A5060281529- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Advanced Chemical Sensor Technologies
- Conducting polymers and applications
- Electrochemical sensors and biosensors
- Water Quality Monitoring and Analysis
- Photonic Crystal and Fiber Optics
- Plasmonic and Surface Plasmon Research
- Transition Metal Oxide Nanomaterials
The Federal Polytechnic, Ado-Ekiti
2020-2022
Federal Polytechnic, Mubi
2020-2022
Universiti Putra Malaysia
2013-2022
We demonstrate an ammonia sensor composed of a tapered multimode fiber coated with polyaniline nanofibers that operates at room temperature (26°C). The optical properties the layer changes when it is exposed to ammonia, leading change in absorption evanescent field. was tested by exposing different concentrations and absorbance measured using spectrophotometer system. Measured response recovery times are about 2.27 minutes 9.73 minutes, respectively. sensitivity can be controlled adjusting...
Ethanol is a highly combustible chemical universally designed for biomedical applications. In this paper, optical sensing performance of tapered multimode fiber tip coated with carbon nanotube (CNT) thin film towards aqueous ethanol different concentrations investigated. The CNT using drop-casting technique and annealed at 70 °C to enhance the binding nanomaterial silica tip. layer are micro-characterized FESEM Raman spectroscopy techniques. When developed sensor was exposed (5% 80%),...
Ammonia detection in ambient air is critical, given its implication on the environment and human health. In this work, an optical fiber tapered to a 20 µm diameter coated with graphene oxide was developed for absorbance response monitoring of ammonia at visible (500–700 nm) near-infrared wavelength regions (700–900 nm). The morphology, surface characteristics, chemical composition samples were confirmed by field emission scanning electron microscope, atomic force X-ray diffraction, energy...
Gaseous pollutants such as hydrogen gas (H2) are emitted in daily human activities. They have been massively studied owing to their high explosivity and widespread usage many domains. The current research is designed analyse optical fiber-based H2 sensors by incorporating palladium/graphene oxide (Pd/GO) nanocomposite coating sensing layers. fabricated multimode silica fiber (MMF) were used a transducing platform. tapering process essential improve the sensitivity environment through...
Optical Fiber Bragg Grating (FBG) is commonly deployed as a wavelength selective filter in telecommunication well to detect physical changes such pressure, temperature and strain sensing applications. This paper presents an investigation of FBG chemical sensor towards ethanol aqueous solution. Telecommunication standard single mode FBGs were coated with different thicknesses thin gold films via sputtering deposition method. The combination gratings film enhances the evanescent wave on...
Ethanol is a highly flammable chemical and widely used for medical industrial applications. In this paper, optical sensing performance of aqueous ethanol with different concentrations investigated using multimode fiber coated carbon nanotubes (CNT). The tip CNT via drop-casting technique annealed at 70 °C to improve the binding nanomaterial silica fiber. layer are microcharacterized field emission scanning electron microscopy, Raman spectroscopy, X-ray diffraction techniques. reflectance...
The investigation of graphene oxide (GO) for sensing applications is attractive due to its nanoscale structure and properties has yet be fully understood. In this paper, optical response GO coated fiber sensor towards ethanol described. was onto a multimode tapered by drop-casting technique. exposed 5–40% in water. films were characterized with field emission scanning electron microscope, ultraviolet-visible spectroscopy Raman spectroscopy. based on changes following the absorbance upon...
This paper describes the application of a palladium (Pd)-coated tapered optical fiber in order to develop hydrogen (H2) sensor. A transducing channel was fabricated with multimode (MMF) cladding and core diameters 125 µm 62.5 µm, respectively, enhance evanescent field light propagation through fiber. The from diameter waist 20 waist-length 10 mm, down taper up 5 coated Pd using drop-casting technique. In establish palladium's properties, various characterization techniques were applied, such...
Ethanol is a widely used chemical in the industry which can be volatile and flammable. However, availability of optical sensors for ethanol still its maturing stage. In this project, tapered multimode fiber optic sensor detection with different concentrations water was developed. The working principle based on absorption spectroscopy visible wavelength ranges. fabricated using Vytran glass processing workstation to achieve waist diameter length 40 μm 20 mm, respectively. Upon exposure ranges...
A graphene oxide layer deposited on top of a thin gold film fiber optic surface plasmon resonance sensor is investigated. Comparison made the sensing performance modified and standard coated sensor. The shows high sensitivity approximately 400 nm/RIU to surrounding refractive index when tested with different liquids.
In this work, molybdenum trioxide (MoO3) was synthesized and deposited on tapered optical fiber using the drop-casting technique for hydrogen (H2) detection at room temperature. A transducing platform in a transmission mode constructed multimode (MMF) with 125 µm cladding 62.5 core diameter. To enhance evanescent light field surrounding fiber, fibers were from diameter to 20 10 mm waist. The microstructures chemical compositions of fabricated sensor analyzed by emission scanning electron...
This work demonstrates a hydrogen (H2) sensor at room temperature made of tapered optical fibers coated with polyaniline (PANI) nanofiber. A transducing platform was constructed using multimode fiber (MMF) 125 µm cladding and 62.5 core diameter. In order to enhance the light evanescent field surrounding fiber, were from in diameter 20 10 mm waist PANI drop casting technique. Various characterization techniques, such as emission scanning electron microscopy (FESEM), energy dispersive X-ray...
In this paper, optical multimode fiber reflectance sensor for ethanol with different concentrations in water was developed. The coated graphene oxide (GO) by drop-casting technique. dynamic response of GO nanostructured thin film on tip exposed to liquid investigated. characterized via Raman microscopy and Scanning Electron Microscopy (SEM). decreased 37% when the 5% concentration water. shows fast recovery as low 30 s 45 s, respectively.
This study describes the development of a palladium-coated (Pd) optical fiber for room temperature (H2) hydrogen application process. To improve evanescent light field that propagates through fiber, multimode was used to fabricate transducing channel with cladding and core diameters 125 μm 62.5 respectively. The fibers were tapered from 20 diameter, 10 mm waist-length, 5 up down region, coated Pd by using drop-casting technique. Various characterization techniques have been characterize...