Article
Chemistry, Analytical
Tatsuya Iwata, Maaki Saeki, Yuki Okura, Takefumi Yoshikawa
Summary: This study introduces a novel temperature modulation method based on heater voltage for gas discrimination, which allows for acquiring information of various gas species or smells with a reduced number of sensor elements. Experimental results show that this method enhances gas discrimination performance and can be applied for gas discrimination using machine learning algorithms.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
Bin Wang, Lingchu Huang, Jianyu Zhang, Qi Lu, Shoushan Zhang, Weijia Li, Tong Wang, Huaiyuan Sun, Xishuang Liang, Fangmeng Liu, Peng Sun, Geyu Lu
Summary: This research presents a new device structure for a mixed potential gas sensor, which includes two sensitive electrodes, one counter electrode, and one reference electrode. By constructing dual electrodes and applying bias voltage, a single sensor is realized instead of a sensor array, and it exhibits good discrimination ability for different gases.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Tanju Yildirim, Meng-Qun Feng, Thuc Anh Ngo, Kota Shiba, Kosuke Minami, Genki Yoshikawa
Summary: This study utilizes acoustic transduction with a quarter wavelength resonator, a speaker, and a microphone to detect and identify gas properties. Experimental data reveals resonance frequency curves and speed of sound for each gas, while time domain data allows for multi-dimensional data analysis. The device is capable of adequately identifying gases at concentrations of at least several thousand ppm.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Wenwen Zhang, Hongtao Xiang, Yuanxi Wang, Xiao Bi, Yanzhe Zhang, Pengju Zhang, Jia Chen, Lei Wang, Yuanjin Zheng
Summary: This paper presents a gas recognition model using the wavelet transform coefficient map-capsule network (WTCM-CapsNet) that improves the accuracy of gas recognition by utilizing dynamic feature information.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
Zhenxin Wu, Hua Zhang, Hanyang Ji, Zhenyu Yuan, Fanli Meng
Summary: This paper addresses the issue of underdeveloped selectivity in metal oxide semiconductor (MOS) gas sensors by employing dynamic measurement methods. The use of a customized heating waveform, combined with algorithms such as support vector machine and principal component analysis, enables qualitative and quantitative identification of volatile organic compounds (VOCs).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Jifeng Chu, Weijuan Li, Xu Yang, Yue Wu, Dawei Wang, Aijun Yang, Huan Yuan, Xiaohua Wang, Yunjia Li, Mingzhe Rong
Summary: In this study, a sensor array was used to detect various gas mixtures, with techniques such as convolutional neural networks being effective in improving identification accuracy, and the impact of humidity on the sensor array was successfully addressed.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Gabriele Magna, Eugenio Martinelli, Roberto Paolesse, Corrado Di Natale
Summary: The standard model of artificial olfaction, which includes sensor arrays and pattern recognition algorithms, fails to achieve most of the natural olfaction features. This study bridges this gap by using a biologically derived processing algorithm on a highly redundant sensor array, and creating an over-segmented reference space using a Self-Organizing Map (SOM) to enable odor identification.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Mohamed F. Hassan, Kamal El-Sankary, Michael S. Freund
Summary: Animals have evolved to sense in complex environments using modulation behavior and sophisticated neural processing. In this study, thermal modulation of chemically diverse sensor arrays is explored to capture both diagnostic patterns and intensity information in complex environments.
Article
Nanoscience & Nanotechnology
Bin Wang, Jianyu Zhang, Tong Wang, Weijia Li, Qi Lu, Huaiyuan Sun, Lingchu Huang, Xishuang Liang, Fengmin Liu, Fangmeng Liu, Peng Sun, Geyu Lu
Summary: The performance of electrochemical gas sensors relies on the reactions at the three-phase boundary. This study developed a mixed-potential gas sensor with a counter electrode, a reference electrode, and a sensitive electrode, in which the polarization of the three-phase boundary can be adjusted by applying a bias voltage to the counter electrode. The polarized three-phase boundary significantly improved the gas-sensitive performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Pratistha Shakya, Eamonn Kennedy, Christopher Rose, Jacob K. Rosenstein
Summary: The complexity of airborne odors presents challenges and opportunities for chemical detection. By using the TruffleBot e-nose platform to collect multidimensional time series data, high-dimensional time series features can be extracted to identify subtle differences in odor concentration and composition. The application of time series features has shown great potential in improving classification accuracy and concentration estimation in various experiments.
