Article
Physics, Applied
Zhikai Qiu, Yu Xia, Baiyun Wang, Yujie Hua, Weihan Li, Wenxuan Tang, Tie Jun Cui
Summary: This paper presents a microfluidic sensor using spiral resonators and plasmonic metamaterials, which can detect changes in electromagnetic response in real time and obtain material properties with low liquid consumption, high sensitivity, and low cost.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Chemistry, Analytical
Jose Luis Cano Perez, Jaime Gutierrez-Gutierrez, Christian Perezcampos Mayoral, Eduardo L. Perez-Campos, Maria del Socorro Pina Canseco, Lorenzo Tepech Carrillo, Laura Perez-Campos Mayoral, Marciano Vargas Trevino, Edmundo Lopez Apreza, Roberto Rojas Laguna
Summary: Fiber optic sensors have great potential in the biomedical field, with advantages of being smaller, easy to handle, non-invasive, high precision, and low-cost compared to other sensors. This review article compares different types of fiber optic sensors in glucose sensing, discussing their advantages and disadvantages in real applications.
Article
Chemistry, Analytical
Amir Hossein Omidvar, Atena Amanati Shahri, Ariana Lacorte Caniato Serrano, Jonas Gruber, Gustavo Pamplona Rehder
Summary: This article presents a novel, low-cost, and sensitive microwave microfluidic glucose detecting biosensor incorporating a molecularly imprinted polymer (MIP). The sensor shows high selectivity and sensitivity. Experimental results demonstrate the sensor's high sensitivity to variations in glucose absorption frequency, enabling the detection of low concentrations of glucose.
Article
Chemistry, Analytical
Nina Lokar, Borut Pecar, Matej Mozek, Danilo Vrtacnik
Summary: This study presents the development and characterization of a microfluidic electrochemical glucose biosensor. The biosensor uses thin-film metal electrodes on a glass substrate as the transducer part. The pyrroloquinoline quinone-glucose dehydrogenase (PQQ-GdhB) enzyme is selectively immobilized via microcontact printing on a gold working electrode, and the microfluidic part of the device is made of polydimethylsiloxane (PDMS) elastomer. The biosensor's electrode properties and response to glucose concentration and analyte flow rate were evaluated using cyclic voltammetry and chronoamperometry. The results showed a measurement range of up to 10 mM in glucose concentration and a detection limit of 30 μM.
Article
Engineering, Electrical & Electronic
Morteza Teymoori, Arda Deniz Yalcinkaya
Summary: The microfluidic field has developed paper-based devices that offer fast and cost-effective testing options, particularly for regions with limited access to healthcare centers and laboratories. However, most paper-based devices are qualitative or semi-quantitative, highlighting the need for quantitative transduction methods. This study introduces a microwave paper-based metamaterial-inspired transduction method that relies on dielectric sensing, offering potential applications in the biosensing field.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Analytical
Abbas Panahi, Ebrahim Ghafar-Zadeh
Summary: This paper presents a novel hybrid microfluidic electronic sensing platform, which integrates an electronic sensor with a microfluidic structure for life science applications. It introduces a mathematical model to describe the charge sensitivity of the sensor and validates the functionality and applicability of the sensing platform using experimental and simulation results.
Review
Chemistry, Analytical
Soojung Kim, Hyerin Song, Heesang Ahn, Taeyeon Kim, Jihyun Jung, Soo Kyung Cho, Dong-Myeong Shin, Jong-ryul Choi, Yoon-Hwae Hwang, Kyujung Kim
Summary: Electrical impedance biosensors combined with microfluidic devices offer high-throughput analysis of biological processes at the single-cell scale, enabling sensitive determination of drug effectiveness and toxicity. The efficiency and performance of the sensors are ultimately determined by the methods of single-cell trapping, while identifying the latest trends opens up opportunities for technological advancement. This leading technology in cell biology, pathology, and pharmacology allows for further understanding of complex cellular functions and mechanisms through precise analysis capabilities.
