Article
Chemistry, Multidisciplinary
Kissan Mistry, Viet Huong Nguyen, Mohamed Arabi, Khaled H. Ibrahim, Hatameh Asgarimoghaddam, Mustafa Yavuz, David Munoz-Rojas, Eihab Abdel-Rahman, Kevin P. Musselman
Summary: This article presents a resonant microcantilever sensor made from a zinc oxide thin film, which achieves ultrahigh sensitivity and self-actuation by changing the material and structural parameters, suitable for detecting low humidity levels.
Article
Chemistry, Physical
Guanglu Lei, Zishuo Li, Guocai Lu, Jinyuan Hu, Haochuan Shang, Xiaolei Zhang, Xianghong Liu, Jun Zhang, Xiangxin Guo
Summary: Metal oxide semiconductor (MOS) thin films, especially tungsten oxide (WO3) thin films, have shown great potential as sensing layers for gas sensor devices. This study focuses on the deposition and annealing process of WO3 thin films on interdigital electrodes, and explores the impact of oxygen vacancies on sensor properties. The results indicate that the WO3 sensor annealed at 500 degrees C exhibits the best performance in detecting triethylamine (TEA), which is attributed to the enhanced adsorption of oxidative oxygen species due to the presence of abundant oxygen vacancies.
JOURNAL OF MATERIOMICS
(2022)
Article
Engineering, Electrical & Electronic
Ben Xu, Yun Guo, Xingchao Ma, Yingfang Zhang, Chun-Liu Zhao, D. N. Wang
Summary: A tip Michelson interferometer (MI) is proposed and experimentally demonstrated for relative humidity (RH) sensing. The device consists of a short capillary tube with a small inner diameter that is spliced to a single-mode fiber (SMF) and coated with agarose gel on its end face, and the solid capillary wall and gel act as the sensing arm of the MI. The relationship between the structural parameters and the performance of the device is revealed, and the maximum sensitivity of 0.752 nm/% RH with a linear correlation coefficient of 0.9927 within the range of 25%-90% RH is obtained. The proposed sensor exhibits good performances of robustness, compact size, high repeatability, fast response (<100 ms), and small measurement uncertainty (<0.21% RH), making it promising for accurate static or dynamic moisture measuring.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Artem S. Mokrushin, Nikita A. Fisenko, Philipp Yu Gorobtsov, Tatiana L. Simonenko, Oleg Glumov, Natalia A. Melnikova, Nikolay P. Simonenko, Kirill A. Bukunov, Elizaveta P. Simonenko, Vladimir G. Sevastyanov, Nikolay T. Kuznetsov
Summary: ITO thin films were successfully produced on various substrates using a functional ink solution. The films exhibited a bixbyite structure, with an average particle size of 20 nm and a band gap of 3.57 eV. Gas-sensitive properties, particularly towards carbon monoxide, were studied, with potential models proposed to describe the sensory response. Mechanisms of defect formation and CO detection in humid environments were also considered.
Article
Engineering, Multidisciplinary
Ru-Lei Xia, Juan Liu, Jiulin Shi, Xing-Dao He, Jinhui Yuan, Andrew R. Pike, Liang Chu, Qiang Wu, Bin Liu
Summary: A fiber-optic Fabry-Perot-based humidity sensor using PNIPAM hydrogel to form a FP cavity was proposed and investigated. The sensor showed good sensitivity and repeatability, and could effectively monitor humidity with fast response and recovery.
