Article
Chemistry, Physical
Zhicheng Cai, Jiho Park, Sunghoon Park
Summary: A series of porous Au nanoparticles (NPs) decorated with In2O3 nanoparticles (NPs) was embedded in ZnO nanofibers (NFs) using electrospinning and calcination methods. The gas-sensing properties of the resulting sensors were evaluated and it was found that the addition of In2O3 improved the response properties. The sensor with 0.03 g In(NO3)3 (S2) showed excellent stability, selectivity, and a high response to NO2 gas under UV irradiation at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Francisco J. Carol-Coronel, Dina Tobia, Enio Lima, Rodolfo D. Sanchez, Martin E. Saleta
Summary: In this study, Cr1.8Ti0.2O3+z (CTO) nanoparticles with hollow microsphere structure were prepared using ultrasonic spray pyrolysis technique. Magnetic susceptibility and electron spin resonance spectroscopy revealed a para- to antiferromagnetic transition at (306 ± 1) K for CTO. Detection experiments on acetone vapors showed that CTO particles produced by ultrasonic spray pyrolysis have the potential to be highly effective volatile organic compounds detectors, with a linear response to acetone concentration. This synthesis route is economically feasible and allows for large scale production.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Taro Ueda, Inci Boehme, Takeo Hyodo, Yasuhiro Shimizu, Udo Weimar, Nicolae Barsan
Summary: The study found that the resistance of the sensor loaded with gold in dry air was lower than that of the sensor without gold. Additionally, the characteristic spectral band of oxygen adsorbates increased significantly, leading to an improvement in the adsorption of NO2.
Article
Engineering, Electrical & Electronic
Xiangzhao Zhang, Yu Zhang, Jing Wang, Siwei Liu, Zhiping Liang, Shahid Hussain, Mingsong Wang, Guiwu Liu, Guanjun Qiao
Summary: This study successfully achieved highly selective and sensitive detection of low concentrations of NO2 using Au-In2O3 composite material, with fast response and recovery time, and the ability to detect low concentrations of NO2 at room temperature.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Srecko Stopic, Felix Wenz, Tatjana-Volkov Husovic, Bernd Friedrich
Summary: The synthesis of silica particles through ultrasonic spray pyrolysis at high temperature allows for controlled morphology and size, with experimental results matching theoretical calculations. Characterization using X-ray diffraction and scanning electron microscopy is common practice. Compared to other methods, ultrasonic spray offers the advantages of easy setup of individual process segments, one-step continuous synthesis, and the ability to synthesize nanoparticles from various precursors.
Article
Materials Science, Multidisciplinary
Shou-Feng Xue, Yi-Juan Li, Feng-Hua Zheng, Xue Bian, Wen-Yuan Wu, Cheng-Hao Yang
Summary: CeO2 microspheres were prepared by one-step ultrasonic spray pyrolysis method and demonstrated to have particle sizes ranging from 0.01 to 1.08 μm, with the majority being less than 0.5 μm. However, the presence of residual chlorine in the fabricated microspheres negatively impacted the performance of SOFC. A water washing method was effective in reducing the residual chlorine content in CeO2 microspheres, providing a cleaner manufacturing process for SOFC electrode/electrolyte materials.
Article
Materials Science, Ceramics
Andre L. da Silva, Fabiane J. Trindade, Jean-Lou Dalmasso, Bruno Ramos, Antonio Carlos S. C. Teixeira, Douglas Gouvea
Summary: This research synthesized TiO2 microspheres using ultrasonic spray pyrolysis, which allowed for continuous production of TiO2 nanocrystals and promoted phase stability and limited particle coarsening. The synthesized porous anatase TiO2 microspheres exhibited superior photocatalytic activity, surpassing the commercial standard TiO2 P25 by approximately 60%.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Maryam Heidariramsheh, Sevan Gharabeiki, Seyed Mohammad Mahdavi, Nima Taghavinia
Summary: This work focused on spray pyrolysis deposition of Cu2SnS3 (CTS) thin films using a stable basic solution. The study investigated the impact of parameters such as substrate temperature and copper concentration on the structural, optical, and electrical properties of the deposited thin films. XRD and Raman analysis confirmed the formation of pure CTS films, and optical studies indicated a band gap between 1.08 and 1.2 eV for different Cu/Sn ratios.
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
Chemistry, Analytical
Ji Zhang, Fangfang Zhang, Xu Li, Qingji Wang
Summary: With the increase in the number of cars, the concentration of NO2 in the air has been continuously increasing, posing a threat to both human health and the environment. This study focuses on the development of high-performance, low detection limit NO2 sensors using flower-like Au-loaded In2O3. The results show that the sensor based on 0.5 mol% Au/In2O3 exhibits significantly improved gas-sensing properties towards NO2, with a high response value and low detection limit.
