Highly Sensitive SOI Optical Sensors with Porous Si

2012 ◽  
Author(s):  
Zhixuan Xia ◽  
Murtaza Askari ◽  
Ali A. Eftekhar ◽  
Stanley C. Davis ◽  
Kenneth H. Sandhage ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Porous Si ◽  
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

Highly sensitive PtSi/porous Si Schottky detectors

2002 ◽  
Vol 2 (5) ◽  
pp. 476-481 ◽  
Author(s):  
F. Raissi ◽  
M.M. Far
Keyword(s):  
Porous Si ◽  
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.

Highly sensitive near IR detectors using n-type porous Si

2003 ◽  
Vol 104 (2) ◽  
pp. 117-120 ◽  
Author(s):  
Farshid Raissi ◽  
Naveed A. Sheeni
Keyword(s):  
Porous Si ◽  
Ir Detectors ◽  
Near Ir ◽  
Highly Sensitive

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

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

Reversible Luminescence Quenching of Porous Si by Solvents

1991 ◽  
Vol 256 ◽  
Author(s):  
Jeffrey M. Lauerhaas ◽  
Grace M. Credo ◽  
Julie L. Heinrich ◽  
Michael J. Sailor
Keyword(s):  
Dipole Moment ◽  
Charge Transfer ◽  
Diethyl Ether ◽  
Electron Donor ◽  
Surface Reaction ◽  
Methylene Chloride ◽  
Luminescence Quenching ◽  
Porous Si ◽  
Highly Sensitive ◽  
Surface Adsorbates

ABSTRACTInteraction of the solvents tetrahydrofuran, diethyl ether, methylene chloride, toluene, o-xylene, benzene, and methanol with luminescent porous n- Si (PS) results in reversible quenching of the luminescence associated with this material. The degree of quenching ranges from 99% – 50%, and scales with solvent dipole moment. Reaction with gaseous Cl2, Br2, or I2 results in irreversible quenching, associated with a surface reaction that removes Si-H bonds. Total luminescence quenching is observed on treatment of a PS wafer with a solution of the electron donor ferrocene in toluene, suggesting that charge transfer quenching may also be operative in this material. Luminescence is partially recovered by rinsing the PS in pure toluene. The data show that photoluminescence of PS is highly sensitive to surface adsorbates, suggesting that carrier trapping is easily induced in this material.

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