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Amers EL, Orme BV, Shi Y, Torun H, Dodd LE. Embroidered Interdigitated Electrodes (IDTs) with Wireless Readout for Continuous Biomarker Monitoring. SENSORS (BASEL, SWITZERLAND) 2024; 24:4643. [PMID: 39066041 PMCID: PMC11280827 DOI: 10.3390/s24144643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 07/04/2024] [Accepted: 07/12/2024] [Indexed: 07/28/2024]
Abstract
Non-invasive continuous health monitoring has become feasible with the advancement of biosensors. While monitoring certain biomarkers such as heart rate or skin temperature are now at a certain maturity, monitoring molecular biomarkers is still challenging. Progress has been shown in sampling, measurement, and interpretation of data toward non-invasive molecular sensors that can be integrated into daily wearable items. Toward this goal, this paper explores the potential of embroidered interdigitated transducer (IDT)-based sensors for non-invasive, continuous monitoring of human biomarkers, particularly glucose levels, in human sweat. The study employs innovative embroidery techniques to create flexible fabric-based sensors with gold-coated IDTs. In controlled experiments, we have shown the variation of glucose concentration in water can be wirelessly detected by tracking the resonant frequency of the embroidered sensors. The current sensors operate at 1.8 GHz to 2 GHz and respond to the change in glucose concentration with a sensitivity of 0.17 MHz/(mg/dL). The embroidered IDT-based sensors with wireless sensing will be a new measurement modality for molecular wearable sensors. The establishment of a wireless sensing mechanism for embroidered IDT-based sensors will be followed by an investigation of sweat for molecular detection. This will require adding functionalities for sampling and interpretation of acquired data. We envisage the embroidered IDT-based sensors offer a unique approach for seamless integration into clothing, paving the way for personalised, continuous health data capture.
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Affiliation(s)
- Emmy L. Amers
- Smart Materials & Surfaces Laboratory—E-Textiles Centre, Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK (H.T.)
| | - Bethany V. Orme
- Smart Materials & Surfaces Laboratory—E-Textiles Centre, Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK (H.T.)
| | - Yuyuan Shi
- Digital Textile Lab, School of Design, Faculty of Arts, Design and Social Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
| | - Hamdi Torun
- Smart Materials & Surfaces Laboratory—E-Textiles Centre, Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK (H.T.)
| | - Linzi E. Dodd
- Smart Materials & Surfaces Laboratory—E-Textiles Centre, Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK (H.T.)
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Ma Z, Fu M, Gao C, Fan S, Chi H, Li W, Hou D, Cao Y. Trenched microwave resonator integrated with porous PDMS for detection and classification of VOCs with enhanced performance. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134553. [PMID: 38735191 DOI: 10.1016/j.jhazmat.2024.134553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 04/26/2024] [Accepted: 05/04/2024] [Indexed: 05/14/2024]
Abstract
Microwave resonators combined with polymer absorption layers are widely used in volatile organic compound (VOC) detection based on their variable resonant frequencies. However, the response time is limited due to the polymer's slow volumetric absorption of VOC molecules. By constructing a porous structure in Polydimethylsiloxane (PDMS), resulting in reduced the response time to as short as 71.1%. To mitigate the sensitivity decline caused by the porous PDMS, a trenched-substrate complementary split-ring resonator (CSRR) is proposed for enhancing the interaction between the electromagnetic fields (EMFs) and the porous PDMS with VOCs. The removal of the substrate beneath CSRR's sensing region enhances the effective EMF, increasing frequency and amplitude sensitivities up to 175.5% and 137.8%, respectively. Responses to four common VOCs by the sensor show a maximum sensitivity of 217 Hz/ppm and a minimum limit of detection of 295 ppm. Additionally, resonant parameters and extracted lumped parameters are utilized to establish two decision-tree-based VOC classification models, achieving high accuracies of 98.71% and 99.59%, respectively. And the latter one fully utilizing responses throughout the swept band, proves superior in identifying similar substances. This sensor technology helps promote the sensitive detection and accurate classification of diverse VOCs.
