Highly Sensitive Plasmonic Optical Sensors Based on Gold Core–Satellite Nanostructures Immobilized on Glass Substrates

2016 ◽  
Vol 8 (32) ◽  
pp. 20522-20526 ◽  
Author(s):  
Kentaro Ode ◽  
Mai Honjo ◽  
Yohei Takashima ◽  
Takaaki Tsuruoka ◽  
Kensuke Akamatsu
Keyword(s):  
Optical Sensors ◽  
Glass Substrates ◽  
Gold Core ◽  
Highly Sensitive

Laser-written nanoporous silicon ridge waveguide for highly sensitive optical sensors

2012 ◽  
Vol 37 (2) ◽  
pp. 256 ◽  
Author(s):  
Jinan Xia ◽  
Andrea M. Rossi ◽  
Thomas E. Murphy
Keyword(s):  
Optical Sensors ◽  
Ridge Waveguide ◽  
Nanoporous Silicon ◽  
Highly Sensitive

scholarly journals Highly Sensitive Fluorescence Sensor for Carrageenan from a Composite Methylcellulose/Polyacrylate Membrane

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5043
Author(s):  
Riyadh Abdulmalek Hassan ◽  
Lee Yook Heng ◽  
Ling Ling Tan
Keyword(s):  
Composite Membrane ◽  
Optical Sensors ◽  
Optical Sensor ◽  
Detrimental Effect ◽  
Acrylic Polymer ◽  
Sulphated Polysaccharides ◽  
Highly Sensitive ◽  
Confectionery Products ◽  
Linear Manner ◽  
Better Than

Carrageenans are linear sulphated polysaccharides that are commonly added into confectionery products but may exert a detrimental effect to human health. A new and simpler way of carrageenan determination based on an optical sensor utilizing a methylcellulose/poly(n-butyl acrylate) (Mc/PnBA) composite membrane with immobilized methylene blue (MB) was developed. The hydrophilic Mc polymer membrane was successfully modified with a more hydrophobic acrylic polymer. This was to produce an insoluble membrane at room temperature where MB reagent could be immobilized to build an optical sensor for carrageenan analysis. The fluorescence intensity of MB in the composite membrane was found to be proportional to the carrageenan concentrations in a linear manner (1.0–20.0 mg L−1, R2 = 0.992) and with a detection limit at 0.4 mg L−1. Recovery of spiked carrageenan into commercial fruit juice products showed percentage recoveries between 90% and 102%. The optical sensor has the advantages of improved sensitivity and better selectivity to carrageenan when compared to other types of hydrocolloids. Its sensitivity was comparable to most sophisticated techniques for carageenan analysis but better than other types of optical sensors. Thus, this sensor provides a simple, rapid, and sensitive means for carageenan analysis.

Thin Chitosan Films for Optical Gas Sensors

2014 ◽  
Vol 605 ◽  
pp. 536-539 ◽  
Author(s):  
Alexander Y. Mironenko ◽  
Alexander A. Sergeev ◽  
Sergey Voznesensky ◽  
Svetlana Y. Bratskaya
Keyword(s):  
Gas Sensors ◽  
Optical Sensors ◽  
Linear Response ◽  
Gaseous Ammonia ◽  
Natural Polysaccharide ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
Ammonia Detection ◽  
Chitosan Films ◽  
Highly Sensitive Detection

Here we report on fabrication of integrated-optical sensors for relative humidity and ammonia detection based on natural polysaccharide chitosan. The sensing properties of the fabricated sensor to gaseous ammonia are presented. The sensor exhibits a linear response in the range of 1-300 ppm with the response time less than 1 second. It has been shown that 1 μm-thick chitosan-based waveguide film allows highly sensitive detection of RH level.

scholarly journals Water-stable Perovskite-loaded Nanogels Containing Antioxidant Property for Highly Sensitive and Selective Detection of Roxithromycin in Animal-derived Food Products

2021 ◽  
Author(s):  
Jinsol Han ◽  
Mirkomil Sharipov ◽  
Youngil Lee ◽  
Bui The Huy ◽  
YONG-ILL LEE ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Food Products ◽  
Antioxidant Property ◽  
Aqueous Solvent ◽  
Highly Sensitive ◽  
Antioxidant Function ◽  
Perovskite Nanoparticles ◽  
Enhanced Stability

