Article
Engineering, Electrical & Electronic
Nikita N. Yakovlev, Vladimir I. Nikolaev, Sergey I. Stepanov, Aleksei V. Almaev, Aleksei I. Pechnikov, Evgeny V. Chernikov, Bogdan O. Kushnarev
Summary: The electrical conductivity and gas sensitivity of alpha-Ga2O3/epsilon (kappa)-Ga2O3 structures were measured at various oxygen concentrations and temperatures. It was observed that the oxygen sensitivity of the structures depended on the donor dopant concentration. Structures doped with a specific amount of Sn showed high sensitivity to O2 at certain temperatures and bias voltages, attributed to the chemisorption of oxygen molecules on the surface reducing energy barriers between epsilon (kappa)-Ga2O3 grains.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Qi Zhang, Qian Ma, Xueying Wang, Yi Wang, Dongheng Zhao
Summary: In this study, a series of CeO2/WO2.9 composites with tunable structure and thickness were fabricated by innovating the addition of H2WO4 during the hydrothermal process. The optimal Ce/W-0.25 sensors showed a higher response value of 23.68 to 100 ppm n-butanol at room temperature compared to pure CeO2 (1.26) at 200 degrees C. The unique surface double oxygen defect engineering between CeO2 and WO2.9 played a significant role in gas sensing, the formation of the CeO2-WO2.9 heterojunction, and the effective surface/interface transport mechanism. The electron transfer between WO2.9 and CeO2 facilitated the interconversion between Ce3+ and Ce4+ driven by oxygen defects on the surface of CeO2. This work provides new insights and a facile fabrication pathway for developing novel n-butanol gas sensors with excellent sensing performance at room temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Francesca Cerciello, Osvalda Senneca, Antonio Coppola, Annunziata Forgione, Paolo Lacovig, Piero Salatino
Summary: The study revealed a significant shift in surface oxides and the desorption of CO and CO2 with increasing oxidation temperature. Epoxy moieties were prevalent under low oxygen coverages and mild oxidation temperatures, while edge carbon oxygen complexes increased as the oxidation temperature rose. The results indicate a strong correlation between the evolution of surface oxides, particularly from epoxy to ether/carbonyl, and the desorption of CO and CO2.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
Junwoo Lee, Sangwoo Lim
Summary: In order to improve the surface cleaning efficiency in semiconductor manufacturing, the study reduced the dissolved oxygen concentration in NH4OH solution to suppress oxidation of Si, and added nonionic surfactants to suppress surface roughening of Si and enhance particle removal efficiency. The results showed that when the particle-contaminated Si surface was treated with a low-DOC NH4OH solution containing a nonionic surfactant, more than 95% of particle removal efficiency and less than 0.6 nm of surface roughness were achieved.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Multidisciplinary
Maliheh Davoodabadi, Marco Liebscher, Silke Hampel, Massimo Sgarzi, Ali Bashiri Rezaie, Daniel Wolf, Gianaurelio Cuniberti, Viktor Mechtcherine, Jian Yang
Summary: This study aims to effectively incorporate multi-walled carbon nanotubes (MWCNTs) into alkali-activated materials (AAMs) for mechanical reinforcement. Different alkaline mediums were investigated for dispersing MWCNTs, with Na2SiO3-based nanofluids showing the best dispersion performance. The nanocomposites prepared with Na2SiO3-based nanofluids exhibited the highest improvements in flexural and compressive strengths.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Ceramics
Bingrong Li, Yaowu Wei, Junfeng Chen, Nan Li
Summary: The presence of tricalcium aluminate (C(3)A) in CaO specimen was found to generate slit-shaped micropores and lamellar C(4)AH(13) during the hydration process, which effectively inhibited crack propagation and the formation of macropores, improving hydration resistance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Weichun Huang, Jun Zhu, Mengke Wang, Lanping Hu, Yanfeng Tang, Yiqing Shu, Zhongjian Xie, Han Zhang
Summary: Mono-elemental Bi nanomaterials, with controlled synthesis, different shapes and sizes, and versatile applications, exhibit excellent performances in electronics/optoelectronics, energy storage and conversion, catalysis, nonlinear photonics, sensors, and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Ruijie Hou, Ziling Zeng, Shaoshan Wang, Dengfang Tang, Yuan Tan, Xingkun Chen, Wenshao Yang, Chuanqi Huang, Qing Guo, Yunjie Ding, Xueming Yang
