Article
Materials Science, Multidisciplinary
Indira Gandhi Tamizhmani, Raja Sakthivel, Ramesh Babu Ramraj, Arivanandhan Mukannan
Summary: This work investigates the impact of Ni doping on the structural, morphological, electrical, and optical characteristics of SnO2 thin films. The results show that Ni doping affects the grain size, electrical conductivity, and optical transmittance of the films. Ni-doped SnO2 films exhibit slightly different electrical properties compared to undoped films, while the 2.0 at.% Ni:SnO2 film demonstrates high optical and electrical conductivity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Mohamed Amine Dahamni, Mostefa Ghamnia, Salah Eddine Naceri, Carole Fauquet, Didier Tonneau, Jean-Jacques Pireaux, Abed Bouadi
Summary: The study investigated the surface chemical composition, structural, morphological, optical properties, and band gap values of pure and Mg-doped manganese oxide thin films. Mg-doping altered the crystalline phase and grain size of Mn3O4, resulting in a more uniform and rough surface morphology with decreased band gap values.
Article
Chemistry, Multidisciplinary
Logu Thirumalaisamy, Soundarrajan Palanivel, Karthikeyan Jeyakumar, Sethuraman Kunjithapatham, Trystan Watson, Sudhagar Pitchaimuthu
Summary: This work demonstrates an increase in electrical mobility and absorption coefficient in spray pyrolysis-deposited CuInS2 (CIS) thin films through ruthenium (Ru) doping, and for the first time, utilizes it as an efficient absorber layer in superstrate photovoltaic cells. The structural modifications caused by Ru doping result in enhanced optical properties, and the Ru-doped CIS films exhibit higher electrical and photo responses compared to pristine CIS films. Solar cells fabricated using the Ru-doped CIS films show an overall increase in power conversion efficiency.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Atul P. Jamale, Lata D. Jadhav
Summary: The study investigates the effect of crystallinity on electrode kinetics of La0.6Sr0.4Co0.2Fe0.8O3-delta, revealing that in-situ crystallization at lower temperatures during annealing can enhance the electrode conductivity and drive the diffusion of carriers in thin films.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Applied
Tomas Imrich, Hana Krysova, Michael Neumann-Spallart, Josef Krysa
Summary: In this study, precursor films of pseudobrookite, Fe2TiO5, were obtained using spray pyrolysis technique. By annealing at high temperatures, phase-pure pseudobrookite films were obtained. Electrochemical experiments showed that Fe2TiO5 electrodes exhibited n-type behavior with a maximum photocurrent of 0.35 mA/cm(2) under simulated sunlight. The valence band energy of Fe2TiO5 was estimated to be between 6.6 and 6.8 eV.
Article
Materials Science, Multidisciplinary
Adithya Prakash, V. S. Ganesha Krishna, Sahana Nagappa Moger, M. G. Mahesha
Summary: In this study, CuO thin films were successfully grown on glass substrates by spray pyrolysis technique. The structural, morphological, optical, and electrical properties of the films were thoroughly investigated. The results demonstrated that CuO films have good absorption in the visible range, indicating their potential as absorber layers in solar cells.
MATERIALS TODAY COMMUNICATIONS
(2022)
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
Engineering, Electrical & Electronic
E. A. Villegas, L. A. Ramajo, M. E. Lere, M. S. Castro, R. Parra
Summary: Pure and aluminum doped-zinc oxide thin films were grown by spray-pyrolysis method on glass substrates. The addition of Al led to changes in microstructure and grain morphology of the films. Electrical response to UV light was more intense in undoped films, with longer recovery time after interrupting illumination.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Brijlata Sharma, Rajesh Lalwani, Ruby Das, Devi Singh Raghuwanshi
Summary: Undoped and Ni-doped nanocrystalline CdS thin films were successfully fabricated using the sol-gel spin coating technique. The films exhibited polycrystalline structure with cubic orientation and an average crystallite size ranging from 6 to 12 nm. The optical band gap of the films was found to be in the range of 2.48-2.70 eV, indicating blue shifting in band edge due to quantum confinement effect. Additionally, the low temperature resistivity of the films decreased with increasing Ni concentration as observed from dc two probe measurements.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Mustafa Kavgaci, Adnan Kucukonder, Suleyman Kerli
Summary: Indium oxide and boron-doped indium oxide thin films were synthesized using the spray pyrolysis method. XRD measurements revealed a cubic structure in the films, while morphological analysis showed overall homogeneity. Experimental investigation showed that boron doping increased transmittance rates and positively contributed to radiation shielding properties in the thin films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Manu Srivathsa, Pawan Kumar, B. V. Rajendra
Summary: This study investigates the influence of substrate temperature on Zinc Oxide (ZnO) thin films synthesized on glass substrates using low-cost spray pyrolysis technique. The results show that the films deposited at 450 degrees C have the best crystallinity and altered surface morphology. The increase in substrate temperature improves the crystallinity and reduces defects. Additionally, the films deposited at 450 degrees C exhibit minimum defects and can be used as ultraviolet photodetector material.
