Review
Engineering, Electrical & Electronic
Luyu Wang, Jia Song
Summary: This review provides an overview of commonly used gas sensing techniques for detecting aniline vapor and discusses the different sensing materials used. It concludes with an outlook for the future development of high-performance aniline sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Physical
Wael A. Amer, Ahmed F. Rehab, Mona E. Abdelghafar, Nagy L. Torad, Ahmed S. Atlam, Mohamad M. Ayad
Summary: Carbon quantum dots (CQDs) were synthesized using a green and economical hydrothermal method, and their optical and structural properties were studied. The sensing properties of CQDs, particularly towards volatile formaldehyde, were investigated, showing high sensitivity and potential for formaldehyde vapor detection.
Article
Nanoscience & Nanotechnology
Ki-Joong Kim, Jeffrey T. Culp, Paul R. Ohodnicki, Praveen K. Thallapally, Jinhui Tao
Summary: Mg-MOF-74, known for its high CO2 uptake, can be synthesized into high-quality films using the VAC process. By optimizing precursor solutions and investigating synthesis parameters like temperature, time, and droplet volume, the growth, crystallinity, and thickness of VAC Mg-MOF-74 films can be affected. These films exhibit well-defined microporosity and stable adsorption behavior across a range of CO2 concentrations.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Riris Sukowati, Yadi Mulyadi Rohman, Bertolomeus Haryanto Agung, Dian Ahmad Hapidin, Herlina Damayanti, Khairurrijal Khairurrijal
Summary: Quartz crystal microbalances coated with different morphologies (spherical-beaded, spindle-beaded, and pure nanofiber) of polyvinylpyrrolidone (PVP) nanofibers were used for ethanol vapor detection. The spherical-beaded nanofiber coating showed the highest BET-specific surface area, resulting in improved sensor sensitivity, limit of quantification (LOQ), limit of detection (LOD), and sensor response. The QCM coated with spherical-beaded nanofiber demonstrated a sensitivity of 2.632 Hz/ppm, lower LOD and LOQ of 0.018 ppm and 0.061 ppm, and better response compared to the other coatings. Freundlich adsorption isotherm was found to be the most suitable model for describing ethanol vapor adsorption on the sensor. The high sensitivity of the sensor to ethanol vapor was attributed to hydrogen bonding interactions between the sensor and the ethanol molecules. This study highlights the importance of modifying the morphology of the nanofibrous coating layer for improving the performance of QCM-based sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Environmental
Nagy L. Torad, Jeonghun Kim, Minjun Kim, Hyunsoo Lim, Jongbeom Na, Saad M. Alshehri, Tansir Ahamad, Yusuke Yamauchi, Miharu Eguchi, Bing Ding, Xiaogang Zhang
Summary: This study demonstrates the preparation of various nanoporous carbons by carbothermal treatment of ZIF crystals under different gas atmospheres, and investigates their sensitivity and selectivity towards volatile aromatic compounds. The growth of hairy graphitic-like CNTs on the surface of CNT-rich NPCs acts as highly selective sensing antennae for the discrimination of toxic aromatic hydrocarbons. Despite increased selectivity, the sacrifice of surface area in CNT-rich NPCs derived from certain ZIFs limits their potential applications in gas sensing.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Analytical
Wei Pan, Xianhe Huang, Qiao Chen
Summary: This study theoretically analyzes the impact of different sizes of dot ring and dot double-ring electrodes on the mass sensitivity distribution of the quartz crystal microbalance (QCM), and proposes a dot triple-ring electrode to enhance uniformity. The research provides a new direction for improving the uniformization of QCM mass sensitivity distribution.
ANALYTICAL CHEMISTRY
(2021)
Article
Optics
Mirit Hen, Leroy Dokhanian, Etai Grunwald, Matan Slook, Moshe Katzman, Maayan Priel, Olga Girshevitz, Avi Zadok
Summary: In this work, the analysis of elastic properties of thin layers deposited on surface acoustic wave-photonic devices is proposed and demonstrated. By measuring the changes in the group velocity of surface acoustic waves after deposition of thin layers, estimates for Young's modulus of these layers can be obtained.
