Optical Humidity Sensor Based on Tapered Fiber with Multi-walled Carbon Nanotubes Slurry

Mohamed, Hasnah; Irawati, Ninik; Ahmad, Fauzan; Ibrahim, Mohd Haniff; Ambran, Sumiaty; Rahman, Mohd Azizi Abdul; Harun, Sulaiman Wadi

doi:10.11591/ijeecs.v6.i1.pp97-103

Cited by 15 publications

(13 citation statements)

References 19 publications

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“…More recently, Mohamed et al further studied the evanescent field humidity sensor based on tapered single mode fiber with 6 µm of waist diameter, which was coated with multiwalled carbon nanotubes (MWCNTs) slurry. The experiment results demonstrated that the reported sensor can be used to measure relative humidity in the range of 45% to 80% at a constant room temperature, and the improvement of sensitivity from 3.811 µW/% of bare tapered fiber to 5.17 µW/% for the coated tapered fiber with (MWCNTs) slurry were observed.…”

Section: Measurement Methodsmentioning

confidence: 99%

“…As a result, the humidity concentration can be deduced by monitoring the variations of optical signals. In recent years, the development of the studies on microfiber humidity sensors have reached a flourish stage, many forms of MF humidity sensors have been developed, such as Sagnac loop interferometer, U‐shaped microfiber interferometers, microfiber couplers (MFCs), microfiber loop (knot) resonator, microfiber grating and tapered structure . Compared with different humidity sensors based on the structure of tapered, the fiber grating, the coupler or the resonator and the interferometer, the results show that the tapered–based RH sensor is directly utilizing a microfiber to measure the humidity, so it shows a simple structure and low cost, but this method makes them easily susceptible to fluctuations of optical source and fiber loss.…”

Section: Introductionmentioning

confidence: 99%

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Research Advances in Microfiber Humidity Sensors

Peng

Zhao

Chen

et al. 2018

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An overview of the numerous latest research in microfiber humidity sensors is carried out with a specific focus on measurement methods, humidity sensitive materials, probe structures, and sensing properties of different sensors. First, five mainstream measurement structures, including taper, fiber grating, coupler, resonator, and interferometer are reviewed. It is concluded that these measurement structures sense the physicochemical property variations of microfibers or sensitive films and exhibit the change of optical signal when exposed to environment. Second, the basic preparation methods, humidity‐sensing properties, and their advantages and disadvantages as humidity sensitive material are addressed. Then, the advantages and disadvantages of all the above sensing structures are also discussed and compared. Finally, the main existing problems and potential solutions of microfiber humidity sensors are pointed out.

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Section: Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research Advances in Microfiber Humidity Sensors

Peng

Zhao

Chen

et al. 2018

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100

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“…Due to the interaction between water molecules and the CNTs coating, the effective refractive index surrounding the core will change, resulting in a shift of the Bragg wavelength and a sensitivity of 31 pm/%RH within a linear detection range from 20-90 %RH. Mohamed et al [148] prepared an optical microfiber coated with MWCNTs slurry using the drop-casting technique. The fabricated sensor demonstrated a linear detection range from 45 to 80 %RH and an improvement of 1.3 times (5.17 µW/%RH) when compared to a bare tapered fiber.…”

Section: Humiditymentioning

confidence: 99%

“…The measured results obtained from the rGO/PS-coated optical microfiber exhibited a sensitivity of −0.224 dB/%RH and −4.118 dB/%RH for detection range 50.5-70.6 %RH and 79.5-85 %RH, correspondingly. Overall, Table 3 summarizes all carbon allotrope-based RH OFS and their respective sensing performance [134,[147][148][149][150][151][152][153][154][155][156][157][158][159][160][161][162].…”

Section: Humiditymentioning

confidence: 99%

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Yap

Chan

Tjin

et al. 2020

Sensors

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Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.2 of 43 of target molecules or physical parameters. In some instances, surface-modified carbon allotropes also permit multi-parameter detection capabilities of carbon allotrope-based OFS [7]. As such, an insight into the recent advances of carbon allotrope-based OFS can serve as a guideline to develop an effective detection approach for emerging real-world applications. Many review articles on carbon allotrope-based OFS mainly focus on a single type of carbon allotrope and the fundamental theory of carbon allotrope-based OFS [8,9]. Thus, this comprehensive review article encompasses the properties, preparation, sensing mechanisms, nanocoating deposition techniques, physical and biochemical sensing applications. This review aims to highlight the recent research work on carbon allotrope-based OFS that will serve as a reference guide for researchers to develop optimal detection approaches for physical parameters or trace level monitoring of chemical and biomolecules. Four groups of carbon allotropes, including carbon nanotubes (CNT), carbon dots (CDs), graphene, and nanodiamonds (NDs), will be studied. Commonly adopted synthesis approaches, classification of various deposition techniques for the integration of carbon allotropes as the thin film coating of OFS as well as numerous examples of these carbon allotrope-based OFS will also be outlined.

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“…Additionally, non-uniform sensor structures, such as the Fabry-Perot cavity [ 7 ], fiber taper [ 8 ], micro-nano fiber [ 9 ], side-polished fiber [ 10 ], and U-bent fiber [ 11 ], are fragile and unfit for mass production [ 12 , 13 , 14 , 15 , 16 ]. Moreover, the combination of the functional materials and fiber sensors shows non-uniformity and uncertainty as well, especially when it comes to graphene oxide [ 17 ], metal oxide [ 18 ], UV gels [ 19 ], and nanoparticles [ 20 ]. For practical applications, fiber Bragg grating (FBG) combined with polymer provides a better way due to its long service and uniformity in mass production.…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

Luo

Liu

et al. 2020

Sensors

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We propose and demonstrate a temperature and humidity sensor based on a fluorinated polyimide film and fiber Bragg grating. Moisture-induced film expansion or contraction causes an extra strain, which is transferred to the fiber Bragg grating and leads to a humidity-dependent wavelength shift. The hydrophobic fluoride doping in the polyimide film helps to restrain its humidity hysteresis and provides a short moisture breathing time less than 2 min. Additionally, another cascaded fiber Bragg grating is used to exclude its thermal crosstalk, with a temperature accuracy of ±0.5 °C. Experimental monitoring over 9000 min revealed a considerable humidity accuracy better than ±3% relative humidity, due to the sensitized separate film-grating structure. The passive and electromagnetic immune sensor proved itself in field tests and could have sensing applications in the electro-sensitive storage of fuel, explosives, and chemicals.

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Optical Humidity Sensor Based on Tapered Fiber with Multi-walled Carbon Nanotubes Slurry

Abstract: We demonstrated performance comparison of optical humidity sensor for bare and Multi-walled carbon nanotubes (MWCNTs)

Cited by 15 publications

References 19 publications

Research Advances in Microfiber Humidity Sensors

Research Advances in Microfiber Humidity Sensors

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

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