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Yuan Y, Yang T, Chen X, Yu L, Hou X, Zhang G, Dong W, Lu Z, Li H, Reindl L, Luo W. Analysis of the acoustoelectric response of SAW gas sensors using a COM model. MICROSYSTEMS & NANOENGINEERING 2024; 10:69. [PMID: 38799402 PMCID: PMC11126560 DOI: 10.1038/s41378-024-00673-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/25/2024] [Accepted: 02/04/2024] [Indexed: 05/29/2024]
Abstract
Surface acoustic wave (SAW) gas sensors based on the acoustoelectric effect exhibit wide application prospects for in situ gas detection. However, establishing accurate models for calculating the scattering parameters of SAW gas sensors remains a challenge. Here, we present a coupling of modes (COM) model that includes the acoustoelectric effect and specifically explains the nonmonotonic variation in the center frequency with respect to the sensing film's sheet conductivity. Several sensing parameters of the gas sensors, including the center frequency, insertion loss, and phase, were experimentally compared for accuracy and practicality. Finally, the frequency of the phase extremum (FPE) shift was determined to vary monotonically, and the range of selectable test points was wide, making the FPE an appropriate response parameter for leveraging in SAW gas sensors. The simulation results of the COM model were highly consistent with the experimental results. Our study is proposed to provide theoretical guidance for the future development of gas SAW sensors.
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Affiliation(s)
- Yang Yuan
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Tao Yang
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Xi Chen
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Linglang Yu
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Xiaoxiao Hou
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Guangzu Zhang
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Wen Dong
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
| | - Zixiao Lu
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, People’s Republic of China
| | - Honglang Li
- CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, 100190 Beijing, People’s Republic of China
| | - Leonhard Reindl
- Department of Microsystems Engineering, Laboratory for Electrical Instrumentation and Embedded Systems, University of Freiburg, 79110 Freiburg, Germany
| | - Wei Luo
- School of Integrated Circuits, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China
- Research Institute of Huazhong University of Science and Technology in Shenzhen, 518057 Shenzhen, People’s Republic of China
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Kato T, Tanaka T, Uchida K. Detection of PPB-Level H 2S Concentrations in Exhaled Breath Using Au Nanosheet Sensors with Small Variability, High Selectivity, and Long-Term Stability. ACS Sens 2024; 9:708-716. [PMID: 38336360 PMCID: PMC10898455 DOI: 10.1021/acssensors.3c01944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 12/13/2023] [Accepted: 12/18/2023] [Indexed: 02/12/2024]
Abstract
The continuous monitoring of hydrogen sulfide (H2S) in exhaled breath enables the detection of health issues such as halitosis and gastrointestinal problems. However, H2S sensors with high selectivity and parts per billion-level detection capability, which are essential for breath analysis, and facile fabrication processes for their integration with other devices are lacking. In this study, we demonstrated Au nanosheet H2S sensors with high selectivity, ppb-level detection capability, and high uniformity by optimizing their fabrication processes: (1) insertion of titanium nitride (TiN) as an adhesion layer to prevent Au agglomeration on the oxide substrate and (2) N2 annealing to improve nanosheet crystallinity. The fabricated Au nanosheets successfully detected H2S at concentrations as low as 5.6 ppb, and the estimated limit of detection was 0.5 ppb, which is superior to that of the human nose (8-13 ppb). In addition, the sensors detected H2S in the exhaled breath of simulated patients at concentrations as low as 175 ppb while showing high selectivity against interfering molecules, such as H2, alcohols, and humidity. Since Au nanosheets with uniform sensor characteristics enable easy device integration, the proposed sensor will be useful for facile health checkups based on breath analysis upon its integration into mobile devices.
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Affiliation(s)
- Taro Kato
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Takahisa Tanaka
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Ken Uchida
- Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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Wang Y, Yan C, Liang C, Liu Y, Li H, Zhang C, Duan X, Pan Y. Sensitive Materials Used in Surface Acoustic Wave Gas Sensors for Detecting Sulfur-Containing Compounds. Polymers (Basel) 2024; 16:457. [PMID: 38399835 PMCID: PMC10892976 DOI: 10.3390/polym16040457] [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: 01/03/2024] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024] Open
Abstract
There have been many studies on surface acoustic wave (SAW) sensors for detecting sulfur-containing toxic or harmful gases. This paper aims to give an overview of the current state of polymer films used in SAW sensors for detecting deleterious gases. By covering most of the important polymer materials, the structures and types of polymers are summarized, and a variety of devices with different frequencies, such as delay lines and array sensors for detecting mustard gas, hydrogen sulfide, and sulfur dioxide, are introduced. The preparation method of polymer films, the sensitivity of the SAW gas sensor, the limit of detection, the influence of temperature and humidity, and the anti-interference ability are discussed in detail. The advantages and disadvantages of the films are analyzed, and the potential application of polymer films in the future is also forecasted.