Summary: Oxygen dissociation and surface activation are crucial in heterogeneous catalysis and oxidation processes. In this study, we conducted scanning tunneling microscopy experiments and density functional theory calculations to investigate the oxidation process on a Co(0001) surface. Our results provide atomic-level insights into the oxidation of Co(0001) at different temperatures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Mechanical
Joanna Warycha, Witold Mielcarek, Grzegorz Lesiuk
Summary: The study shows that modifying Bi2O3 in varistor materials can improve the material structure and achieve uniform distribution of conductive grain boundaries. Addition of appropriate amounts of Sb2O3 can enhance compatibility with mathematical models and reduce production costs.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Vitor A. A. Nunes, Prannoy Suraneni, Augusto C. S. Bezerra, Carlos Thomas, Paulo H. R. Borges
Summary: This study investigated the potential use of basic oxygen furnace (BOF) slag in alkali-activated matrices (AAMs), and found that under appropriate activator conditions, the slag can produce high compressive strength and reaction products, making it suitable for engineering projects that do not require high-strength materials.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Analytical
D. A. Mirabella, P. M. Desimone, M. A. Ponce, C. M. Aldao, L. F. da Silva, A. C. Catto, E. Longo
Summary: The sensitivity of gas sensors is significantly dependent on the size of SnO2 grains, potentially due to changes in oxygen vacancy density in response to variations in gas pressure. These findings help explain the relationship between film conductivity and power-law response.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Mechanical
Piyush Patil, Subin Lee, Gerhard Dehm, Steffen Brinckmann
Summary: This study investigates the influence of wear direction and crystal anisotropy on microstructure evolution by observing the deformation mechanisms in single grains. The results show that the extent of deformation and twin density are dependent on the wear direction and normal load. The study also provides insights into why some grains exhibit twinning while others do not under identical external loads.
Review
Chemistry, Analytical
Zygfryd Witkiewicz, Krzysztof Jasek, Michal Grabka
Summary: On-site detection of chemical warfare agents (CWAs) can be achieved using various analytical techniques. However, these techniques are often complex and expensive. As an alternative, analyzers based on simple semiconductor sensors are being explored. These sensors use semiconductor materials such as metal oxides, organic semiconductors, carbon nanostructures, and silicon to detect CWAs. This review summarizes the current state of knowledge and achievements in the field and discusses the prospects for the practical application of semiconductor sensors in CWA detection.
Article
Chemistry, Multidisciplinary
Rene Ebeling, Narendra P. Arasu, Lisa Bensch, Bertram Schulze Lammers, Bernhard Mayer, Thomas J. J. Mueller, Hector Vazquez, Silvia Karthaeuser
Summary: Studies have shown that inserting a flexible bridge can break the conjugation between donor-acceptor molecules on a metal substrate, preserving their reduced donor-acceptor character. This research investigates the adsorption behavior and electronic properties of a donor-bridge-acceptor dyad on a Pt(111) surface.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Electrical & Electronic
Diego J. Ramos-Ramos, Belen Sotillo, Ana Urbieta, Paloma Fernandez
Summary: The sensing behavior of samples belonging to the ZnO:CuO system was investigated, with an emphasis on sensitivity, response times, recovery, and stability under exposure to ethanol vapor at different concentrations and temperatures. The samples were characterized for morphology, composition, crystallinity, and luminescent properties in order to relate these properties to their sensing behavior.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Analytical
Jae-Hyoung Lee, Ali Mirzaei, Jae-Hun Kim, Jin-Young Kim, Abulkosim F. Nasriddinov, Marina N. Rumyantseva, Hyoun Woo Kim, Sang Sub Kim
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Materials Science, Multidisciplinary
Wei Liu, Ding Gu, Jian-Wei Zhang, Xiao-Gan Li, Marina N. Rumyantseva, Alexander M. Gaskov
Summary: Novel ZnSe/NiO heterostructure nanocomposites were prepared successfully by one-step hydrothermal method. The sensor exhibited high response to NO2 and excellent selectivity to possible interferents, making it suitable for detecting low concentrations of NO2.