Article
Engineering, Environmental
Xiu-Li Yang, Rong-Bin Zang, Rong Shao, Rong-Feng Guan, Ming-Hua Xie
Summary: In this study, a pair of UiO-MOF enantiomers (UiO-tart) were fabricated through post-modification, which can be further developed into enantiomeric sensors (UiO-tart@Au). These sensors displayed high enantioselectivity with a reported enantioselective factor of 5.97 +/- 0.54, the best performance reported so far.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Luyu Wang, Jia Song, Chenghai Ruan, Shengyang Xu, Chunyang Yu
Summary: An urgent need for a dual gas disaster sensor that can detect methane (CH4) and carbon monoxide (CO) at room temperature has been addressed. A sensing platform was created using molybdenum sulfide (MoS2) nanoflowers modified on a Quartz Crystal Microbalance (QCM) without heating. This sensor demonstrated dual sensitivity to CH4 and CO with ppm concentration at room temperature, and showed good short-term repeatability and long-term stability over two months. It proves to be a promising tool for monitoring coal mine gas.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Luyu Wang, Jia Song, Yuhang Wu, Chunyang Yu
Summary: Developing a long-term stable gaseous formaldehyde (HCHO) sensor is urgent. The modified Titanium dioxide (TiO2) nanorods on the Quartz Crystal Microbalance (QCM) sensing platform demonstrate excellent HCHO detection capabilities with a low detection limit of 50 ppb at normal temperature. The sensor also exhibits short response and recovery times of 10 s and 13 s, respectively, and satisfactory selectivity and short-term repeatability. Furthermore, the molecular formula of hydrate HCHO (HCHO•βH2O) in real air containing humidity is elucidated as HCHO•2.03-2.35H2O within a relative humidity range of 50-90%.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Environmental
Silvia Chowdhury, Nagy L. Torad, Aditya Ashok, Gilang Gumilar, Watcharop Chaikittisilp, Ruijing Xin, Ping Cheng, Md Ikram Ul Hoque, Md Abdul Wahab, Mohammad Rezaul Karim, Brian Yuliarto, Md Shahriar Hossain, Yusuke Yamauchi, Yusuf Valentino Kaneti
Summary: This work presents a template- and etching-free approach to fabricate hollow bimetallic nickel-cobalt benzenetricarboxylic acid hexagonal nanoplates. These nanoplates exhibit high sensitivity and stability in the sensing of ammonia, and have faster adsorption rates compared to other nano materials. The hollow two-dimensional structure and bimetallic composition present in these nanoplates contribute to their excellent sensing performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Deuk-Yong Shim, Sang-Mok Chang, Jong Min Kim
Summary: A surface molecular imprinting technique was applied to fabricate a porous aromatic gas sensing structure on a quartz crystal chip. The obtained film showed high sensitivity and selectivity for detecting toluene and phenol gases, with explanation based on the nature of the film components and the surface molecular imprint effect. The sub-minute level reset time was typically achieved in these measurements.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Jieun Son, Seulki Ji, Sungho Kim, Soyoung Kim, Seong K. Kim, Wooseok Song, Sun Sook Lee, Jongsun Lim, Ki-Seok An, Sung Myung
Summary: A highly facile method utilizing microcolumns integrated on a QCM gas-responsive system with enhanced chemical selectivity was reported for sensing and identifying volatile organic compound single gases. The addition of microcolumns on the QCM electrode increased the ability to accurately analyze frequency shifts upon sensing various single gas molecules. The system exhibited high detection response values above 50 ng/cm(2) for gases, with the microcolumn-equipped sensor showing improved gas identification ability based on distinct diverging behavior of time constants upon detection of different gases.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Di Jiang, Xiaona Zhao, Yi-Nan Liu, Hai-Bo Chen, Wen-Li Lv, Chen Qian, Xian-Wei Liu
Summary: The study introduces a label-free optical imaging technology that can detect molecule binding kinetics by tracking charge-sensitive variations in the oscillation amplitude with sub-nanometer precision, allowing for the measurement of small molecules and metal ions binding to the surface as well as protein-protein binding kinetics. This capability offers a promising platform for screening small-molecule drugs, probing conformational changes in proteins, and detecting environmental pollutants.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Philipp Ortner, Maren Umlandt, Nino Lomadze, Svetlana Santer, Marek Bekir
Summary: The quartz crystal microbalance with dissipation (QCM-D) has been widely used for investigating the external stimuli responsiveness at solid-liquid interfaces. However, in light responsive adsorption investigation, the quartz crystal itself reacts to optical stimulation, which poses challenges in data interpretation. This article introduces a simple guideline for correcting the measurement artifacts and minimizing the impact of light induced detuning (LID).
ANALYTICAL CHEMISTRY
(2023)