Article
Materials Science, Multidisciplinary
Ali Akbar Hussaini, Mehmet Okan Erdal, Kemal Dogan, Mustafa Koyuncu, Murat Yildirim
Summary: In recent years, there has been increasing focus on the photodiode properties of MS devices in order to enhance the performance of light sensing devices. In this study, LiCoO2 thin film was synthesized through a sol-gel-based electrospinning method and used as an interlayer for fabricating Al/LiCoO2/n-Si photodiode. The characterization results showed that the LiCoO2 thin film had a crystallite size of 37.75 nm. Electrical characterization using current-voltage and current-transient measurements demonstrated that the Al/LiCoO2/n-Si photodiode exhibited good behavior and a high rectifying ratio, with significant responsivity and detectivity. These findings suggest that LiCoO2-based devices can be utilized in optoelectronic applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Analytical
Soichiro Torai, Taro Ueda, Kai Kamada, Takeo Hyodo, Yasuhiro Shimizu
Summary: Porous (pr-)SnO2-based powders were synthesized using ultrasonic spray pyrolysis with home-made polymethylmethacrylate (PMMA) microspheres as templates. The addition of CuxO to the pr-SnO2 powder improved its sensing properties for acetone and toluene. The 0.8 wt% Cu-added pr-SnO2 sensor showed the highest acetone response at 350 degrees C. The addition of CuxO decreased the concentration of carrier electrons and the acetone-oxidation activity, leading to the improvement of the acetone-sensing properties of the pr-SnO2 sensor.
Article
Chemistry, Physical
M. M. Gomaa, M. H. Sayed, V. L. Patil, M. Boshta, P. S. Patil
Summary: This study successfully obtained nickel oxide thin films using a cost-effective chemical spray pyrolysis approach, which showed a polycrystalline cubic structure. The optical transmittance decreased with increasing deposition time, and the highest sensitivity for NO2 detection was found in the NiO thin film deposited for 5 minutes, demonstrating good stability and selectivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Rongxin Liu, Yang Ren, Huimin Cai, Cheng Zhang, Jinmei Wang, Gaoyang Zhao, Shengguo Zhang
Summary: In this study, Nb-doped TiO2 (NTO) films were fabricated on ITO glass substrates using the ultrasonic spray pyrolysis (USP) method. The effects of deposition temperature and film thickness on the microstructure and electrochromic property of NTO films were investigated. The results showed that increasing the deposition temperature improved the crystallinity and electrochromic properties of the films, while the growth direction and surface morphology of the NTO grains were strongly influenced by the film thickness. The NTO films with a thickness of 300 nm and sheet-structured grains exhibited optimal properties, allowing precise independent spectral control over material transmittance in the visible and near-infrared regions.
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
Physics, Applied
Benjamin Junker, Marco Favaro, David E. Starr, Michael Havecker, Udo Weimar, Nicolae Barsan
Summary: The development of near ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) has provided a valuable and powerful tool for spectroscopic investigations of solid-gas interfaces. By observing the changes in parameters such as chemical shifts, band bending, and valence band structure, the study on a Pt doped SnO2 sample using NAP-XPS at a synchrotron highlights the potential of this method in gas sensor research. Furthermore, DC resistance measurements have shown that the electronic characteristics and surface composition under NAP-XPS conditions are different from those at atmospheric pressure.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Analytical
S. Braun, A. Kobald, A. Oprea, I Boehme, P. Bonanati, U. Weimar, N. Barsan
Summary: This study introduces a new method for monitoring hand hygiene compliance of healthcare workers using commercial Ethanol gas sensors. Different machine learning algorithms are applied to categorize hand disinfection techniques as correct or incorrect, with the stationary sensor setup showing significantly higher accuracy compared to the portable setup.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Abdulaziz A. Alharbi, A. Sackmann, U. Weimar, N. Barsan
Summary: The research discovered that the nature of electrode materials impacts sensor performance, with platinum electrodes showing good responses to both ethylene and acetylene at 150 degrees Celsius, while gold electrodes only showed a good response to acetylene. Regardless of the electrode material, the surface reaction responsible for sensor signals occurs for acetylene, with platinum required for the reaction to occur in the case of ethylene.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Yang Liu, Ugur Geyik, Arne Kobald, Aijun Yang, Xiaohua Wang, Udo Weimar, Mingzhe Rong, N. Barasan
Summary: This study investigated the sensing performance of various commercial and homemade sensors in dry and humid conditions for monitoring the gas composition around power cables. The sensors showed different responses to gases such as 2-EH, DOTP, and benzene with potential for distinguishing between them using a sensor array and PCA method. However, a more refined pattern recognition method is necessary to accurately differentiate between 2-EH and DOTP.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Hamid Raza, Roberto Di Chio, Kaveh Movlaee, Patrick Amsalem, Norbert Koch, Nicolae Barsan, Giovanni Neri, Nicola Pinna
Summary: Heterostructures made from metal oxide semiconductors (MOS) are crucial for high-performance gas sensors. This study explores the transduction mechanism of heterostructured nanomaterials and relates the sensing response to the MOS shell or the p-n heterojunction. The use of carbon nanotubes as conductive substrates enables the devices to operate at low temperature. The findings are important for the development of next generation gas sensing devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Xiao-Xue Wang, Benjamin Junker, Carolin Ewald, Udo Weima, Xin Guo, Nicolae Barsan
