ZnO nanorods coated microfiber loop resonator for relative humidity sensing

Zain, Huda Adnan; Jali, Mohd Hafiz; Rahim, Hazli Rafis Abdul; Johari, Ashadi Md; Yusof, Haziezol Helmi Mohd; Thokchom, Siddharth; Yasin, Moh.; Harun, Sulaiman Wadi

doi:10.1016/j.yofte.2019.102080

Cited by 15 publications

(12 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sensing Element Range (%RH) Sensitivity This work U-shape POF 35-90 0.0231 V/%RH [6] Silica fiber 50-80 0.5221 dBm/% [44] Straight POF 40-90 4.98 nm/%RH [45] Glass substrate 35-85 0.0527 dBm/% [46] Silica fiber 35-85 0.2774 dBm/% [47] Twisted macro-bend POF 40-80 4.23 nW/% [48] Straight POF 50-75 0.0172 mV/% Both sensors (N-UPOF and Z-UPOF) were tested for voltage stability by exposure to 90% RH where the output voltages were recorded continuously for 60 s on the first day and after 10 days. Figure 7 displays N-UPOF and Z-UPOF voltage stability for the 1st and 10th days.…”

Section: Refsmentioning

confidence: 97%

ZnO Nanorods Coated Tapered U-Shape Plastic Optical Fiber for Relative Humidity Detection

et al. 2022

Self Cite

View full text Add to dashboard Cite

A relative humidity sensor was fabricated by exploiting an evanescent wave (EW) on a U-bent tapered plastic optical fiber (POF) coated with zinc oxide (ZnO) nanorods. The POF was tapered manually using a polishing method to a diameter of 0.5 mm, a length of 5 cm, and a radius of 5 cm. ZnO nanorods were synthesized using a hydrothermal method and grown on the POF by a seeding process for 12 h. A significant response of the sensor was observed when the sensor was exposed to 35 to 90%RH due to the intense chemisorption process and changeable relative index in the POF. The sensitivity and resolution of the sensor have been improved by factors of 1.23 and 2.18, respectively, compared to the conventional tapered POF sensor without ZnO coating. Besides, the ZnO-coated sensor also exhibited better repeatability properties in terms of output voltage when exposed to 35 to 90%RH for three repeated measurements. The obtained results revealed that the proposed new POF sensor has an excellent sensing performance as an RH sensor in terms of sensitivity, repeatability, and stability properties.

show abstract

Section: Refsmentioning

confidence: 97%

ZnO Nanorods Coated Tapered U-Shape Plastic Optical Fiber for Relative Humidity Detection

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fiber-optical sensors have emerged as a promising candidate for liquid refractive index sensing due to their attractive advantages, such as flexible structural design, ease of integration, and immunity to electromagnetic interference [1][2][3][4]. Nowadays, various fiber sensing configurations based on different optical mechanisms have been designed for measuring liquid RI, including long period grating [5][6][7], fiber Bragg grating [8][9][10], microfiber resonator [11][12][13], microstructure fiber [14][15][16], and mode interferometer [17][18][19]. However, the * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Vernier-effect-based fiber microcoupler for highly sensitive liquid refractive index sensing

Sun,

Wu,

Song

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

An orthogonal mode interferometer (OMI) is proposed and experimentally demonstrated for liquid refractive index sensing using the optical Vernier effect. The OMIs are based on weakly fiber microcouplers, which are fabricated by fusing single mode fiber and coreless fiber together. Owing to the birefringent characteristic of the hybrid coupler, the optical Vernier effect is dependent on the overlap of mode interference between the x and y polarizations. Compared to the response of the individual resonance dip, the signal demodulation of the Vernier envelope exhibits more excellent signal amplification capability. Experimental results show that the Vernier envelope of the OMI achieves a refractive index (RI) sensitivity of 22427.03 nm/RIU near the RI of 1.33 with a magnification factor of 4.1. Moreover, with its high sensitivity, flexible design and simplified configuration, our proposed OMI based on the optical Vernier effect is well suitable for a wide range of biosensing applications.

show abstract

“…20−22 Among them, metal oxides are always preferred for humidity-sensing applications due to their high stabilities and sensitivities. [11][12][13]23 In particular, zinc oxide (ZnO) is a highly promising material for humidity sensing owing to its strong hydrophilicity and easily manipulable surface morphology. 24−26 ZnO nanostructures have been synthesized with different shapes including nanoparticle, 27 nanorods, 28 nanowires, 29 nanotetrapods, 24 nanoflowers, 30 and nanofibers.…”

Section: Introductionmentioning

confidence: 99%

“…The use of sensitive material deposited onto the fiber surface has become an alternative method to improve the performance of optical fiber humidity sensors, including metal oxides, − polymers, , carbon materials, , two-dimensional (2D) materials, , and composite materials. − Among them, metal oxides are always preferred for humidity-sensing applications due to their high stabilities and sensitivities. − , In particular, zinc oxide (ZnO) is a highly promising material for humidity sensing owing to its strong hydrophilicity and easily manipulable surface morphology. − ZnO nanostructures have been synthesized with different shapes including nanoparticle, nanorods, nanowires, nanotetrapods, nanoflowers, and nanofibers . However, the humidity sensor based on sensitive layer is usually coated with a thick film to sacrifice response time for high sensitivity, and there is still a great challenge to achieve high sensitivity and fast response at the same time.…”

Section: Introductionmentioning

confidence: 99%

ZIF-90-Derived Porous ZnO Coated Optical Microfiber Interferometer Sensor for Enhanced Humidity Sensing and Breath Monitoring

Lin

Huang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Humidity plays an important role in many fields, and the realization of high sensitivity and fast response simultaneously for humidity detection is a great challenge in practical application. In this work, we demonstrated a highperformance relative humidity (RH) sensor made by supporting zeolitic imidazolate framework-90 (ZIF-90)-derived porous zinc oxide (ZnO) onto an optical microfiber Sagnac interferometer (OMSI). The ZIF-90-modified OMSI (ZIF-90-OMSI) sensor was in situ heated at different temperatures to obtain porous ZnO, and their humidity-sensing properties were investigated ranging from 25 to 80% RH. The experimental results showed that the porous ZnO fiber sensor prepared at 500 °C (Z500-OMSI) exhibited best humidity-sensing performance with a high sensitivity of 96.2 pm/% RH (25−45% RH) and 521 pm/% RH (50−80% RH) and ultrafast response/recovery time (62.37/206.67 ms) at 22.3% RH. These performances were attributed to the complete transformation of ZIF-90 to ZnO at 500 °C. The obtained Z500 not only retained the high porosity and specific surface area of ZIF-90 but also exhibited the exceptional hydrophilicity of ZnO. In addition, the signals of the proposed Z500-OMSI sensor changed with different breathing patterns, indicating the possibility for human respiration monitoring. This work provided a reliable candidate for an effective RH monitoring system with potential application in medical diagnoses, industrial production, environmental detection, and human health monitoring.

show abstract

ZnO nanorods coated microfiber loop resonator for relative humidity sensing

Cited by 15 publications

References 24 publications

ZnO Nanorods Coated Tapered U-Shape Plastic Optical Fiber for Relative Humidity Detection

ZnO Nanorods Coated Tapered U-Shape Plastic Optical Fiber for Relative Humidity Detection

Vernier-effect-based fiber microcoupler for highly sensitive liquid refractive index sensing

ZIF-90-Derived Porous ZnO Coated Optical Microfiber Interferometer Sensor for Enhanced Humidity Sensing and Breath Monitoring

Contact Info

Product

Resources

About