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Affiliation(s)
- Zhiqiang Ma
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Mengyao Fu
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Chenyang Gao
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shuyu Fan
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Haozhen Chi
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Wei Li
- College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Dibo Hou
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yunqi Cao
- College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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Buttkewitz MA, Heuer C, Bahnemann J. Sensor integration into microfluidic systems: trends and challenges. Curr Opin Biotechnol 2023; 83:102978. [PMID: 37531802 DOI: 10.1016/j.copbio.2023.102978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 08/04/2023]
Abstract
The combination of sensors and microfluidics has become a promising approach for detecting a wide variety of targets relevant in biotechnology. Thanks to recent advances in the manufacturing of microfluidic systems, microfluidics can be manufactured faster, cheaper, and more accurately than ever before. These advances make microfluidic systems very appealing as a basis for constructing sensor systems, and microfluidic devices have been adapted to house (bio)sensors for various applications (e.g. protein biomarker detection, cell culture oxygen control, and pathogen detection). This review article highlights several successfully integrated microfluidic sensor systems, with a focus on work that has been published within the last two years. Different sensor integration methods are discussed, and the latest trends in wearable- and smartphone-based sensors are described.
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Affiliation(s)
- Marc A Buttkewitz
- Institute of Technical Chemistry, Leibniz University Hannover, 30167 Hannover, Germany
| | - Christopher Heuer
- Institute of Technical Chemistry, Leibniz University Hannover, 30167 Hannover, Germany; Institute of Physics, University of Augsburg, 86159 Augsburg, Germany
| | - Janina Bahnemann
- Institute of Physics, University of Augsburg, 86159 Augsburg, Germany; Centre for Advanced Analytics and Predictive Sciences (CAAPS), University of Augsburg, 86159 Augsburg, Germany.
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Javadizadeh S, Badieirostami M, Shahabadi M. Ultrasensitive miniaturized planar microwave sensor for characterization of water-alcohol mixtures. Sci Rep 2023; 13:14144. [PMID: 37644197 PMCID: PMC10465586 DOI: 10.1038/s41598-023-41035-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 08/21/2023] [Indexed: 08/31/2023] Open
Abstract
Designing a low-cost, compact, yet sensitive planar microwave sensor for complex permittivity measurement is highly desired for numerous applications though quite challenging. Here, in this research, an ultrasensitive planar microwave sensor is proposed which is based on an electric LC structure. The core sensor was fabricated on an FR-4 substrate using a simple fabrication process, then integrated within a polymethylmethacrylate microfluidic channel for straightforward liquid delivery to the sensing region. The resonance frequency of the bare sensor was designed to occur at 4.14 GHz while empty and shifted to 0.88 GHz when deionized water flows into the channel. The sensor response has been characterized for different mixture ratios of methanol and ethanol with deionized water. Next, the complex permittivity of the resulted binary mixtures has been extracted by the Debye model through a least square fitting method. The calculated average sensitivity is 1.45% which stands above most of sensors reported in the literature. Besides, the sensor has a small footprint with dimensions of 3.6 × 3.8 mm[Formula: see text] making it a suitable candidate for integration with point-of-care testing devices.
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Affiliation(s)
- Saeed Javadizadeh
- School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Majid Badieirostami
- School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran.