Abstract Luminescent inorganic lead halide perovskite nanoparticles lack stability in aqueous solutions, which limits their application to optical sensors. Here, hybrid CsPbBr3-loaded MIP nanogels were developed with enhanced stability in aqueous media. Multifunctional MIP nanogels with antioxidant function and hydrophobic cavities were synthesized from HEMA derivatives in the presence of roxithromycin as a template. The CsPbBr3 nanoparticles were loaded into pre-synthesized MIP nanogels via in-situ synthesis with a size distribution of 200 nm. The developed CsPbBr3-nanogel exhibit excellent stability to air/moisture and enhanced stability toward an aqueous solvent. The developed CsPbBr3-loaded MIP nanogels showed a selective and sensitive detection of ROX with a limit of detection calculated to be 1.7 × 10− 5 µg/mL (20.6 pM). The developed CsPbBr3-loaded MIP antioxidant-nanogels were evaluated on practical application for quantitative determination of ROX antibiotic in animal-derived food products with excellent analytical performance. The detection of ROX in animal-derived food products showed good recovery results making them an ideal candidate for sensing ROX.

Multi-capillary based optical sensors for highly sensitive protein detection

2017 ◽  
Author(s):  
Yasuhira Okuyama ◽  
Takashi Katagiri ◽  
Yuji Matsuura
Keyword(s):  
Optical Sensors ◽  
Protein Detection ◽  
Highly Sensitive

scholarly journals Multi-layer Laser Mirrors for Optical Sensors Deposited by Electron Beam Deposition and Ion Assisted Electron Beam Deposition

2021 ◽  
Vol 10 (3) ◽  
pp. 249-255
Author(s):  
Laxminarayana Gangalakurti ◽  
K Venugopal Reddy ◽  
I M Chhabra
Keyword(s):  
Electron Beam ◽  
Optical Sensors ◽  
Optical Constants ◽  
Surface Scattering ◽  
Surface Finishing ◽  
Material Surface ◽  
Glass Substrates ◽  
High Reflectivity ◽  
Electron Beam Deposition ◽  
Beam Deposition

High reflectivity and low loss mirrors are very much essential for state-of art sensors like Ring Laser Gyroscopes widely used for navigation of moving platforms. Surface scattering is the main source of loss for the Laser mirrors of high reflectivity. Surface scattering also lead to coupling of back reflected light leading to dead band of optical sensors at low input rotation. Super polished glass substrates have been prepared from low expansion glass ceramic material. Surface roughness is achieved about 3-5Å (RMS value) for the ceramic glass substrates prior to thin film coating. The substrates are deposited with 41 alternative layers of SiO2 and Ta2O5 of Quarter-Wave optical thickness with Electron Beam Deposition (EBD) technique. Ion beam Assisted Electron Beam Deposition (IAEBD) is used for another batch of substrates to coat identical stack of layers on glass substrates of the same surface quality. The key process parameters of both the coating processes are presented. The optical constants of the films are evaluated with spectroscopic Ellipsometer from 400nm to 1600nm. Total Integrated Scattering is estimated from the achieved surface finishing of mirrors deposited. The multi-layer coatings are characterized with UV-Vis-IR Spectrophotometer and Cavity Ring Down(CRD) loss meter. The quantitative optical loss of the mirrors is measured at 45o angle of incidence with CRD loss meter. The merits of ion assisted EB process over simple EB coating processes are evaluated against optical constants of thin films and performances of mirrors. Fitness of the processes for realizing Laser mirrors for optical sensors at 632.8nm is evaluated.

Electrospun Nanofibrous Membranes for Highly Sensitive Optical Sensors

Nano Letters ◽  
2002 ◽  
Vol 2 (11) ◽  
pp. 1273-1275 ◽  
Author(s):  
Xianyan Wang ◽  
Christopher Drew ◽  
Soo-Hyoung Lee ◽  
Kris J. Senecal ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Highly Sensitive ◽  
Nanofibrous Membranes

scholarly journals Highly-sensitive anisotropic porous silicon based optical sensors

2012 ◽  
Author(s):  
Jesús Álvarez ◽  
Paolo Bettotti ◽  
Neeraj Kumar ◽  
Isaac Suárez ◽  
Daniel Hill ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Optical Sensors ◽  
Highly Sensitive ◽  
Silicon Based
Sign in / Sign up

Export Citation Format

Share Document