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Graphene oxide-coated microbottle resonators for relative humidity sensing

Optoelectronics Letters 2024年第7期20卷 400-405页

作者： Huda Adnan Zain malathy batumalay Md Ashadi Md Johari Hazli Rafis Abdul Rahim Sulaiman Wadi Harun Department of Electrical Engineering Faculty of Engineering University of Malaya Faculty of Data Science and Information Technology INTI International University Faculty of Electrical and Electronic Engineering Technology Universiti Teknikal Malaysia Melaka Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka

Graphene oxide(GO) is a 2D coating material used to improve fiber optics sensors' response to relative humidity. Microbottle resonators(MBRs) have garnered more attention as sensing media structures. An MBR with a 190 μm diameter was coated with GO. Then, tapered fiber light coupling was used to investigate the relative humidity sensing performance in the range of 35—70%RH at 25 °C. The MBR showed a higher Q factor before and after GO coating. The sensitivity of 0.115 d B/%RH was recorded with the 190 μm GO-coated MBR sample compared to a sensitivity of 0.022 d B/%RH for the uncoated MBR sample. These results show that the MBR can be used in fiber optic sensing applications for environmental sensing.

关键词： A

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Numerical analysis of a Kretschmann surface plasmon resonance sensor with silver/TiO_(2)/BaTiO_(3)/silver/graphene for refractive index sensing

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Optoelectronics Letters 2023年第10期19卷 583-586页

作者： Huda A.Zain malathy batumalay Hazli R.A.Rahim Sulaiman Wadi Harun Department of Electrical Engineering University of MalayaKuala Lumpur50603Malaysia Faculty of Data Science&IT INTI International UniversityNilaiNegeri Sembilan71800Malaysia Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia MelakaMelakaMalaysia

The sensitivity of a Kretschmann surface plasmon resonance(SPR)sensor was *** Kretschmann setup had multiple layers,a BK7 prism,silver,barium titanate(BaTiO_(3)),titanium dioxide(TiO_(2)),and *** BaTiO_(3)and TiO_(2)coatings were sandwiched between two silver *** sensitivity of 260°/RIU has been *** graphene layers are added to the configuration to improve sensitivity and as a bio-compatibility *** configuration can be used for biochemical sensors.

关键词： silver surface resonance

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Single-walled carbon nanotubes coated D-shaped fiber for aqueous ethanol detection

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Optoelectronics Letters 2022年第7期18卷 430-433页

作者： Huda Adnan Zain malathy batumalay Hazli Rafis Abdul Rahim Moh Yasin Sulaiman Wadi Harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Faculty of Information Technology INTI International UniversityNilai 71800Malaysia Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia MelakaMelakaMalaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

In this letter,single-walled carbon nanotubes(SWCNT)coating was used on the D-shaped silica fiber for ethanol sensing in aqueous *** performance of this structure as an ethanol sensor was studied here by monitoring output power variation and wavelength shift with changing ethanol *** the concentration range of 5%—50%of ethanol,the SWCNT coated structure showed an improved sensitivity compared to the uncoated *** sensitivity is improved from 0.0135 dB/%to 0.0409 dB/%with the *** SWCNT coated sample also showed a peak wavelength shift of 0.1 nm with the change of ethanol concentration in the same range.

关键词： shaped fiber walled

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Agarose coated micro-bottle sensor for relative humidity detection

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Optoelectronics Letters 2021年第6期17卷 328-333页

作者： Huda Adnan Zain malathy batumalay Md Ashadi Md Johari Kaharudin Dimyati Sulaiman Wadi Harun Department of Electrical Physics University of MalayaKuala Lumpur 50603Malaysia Faculty of Information Technology INTI International UniversityNilai 71800Malaysia Faculty of Electrical and Electronic Engineering Technology Universiti Teknikal Malaysia MelakaMelaka 76100Malaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

The whispering gallery mode(WGM)based micro-bottle resonator(MBR)sensor has been proposed and demonstrated for relative humidity measurement by using an agarose gel as a *** was fabricated by using a soften-and-compress method to form a 190μm bulge *** micro-bottle was optically excited by a 3μm tapered fiber and it exhibits a resonance with a Q factor in an order of 10^(5).The agarose coated MBR produces a good sensing response towards humidity with the sensitivity of 0.107 d B/%RH and linearity of 99.614%.The agarose hydrophilic nature and its changing porosity and refractive index with increasing relative humidity made the coated MBR structure to be more sensitive than the uncoated *** humidity sensor has a simple fabrication and is showing good sensitivity,linearity,resolution,response time and operational in a wide humidity range.

关键词： structure. humidity bottle

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