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Affiliation(s)
- Yuhang Wang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; (Y.W.); (Y.L.); (H.L.); (X.D.)
| | - Cancan Yan
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China;
| | - Chenlong Liang
- Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ying Liu
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; (Y.W.); (Y.L.); (H.L.); (X.D.)
| | - Haoyang Li
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; (Y.W.); (Y.L.); (H.L.); (X.D.)
| | - Caihong Zhang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; (Y.W.); (Y.L.); (H.L.); (X.D.)
| | - Xine Duan
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; (Y.W.); (Y.L.); (H.L.); (X.D.)
| | - Yong Pan
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China;
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Kafuti YS, Zeng S, Liu X, Han J, Qian M, Chen Q, Wang J, Peng X, Yoon J, Li H. Observing hydrogen sulfide in the endoplasmic reticulum of cancer cells and zebrafish by using an activity-based fluorescent probe. Chem Commun (Camb) 2023; 59:2493-2496. [PMID: 36752717 DOI: 10.1039/d2cc06645a] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A crucial endogenous signaling chemical, hydrogen sulfide, is involved in many physiological actions. In this work, we created the fluorescent probe ER-Nap-NBD using a naphthalimide fluorophore as the signal reporter, a 7-nitro-1,2,3-benzoxadiazole amine as the responsive moiety, and a sulfonamide part for endoplasmic reticulum targeting. ER-Nap-NBD could be detected the H2S levels in solution and in living systems (cells and zebrafish).
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Affiliation(s)
- Yves S Kafuti
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China. .,School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Shuang Zeng
- School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Xiaosheng Liu
- School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Jingjing Han
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea. .,Department of Biosystems Science and Engineering, ETH Zurich, Mattenstrasse 26, CH-4058, Basel, Switzerland
| | - Ming Qian
- School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Qixian Chen
- School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Jingyun Wang
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China. .,School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China.
| | - Juyoung Yoon
- Department of Chemistry and Nanoscience, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea.
| | - Haidong Li
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China. .,School of Bioengineering, Dalian University of Technology, 2 Linggong Road, 116024, Dalian, Liaoning, China
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Degradation of Sub-Micrometer Sensitive Polymer Layers of Acoustic Sensors Exposed to Chlorpyrifos Water-Solution. SENSORS 2022; 22:s22031203. [PMID: 35161948 PMCID: PMC8840410 DOI: 10.3390/s22031203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 11/20/2022]
Abstract
The detection of organophosphates, a wide class of pesticides, in water-solution has a huge impact in environmental monitoring. Acoustic transducers are used to design passive wireless sensors for the direct detection of pesticides in water-solution by using tailored polymers as sensitive layers. We demonstrate by combining analytical chemistry tools that organophosphate molecules strongly alter polymer layers widely used in acoustic sensors in the presence of water. This chemical degradation can limit the use of these polymers in detection of organophosphates in water-solution.
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Abstract
The continuously rising interest in chemical sensors’ applications in environmental monitoring, for soil analysis in particular, is owed to the sufficient sensitivity and selectivity of these analytical devices, their low costs, their simple measurement setups, and the possibility to perform online and in-field analyses with them. In this review the recent advances in chemical sensors for soil analysis are summarized. The working principles of chemical sensors involved in soil analysis; their benefits and drawbacks; and select applications of both the single selective sensors and multisensor systems for assessments of main plant nutrition components, pollutants, and other important soil parameters (pH, moisture content, salinity, exhaled gases, etc.) of the past two decades with a focus on the last 5 years (from 2017 to 2021) are overviewed.