Article
Optics
Ganesha V. S. Krishna, M. G. Mahesha
Summary: The study investigated the effect of manganese doping on zinc sulfide thin films for blue light emitting diodes, revealing enhanced blue emission at 2% manganese concentration. The absence of orange emission related to manganese was noted. Spectroscopic characterization and XPS analysis provided insights into the anomalous behavior of manganese related defects in the films.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Multidisciplinary
B. S. Nagaraja, S. C. Gurumurthy, Raghavendra Bairy, Koduri Ramam, K. Bindu, Ashok Rao
Summary: The systematic study on Zn-doped CdO thin films prepared by SP technique discovered significant changes in structural, electrical, linear, and nonlinear optical properties, indicating potential applications in optoelectronic devices.
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
Materials Science, Multidisciplinary
Esra Kus, Ayse Kucukarslan, Barbaros Demirselcuk, Emrah Sarica, Idris Akyuz, Vildan Bilgin
Summary: The study investigated the effect of Ni doping on Co3O4 films, showing that Ni doping significantly improved the crystallinity and electrical properties of the films, enhancing the electrical conductivity and making them suitable for technological applications.
Article
Chemistry, Multidisciplinary
Akmal Kosimov, Gulnara Yusibova, Jaan Aruvali, Paarn Paiste, Maike Kaarik, Jaan Leis, Arvo Kikas, Vambola Kisand, Krisjanis Smits, Nadezda Kongi
Summary: This study introduces a novel solid-phase-based methodology for the mechanosynthesis of M-N-C-type catalysts, which is low-cost, time and energy-efficient, and environmentally friendly. The resulting catalysts exhibit excellent bifunctional activity and provide a new avenue for the large-scale production of high-performance and low-cost M-N-C materials.
Article
Physics, Atomic, Molecular & Chemical
M. Kook, I Kuusik, R. Parna, T. Kaambre, A. Kikas, A. Tonisoo, J. M. Kahk, A. Kivimaki, L. Reisberg, V Kisand
Summary: The experiment explores the fragmentation patterns of different ionic liquids under VUV excitation, showing that ILs with larger anions exhibit reduced cation fragmentation. [EMMIM][TFSI] was studied for the first time, revealing unique decomposition products compared to other similar ILs. Surprisingly, certain cations were not detected in the fragmentation pattern of [EMMIM][TFSI].
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2022)
Article
Chemistry, Physical
Srinu Akula, Marek Mooste, Barr Zulevi, Sam McKinney, Arvo Kikas, Helle-Mai Piirsoo, Mihkel Rahn, Aile Tamm, Vambola Kisand, Alexey Serov, Erin B. Creel, David A. Cullen, Kenneth C. Neyerlin, Hao Wang, Madeleine Odgaard, Tatyana Reshetenko, Kaido Tammeveski
Summary: The new PGM-free PEMFC cathode catalyst materials synthesized using the VariPore (TM) method by Pajarito Powder, LLC show high activity and stability, with mesoporous structure facilitating an effective reaction path.
JOURNAL OF POWER SOURCES
(2022)
Article
Electrochemistry
Andri Sokka, Marek Mooste, Margus Marandi, Maike Kaarik, Jekaterina Kozlova, Arvo Kikas, Vambola Kisand, Alexey Treshchalov, Aile Tamm, Jaan Leis, Steven Holdcroft, Kaido Tammeveski
Summary: In this study, a novel composite material PPy/PTh/MWCNT was proposed as the catalyst for oxygen reduction reaction (ORR) at the cathode of AEMFC. The catalyst exhibited high specific surface area and tubular micro-mesoporous structure. The experimental results showed good electrocatalytic performance of the catalyst, achieving a high maximum power density in a single-cell AEMFC.
Article
Chemistry, Physical
Iris Palm, Elo Kibena-Poldsepp, Marek Mooste, Jekaterina Kozlova, Maike Kaarik, Arvo Kikas, Alexey Treshchalov, Jaan Leis, Vambola Kisand, Aile Tamm, Steven Holdcroft, Plamen Atanassov, Kaido Tammeveski
Summary: The preparation of dual heteroatom-doped SiCDC/CNT catalysts for ORR exhibited high catalytic activity and impressive performance in AEMFC tests, attributed to their high specific surface area, hierarchical porosity, high defect density, and successful doping of N and P elements.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Jaana Lilloja, Elo Kibena-Poldsepp, Ave Sarapuu, Maike Kaarik, Jekaterina Kozlova, Paarn Paiste, Arvo Kikas, Alexey Treshchalov, Jaan Leis, Aile Tamm, Vambola Kisand, Steven Holdcroft, Kaido Tammeveski
Summary: Transition metal-and nitrogen-doped mesoporous carbons were prepared, characterised, and utilized as ORR electrocatalysts in an AEMFC. Fe-N-MPC, CoFe-N-MPC and FeMn-N-MPC showed the best performance and excellent stability in alkaline solution, with Fe-N-MPC and FeMn-N-MPC exhibiting the lowest HO2- yield. FeMn-N-MPC and Fe-N-MPC reached power densities of 474 and 473 mW cm-2 in the AEMFC.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Kaidi Veske, Ave Sarapuu, Maike Kaarik, Arvo Kikas, Vambola Kisand, Helle-Mai Piirsoo, Alexey Treshchalov, Jaan Leis, Aile Tamm, Kaido Tammeveski
Summary: In this study, cobalt-containing nitrogen-doped porous carbon materials were prepared from mixtures of saccharides, cobalt nitrate, and dicyandiamide. The glucose-derived material with optimized cobalt content showed excellent ORR activity and high methanol tolerance, as well as good stability and low peroxide yield. Materials derived from various saccharides can serve as inexpensive and sustainable precursors for synthesizing active catalyst materials for anion exchange membrane fuel cells.