IEEE SENSORS JOURNAL
(2021)
Review
Chemistry, Inorganic & Nuclear
Chao Zhang, Kaichun Xu, Kewei Liu, Jinyong Xu, Zichen Zheng
Summary: With the development of economy and society, the detection of carbon dioxide (CO2) has attracted more attention. Metal oxide semiconductor materials have been widely used in CO2 detection due to their various crystal structures, micro-nano morphologies, simple preparation process, and low cost. This article reviews the sensing mechanism and sensitization methods of CO2 gas sensing materials based on metal oxides, and introduces the CO2 sensing properties of chemical resistive sensors based on various metal oxide semiconductors, such as SnO2, ZnO, TiO2, and BaTiO3.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Jiri Kroutil, Alexandr Laposa, Ali Ahmad, Jan Voves, Vojtech Povolny, Ladislav Klimsa, Marina Davydova, Miroslav Husak
Summary: The research investigates the selective detection of ammonia, nitrogen dioxide, carbon oxides, acetone, and toluene using a gas sensor array based on polyaniline nanocomposites. By employing machine learning and statistical tools such as principal component analysis, a highly accurate method utilizing Gaussian process classification model is found to reach 99% accuracy in classifying six different gases.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Juan Casanova-Chafer, Rocio Garcia-Aboal, Pedro Atienzar, Marta Feliz, Eduard Llobet
Summary: This paper reports the development of a gas-sensitive nanohybrid based on octahedral molybdenum iodide clusters supported on graphene flakes. It shows that the nanomaterial can be integrated into gas sensing devices due to its ability to change electrical resistivity and optical properties when exposed to gases at room temperature. The results demonstrate excellent sensing performance of the Mo-6@Graphene hybrid for NO2 in a chemoresistive device, and outstanding detection of NH3 using an optical transduction scheme.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Automation & Control Systems
Wenwen Zhang, Yuanjin Zheng, Zhiping Lin
Summary: In this work, a cascaded approach combining a dynamic wavelet coefficient map-axial attention network model and a prelayer normalization weighted dynamic response signal-cosformer model is proposed for accurate gas identification and concentration estimation using real-time dynamic response signals.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Chemistry, Analytical
Xiaomei Han, Dan Han, Xiaoru Liu, Yi Chen, Lulu Liu, Zhihua Liu, Donghui Li, Xiuli He, Shengbo Sang
Summary: This study demonstrated a NO2 gas sensor based on p-type GaN hexagonal pits (GaN-HP) with high surface-to-volume ratio by wet etching method. The fabricated sensor showed high sensitivity, high selectivity, and fast response/recovery time. UV light was found to enhance the sensor's response to NO2 gas.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Physical
Faramarz Hossein-Babaei, Saeed Masoumi, Amirreza Noori
JOURNAL OF MATERIALS CHEMISTRY A
(2018)
Article
Chemistry, Analytical
Faramarz Hossein-Babaei, Ali Hooshyar Zare, Mohsen Gharesi
ANALYTICAL CHEMISTRY
(2019)
Article
Materials Science, Ceramics
Faramarz Hossein-Babaei, Mehdi Akbari-Saatlu
CERAMICS INTERNATIONAL
(2020)
Article
Physics, Applied
Faramarz Hossein-Babaei, Tahereh Akbari
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Analytical
Hannaneh Mahdavi, Saeideh Rahbarpour, Seyed-Mohsen Hosseini-Golgoo, Hamidreza Jamaati
Summary: Despite the successful detection performance of electronic nose in laboratories, challenges exist for their industrial use due to accuracy reduction caused by variable ambient properties, especially relative humidity (RH) variation. Classifier models designed to detect studied gases showed that when humidity level deviates from training conditions, detection accuracy decreases to less than 60%.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Faramarz Hossein-Babaei, Ehsan Yousefiazari, Milad Ghalamboran
Summary: The research introduces a novel class of pressure sensors utilizing the high pressure sensitivity of electrical conduction through the interface between a metal oxide semiconductor nanocrystallite and graphene formed under O-rich conditions. The study on ZnO/Gr interface attributes the observed pressure sensitivity to the spontaneous formation of a sparse layer of oxygen at the interface, controlling electron conduction under strain. The results are anticipated to aid in understanding and engineering of the piezoresistivity and chemiresistivity in metal oxide-Gr composites.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Seyedeh Ozra Gheibi, Abdollah Fallah Shojaei, Alireza Khorshidi, Seyed Mohsen Hosseini-Golgoo
Summary: This study successfully synthesized Ni-Cr-Al LDH and characterized it through various methods before investigating its gas sensing properties in the presence of different gases. The sensor showed high sensitivity to acetone but weaker response to alcohols.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Hannaneh Mahdavi, Saeideh Rahbarpour, Reza Goldoust, Seyed Mohsen Hosseini-Golgoo, Hamidreza Jamaati