Article
Materials Science, Ceramics
Sagnik Das, Md Lutfor Rahman, Partha P. Mondal, Preeti L. Mahapatra, Debdulal Saha
Summary: This paper presents an excellent humidity sensor based on screen-printed magnesium aluminate porous semi-thick film, showing high and stable response, fast recovery times, excellent repeatability, and long-term stability for commercial applications in various industries.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Youngbo Choi, Yoonseung Lee, Surin Hong
Summary: Trace amounts of volatile organic compounds (VOCs) were detected in Au chip interfaces modified with mesoporous SiO2 nanomaterials using a surface plasmon resonance (SPR) technique. The sensors modified with specific ligands showed high sensitivity and selectivity to the target gas molecules.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
Yanbing Xue, Bingjie Hou, Shuai Wang, Yumeng Shang, Baojun Chen, Yanjie Ju
Summary: In this paper, a highly sensitive paper-based humidity sensor is designed and fabricated using a toroidal inductor-interdigitated electrodes (IDE) capacitor as the resonator structure. The structural parameters of the sensor are optimized to improve the quality factor. Experimental results show that the copper-coated-paper-based sensor has better sensitivity compared to the other two paper-based sensors. Furthermore, graphene oxide (GO) films prepared using the spray method on the surface of the copper-coated-paper-based sensor significantly improve sensor sensitivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Foqia Shafiq, Rupak Wasman Qadir, Karwan Wasman Qadir, Qayyum Zafar
Summary: This study presents a new type of capacitive humidity sensor with surface-type electrode geometry. The high sensitivity and bandwidth of this planar-type humidity sensor (Al/PCPDTBT/Al) enable the easy and reliable estimation of ambient humidity. The use of a polymer sensing material with hierarchical nanoporous surface morphology ensures the stable performance of the sensor and rapid response to humidity changes. The operating mechanism of the sensor relies on the increase in the dielectric constant of the sensing layer with the rise in ambient humidity levels. Furthermore, the sensor exhibits enhanced bandwidth and improved capacitive and resistive sensitivity.
Article
Chemistry, Multidisciplinary
Vivek Adepu, Naveen Bokka, Venkat Mattela, Parikshit Sahatiya
Summary: This study presents the utilization of ReS2 on cellulose paper as a humidity sensor, demonstrating enhanced sensitivity, quicker response time, and improved long-term stability. Additionally, the sensor can be used for real-time applications such as respiration sensing, estimating skin conditions, and monitoring diaper wetting, showing promising applications in non-invasive healthcare and wearable electronics.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Zuocai Zhang, Tianyun Lu, Dan Yang, Shaorong Lu, Ren Cai, Weihong Tan
Summary: A low-cost and flexible biofilm humidity sensor with good wet strength has been developed in this study for humidity detection. The biofilm, named MC film, exhibits excellent wet strength and rapid humidity response after cross-linking with citric acid. It can be used over a wide temperature range with excellent durability and reversibility for humidity detection, making it suitable for various applications including personalized breath health monitoring.
Article
Chemistry, Analytical
Shuguo Yu, Chu Chen, Peng Li, Hongyan Zhang, Haiyang Zhang
Summary: A highly sensitive and stable Ti3C2Tx MXenes-RGO humidity sensor was developed for real-time respiratory monitoring. The sensor exhibits high sensitivity, low humidity hysteresis, short response/recovery time, and good stability and repeatability.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Engineering, Environmental
Xingzhe Zhang, Duo He, Qiang Yang, Massood Z. Atashbar
Summary: In this study, a new strategy to fabricate humidity sensors based on porous paper was reported. The sensors exhibited high sensitivity, quick response/recovery, high repeatability, and good stability. They were also highly foldable and twistable. Compared to previous humidity sensors, these sensors showed higher sensitivity and unique features, making them suitable for various applications including humidity sensing, breath detection, proximity detection, and non-touch switch.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Z. He, G. Zhou, Y. Oh, B. -M. Jung, M. -K. Um, S. -K. Lee, J. Il Song, J. -H. Byun, T. -W. Chou
Summary: In this study, we developed a compact and highly sensitive textile-based humidity sensor using SWNT/PVA/LiCl nanocomposite filaments. The sensor exhibited excellent stability and high sensitivity, and it could rapidly respond to humidity changes and human breathing. These performances make the sensor highly suitable for real-time microclimate monitoring on textiles.
