Humidity sensor based on unsymmetrical U-shaped microfiber with a polyvinyl alcohol overlay

Zhao, Yong; Peng, Yun; Chen, Mao-qing; Tong, Rui-jie

doi:10.1016/j.snb.2018.02.123

Cited by 64 publications

(13 citation statements)

References 29 publications

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“…In 2018, Zhao et al. proposed a novel horizontal coating method based on the dip coater, as shown in Figure 6c, which is very suitable for the coating of transmissive sensing probes [121] . It should be noted that the pull speed is a key parameter, too fast or too slow will affect the quality of the film.…”

Section: Functional Nanomaterials and Their Deposition Techniques For...mentioning

confidence: 99%

“…[78,117] Calcium alginate hydrogel, hydroxypropyl methylcellulose hydrogel, and polyvinyl alcohol (PVA) hydrogel can be used as humidity sensitive materials for optical fiber humidity sensors. [118][119][120][121] On the other hand, they can be used as matrix to encapsulate or immobilize specific chemicals, luminescent materials or biological receptors for biochemical detection. For example, the PVA/PAA hydrogel film chemically modified by 8-hydroxyquinoline (8HQ) is sensitive to Ni 2+ and can be used for the detection of Ni 2+ concentration in aqueous solution.…”

Section: Polymersmentioning

confidence: 99%

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Optical Fiber Optofluidic Bio‐Chemical Sensors: A Review

Zhang

Zhou

et al. 2021

Laser & Photonics Reviews

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Optofluidic, as an emerging technology that combines photons and microfluidics, has become a powerful, intelligent, and universal sensing platform in the field of bio-chemical sensing. Optical fiber optofluidic (OFOF), as a branch of optofluidic technology, has stimulated a host of remarkable achievements in the field of bio-chemical sensing due to its superiority of compact structure, immunity to electromagnetic interference, low sample consumption, high sensitivity, and real-time dynamic response. In this paper, an overview of OFOF bio-chemical sensors is presented. The OFOF system architectures are introduced and some advanced functional materials and coating technologies that can be utilized in the OFOF sensing platform to achieve high-performance biochemical sensing are summarized. Research progress and current status of OFOF bio-chemical sensors based on various sensing mechanisms are summarized and analyzed, with emphases on their sensing principles, sensing structures, sensing applications, advantages, and disadvantages. Lastly, the existing challenges and future development trends of OFOF biochemical sensors are briefly discussed.

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Section: Functional Nanomaterials and Their Deposition Techniques For...mentioning

confidence: 99%

Section: Polymersmentioning

confidence: 99%

Optical Fiber Optofluidic Bio‐Chemical Sensors: A Review

Zhang

Zhou

et al. 2021

Laser & Photonics Reviews

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“…However, the RH sensors utilizing optical detection methods show many advantages in terms of their anti-electromagnetic interference, mechanical robustness, small size, and high sensitivity [4,5]. Over the years, optical RH sensors have been successfully developed by coating various sensitive hygroscopic materials, such as agarose [6], polyimide (PI) [7], polymethyl methacrylate (PMMA) [4], and polyvinyl-alcohol (PVA) [2,[8][9][10]. In addition, different types of structures have also been designed to achieve humidity sensing, including the fiber-based Fabry-Pérot interferometer (FPI) [8,11], U-shaped microfiber [9], fiber Bragg gratings (FBG) [12], and SOI-based microcavities [2,4,10,13].…”

Section: Introductionmentioning

confidence: 99%

“…Over the years, optical RH sensors have been successfully developed by coating various sensitive hygroscopic materials, such as agarose [6], polyimide (PI) [7], polymethyl methacrylate (PMMA) [4], and polyvinyl-alcohol (PVA) [2,[8][9][10]. In addition, different types of structures have also been designed to achieve humidity sensing, including the fiber-based Fabry-Pérot interferometer (FPI) [8,11], U-shaped microfiber [9], fiber Bragg gratings (FBG) [12], and SOI-based microcavities [2,4,10,13]. However, in the age of chip-integrated circuits, existing all-fiber-based sensors cannot meet future needs due to CMOS incompatibility and fragility [4,14].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of Relative Humidity and Temperature Based on Silicon On-Chip Cascaded Photonic Crystal Nanobeam Cavities