Article
Chemistry, Analytical
A. S. Chizhov, M. N. Rumyantseva, K. A. Drozdov, I. Krylov, M. Batuk, J. Hadermann, D. G. Filatova, N. O. Khmelevsky, V. F. Kozlovsky, L. N. Maltseva, A. M. Gaskov
Summary: This study synthesized a ZnO/CsPbBr3 nanocomposite, showing enhanced photoresponse to different gases under light illumination and sensor response, with better performance compared to pure ZnO, and a distinct sensor response to NO2 within a temperature range.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Artem Marikutsa, Anna Novikova, Marina Rumyantseva, Nikolay Khmelevsky, Alexander Gaskov
Summary: Metal oxide semiconductors (MOS) in pristine form and functionalized by noble metals are extensively studied for gas detection, with a lack of fundamental understanding of the relations between materials composition and sensitivity to volatile organic compounds (VOC). The sensitivity to methanol was found to increase with the increase of metal-oxygen bond energy in the MOS, enhancing surface acidity and favoring adsorption. Au-functionalized metal oxides showed enhanced sensitivity to VOC, with the TiO2/Au nanocomposite exhibiting the most prominent response, attributed to a proper Ti-O bond energy and the catalytic effect of gold.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Artem Marikutsa, Lili Yang, Alexey N. Kuznetsov, Marina Rumyantseva, Alexander Gaskova
Summary: This study compared the electronic and sensing properties of bismuth tungstate and tungsten oxide, demonstrating the former's higher sensitivity to volatile organic compounds. The results indicate that W-O bond energy and charge distribution play a significant role in influencing the sensitivity to different target gases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Kseniya Prikhodko, Abulkosim Nasriddinov, Svetlana Vladimirova, Marina Rumyantseva, Alexander Gaskov
Summary: In this study, p-type oxide semiconductors Co3O4 and complex oxides NixCo3-xO4 (x = 0.04, 0.07, 0.1) were investigated for sub-ppm H2S sensing in dry and humid air. The sensor signal decreased with increasing Ni content due to a decrease in chemisorbed surface oxygen species, while it increased with rising relative humidity, indicating better surface regeneration and reactivity of surface hydroxyl groups.
Review
Chemistry, Analytical
Artem Marikutsa, Marina Rumyantseva, Elizaveta A. Konstantinova, Alexander Gaskov
Summary: The study focused on investigating the active sites and sensing behavior of metal oxide semiconductor materials with different compositions, highlighting the key role of active sites in determining the selectivity of sensor materials.
Review
Chemistry, Multidisciplinary
Artem Chizhov, Marina Rumyantseva, Alexander Gaskov
Summary: This review focuses on the principle of operation of resistive semiconductor gas sensors and the use of light activation for gas detection instead of thermal heating. It discusses the photoelectric and optical properties of nanocrystalline oxides used as sensitive materials, and explores approaches for enhancing gas sensitivity using UV and visible light activation. The review also covers methods for creating materials and enhancing sensor response mechanisms under light activation.
Article
Chemistry, Multidisciplinary
Nataliya Vorobyeva, Marina Rumyantseva, Vadim Platonov, Darya Filatova, Artem Chizhov, Artem Marikutsa, Ivan Bozhev, Alexander Gaskov
Summary: This study investigates the impact of tin doping on Gallium(III) oxide for high temperature gas sensors, with a focus on its effect on material conductivity, phase content, microstructure, adsorption sites, and gas sensor properties. The introduction of tin decreases the crystallite size of Ga2O3 and increases the formation temperature of beta-Ga2O3, leading to non-monotonous sensor responses to CO and NH3.