MATERIALS TODAY NANO
(2022)
Article
Engineering, Electrical & Electronic
Xiang Yu, Xiangdong Chen, Xinglin Yu, Xinpeng Chen, Xing Ding, Xuan Zhao, Kung Tang
Summary: In this study, a Nafion/MoS2 hybrid thin film was developed for humidity detection, and it was found that the hybrid film exhibited a higher shift frequency compared to other sensors. This was attributed to the enhanced water channel formation ability of the composite film due to the dispersion of MoS2 nanosheets.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Review
Acoustics
Jose Joseph, Bo Ma, B. T. Khuri-Yakub
Summary: This article comprehensively reviews all the practical applications of CMUT up to now, providing detailed information on device properties and experimental details.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Engineering, Electrical & Electronic
Bo Ma, Kamyar Firouzi, Butrus T. Khuri-Yakub
Summary: This study introduces a novel multilayer masking technology for fabricating airborne CMUTs with multi-depth fluidic trenches, allowing for adjustable fractional bandwidth and receive sensitivity, as well as the fabrication of devices with different FBWs and sensitivities on the same wafer. The technology also demonstrates the ability to build MEMS with multi-depth micro/nanostructures.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2022)
Article
Acoustics
Ki Chang Kang, Young Hun Kim, Jeong Nyeon Kim, Minoo Kabir, Yichi Zhang, Pejman Ghanouni, Kwan Kyu Park, Kamyar Firouzi, Burtus T. Khuri-Yakub
Summary: A dual-mode conversion technique based on Lamb waves is proposed to improve the transmission efficiency of transcranial focused ultrasound (FUS) treatment. The concept was validated using finite element analysis and experiments, and it was found that oblique incidence exhibited better transmission efficiency than normal incidence for different materials.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Acoustics
Young Hun Kim, Ki Chang Kang, Jeong Nyeon Kim, Chi Nan Pai, Yichi Zhang, Pejman Ghanouni, Kwan Kyu Park, Kamyar Firouzi, Burtus T. Khuri-Yakub
Summary: Compared with conventional transcranial focused ultrasound stimulation methods, using a high-pressure gradient to generate compression and tensile forces can enhance stimulation. The study verifies a neuromodulation system using patterned interference radiation force and proposes a method to measure the magnitude of radiation force. Simulation results demonstrate the differences in radiation force generated by different methods.
ULTRASOUND IN MEDICINE AND BIOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Omar Ben Dali, Sergey Zhukov, Romol Chadda, Anatoli Kasanski, Heinz von Seggern, Xiaoqing Zhang, Gerhard Martin Sessler, Mario Kupnik
Summary: By replacing the environmentally harmful fluorinated polymer FEP with eco-friendly polylactic acid (PLA), a new manufacturing route is introduced to build an artificial ferroelectret sandwich. The PLA films show promising stability in terms of charge and piezoelectric activity. The easy assembled eco-friendly sensors demonstrate potential applications in force myography with high classification accuracy.
IEEE SENSORS JOURNAL
(2023)
Article
Multidisciplinary Sciences
Keith R. Murphy, Jordan S. Farrell, Juan L. Gomez, Quintin G. Stedman, Ningrui Li, Steven A. Leung, Cameron H. Good, Zhihai Qiu, Kamyar Firouzi, Kim Butts Pauly, Butrus Pierre T. Khuri-Yakub, Michael Michaelides, Ivan Soltesz, Luis de Lecea
Summary: We developed a system that can monitor the neural activity of specific cell types in the deep brain using focused ultrasound. By selectively adjusting the parameters, we were able to increase the activity of inhibitory neurons while suppressing the activity of excitatory neurons. This inhibitory effect was confirmed to be localized in the hippocampus through metabolic imaging.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Chemistry, Analytical
Joo Young Pyun, Young Hun Kim, Kwan Kyu Park
Summary: In this study, an analysis is conducted on the structure, exterior material, and active material of underwater transducers. By classifying transducers by structure, design trends and issues are identified, and a methodology to overcome the problem is presented. This review serves as a reference for underwater transducer designers.