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Wang C, Ding Y, Li M, Li H, Xu S, Li C, Qian L, Yang B. Surface acoustic wave sensor based on Au/TiO 2/PEDOT with dual response to carbon dioxide and humidity. Anal Chim Acta 2022; 1190:339264. [PMID: 34857144 DOI: 10.1016/j.aca.2021.339264] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/30/2021] [Accepted: 11/07/2021] [Indexed: 02/08/2023]
Abstract
A surface acoustic wave (SAW) gas sensor with an Au/TiO2/poly(3,4-ethylenedioxythiophene) (PEDOT, which is a conductive polymer with photoelectric conversion function) sensing film was constructed for the quantitative detection of water vapor and CO2. The Au/TiO2/PEDOT sensing film was assembled on the delayed region of the 204 MHz SAW delay line, which was used as the base device for the gas sensor. The center frequency of the sensor decreases with an increase in relative humidity (RH), and the center frequency increases with increasing CO2 concentration, so that not only can the two gases be identified, but quantitative analysis can also be performed. The SAW sensor has a response range of 5%-90% for RH and a response range of 500-2000 ppm for CO2 gas. The shifts in center frequency varied linearly with the concentrations, giving rise to the sensitivities of -0.0068 and -0.1880 kHz %-1 for RH and ∼0.003 kHz ppm-1 CO2. The response/recovery time is 9 s/9.2 s for 700 ppm CO2 and 15 s/14 s for 70% RH. The experimental results show that the SAW sensor offers excellent selectivity, wide response range, rapid response, and good stability and repeatability. The mechanism of humidity and CO2 sensing is attributed to the hydrophilic porous structure of the Au/TiO2/PEDOT sensing film, and also to the reversible variation of its viscoelasticity under illumination conditions. The sensor, combined with the communication function of its own SAW device, has several prospective applications in the monitoring of atmospheric conditions.
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Affiliation(s)
- Chenchen Wang
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China
| | - Yanhong Ding
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China.
| | - Mingji Li
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China.
| | - Hongji Li
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory of Drug Targeting and Bioimaging, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, PR China.
| | - Sheng Xu
- School of Software and Communication, Tianjin Sino-German University of Applied Sciences, Tianjin, 300350, PR China
| | - Cuiping Li
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China
| | - Lirong Qian
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China
| | - Baohe Yang
- Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education), School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China
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8
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Guo Y, Zhou J, Ji Z, Liu Y, Cao R, Zhuo F, Tan K, Duan H, Fu Y. A new strategy to minimize humidity influences on acoustic wave ultraviolet sensors using ZnO nanowires wrapped with hydrophobic silica nanoparticles. MICROSYSTEMS & NANOENGINEERING 2022; 8:121. [PMID: 36407888 PMCID: PMC9666537 DOI: 10.1038/s41378-022-00455-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 08/05/2022] [Accepted: 09/06/2022] [Indexed: 05/12/2023]
Abstract
Surface acoustic wave (SAW) technology has been widely developed for ultraviolet (UV) detection due to its advantages of miniaturization, portability, potential to be integrated with microelectronics, and passive/wireless capabilities. To enhance UV sensitivity, nanowires (NWs), such as ZnO, are often applied to enhance SAW-based UV detection due to their highly porous and interconnected 3D network structures and good UV sensitivity. However, ZnO NWs are normally hydrophilic, and thus, changes in environmental parameters such as humidity will significantly influence the detection precision and sensitivity of SAW-based UV sensors. To solve this issue, in this work, we proposed a new strategy using ZnO NWs wrapped with hydrophobic silica nanoparticles as the effective sensing layer. Analysis of the distribution and chemical bonds of these hydrophobic silica nanoparticles showed that numerous C-F bonds (which are hydrophobic) were found on the surface of the sensitive layer, which effectively blocked the adsorption of water molecules onto the ZnO NWs. This new sensing layer design minimizes the influence of humidity on the ZnO NW-based UV sensor within the relative humidity range of 10-70%. The sensor showed a UV sensitivity of 9.53 ppm (mW/cm2)-1, with high linearity (R 2 value of 0.99904), small hysteresis (<1.65%) and good repeatability. This work solves the long-term dilemma of ZnO NW-based sensors, which are often sensitive to humidity changes.