Article
Polymer Science
Vadim Platonov, Abulkosim Nasriddinov, Marina Rumyantseva
Summary: This study synthesized ZnO and ZnO/Pd nanofibers by electrospinning and determined their sensor properties in the detection of CO, NH3, and H-2 in different oxygen backgrounds. The results showed that in an oxygen-free atmosphere, ZnO/Pd nanofibers exhibited a significant increase in sensor response towards NH3 and H-2, which may be attributed to the formation of palladium hydride, modulation of the potential barrier at the ZnO/Pd interface, and changes in the concentration of donor defects and charge carriers in the ZnO matrix.
Article
Chemistry, Analytical
Artem Chizhov, Pavel Kutukov, Artyom Astafiev, Marina Rumyantseva
Summary: Photoactivation is a promising approach for developing gas sensors with reduced power consumption and improved sensitivity. However, the underlying theoretical basis for the processes responsible for photoactivated gas sensitivity still needs clarification. This study investigated the mechanisms of UV-activated processes on the surface of nanocrystalline metal oxides and found a correlation between photoactivated oxygen isotopic exchange activity and UV-activated oxygen gas sensitivity. The proposed model suggests that UV irradiation generates additional oxygen vacancies due to interaction with photoexcited holes.
Article
Chemistry, Multidisciplinary
Artem Chizhov, Marina Rumyantseva, Nikolay Khmelevsky, Andrey Grunin
Summary: In this study, colloidal perovskite nanocrystals were used to enhance the photoconductivity of nanocrystalline ZnO films. The synthesis process of the nanocrystalline ZnO and perovskite nanocrystals was carefully controlled, and the enhanced photoconductivity and the maximum photoconductivity values were observed. The structure, morphology, and other properties of the synthesized nanocrystals were also investigated, and the potential applications of the results were discussed.
Article
Chemistry, Analytical
Artem Chizhov, Pavel Kutukov, Alexander Gulin, Artyom Astafiev, Marina Rumyantseva
Summary: Zinc oxide is an important photocatalyst with potential applications in gas sensing, purification, and synthesis. However, its performance depends on factors such as morphology, impurity composition, and defect structure. This paper presents a method to synthesize highly active nanocrystalline ZnO using commercial ZnO micropowder and ammonium bicarbonate. The synthesized ZnO powder has a mesoporous structure and exhibits certain optical and photoluminescence properties.
Article
Chemistry, Analytical
Baoyu Huang, Xinwei Tong, Xiangpeng Zhang, Qiuxia Feng, Marina N. Rumyantseva, Jai Prakash, Xiaogan Li
Summary: MXene/NiO-composite-based formaldehyde (HCHO) sensing materials were synthesized by an in situ precipitation method. The heterostructures between MXene and NiO nanoparticles were confirmed through TEM, XRD, and XPS analyses. The chemiresistive-type sensors based on MXene/NiO-P2 displayed enhanced sensing performance to HCHO gas at room temperature. The MXene/NiO-P2 sensor exhibited good selectivity, long-term stability, and a low detection limit for HCHO gas.
Article
Chemistry, Analytical
Abulkosim Nasriddinov, Tatiana Shatalova, Sergey Maksimov, Xiaogan Li, Marina Rumyantseva
Summary: In this study, nanocrystalline In2O3 was synthesized and modified with reduced graphene oxide (rGO). Various analysis techniques characterized the obtained composites, confirming the formation of interfacial contact between In2O3 and rGO. The gas sensor properties showed that UV illumination decreased the resistance and increased the sensor response, while the presence of humidity at room temperature led to the disappearance of the response for pure In2O3 and an inversion of the sensor response for the composites.