Article
Chemistry, Multidisciplinary
Beatriz Avila-Bolivar, Ritums Cepitis, Mahboob Alam, Juergen-Martin Assafrei, Kefeng Ping, Jaan Aruvali, Arvo Kikas, Vambola Kisand, Sergei Vlassov, Maike Kaarik, Jaan Leis, Vladislav Ivaniststev, Pavel Starkov, Vicente Montiel, Jose Solla-Gullon, Nadezda Kongi
Summary: This study presents a simple and effective method for electrochemical reduction of CO2 into formic acid using a Bi-based electrocatalyst, with experimental and theoretical investigations revealing the relationship between catalyst structure and activity.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Nanoscience & Nanotechnology
Thomas Dittrich, Jekaterina Sydorenko, Nicolae Spalatu, Norbert H. Nickel, Arvo Mere, Malle Krunks, Ilona Oja Acik
Summary: The efficient photocatalytic oxidation of organic pollutants requires the separation and transfer of photogenerated holes towards the surface, while minimizing the transfer of photogenerated electrons. This research article presents a comprehensive study on the synthesis control of charge separation and the understanding of charge kinetics and trapping passivation mechanisms at the surfaces of TiO2 thin films. By adjusting the amount of a specific precursor, the charge transfer towards the TiO2 surface can be controlled, resulting in enhanced photocatalytic decomposition of organic pollutants.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Yogesh Kumar, Elo Kibena-Poldsepp, Marek Mooste, Jekaterina Kozlova, Arvo Kikas, Jaan Aruvali, Maike Kaarik, Vambola Kisand, Jaan Leis, Aile Tamm, Steven Holdcroft, Jose H. Zagal, Kaido Tammeveski
Summary: In this study, six bimetallic N-doped carbon-based catalysts were prepared by using different carbon supports. The electrocatalytic activity of these catalysts was investigated in various configurations, including AEMFC and RZAB. FeNiN-MC and FeNiN-MWCNT catalysts exhibited excellent electrocatalytic activity, performing well in the ORR and OER.
Proceedings Paper
Engineering, Electrical & Electronic
Tanel Jalakas, Andrii Chub, Dmitri Vinnikov, Nicolae Spalatu, Viktoria Gudkova, Malle Krunks, Arvo Mere, Allan Lahi, Andre Lindvest
Summary: The article describes the practical application of energy-producing solar roadway in Estonia. It discusses the challenges faced during the research and design process and highlights the successful development of the solar roadway concept. The testing period has validated the feasibility of the concept and provided valuable experience for scientists and engineers.
2022 IEEE 63TH INTERNATIONAL SCIENTIFIC CONFERENCE ON POWER AND ELECTRICAL ENGINEERING OF RIGA TECHNICAL UNIVERSITY (RTUCON)
(2022)
Article
Chemistry, Multidisciplinary
Jekaterina Sydorenko, Arvo Mere, Malle Krunks, Marina Krichevskaya, Ilona Oja Acik
Summary: This study focuses on the development of low-material-quantity, transparent, anatase TiO2 nanoparticle free thin films as photocatalytic materials and their photocatalytic activity under UV-A and VIS light for indoor air pollution control, showing promising potential for VOC removal.
Article
Chemistry, Physical
Nimish Juneja, Sreekanth Mandati, Atanas Katerski, Nicolae Spalatu, Sarune Daskeviciute-Geguziene, Aivars Vembris, Smagul Karazhanov, Vytautas Getautis, Malle Krunks, Ilona Oja Acik
Summary: The application of Sb2S3 solar cells is limited by their low power conversion efficiency and the use of expensive hole transport materials. By using V1236 as a novel HTM instead of P3HT, the efficiency and transparency of solar cells can be improved.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Thermodynamics
Jako S. Eensalu, Kaia Tonsuaadu, Jasper Adamson, Ilona Oja Acik, Malle Krunks
Summary: The thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III) was studied using various analytical techniques to accurately identify the reaction products and intermediates formed in different atmospheres.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