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Affiliation(s)
- Yihao Guo
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Jian Zhou
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Zhangbin Ji
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Yanghui Liu
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Rongtao Cao
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Fengling Zhuo
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Kaitao Tan
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Huigao Duan
- College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China
| | - Yongqing Fu
- Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, UK
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Dodd LJ, Omar Ö, Wu X, Hasell T. Investigating the Role and Scope of Catalysts in Inverse Vulcanization. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05010] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Liam James Dodd
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
| | - Ömer Omar
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
| | - Xiaofeng Wu
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
- College of Chemistry and Chemical Engineering, Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials, Northwest Normal University, Lanzhou 730070, China
| | - Tom Hasell
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
- College of Chemistry and Chemical Engineering, Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials, Northwest Normal University, Lanzhou 730070, China
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Firmansyah T, Wibisono G, Rahardjo ET, Kondoh J. Multifunctional and Sensitivity Enhancement of Hybrid Acoustoplasmonic Sensors Fabricated on 36XY-LiTaO 3 with Gold Nanoparticles for the Detection of Permittivity, Conductivity, and the Refractive Index. ACS APPLIED MATERIALS & INTERFACES 2021; 13:13822-13837. [PMID: 33720686 DOI: 10.1021/acsami.1c00110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Integration of high-sensitivity sensors with multiple sensing performance for the environmental detection of permittivity (εr), conductivity (σ), and the refractive index (n) is required to support Societies 5.0. However, there are still many sensors with low sensitivity that stand alone. A shear-horizontal surface acoustic wave (SH-SAW) sensor is usually used because of its high-sensitivity performance in detecting electrical properties. Moreover, localized surface plasmon resonance (LSPR) sensors show remarkable optical side capability. Here, we have successfully combined these advantages with an additional benefit of sensitivity enhancement. We propose a hybrid acoustoplasmonic sensor generated by integrating SH-SAW and LSPR devices to simultaneously detect εr, σ, and n. The SH-SAW sensor was fabricated on a 36XY-LiTaO3 substrate using a developed interdigital transducer. Then, the LSPR sensor was implemented by the deposition of gold nanoparticles (AuNPs) on the propagation surfaces of the SH-SAW sensor. Fascinatingly, the AuNPs not only generate the LSPR effect but also enhance the SH-SAW sensor sensitivity. Comprehensive investigations were performed with atomic force microscopy imaging, CST software used for plasmonic E-field simulation, and hybrid sensing evaluation. Moreover, the SH-SAW sensitivity enhancement achieved using AuNPs was verified by frequency-domain and time-domain measurements. Thus, the SH-SAW sensor with AuNPs has a wide εr detection range (25-85), sensing capabilities for ultrasmall σ (0.00528-0.02504 S/m), and high sensitivity for n detection (45.5-201.9 nm/RIU). The cross-sectional effects were also evaluated. The effect of the LSPR device on the SH-SAW device was examined by turning the light OFF or ON (hereafter OFF/ON). The impact of the SH-SAW device on the LSPR device was investigated by turning the sine signal OFF/ON. We found that the SH-SAW sensor was not impacted by light. Interestingly, the presence of the SH-SAW sensor affects the positions of the AuNPs, which consistently generates a small blueshift in the LSPR effect. However, insignificant variation was noted in independent performances. In general, the SH-SAW sensor with AuNPs shows multifunctional independent characteristics and high-sensitivity performance, making it suitable for a chemical environment, with the possibility of integration with a wireless network.
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Affiliation(s)
- Teguh Firmansyah
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu-shi, Shizuoka 432-8561, Japan
- Department of Electrical Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok, West Java 16424, Indonesia
| | - Gunawan Wibisono
- Department of Electrical Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok, West Java 16424, Indonesia
| | - Eko Tjipto Rahardjo
- Department of Electrical Engineering, Universitas Indonesia, Kampus Baru UI Depok, Depok, West Java 16424, Indonesia
| | - Jun Kondoh
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu-shi, Shizuoka 432-8561, Japan
- Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-Ku, Hamamatsu-shi, Shizuoka 432-8561, Japan
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11
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Lu Y, Xu K, Yang MQ, Tang SY, Yang TY, Fujita Y, Honda S, Arie T, Akita S, Chueh YL, Takei K. Highly stable Pd/HNb 3O 8-based flexible humidity sensor for perdurable wireless wearable applications. NANOSCALE HORIZONS 2021; 6:260-270. [PMID: 33470262 DOI: 10.1039/d0nh00594k] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Real-time, daily health monitoring can provide large amounts of patient data, which may greatly improve the likelihood of diagnosing health conditions at an early stage. One potential sensor is a flexible humidity sensor to monitor moisture and humidity information such as dehydration. However, achieving a durable functional nanomaterial-based flexible humidity sensor remains a challenge due to partial desorption of water molecules during the recovery process, especially at high humidities. In this work, we demonstrate a highly stable resistive-type Pd/HNb3O8 humidity sensor, which exhibits a perdurable performance for over 100 h of cycle tests under a 90% relative humidity (RH) without significant performance degradation. One notable advantage of the Pd/HNb3O8 humidity sensor is its ability to regulate hydroniums due to the strong reducibility of H atoms dissociated on the Pd surface. This feature realizes a high stability even at a high humidity (99.9% RH). Using this superior performance, the Pd/HNb3O8 humidity sensor realizes wireless monitoring of the changes in the fingertip humidity of an adult under different physiological states, demonstrating a facile and reliable path for dehydration diagnosis.
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Affiliation(s)
- Yuyao Lu
- Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
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