Article
Chemistry, Physical
G. Martinez-Saucedo, M. Ugalde-Reygadas, J. J. Alcantar Pena, G. Lastra-Medina, J. Marquez-Marin, G. Torres-Delgado, R. Castanedo-Perez, I. R. Chavez-Urbiola
Summary: The glucose sensitivity of a non-enzymatic sensor is affected by the thickness of the thin-film, which depends on the conductivity and roughness of the film. Copper oxide films grown by spray pyrolysis were used to study the effect of thin-film thickness. It was found that increasing the film thickness up to 434 nm improved the signal stability and sensitivity, but beyond that thickness, the sensitivity started to decrease gradually.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Analytical
Esma Dervisevic, Muamer Dervisevic, Bryan Ang, James Carthew, Kellie L. Tuck, Nicolas H. Voelcker, Victor J. Cadarso
Summary: Microbial contamination in cell culture is a common problem with limitations in traditional detection methods. This article presents a new microfluidic device that can monitor cell culture media acidity and cellular glucose metabolism to detect bacterial contamination. Using this device, bacterial contamination can be detected at stages where traditional methods fail, reducing the risk of undetected contamination and increasing experimental reliability.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Automation & Control Systems
Wen-Sheng Zhao, Bin-Xiao Wang, Da-Wei Wang, Bin You, Qi Liu, Gaofeng Wang
Summary: This article introduces a numerical optimization design of microfluidic channel route to improve sensor sensitivity, using particle-ant colony optimization algorithm and wolf colony algorithm. The developed methodology significantly increases the sensor sensitivity and shows good universality and automatic optimization ability for microwave microfluidic sensor design.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Serdar Tez, Metin Ak
Summary: In this study, conductive polymers (CPs) were coated on different MEMS lateral comb-drive resonator designs using an electrochemical polymerization technique for the first time in the literature. The integration of CPs with MEMS not only benefited the mechanical advantages of the lateral resonator but also utilized the optical, electrical, and functional properties of the CPs. The designed resonators were used to detect volatile organic compounds in open-air conditions, even in uncontrolled air conditions due to the differences in intermolecular interaction according to the polymer and VOCs structure.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Engineering, Biomedical
Sheng Zhang, Wenjie Zhao, Junyan Zeng, Zhaotao He, Xiang Wang, Zehui Zhu, Runqing Hu, Chen Liu, Qianqian Wang
Summary: The development of wearable non-invasive glucose sensors allows for convenient monitoring of diabetes patients' glucose concentration without discomfort and risk of infection. Metallic nanomaterials, with their good biocompatibility, large specific surface area, high catalytic activity, and strong adsorption capacity, are the optimal materials for these sensors. This review summarizes the metallic nanomaterials used in wearable non-invasive glucose sensors and their applications in glucose detection, as well as discussing the future development trends of these sensors.
MATERIALS TODAY BIO
(2023)
Article
Engineering, Electrical & Electronic
Bin-Xiao Wang, Wen-Sheng Zhao, Da-Wei Wang, Wen-Jing Wu, Qi Liu, Gaofeng Wang
Summary: In this paper, a numerical optimization is used to enhance the sensitivity of a differential microwave microfluidic sensor. The optimized sensor design with improved sensitivity was successfully tested with high sensitivity, validating the effectiveness of the optimization approach.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Analytical
Linda Yang, Zheng Zhang, Xin Wang
Summary: Paper-based microfluidic sensors have gained attention due to their self-driven nature, ease of preparation, high integration, low reagent consumption, and low cost. However, they have deficiencies when detecting certain detectors such as blood glucose. This study proposes a PET-based microfluidic sensor for glucose detection, which shows comparable analytical performance to commercial glucose meters.
Article
Biophysics
Mottour Vinayagam Chinnamani, Adeela Hanif, Padmanathan Karthick Kannan, Sandeep Kaushal, Muhammad Junaid Sultan, Nae-Eung Lee
Summary: In this study, a hollow microneedle (HMN) based on soft hollow microfibers and a microneedle-integrated microfluidic biosensor patch (MIMBP) capable of integrated blood sampling and electrochemical biosensing of biomolecules are proposed. The HMNs are fabricated by electroplating flexible and mechanically durable hollow microfibers made from a nanocomposite matrix. The MIMBP uses negative pressure to collect blood and deliver it to a flexible electrochemical biosensor modified with gold nanostructures and Pt nanoparticles. This platform has the potential to revolutionize personalized and decentralized healthcare.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Amir Ebrahimi, James Scott, Kamran Ghorbani
IEEE SENSORS JOURNAL
(2020)
Article
Chemistry, Analytical
Amir Ebrahimi, Grzegorz Beziuk, James Scott, Kamran Ghorbani
Article
Engineering, Electrical & Electronic
Amir Ebrahimi, Rajour Tanyi Ako, Wendy S. L. Lee, Madhu Bhaskaran, Sharath Sriram, Withawat Withayachumnankul
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2020)
Article
Chemistry, Analytical
Amir Ebrahimi, Francisco J. Tovar-Lopez, James Scott, Kamran Ghorbani
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Engineering, Electrical & Electronic
Sarah Masoumi, Thomas C. Baum, Amir Ebrahimi, Wayne S. T. Rowe, Kamran Ghorbani
Summary: This study presents a new technique to detect forest fires by investigating the plasma frequency generated from combusting plant material. The stable plasma frequency identified through this method opens up possibilities for forest fire detection.
IEEE SENSORS JOURNAL
(2021)
Article
Computer Science, Information Systems
Saeedeh Barzegar-Parizi, Amir Ebrahimi
Summary: This paper presents a theoretical analysis and design of a dual-narrowband terahertz absorber based on a hole array in a metallic slab, achieving very high quality factors at both resonance frequencies. Using a circuit model-based approach, absorption peaks at 2.46 and 3.75 THz frequencies with 98% and 96% absorptions at normal incidence were achieved. Quality factors of 149 and 144 were obtained for the two absorption bands at 50% absorbance.
