Effects of TiO2 on the performance of silver coated on side-polished optical fiber for alcohol sensing applications

Kanmani, R.; Zainuddin, Nur Aina’a Mardhiah; Rusdi, Muhammad Farid Mohd; Harun, Sulaiman Wadi; Ahmed, Kawsar; Amiri, Iraj Sadegh; Zakaria, Rozalina

doi:10.1016/j.yofte.2019.03.010

Cited by 24 publications

(8 citation statements)

References 20 publications

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“…The effectiveness of these 2D materials was compared with regards to other thicknesses of Ti coating. The SPR for Ti was recorded at the range of 500 nm to 600 nm [16]. Based on the SPR of Ti, this range of wavelength will contribute to the most sensitive shifting due to the optimum thickness.…”

Section: Resultsmentioning

confidence: 99%

“…The selection of transmission dip in the humidity sensor was based on the similar shape of the transmission dip for Ti-WS 2 . The sensitivity of the humidity sensor can be evaluated by the range of relative power based on the optical characteristics divided by the range of relative humidity (∆RP/∆RH) [16]. However, in this case, the sensitivity was determined by observing the response of shifting in the transmission dip.…”

Section: Resultsmentioning

confidence: 99%

“…The use of Ti coating also protects the metal from oxidation [15]. Using the side-polishing technique, a single-mode fiber (SMF) can be fabricated, as the technique removes a portion of the cladding region [16,17,18]. By doing so, an evanescent field can be created whereby light escapes from the core region and is propagated within the polished surface region.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

et al. 2019

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In this paper, we report the effects of a side-polished fiber (SPF) coated with titanium (Ti) films in different thicknesses, namely 5 nm, 13 nm, and 36 nm, protected by a thin layer of transition metal dichalcogenides (TMDCs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2), which provide ultra-sensitive sensor-based surface plasmon resonance (SPR) covering from the visible to mid-infrared region. The SPF deposited with Ti exhibits strong evanescent field interaction with the MoS2 and WS2, and good optical absorption, hence resulting in high-sensitivity performance. Incremental increases in the thickness of the Ti layer contribute to the enhancement of the intensity of transmission with redshift and broad spectra. The findings show that the optimum thickness of Ti with 36 nm combined with MoS2 causes weak redshifts of the longitudinal localized surface plasmon resonance (LSPR) mode, while the same thickness of Ti with WS2 causes large blueshifts. The redshifts are possibly due to a reduced plasmon-coupling effect with the excitonic region of MoS2. The observed blueshifts of the LSPR peak position are possibly due to surface modification between WS2 and Ti. Changing the relative humidity from 58% to 88% only elicited a response in Ti/MoS2. Thus, MoS2 shows more sensitivity on 36-nm thickness of Ti compared with WS2. Therefore, the proposed fiber-optic sensor with integration of 2D materials is capable of measuring humidity in any environment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

et al. 2019

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“…They are designed to operate with interferometry and optical resonances. Such devices have used more advanced structures such as D-shaped optical fibers [5], long-period gratings [6], fiber Bragg gratings [7], as well as the photonic crystal fibers [8]. In addition, more advanced optical sensors with higher performance can be produced by integrating optical fibers and materials in the device.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Comparison of Refractive Index Transducer Optical Fiber Based on Surface Plasmon Resonance Using Ag, Cu, and Bimetallic Ag–Cu Layer

et al. 2020

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A single-mode optical fiber sensor uses surface plasmon resonance (SPR) with a bimetallic silver–copper (Ag–Cu) coating compared to a single layer of Ag and Cu itself. Bimetallic Ag–Cu sensors are constructed by simple fabrication on a side-polished optical fiber, followed by an electron beam evaporation of Ag and Cu films. For this investigation, the thickness of the single Ag layer was set to 30 nm and the single Cu layer was set to 30 nm; whereas for the bimetallic combined Ag–Cu layer the thickness of Ag was 7 nm and Cu 23 nm. The sensor performance was analyzed and compared experimentally and numerically using the COMSOL Multiphysics. A white light source was used with a broad optical bandwidth to provide a range of wavelengths to the optical fiber. The characteristics of the thin layers of Ag, Cu, and Ag–Cu as alcohol sensors were evaluated. We found that Cu was the most sensitive metallic layer compared to the Ag and the bimetallic Ag–Cu layers. For a 100% alcohol concentration, Cu showed a sensitivity of 425 nm/RIU followed by the bimetallic Ag–Cu layer with 108.33 nm/RIU, whereas the Ag layer was not detected. Interestingly, sensitivity reached saturation beyond the 20 nm thick layer of Ag. This shows that the Cu and the bimetallic Ag–Cu layers are suitable for an alcohol-based optical sensor.

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“…The titanium(IV) oxide (TiO 2 ) has gained much attentions due to owning a high refractive index, a good chemical stability, and an elevated dielectric constant in sensing applications [18]. It is used in paints, printing ink, rubber, paper, cosmetics, pharmaceuticals, sunscreens, car materials, implanted biomaterials, and decomposing organic matters in wastewater, [16].…”

Section: Introductionmentioning

confidence: 99%

Purification of Dickeya solanil-Asparaginase and Study of the Influence of TiO2 and ZnO Nanoparticles on Its Enzymatic Activity

et al. 2019

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L-asparaginase catalyzes the hydrolysis of L-asparagine to L-aspartate and ammonia. In the present study, we describe the production, purification, and preliminary characterization of Dickeya solani L-asparaginase. The purification of L-asparaginase was done using ion-exchange chromatography on HiTrap Q-Sepharose Fast Flow followed by FPLC-gel filtration chromatography on Superdex 75 pg. The presence of the enzyme was confirmed by enzymatic activity measurements along with SDS-PAGE analysis. The purified L-asparaginase was shown to exhibit specificity towards L-asparagine, while being inactive against L-glutamine. This data allows us to suggest that the L-asparaginase from Dickeya solani might be clinically more relevant than, e.g., the L-asparaginase isolated from E. coli which hydrolyzed also L-glutamine and produces L-glutamate, a neurotoxic agent. We also demonstrated that the enzymatic activity was enhanced in the presence of TiO 2 and ZnO nanoparticles, making them good candidates to improve L-asparaginase activity. Indeed, the results obtained show that the TiO 2 nanoparticles increased the activity of L-asparaginase by a factor of 6.0 while the ZnO nanoparticles increased it twice.

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Effects of TiO2 on the performance of silver coated on side-polished optical fiber for alcohol sensing applications

Cited by 24 publications

References 20 publications

Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

Sensitivity Comparison of Refractive Index Transducer Optical Fiber Based on Surface Plasmon Resonance Using Ag, Cu, and Bimetallic Ag–Cu Layer

Purification of Dickeya solanil-Asparaginase and Study of the Influence of TiO2 and ZnO Nanoparticles on Its Enzymatic Activity

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