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

Highly Sensitive Optical Sensors Using Electrospun Polymeric Nanofibrous Membranes

2001 ◽  
Vol 708 ◽  
Author(s):  
Xianyan Wang ◽  
Soo-Hyoung. Lee ◽  
Christopher Drew ◽  
Kris J. Senecal ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Sensors ◽  
Polyacrylic Acid ◽  
Covalent Attachment ◽  
Layer By Layer ◽  
Electrospun Membrane ◽  
Surface Areas ◽  
Highly Sensitive ◽  
Electrospun Membranes ◽  
Nanofibrous Membranes

ABSTRACTIn recent years, polymer films have found an increasing role in sensors due to their unique characteristics. It is widely accepted that the sensitivity of a film is proportional to the surface area per unit mass. Thin films with very large surface areas can be easily fabricated by electrospinning, wherein a polymer solution is exposed to a high static voltage, creating sub-micron or nanometer scale fibers collected as a non-woven membrane. Electrospun nanofibrous membranes have surface areas approximately one to two orders of the magnitude higher than those found in continuous thin films. It is expected that their sensitivities are potentially as large. In this paper, the first use of an electrospun membrane as a highly responsive fluorescence quenching-based optical sensor is reported. A new fluorescent polymer, polyacrylic acid - poly (pyrene methanol) (PAA-PM), was synthesized via covalent attachment of the fluorescent indicator, pyrene methanol (PM), onto polyacrylic acid (PAA). Optical chemical sensors were then fabricated by electrospinning PAA-PM and thermal crosslinkable polyurethane latex mixture solutions. The synthesis, characterization, electrospinning fabrication, and comparison of the sensitivities to analytes such as ferric ions, mercury, and 2,4-dinitrotoluene between the electrospun membranes and electrostatically layer-by-layer (ELBL) assembled films are presented.

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

Ultrathin Nanofibrous Membranes Containing Insulating Microbeads for Highly Sensitive Flexible Pressure Sensors

2020 ◽  
Vol 12 (11) ◽  
pp. 13348-13359 ◽  
Author(s):  
Taiyu Jin ◽  
Yan Pan ◽  
Guk-Jin Jeon ◽  
Hye-In Yeom ◽  
Shuye Zhang ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Highly Sensitive ◽  
Nanofibrous Membranes ◽  
Flexible Pressure Sensors

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 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.

scholarly journals Novel Multifunctional Luminescent Electrospun Fluorescent Nanofiber Chemosensor-Filters and Their Versatile Sensing of pH, Temperature, and Metal Ions

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1259 ◽  
Author(s):  
Bo-Yu Chen ◽  
Yen-Chen Lung ◽  
Chi-Ching Kuo ◽  
Fang-Cheng Liang ◽  
Tien-Liang Tsai ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Color Change ◽  
Ethylenediaminetetraacetic Acid ◽  
Fluorescence Emission ◽  
Volume Ratio ◽  
High Sensitivity ◽  
Electrospinning Process ◽  
Solution Temperature ◽  
Highly Sensitive ◽  
Nanofibrous Membranes

Novel multifunctional fluorescent chemosensors composed of electrospun (ES) nanofibers with high sensitivity toward pH, mercury ions (Hg2+), and temperature were prepared from poly(N-Isopropylacrylamide-co-N-methylolacrylamide-co-rhodamine derivative) (poly(NIPAAm-co-NMA-co-RhBN2AM)) by employing an electrospinning process. NIPAAm and NMA moieties provide hydrophilic and thermo-responsive properties (absorption of Hg2+ in aqueous solutions), and chemical cross-linking sites (stabilization of the fibrous structure in aqueous solutions), respectively. The fluorescent probe, RhBN2AM is highly sensitive toward pH and Hg2+. The synthesis of poly(NIPAAm-co-NMA-co-RhBN2AM) with different compositions was carried on via free-radical polymerization. ES nanofibers prepared from sensory copolymers with a 71.1:28.4:0.5 NIPAAm:NMA:RhBN2AM ratio (P3 ES nanofibers) exhibited significant color change from non-fluorescent to red fluorescence while sensing pH (the λPL, max exhibited a 4.8-fold enhancement) or Hg2+ (at a constant Hg2+ concentration (10−3 M), the λPL, max of P3-fibers exhibited 4.7-fold enhancement), and high reversibility of on/off switchable fluorescence emission at least five times when Hg2+ and ethylenediaminetetraacetic acid (EDTA) were sequentially added. The P3 ES nanofibrous membranes had a higher surface-to-volume ratio to enhance their performance than did the corresponding thin films. In addition, the fluorescence emission of P3 ES nanofibrous membranes exhibited second enhancement above the lower critical solution temperature. Thus, the ES nanofibrous membranes prepared from P3 with on/off switchable capacity and thermo-responsive characteristics can be used as a multifunctional sensory device for specific heavy transition metal (HTM) in aqueous solutions.

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
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