Liu

Pei

et al. 2021

Crystals

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In this paper, we propose and numerically demonstrate a novel cascaded silicon-on-insulator (SOI) photonic crystal nanobeam cavity (PCNC) dual-parameter sensor for the simultaneous detection of relative humidity (RH) and temperature. The structure consists of two independent PCNCs supporting two different resonant modes: a dielectric-mode and an air-mode, respectively. The dielectric-mode nanobeam cavities (cav1) are covered with SU-8 cladding to increase the sensitivity ratio contrast between RH sensing and temperature sensing. The air-mode nanobeam cavities (cav2) are coated with a water-absorbing polyvinyl-alcohol (PVA) layer that converts the change in RH into a change in refractive index (RI) under different ambient RH levels, thereby inducing a wavelength shift. Due to the positive thermo-optic (TO) coefficient of silicon and the negative TO coefficient of SU-8 cladding, the wavelength responses take the form of a red shift for cav2 and a blue shift for cav1 as the ambient temperature increases. By using 3D finite-difference time-domain (3D-FDTD) simulations, we prove the feasibility of simultaneous sensing by monitoring a single output transmission spectrum and applying the sensor matrix. For cav1, the RH and temperature sensitivities are 0 pm/%RH and −37.9 pm/K, while those of cav2 are −389.2 pm/%RH and 58.6 pm/K. The sensitivity ratios of temperature and RH are −1.5 and 0, respectively, which is the reason for designing two different resonant modes and also implies great potential for realizing dual-parameter sensing detection. In particular, it is also noteworthy that we demonstrate the ability of the dual-parameter sensor to resist external interference by using the dual wavelength matrix method. The maximum RH and temperature detection errors caused by the deviation of resonance wavelength 1 pm are only 0.006% RH and 0.026 K, which indicates that it achieves an excellent anti-interference ability. Furthermore, the structure is very compact, occupying only 32 μm × 4 μm (length × width). Hence, the proposed sensor shows promising prospects for compact lab-on-chip integrated sensor arrays and sensing with multiple parameters.

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“…Refractive index (RI) [ 25 , 28 , 29 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], force [ 50 ], twist [ 27 , 51 ], vibration [ 52 ], and strain [ 53 ] have direct effect on the signal transmission of MFC waist region. By covering and well packaging the waist region with functional materials, monitoring of temperature [ 23 , 24 , 28 , 31 , 32 , 37 , 42 , 43 , 46 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ], humidity [ 31 , 57 , 61 , 62 , 63 , 64 , 65 , 66 ], magnetic field [ 30 , 67 , 68 , 69 ], flow velocity […”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

et al. 2020

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An optical fiber coupler is a simple and fundamental component for fiber optic technologies that works by reducing the fiber diameter to hundred nanometers or several micrometers. The microfiber coupler (MFC) has regained interest in optical fiber sensing in recent years. The subwavelength diameter rationales vast refractive index (RI) contrast between microfiber “core” and surrounding “cladding”, a large portion of energy transmits in the form of an evanescent wave over the fiber surface that determines the MFC ultrasensitive to local environmental changes. Consequently, MFC has the potential to develop as a sensor. With the merits of easy fabrication, low cost and compact size, numerous researches have been carried out on different microfiber coupler configurations for various sensing applications, such as refractive index (RI), temperature, humidity, magnetic field, gas, biomolecule, and so on. In this manuscript, the fabrication and operation principle of an MFC are elaborated and recent advances of MFC-based sensors for scientific and technological applications are comprehensively reviewed.

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Humidity sensor based on unsymmetrical U-shaped microfiber with a polyvinyl alcohol overlay

Cited by 64 publications

References 29 publications

Optical Fiber Optofluidic Bio‐Chemical Sensors: A Review

Optical Fiber Optofluidic Bio‐Chemical Sensors: A Review

Simultaneous Detection of Relative Humidity and Temperature Based on Silicon On-Chip Cascaded Photonic Crystal Nanobeam Cavities

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

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