Article
Chemistry, Multidisciplinary
Satoshi Honda, Minami Oka, Kazuki Fuke, Pierre T. T. Khuri-Yakub, Chi Nan Pai
Summary: Advances in vat photopolymerization (VP) 3D printing (3DP) technology have allowed for the production of precise 3D objects. This study reports on the fabrication of light- and high-intensity focused ultrasound (HIFU)-responsive cross-linked polymeric materials using VP-3DP. The compatibility between the photochemistry of HABI and photopolymerization allows for the introduction of reversible cross-links derived from HABIs in the resulting 3D-printed objects, enabling dynamic functionalities.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fareeha Safir, Nhat Vu, Loza F. Tadesse, Kamyar Firouzi, Niaz Banaei, Stefanie S. Jeffrey, Amr. A. E. Saleh, Butrus (Pierre) T. Khuri-Yakub, Jennifer A. Dionne
Summary: Developed an acoustic bioprinter to digitize samples into droplets, which can be detected with SERS and ML techniques for rapid and sensitive pathogen detection. The combined bioprinting and SERS platform has significant applications in clinical, environmental, and industrial settings for pathogen detection.
Article
Engineering, Biomedical
Young Hun Kim, Chang Hoon Lee, Kamyar Firouzi, Beom Hoon Park, Joo Young Pyun, Jeong Nyeon Kim, Kwan Kyu Park, Butrus T. Khuri-Yakub
Summary: This study compares the abilities of three commonly used acoustic radiation force equations to predict mechanical stress in brain tissue. The results show that only the Reynolds stress force equation accurately predicts the strong mechanical stress generated at the focal point. This has important implications for analyzing mechanical stress in ultrasound neuromodulation.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Chemistry, Analytical
Beom Hoon Park, Han Bin Choi, Hee-Seon Seo, Yub Je, Hak Yi, Kwan Kyu Park
Summary: In this study, a smart skin that avoids detection by SONAR via controlling the reflected signal from an unmanned underwater vehicle (UUV) is proposed. The smart skin is a multilayer transducer composed of an acoustic window, a double-layer receiver, and a single-layer transmitter. It separates the incident signal from the reflected signal and cancels the reflected wave by using the time-delay separation method and phase-shifted transmission sound. The stealth effect achieved by applying the smart skin to a UUV is demonstrated through active reflection-control omnidirectional reflection model.
Proceedings Paper
Acoustics
Hae Youn Kim, Dong-Hyun Kang, Shyinyong Shim, Jung-mok Seo, Butrus T. Khuri-Yakub, Byung Chul Lee
Summary: This paper introduces a nano-silicon-spring-embedded CMUT that improves energy transduction efficiency and achieves giant pressure output at low voltage. This technology can be used for the design of portable and wearable ultrasound devices.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Proceedings Paper
Acoustics
Young Hun Kim, Jeong Nyeon Kim, Kwan Kyu Park, Kamyar Firouzi, Butrus T. Khuri-Yakub
Summary: This study presents an optimization method to improve the resolution of mechanical stresses in ultrasound neuromodulation by calculating arbitrary input pressures. The optimized result was verified through numerical simulation, showing the possibility of generating a single compressive or tensile stress at a specific location within the tissue.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Article
Polymer Science
Atieh Razavi, Matthias Rutsch, Sonja Wismath, Mario Kupnik, Regine von Klitzing, Amin Rahimzadeh
Summary: This study investigates the use of high-frequency ultrasound to stimulate PNIPAM microgels and break the hydrogen bonds between water molecules. The absorption of ultrasound energy leads to the collapse of microgels and an increase in solution turbidity. The increase in solution concentration and ultrasound frequency accelerates the evolution of turbidity.
