapid approach for preparing composite coatings with good adhesion and interface location at room temperature. The synthesized coating exhibits rapid inhibition of bacterial growth under visible-light illumination, showing potential for antibacterial applications.
Article
Biochemistry & Molecular Biology
Mairis Iesalnieks, Raivis Eglitis, Talis Juhna, Krisjanis Smits, Andris Sutka
Summary: This study successfully prepared a transparent titanium dioxide coating on plastic substrates and demonstrated its high performance in photocatalytic degradation of organic pollutants. The coating can be applied to polymer substrates and exhibits good stability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Martin Timusk, Ines Anett Nigol, Sergei Vlassov, Sven Oras, Triin Kangur, Artis Linarts, Andris Sutka
Summary: This study demonstrates a method of preparing low-density PDMS foams using water-based thixotropic fluids as porogens. The use of synthetic hectorite clay and nanocellulose as thixotropic fluids allows for the formation of fine emulsions with small droplet sizes. By carefully destabilizing the emulsion during the curing process of the PDMS matrix phase, foams with interconnected porosity, fast drying, and uniform porous structure can be obtained. These foams exhibit a range of mechanical properties and can achieve low densities and thermal conductivities.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Electrochemistry
Ramona Durena, Anzelms Zukuls, Martins Vanags, Andris Sutka
Summary: We report a rechargeable membrane-less amphoteric aqueous Zn-MnO2 battery with a high open circuit potential and good stability and charge-discharge cycling capability. Experimental results show that using appropriate electrolytes in alkaline, acidic, and neutral environments can widen the potential window and avoid gas evolution reactions.
ELECTROCHIMICA ACTA
(2022)
Article
Biochemistry & Molecular Biology
Andris Sutka, Linda Mezule, Viktorija Denisova, Jochen Meier-Haack, Akshay Kulkarni, Sanda Bitina, Krisjanis Smits, Svetlana Vihodceva
Summary: This study presents a scalable and rapid method for producing antibacterial coatings on flexible polymer substrates. By spin-coating a slurry of ZnO nanoparticles in toluene, a stable modification layer was obtained on polystyrene and poly(ethylene-co-vinyl acetate) substrates, showing high antibacterial efficiency.
Article
Chemistry, Multidisciplinary
Artis Linarts, Peter C. Sherrell, Kaspars Malnieks, Amanda V. Ellis, Andris Sutka
Summary: A new paradigm of triboelectric polymers, the triboelectric laminate, is reported, which shows electromechanical response comparable to polyvinylidene difluoride. The response in the laminate arises from aligned dipoles generated by contact electrification. The loose interface between different polymer fibers ensures friction and triboelectric charging.
Article
Chemistry, Multidisciplinary
Andris Sutka, Fa-Kuen Shieh, Martynas Kinka, Linards Lapcinskis, Chien-Chun Chang, Phuc Khanh Lam, Kaspars Pudzs, Osvalds Verners
Summary: MOFs have been effectively used to enhance the triboelectric charge of polymers. The main mechanism for MOF triboelectrification in contact with metals is electron transfer.
Review
Electrochemistry
Janis Kleperis, Gunars Bajars, Liga Grinberga, Guntars Vaivars, Juris Purans, Girts Vitins, Gints Kucinskis
Summary: Solid state ionics is a key research topic at the Institute of Solid State Physics, University of Latvia. Their research spans from electrochromic phenomena to materials for rechargeable batteries and hydrogen energy. The institute is recognized as one of the leading centers in the USSR and Eastern Europe and continues to excel in the field of solid state ionics. Their extensive historical review highlights the development and achievements of solid state ionics from the institute's establishment to the present day. Currently, they collaborate with partners across Europe and beyond, further establishing themselves as a center of research excellence in solid state ionics.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Energy & Fuels
Ansis Mezulis, Christiaan Richter, Peteris Lesnicenoks, Ainars Knoks, Sarunas Varnagiris, Marius Urbonavicius, Darius Milcius, Janis Kleperis
Summary: This study aims to explain the kinetics of aluminum hydrolysis reaction by using a suitable theoretical model and machined aluminum waste chips with alkali solutions. The purpose is to evaluate the optimal concentration of alkali for small- and medium-scale green hydrogen production. By analyzing surface chemical reactions and mass transfer rate steps, the researchers obtained important parameters and achieved a high yield of H-2 gas. The estimation of profit takes into account the price and consumption of alkali, and reveals positive profit even with the use of chemical-grade alkali.
Article
Materials Science, Multidisciplinary
Liva Germane, Linards Lapcinskis, Mairis Iesalnieks, Andris Sutka
Summary: We have demonstrated a method to significantly enhance the triboelectric charge in the contact-separation of identical PDMS contact layers by three orders of magnitude. This improvement is achieved by functionalizing the PDMS with self-assembled monolayers (SAMs) and combining rough and smooth surfaces. The SAM-modified PDMS exhibits a more stable surface charge compared to pristine PDMS.
MATERIALS ADVANCES
(2023)
Proceedings Paper
Green & Sustainable Science & Technology
Laila Zemite, Janis Kleperis, Ansis Mezulis, Ilmars Bode, Liga Vempere, Aivo Jasevics, Leo Jansons
Summary: This article discusses the importance of biomethane in the development of Latvia's energy supply system and proposes various measures for its production and support, which have a positive impact on achieving climate neutrality.
2022 IEEE INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING AND 2022 IEEE INDUSTRIAL AND COMMERCIAL POWER SYSTEMS EUROPE (EEEIC / I&CPS EUROPE)
(2022)
Article
Chemistry, Multidisciplinary
Martins Vanags, Guntis Kulikovskis, Juris Kostjukovs, Laimonis Jekabsons, Anatolijs Sarakovskis, Krisjanis Smits, Liga Bikse, Andris Sutka
Summary: Energy storage and delivery are crucial for managing renewable power sources, and hydrogen energy is proposed as a major substitute for this purpose. However, membrane separation in single-cell water electrolysis poses a challenge. Decoupled water electrolysis has been proposed as a solution, with hydrogen and oxygen generated in separate alkaline cells. The proposed amphoteric decoupled electrolysis method using an auxiliary electrode shows higher electrolysis efficiency compared to traditional alkaline-based decoupled electrolysis.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Raivis Eglitis, Andris Sutka
Summary: Photochromic materials, such as TiO2 nanoparticles, can modulate light transmittance for privacy or energy saving purposes. However, applying suspensions in real window devices is challenging due to possible leaking. In this study, TiO2 quantum dot-based gels were prepared and showed comparable performance to colloidal counterparts in terms of photodarkening and transmittance recovery. These gels have the potential application as photochromic windows.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2022)
