Article
Chemistry, Analytical
Gwang Su Kim, Yumin Park, Joonchul Shin, Young Geun Song, Chong-Yun Kang
Summary: Gas phase chemical analysis for breath gas monitoring has great potential. Array-type sensors with high sensitivity and selectivity for target gases, combined with micro-heater and ceramic chip, show excellent detection performance. Sensor array decorated with metal catalysts can detect biomarkers CH3COCH3, NO2, and H2S for real-time monitoring.
Article
Chemistry, Multidisciplinary
Takahisa Tanaka, Yusuke Hamanaka, Taro Kato, Ken Uchida
Summary: This study demonstrates the simultaneous detection of mixed-gas components using an ionic gel-based sensor with four electrodes made of different materials, and the estimation of H2, NH3, and C2H5OH concentrations through neural-network-based inference.
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, Analytical
Seungpil Oh, Joon-Shik Park, Hoo-Jeong Lee, Hyung Mo Jeong
Summary: In this work, Cu-2(OH)(3)F/CuO hierarchical structures were synthesized and pre-annealed to improve the gas-sensing capability for acetone. The 250°C annealed samples showed the highest response to low concentrations of acetone gas. Characterization techniques were used to analyze the mechanism of pre-annealing of Cu-2(OH)(3)F.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Environmental
Jesse Nii Okai Amu-Darko, Shahid Hussain, Qiang Gong, Xiangzhao Zhang, Ziwei Xu, Mingsong Wang, Guiwu Liu, Guanjun Qiao
Summary: In this study, In2O3/PANI composites were synthesized using the hydrothermal technique to explore their sensing capabilities for NO2 gas. The gas sensing properties, such as response/recovery time, optimal temperature, and recyclability, were investigated by analyzing the morphology, purity, and crystal structures of the samples. The In2O3/PANI-1 sensors exhibited high responses, quick response and recovery times, and a low detection limit to NO2 gas at a working temperature of 250 degrees C. The fundamental detecting mechanism for NO2 gas and the electrical characteristics of the In2O3/PANI composites were also discussed.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Hongyin Zhu, Chao Liu, Yao Zheng, Jing Zhao, Lei Li
Summary: The method for breath detection using gas sensor array is gaining popularity, especially in detecting acetone as a breath marker in diabetic patients. This article utilizes seven metal oxide gas sensors to collect acetone and ethanol gas and applies kernel principal component analysis (KPCA) to extract the characteristics. The results show that the algorithm has high accuracy in qualitative identification and quantification of acetone and ethanol gases.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Nathan T. Riek, Seth So, Murat Akcakaya, Minhee Yun
Summary: Modern developments in gas sensor technology have led to smaller size, increased sensitivity, and selectivity. In our research, we utilize a sensor array featuring a hybrid combination of metals and organic polymers, along with machine learning, to detect a range of VOCs and toxic gases. Through a thorough analysis of machine learning classifiers, we determined that ensemble classifiers using normalized sensor data as features yield the best classification results.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Environmental
Zhihao Zhang, Shendan Zhang, Chunjie Jiang, Haichuan Guo, Fengdong Qu, Yuichi Shimakawa, Minghui Yang
Summary: The single-phase perovskite-type LnFeO(3) nanoparticles prepared by the citrate sol-gel method exhibit significant differences in gas response to the four typical VSCs, showing good performance, tolerance to environmental changes, and long-term stability for detecting VSCs gas at an operating temperature of 210 degrees C. A new sensor array design integrating a series of LnFeO(3) materials shows excellent recognition ability for various VSCs, promising real-time monitoring capabilities.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Pil Gyu Choi, Akihiro Tsuruta, Yoshitake Masuda
Summary: Detection and discrimination of gases are crucial in various fields and the demand for easy and fast detection of various gas substances is increasing. This study improved the sensing property by modifying carbon nanotubes (CNT) with nanosheet-type tin oxide (SnO2), resulting in superior sensing properties and improved selectivity for ammonia gas. The accuracy of ammonia gas classification was significantly increased when using the modified sensor in the sensor array, showing its potential for ammonia gas detection and discrimination.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Run-Hui Wang, Wei Wen, Shilie Zheng, Zhizhen Ye, Jin-Ming Wu
Summary: In this study, a layered mesoporous aggregate of tin oxide nanocrystals with high specific surface area and mesoporous structure was synthesized. The tin oxide showed high ethanol sensing performance at low temperatures, with high selectivity and stability. The ethanol sensing mechanism changed with increasing operating temperature.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Chenwen Lin, Zijian Du, Nongjian Tao, Di Wang
Summary: The gradient-based colorimetric array sensor (GCAS) overcomes the limitations of traditional colorimetric sensors by inkjet-printing different colorimetric sensing elements on a porous substrate in parallel straight lines. By tracking color gradients and converting them into analyte concentrations in real time, GCAS can detect multiple air pollutants and continuously monitor ambient ozone.
Article
Chemistry, Multidisciplinary
Xingtai Chen, Tao Liu, Zhaoru Li, Xi-Tao Yin
Summary: Gas sensors, especially metal oxide semiconductors, have been widely used in various fields, and modification methods such as special structures, doping, and precious metal loading can improve their gas-sensitive performance. This review summarizes the progress in the modification of metal oxides, including their response, selectivity, and operating temperature, and focuses on the gas-sensitive mechanisms. The bottlenecks and future development prospects of current metal oxide semiconductor n-Butanol gas sensors are also discussed.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Qihua Liang, Jingjing Zheng, Xiaotian Li, Bo Zhang, Ni Bai, Guo-Dong Li
Summary: Porous spinel gallate nanospheres prepared by solvothermal method and low temperature calcination exhibit excellent gas sensing properties, with CdGa2O4 nanospheres showing outstanding formaldehyde sensing performance at 120 degrees Celsius.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Biochemical Research Methods
Jingzhou Hou, Xiaofang Liu, Changjun Hou, Danqun Huo, Jiawei Li
Summary: A polyvinylidene fluoride (PVDF)-based colorimetric sensor array was designed for rapid detection of disease-related volatile organic compounds (DVOCs). Using pattern recognition, the array successfully discriminated 28 DVOCs at different concentrations and showed excellent performance in detecting VOCs produced by cancer and normal cells.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