Article
Engineering, Electrical & Electronic
Anh-Ngoc Nguyen, Viet Hoang Le, Nghia Nguyen-Trong, Mohsen Radfar, Amir Ebrahimi, Khoa Phan, Aniruddha Desai
Summary: The proposed single-layered slot antenna system operating at 5.8 GHz aims for in-band full duplex applications without the need for a coupler. High isolation is achieved by strong separation of even- and odd-mode feeds and the use of microstrip-coupled coplanar waveguides. The antenna system also boasts improved isolation with the inclusion of a lumped capacitor and has measured gains of 5.4 and 5.8 dBi at 5.8 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Analytical
Haneen Abdelwahab, Amir Ebrahimi, Francisco J. Tovar-Lopez, Grzegorz Beziuk, Kamran Ghorbani
Summary: This paper presents a highly sensitive microwave-based planar microfluidic sensor, achieving sensitivity enhancement by eliminating extra parasitic capacitance. The sensor is composed of a microstrip transmission line loaded with a resonator, with electric field distribution modified by microfluidic samples. The sensor's working principle is described through circuit model analysis, and experimental measurements validate the sensing mathematical model.
Article
Computer Science, Interdisciplinary Applications
Mousa Abdollahvand, Eduardo Martinez-de-Rioja, Keyvan Forooraghi, Zahra Atlasbaf, Jose Antonio Encinar, Saptarshi Ghosh, Amir Ebrahimi
Summary: This article proposes an active frequency selective surface (FSS) for satellite multi-band antennas in X and Ka bands. The FSS offers different frequency characteristics in different biasing states, allowing for selective operation in different frequency bands. The performance of the FSS has been analyzed using an equivalent circuit model, confirming its robust transmission response for different incidence angles.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Waseem Afzal, Amir Ebrahimi, Md. Rokunuzzaman Robel, Wayne S. T. Rowe
Summary: We propose a low-profile miniaturized-element frequency-selective surface (MEFSS) with narrowband, second-order bandpass response. The design includes a capacitive parallel LC unit cell for a narrowband bandpass response and five metallic layers FSS for a higher-order filtering response. The proposed design offers a thin profile and insensitivity to the polarization of the incident electromagnetic wave. A prototype of MEFSS with a second-order bandpass response at 3.34 GHz and a fractional bandwidth of 3.7% is designed, realized, and experimentally characterized.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Mousa Abdollahvand, Eduardo Martinez-de-Rioja, Jose A. Encinar, Kanishka Katoch, Amir Ebrahimi, Saptarshi Ghosh
Summary: This work proposes an active frequency selective surface (FSS) for multiband space antennas in X and Ka bands. The FSS provides reflection bands at 20 and 30 GHz (uplink and downlink frequencies of Ka-band satellites) and a switchable passband at 10 GHz. It consists of three metallic layers and four PIN diodes to control transmission and reflection in X band. The FSS has been studied using an equivalent circuit model and supports dual polarization with robust spectral response up to 30 degrees incidence angles.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)
Article
Computer Science, Information Systems
Pau Casacuberta, Paris Velez, Jonathan Munoz-Enano, Lijuan Su, Marta Gil Barba, Amir Ebrahimi, Ferran Martin
Summary: This paper presents a single-frequency reflective-mode phase-variation microwave sensor for dielectric characterization of materials. The sensor is implemented in coplanar waveguide technology and has high sensitivity and optimized operation frequency. By altering the capacitance of a step-impedance resonator, the sensor can detect the dielectric constant of a material under test.
Proceedings Paper
Engineering, Electrical & Electronic
Mousa Abdollahvand, Keyvan Forooraghi, Zahra Atlasbaf, Eduardo Martinez-de-Rioja, Jose A. Encinar, Amir Ebrahimi, Saptarshi Ghosh
Summary: This paper presents a reconfigurable frequency selective surface (FSS) for shared-aperture satellite antennas in X and Ka bands. It is designed to be reflective at 20 and 30 GHz in Ka-band and allow switching of transmission and reflection responses between 9 and 12 GHz in X-band. The FSS unit cell comprises a multi-layer structure and reconfigurability is achieved using four PIN diodes, providing stable performance for different polarizations under oblique incidence angles.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Article
Engineering, Electrical & Electronic
Paris Velez, Jonathan Munoz-Enano, Amir Ebrahimi, Cristian Herrojo, Ferran Paredes, James Scott, Kamran Ghorbani, Ferran Martin
Summary: A microfluidic sensor based on a composite resonator combining SIR and CSRR is reported, achieving high sensitivity by designing closely spaced pole and transmission zeros. The sensor is able to resolve volume fractions as small as 5% for isopropanol solutions, with a maximum measured sensitivity of 4 mV/%.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