Summary: Light-excited gas sensors have potential applications in reducing working temperature and power consumption. However, the mechanistic understanding of these sensors is still lacking. In this study, we demonstrate for the first time the feasibility of performing operando diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy measurements on illuminated sensors, revealing the reason for increased sensor resistance under high humidity.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Analytical
Anna Staerz, Udo Weimar, Nicolae Barsan
Summary: This review focuses on the mechanism and surface reactions of metal oxide gas sensors. Recent studies have revealed the complexity of surface reactions and discussed the influence of other adsorbates on sensor response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Ming Zhou, Yu Yao, Yutong Han, Lili Xie, Xueling Zhao, Nicolae Barsan, Zhigang Zhu
Summary: In2O3/CNH nanocomposites with different CNH concentrations were prepared via a facile solvothermal route, and their H2S sensing performance was tested. The optimal composition was found to be In2O3/CNH (2 wt%) with a sensor signal close to 3000 at an operating temperature of 70 degrees C for 2ppm H2S, showing excellent selectivity, low humidity impact, good reproducibility, and stability. The superior sensor performance is attributed to the formation of a p-n junction between CNH and In2O3, resulting in increased surface band bending and sensor response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Mehrdad Asgari, Fahimeh Hooriabad Saboor, Seyed Parsa Amouzesh, Martin Watt Coull, Abbas Ali Khodadadi, Yadollah Mortazavi, Takeo Hyodo, Yasuhiro Shimizu
Summary: SiO2/ZnO core/shell sensors were synthesized using ultrasonic-assisted deposition-precipitation method. The addition of silica as the core material enhanced the selectivity, stability, and reversibility of the sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Takeo Hyodo, Toshiro Okusa, Wataru Sakata, Taro Ueda, Yasuhiro Shimizu
Summary: This study discusses the effects of surface modification of Pt sensing electrodes with Au on the H2-sensing properties and mechanism of gas sensors based on anodized titania. The results show that the addition of Au significantly enhances the H2 response of the Pt/TiO2 sensor, and the presence of moisture further increases the H2 response.
Article
Chemistry, Analytical
Soichiro Torai, Taro Ueda, Kai Kamada, Takeo Hyodo, Yasuhiro Shimizu
Summary: Porous (pr-)SnO2-based powders were synthesized using ultrasonic spray pyrolysis with home-made polymethylmethacrylate (PMMA) microspheres as templates. The addition of CuxO to the pr-SnO2 powder improved its sensing properties for acetone and toluene. The 0.8 wt% Cu-added pr-SnO2 sensor showed the highest acetone response at 350 degrees C. The addition of CuxO decreased the concentration of carrier electrons and the acetone-oxidation activity, leading to the improvement of the acetone-sensing properties of the pr-SnO2 sensor.
Article
Chemistry, Physical
Yuma Tano, Muhammad Sohail Ahmad, Yuya Watase, Tatsuki Tsugawa, Satoko Takase, Yusuke Inomata, Kazuto Hatakeyama, Shintaro Ida, Quitain Armando, Youichi Shimizu, Tetsuya Kida
Summary: This study investigates the impact of oxygen functional groups on the graphene support material in Sn/graphene composites. It reveals that Sn nanoparticles anchored on epoxy-functionalized graphene oxide facilitate the efficient generation of formic acid. The study emphasizes the crucial role of support materials in electrocatalytic performance and offers insights into optimizing the support material for the conversion of CO2 into renewable fuels.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Materials Science, Ceramics
Takeo Hyodo
Summary: This article reviews the compositional and microstructural design techniques of various promising materials for advanced gas-sensing devices. Strict control over mesopores and macropores is achieved through self-assembly and chemical modification, respectively, resulting in improved gas reactivity and diffusivity. Temperature-modulation and light-driven operations are also effective in enhancing gas sensitivity and selectivity. These novel approaches are instrumental for further growth and development of gas sensors.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
Proceedings Paper
Chemistry, Analytical
Arne Kobald, Udo Weimar, Nicolae Barsan
Summary: Air pollution is becoming an increasingly important issue globally. This study demonstrates that temperature modulation of a multi-pixel SMOX gas sensor is a cost-effective and efficient method for detecting and quantifying pollutant gases in a wide range of concentrations in outdoor air. A convolutional neural network regression model trained on a large dataset achieved low mean relative errors in predicting pollutants in random gas mixtures, as well as relative humidity.
2022 IEEE INTERNATIONAL SYMPOSIUM ON OLFACTION AND ELECTRONIC NOSE (ISOEN 2022)
(2022)
Article
Chemistry, Physical
Yu Yao, Yutong Han, Ming Zhou, Lili Xie, Xueling Zhao, Zifeng Wang, Nicolae Barsan, Zhigang Zhu
Summary: Researchers improved the stability and electrical properties of MXenes by introducing MoO3 with oxygen vacancies and a ternary heterostructure, and successfully developed a gas sensor based on MoO3/TiO2/Ti3C2Tx. This sensor exhibits stability under high oxidation conditions and has a 20-40 times higher response to various volatile organic compounds compared to the pristine sensor, with a unique response to isopropanol vapor.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
