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Environment-friendly surface acoustic wave humidity sensor with sodium alginate sensing layer. MICRO AND NANO ENGINEERING 2022. [DOI: 10.1016/j.mne.2022.100127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Khan MU, Hassan G, Shaukat RA, Saqib QM, Chougale MY, Kim J, Bae J. Wide range and highly linear signal processed systematic humidity sensor array using Methylene Blue and Graphene composite. Sci Rep 2021; 11:16665. [PMID: 34404831 PMCID: PMC8371138 DOI: 10.1038/s41598-021-95977-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 07/29/2021] [Indexed: 11/25/2022] Open
Abstract
This paper proposes a signal processed systematic 3 × 3 humidity sensor array with all range and highly linear humidity response based on different particles size composite inks and different interspaces of interdigital electrodes (IDEs). The fabricated sensors are patterned through a commercial inkjet printer and the composite of Methylene Blue and Graphene with three different particle sizes of bulk Graphene Flakes (BGF), Graphene Flakes (GF), and Graphene Quantum Dots (GQD), which are employed as an active layer using spin coating technique on three types of IDEs with different interspaces of 300, 200, and 100 µm. All range linear function (0–100% RH) is achieved by applying the linear combination method of nine sensors in the signal processing field, where weights for linear combination are required, which are estimated by the least square solution. The humidity sensing array shows a fast response time (Tres) of 0.2 s and recovery time (Trec) of 0.4 s. From the results, the proposed humidity sensor array opens a new gateway for a wide range of humidity sensing applications with a linear function.
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Affiliation(s)
- Muhammad Umair Khan
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea
| | - Gul Hassan
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea.,Centre for Advanced Electronics and Photovoltaic Engineering (CAEPE), International Islamic University, H-10, Islamabad, 44000, Pakistan
| | - Rayyan Ali Shaukat
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea
| | - Qazi Muhammad Saqib
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea
| | - Mahesh Y Chougale
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea
| | - Jungmin Kim
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea
| | - Jinho Bae
- Department of Ocean System Engineering, Jeju National University, 102 Jejudaehakro, Jeju, 63243, Korea.
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Sheng L, Dajing C, Yuquan C. A surface acoustic wave humidity sensor with high sensitivity based on electrospun MWCNT/Nafion nanofiber films. NANOTECHNOLOGY 2011; 22:265504. [PMID: 21576796 DOI: 10.1088/0957-4484/22/26/265504] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Humidity detection has been widely used in a variety of fields. A humidity sensor with high sensitivity is reported in this paper. A surface acoustic wave resonator (SAWR) with high resonance frequency was fabricated as a basic sensitive component. Various nanotechnologies were used to improve the sensor's performance. A multi-walled carbon nanotube/Nafion (MWCNT/Nafion) composite material was prepared as humidity-sensitive films, deposited on the surface of an SAWR by the electrospinning method. The electrospun MWCNT/Nafion nanofiber films showed a three-dimensional (3D) porous structure, which was profitable for improving the sensor's performance. The new nano-water-channel model of Nafion was also applied in the humidity sensing process. Compared to other research, the present sensor showed excellent sensitivity (above 400 kHz/% relative humidity (RH) in the range from 10% RH to 80% RH), good linearity (R(2) > 0.98) and a short response time (∼3 s@63%).
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Affiliation(s)
- Lei Sheng
- Department of Biomedical Engineering, Zhejiang University, Hangzhou, People's Republic of China.
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Wang X, Ding B, Yu J, Wang M, Pan F. A highly sensitive humidity sensor based on a nanofibrous membrane coated quartz crystal microbalance. NANOTECHNOLOGY 2010; 21:055502. [PMID: 20023313 DOI: 10.1088/0957-4484/21/5/055502] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel humidity sensor was fabricated by electrospinning deposition of nanofibrous polyelectrolyte membranes as sensitive coatings on a quartz crystal microbalance (QCM). The results of sensing experiments indicated that the response of the sensors increased by more than two orders of magnitude with increasing relative humidity (RH) from 6 to 95% at room temperature, exhibiting high sensitivity, and that, in the range of 20-95% RH, the Log(Deltaf) showed good linearity. The sensitivity of fibrous composite polyacrylic acid (PAA)/poly(vinyl alcohol) (PVA) membranes was two times higher than that of the corresponding flat films at 95% RH. Compared with fibrous PAA/PVA membranes, the nanofibrous PAA membranes exhibited remarkably enhanced humidity sensitivity due to their high PAA content and large specific surface area caused by the formation of ultrathin nanowebs among electrospun fibers. Additionally, the resultant sensors exhibited a good reversible behavior and good long term stability.
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Affiliation(s)
- Xianfeng Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
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