| | - Mahmoud Shahabadi
- School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Tripathy HP, Pattanaik P, Mishra DK, Kamilla SK, Holderbaum W. Experimental and probabilistic model validation of ultrasonic MEMS transceiver for blood glucose sensing. Sci Rep 2022; 12:21259. [PMID: 36481774 PMCID: PMC9732296 DOI: 10.1038/s41598-022-25717-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 12/05/2022] [Indexed: 12/13/2022] Open
Abstract
In contrast to traditional laboratory glucose monitoring, recent developments have focused on blood glucose self-monitoring and providing patients with a self-monitoring device. This paper proposes a system based on ultrasound principles for quantifying glucose levels in blood by conducting an in-vitro experiment with goat blood before human blood. The ultrasonic transceiver is powered by a frequency generator that operates at 40 kHz and 1.6 V, and variations in glucose level affect the ultrasonic transceiver readings. The RVM probabilistic model is used to determine the variation in glucose levels in a blood sample. Blood glucose levels are measured simultaneously using a commercial glucose metre for confirmation. The experimental data values proposed are highly correlated with commercial glucose metre readings. The proposed ultrasonic MEMS-based blood glucometer measures a glucose level of [Formula: see text] mg/dl. In the near future, the miniature version of the experimental model may be useful to human society.
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Affiliation(s)
- Hara Prasada Tripathy
- grid.412612.20000 0004 1760 9349Semiconductor Research Laboratory, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, 751030 India
| | - Priyabrata Pattanaik
- grid.412612.20000 0004 1760 9349Semiconductor Research Laboratory, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, 751030 India
| | - Dilip Kumar Mishra
- grid.412612.20000 0004 1760 9349Semiconductor Research Laboratory, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, 751030 India
| | - Sushanta Kumar Kamilla
- grid.412612.20000 0004 1760 9349Semiconductor Research Laboratory, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, 751030 India
| | - William Holderbaum
- grid.9435.b0000 0004 0457 9566School of Biological Science, Biomedical Engineering, University of Reading, Whiteknights, RG6 6AY UK
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Microfluidic microwave biosensor based on biomimetic materials for the quantitative detection of glucose. Sci Rep 2022; 12:15961. [PMID: 36153402 PMCID: PMC9509396 DOI: 10.1038/s41598-022-20285-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
This paper presents a microwave microfluidic biosensor for monitoring blood glucose levels. The glucose sensor is a triple ring microstrip patch antenna integrated with a biomimetic microfluidic device capable of measuring a fixed volume of glucose solution. The sensor was utilized to detect 50–500 mg/dL glucose solutions. The interaction of the glucose solution with the electromagnetic field on the patch's surface influences both the resonance frequency and the magnitude of reflection coefficient. The results indicate that the microfluidic device can reduce experimental error and enhance the correlation between glucose concentration, resonant frequency, and reflection coefficient. Finally, the microfluidic sensor had a sensitivity of 0.25 MHz/(mg/dL), a detection limit as low as 7.7 mg/dL, and correlation coefficients of resonance frequency and reflection coefficient with a glucose concentration of 0.996 and 0.984, respectively. The experiment on the sensor's stability verifies the sensor's excellent stability and rapid response (~ 150 ms). Consequently, the device can be used to differentiate the concentration of glucose solutions, as well as to detect blood glucose levels at an early stage.
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Kim Y, Salim A, Lim S. Millimeter-Wave-Based Spoof Localized Surface Plasmonic Resonator for Sensing Glucose Concentration. BIOSENSORS 2021; 11:358. [PMID: 34677314 PMCID: PMC8533816 DOI: 10.3390/bios11100358] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/24/2021] [Accepted: 09/25/2021] [Indexed: 12/25/2022]
Abstract
Glucose-monitoring sensors are necessary and have been extensively studied to prevent and control health problems caused by diabetes. Spoof localized surface plasmon (LSP) resonance sensors have been investigated for chemical sensing and biosensing. A spoof LSP has similar characteristics to an LSP in the microwave or terahertz frequency range but with certain advantages, such as a high-quality factor and improved sensitivity. In general, microwave spoof LSP resonator-based glucose sensors have been studied. In this study, a millimeter-wave-based spoof surface plasmonic resonator sensor is designed to measure glucose concentrations. The millimeter-wave-based sensor has a smaller chip size and higher sensitivity than microwave-frequency sensors. Therefore, the microfluidic channel was designed to be reusable and able to operate with a small sample volume. For alignment, a polydimethylsiloxane channel was simultaneously fabricated using a multilayer bonding film to attach the upper side of the pattern, which is concentrated in the electromagnetic field. This real-time sensor detects the glucose concentration via changes in the S11 parameter and operates at 28 GHz with an average sensitivity of 0.015669 dB/(mg/dL) within the 0-300 mg/dL range. The minimum detectable concentration and the distinguishable signal are 1 mg/dL and 0.015669 dB, respectively, from a 3.4 μL sample. The reusability and reproducibility were assessed through replicates.
