Integrating microsphere resonator and ZnO nanorods coated glass for humidity sensing application

Jali, Mohd Hafiz; Rahim, Hazli Rafis Abdul; Johari, Ashadi Md; Ahmad, A.; Yusof, Haziezol Helmi Mohd; Johari, Siti Halma; Baharom, Mohamad Faizal; Thokchom, Siddharth; Dimyati, Kaharudin; Harun, Sulaiman Wadi

doi:10.1016/j.optlastec.2021.107356

Cited by 9 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zinc oxide (ZnO) is a versatile semiconductor material that exhibits considerable flexibility and has been extensively use in various fields such as electrochemical [32], optical [33], and photocatalysis [34]. The optical characteristics of the proposed sensor can be observed by exposing it to different refractive index (RI) solution [35,36]. When the nanomaterial is exposed to different RI solution, the amount of molecule adsorption onto the ZnO would change the refractive index of the nanomaterial [37].…”

Section: A Sensing Mechanismmentioning

confidence: 99%

Optical Characterization of Different Scattering Area on ZnO Nanorods Coated Glass Substrate Based on Side Coupling Technique for Sensing Application

Jahava,

Jali,

Norashikin

et al. 2024

IEEE Access

Self Cite

View full text Add to dashboard Cite

An optical characterization of the proposed sensing scheme comprises of ZnO nanorods coated glass substrate based on side coupling technique for different scattering area is reported. The glass substrate was coated with a highly responsive nanomaterial which is Zinc Oxide (ZnO) nanorods using hydrothermal technique. The scattering area were varied into five samples of 0.016m 2 , 0.018m 2 , 0.020m 2 , 0.022m 2 and 0.024m 2 . The samples were exposed to a range of RI solutions spanning from a concentration of 0% to 100%. Based on experimental results, the sample with an area of 0.022m 2 exhibited outstanding characteristics in most of the performance parameters such as α, γ, output light intensity and sensitivity towards different RI solution. The sample demonstrates a notably elevated level of light intensity and output voltage in comparison to the closest best samples by a factor of 1.1. Besides it produced linearity of 97.5% and sensitivity of 0.0125V/%. The proposed sensor exploits the visible light using the side coupling technique applied on the glass surface that was coated with Zinc Oxide (ZnO) nanorods to enhance the output coupling voltage. It effectively employed the scattering and surface absorption properties to interact with different refractive index solutions INDEX TERMS ZnO nanorods, glass substrate, scattering area, refractive index, side coupling

show abstract

Section: A Sensing Mechanismmentioning

confidence: 99%

Optical Characterization of Different Scattering Area on ZnO Nanorods Coated Glass Substrate Based on Side Coupling Technique for Sensing Application

Jahava,

Jali,

Norashikin

et al. 2024

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…The optical setup acts as a two-path multi-beam interferometer due to a couple of reflective surfaces generating a wavelength-modulated reflection output spectrum. Based on the FBL interferometer (FBLI), broadband fiber sensors have been reported for the measurement of different variables such as displacement [ 12 ], glucose in ionized water [ 13 ], humidity [ 14 , 15 ], and formaldehyde [ 16 , 17 ], with improved and repeatable results. For these reported approaches, the interrogation method is the determination of the free spectral range (FSR) variation as a function of the measured variable.…”

Section: Introductionmentioning

confidence: 99%

Refractive Index Fiber Laser Sensor by Using a Fiber Ball Lens Interferometer with Adjustable Free Spectral Range

Álvarez-Tamayo

Prieto-Cortés

2023

Sensors

View full text Add to dashboard Cite

In this work, a fiber laser refractometer based on a fiber ball lens (FBL) interferometer is proposed. The linear cavity erbium-doped fiber laser uses an FBL structure acting as a spectral filter and sensing element for determining the RI of a liquid medium surrounding the fiber. The optical interrogation of the sensor is the wavelength displacement of the generated laser line as a function of the RI variations. For the proposed FBL interferometric filter, the free spectral range of its wavelength-modulated reflection spectrum is adjusted to maximum in order to obtain RI measurements in a range of 1.3939 to 1.4237 RIU, from laser wavelength displacements in a range from 1532.72 to 1565.76 nm. The obtained results show that the wavelength of the generated laser line is a linear function of the RI variations on the medium surrounding the FBL with a sensitivity of 1130.28 nm/RIU. The reliability of the proposed fiber laser RI sensor is analytically and experimentally investigated.

show abstract

“…8,9 The realization of a fiber humidity respiration sensor relies on the deposition of a moisture-sensitive coating on the fiber surface. 10 Currently, graphene oxides (GOs), 11 poly(vinyl alcohol) (PVA), 12 and ZnO nanorods 13 have been applied as the moisture-sensitive coating. However, their applications in respiration monitoring are limited due to toxicity, nonbiodegradability, and environmental concerns.…”

mentioning

confidence: 99%

Wearable Fiber SPR Respiration Sensor Based on a LiBr-Doped Silk Fibroin Film

Guo,

Ning,

Zhang

et al. 2023

ACS Sens.

View full text Add to dashboard Cite

Respiration is essential for supporting human body functions. However, a biocompatible fiber respiration sensor has rarely been discussed. In this study, we propose a wearable fiber surface plasmon resonance (SPR) respiration sensor using a LiBr-doped silk fibroin (SF) film. The SPR sensor monitors respiration by responding to airway humidity variation during inhalation and exhalation. We fabricated the SPR respiration sensor by depositing the core of a plastic-clad optical fiber with a gold film and an SF-LiBr composite film. The SF-LiBr composite film can absorb water through the interaction between water molecules and hydrogen bonds linking fibroin chains. Thus, humidity variation can change the SF-LiBr composite film’s refractive index (RI), altering the phase-matching condition of the surface plasmon polaritons and shifting the SPR spectral dip. In experiments, we test the effect of the LiBr doping ratio on humidity response and confirm that the SF-22.1 wt % LiBr sensor has balanced performances. The SF-22.1 wt % LiBr sensor has a broad sensing range of 35–99% relative humidity (RH), a reasonable overall sensitivity of −6.5 nm/% RH, a fast response time of 135 ms, a quick recovery time of 150 ms, good reversibility, and good repeatability, which is capable of tracking different respiration states and patterns. Finally, we encapsulate this sensor in a conventional nasal oxygen cannula for wearable respiration monitoring, proving that the sensor is suitable for high-sensitivity, real-time, and accurate respiration monitoring.

show abstract

Integrating microsphere resonator and ZnO nanorods coated glass for humidity sensing application

Cited by 9 publications

References 34 publications

Optical Characterization of Different Scattering Area on ZnO Nanorods Coated Glass Substrate Based on Side Coupling Technique for Sensing Application

Optical Characterization of Different Scattering Area on ZnO Nanorods Coated Glass Substrate Based on Side Coupling Technique for Sensing Application

Refractive Index Fiber Laser Sensor by Using a Fiber Ball Lens Interferometer with Adjustable Free Spectral Range

Wearable Fiber SPR Respiration Sensor Based on a LiBr-Doped Silk Fibroin Film

Contact Info

Product

Resources

About