Summary: The study found that flow rate variations have an impact on the performance of high-temperature metal oxide gas sensors, especially on response time, temperature, and sensitivity. The new chamber structure can reduce this effect, but adjustments are needed based on the sensor's operating temperature.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Multidisciplinary
S. M. Hosseini-Golgoo, M. Saeedi-Mirakmahaleh, H. Saberi
Summary: In this study, the dynamic fermentation profile of a resistive gas sensor was analyzed to optimize the process of turning green leaves into black tea and determine the quality of manufactured black tea. The results showed that the tea leaves' optimum fermentation time coincides with the second highest peak in the sensor's dynamic fermentation profile. By introducing a coordinate plane based on the first peak's amplitude and the occurrence of the second peak in the sensor's dynamic fermentation profile, the final black tea quality and the tea taster's score can be predicted with a difference of +/- 0.5 marks.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Seyed Mohsen Hosseini-Golgoo, Majid Davtalab-Ghazimahalleh
Summary: Theoretical modeling of the electrical resistance of a solid electrolyte sensor with an ionic conductor was performed in this study. The proposed model was applied to a specific composite pellet and its behavior in clean air and in the presence of NO2 was investigated. The study found that the nanostructural parameters such as grain size and grain-boundary width affected the electrical resistance and capacitance of the sample. Additionally, the study suggested that the novel nanostructure could potentially function as a p-type NO2 sensor at room temperature and lower temperatures.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Faramarz Hossein-Babaei, Ebrahim Chegini
Summary: High permittivity materials are important for organic photovoltaic devices. PEDOT:PSS, a conjugated polymer composite, has been shown to increase the permittivity of dielectric polymers. However, its high electrical conductivity and metal-polymer interfaces make accurate measurements difficult. In this study, the complex relative permittivity of PEDOT:PSS layers was determined using reactive energy estimations and electrochemical impedance spectroscopy. The results showed that PEDOT:PSS has highly anisotropic dielectric properties, with the in-plane permittivity three orders of magnitude higher than the vertical permittivity at 1.0 kHz.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Faramarz Hossein-Babaei, Alireza Karimpour
Summary: Hydrogen bonding is utilized to fabricate highly rectifying organic-inorganic interfaces, which demonstrate significantly higher rectification ratios compared to directly joined interfaces. These hydrogen-bonded interfaces have great potential in the design of organic electronic and optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Faramarz Hossein-Babaei, Mehrdad Naemidehkharghani, Reza Razmand
Summary: This study investigates the electrical properties of graphene oxide/metal (GO/M) interfaces and finds that the impedance of GO/M structures is mainly determined by the GO/M interface and depends on the nature of the metal. The GO/M interfaces are categorized into two distinct types: A-types with a specific capacitance of 0.1 mF cm-2 and B-types with capacitances in the range of 10 nF cm-2. It is also discovered that the growth of nanostructured metal oxides/hydroxides at the B-type interfaces controls their capacitances.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Engineering, Electrical & Electronic
Seyed Mohsen Hosseini-Golgoo, Majid Davtalab-Ghazimahalleh
Summary: In this letter, a new NO2 sensor was presented, which combines K2CO3 with Al2O3 in pellet form and transfers the contact points to the top of the structure. This sensor can detect NO2 at room temperature in resistometric and potentiometric modes, showing high accuracy for different concentrations of NO2.
IEEE SENSORS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Faramarz Hossein-Babaei, Saeed Masoumi, Sepehr Aghili, Morteza Shokrani
Summary: The study reveals the significant contribution of grain boundaries to the generation of Seebeck voltage in polycrystalline semiconductors, leading to the discovery of the chemithermoelectric (CTE) effect. It is found that the magnitude of CTE effect is linearly related to the intergranular potential barrier height, which can be reversibly modified by exposing the samples to H2S-contaminated air. This effect is utilized for the fabrication of a CTE-based H2S sensor, which requires no electrical power source and provides safer monitoring than traditional chemiresistive sensors.
ACS APPLIED ELECTRONIC MATERIALS
(2021)