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Affiliation(s)
| | | | - Sungjoon Lim
- School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea; (Y.K.); (A.S.)
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Microwave Planar Resonant Solutions for Glucose Concentration Sensing: A Systematic Review. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11157018] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The measurement of glucose concentration finds interesting potential applications in both industry and biomedical contexts. Among the proposed solutions, the use of microwave planar resonant sensors has led to remarkable scientific activity during the last years. These sensors rely on the changes in the dielectric properties of the medium due to variations in the glucose concentration. These devices show electrical responses dependent on the surrounding dielectric properties, and therefore the changes in their response can be related to variations in the glucose content. This work shows an up-to-date review of this sensing approach after more than one decade of research and development. The attempts involved are sorted by the sensing parameter, and the computation of a common relative sensitivity to glucose is proposed as general comparison tool. The manuscript also discusses the key points of each sensor category and the possible future lines and challenges of the sensing approach.
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Jang C, Lee HJ, Yook JG. Radio-Frequency Biosensors for Real-Time and Continuous Glucose Detection. SENSORS (BASEL, SWITZERLAND) 2021; 21:1843. [PMID: 33800771 PMCID: PMC7961512 DOI: 10.3390/s21051843] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/24/2021] [Accepted: 03/04/2021] [Indexed: 12/11/2022]
Abstract
This review paper focuses on radio-frequency (RF) biosensors for real-time and continuous glucose sensing reported in the literature, including our recent research. Diverse versions of glucose biosensors based on RF devices and circuits are briefly introduced, and their performances are compared. In addition, the limitations of the developed RF glucose biosensors are discussed. Finally, we present perspectives on state-of-art RF biosensing chips for point-of-care diagnosis and describe their future challenges.
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Affiliation(s)
- Chorom Jang
- Department of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea;
| | - Hee-Jo Lee
- Department of Physics Education, College of Education, Daegu University, Gyeongsan 38453, Korea;
| | - Jong-Gwan Yook
- Department of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Korea;
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Microfluidic Modules Integrated with Microwave Components-Overview of Applications from the Perspective of Different Manufacturing Technologies. SENSORS 2021; 21:s21051710. [PMID: 33801309 PMCID: PMC7958350 DOI: 10.3390/s21051710] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/05/2021] [Accepted: 02/25/2021] [Indexed: 12/14/2022]
Abstract
The constant increase in the number of microfluidic-microwave devices can be explained by various advantages, such as relatively easy integration of various microwave circuits in the device, which contains microfluidic components. To achieve the aforementioned solutions, four trends of manufacturing appear—manufacturing based on epoxy-glass laminates, polymer materials (mostly common in use are polydimethylsiloxane (PDMS) and polymethyl 2-methylpropenoate (PMMA)), glass/silicon substrates, and Low-Temperature Cofired Ceramics (LTCCs). Additionally, the domains of applications the microwave-microfluidic devices can be divided into three main fields—dielectric heating, microwave-based detection in microfluidic devices, and the reactors for microwave-enhanced chemistry. Such an approach allows heating or delivering the microwave power to the liquid in the microchannels, as well as the detection of its dielectric parameters. This article consists of a literature review of exemplary solutions that are based on the above-mentioned technologies with the possibilities, comparison, and exemplary applications based on each aforementioned technology.
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