Au–TiO2-Loaded Cubic g-C3N4 Nanohybrids for Photocatalytic and Volatile Organic Amine Sensing Applications

2018 ◽  
Vol 10 (40) ◽  
pp. 34087-34097 ◽  
Author(s):  
Ritu Malik ◽  
Vijay K. Tomer ◽  
Nirav Joshi ◽  
Torben Dankwort ◽  
Liwei Lin ◽  
...  
Keyword(s):  
Organic Amine ◽  
Sensing Applications ◽  
Volatile Organic

scholarly journals A Simple Optical Model for the Swelling Evaluation in Polymer Nanocomposites

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
Anna De Girolamo Del Mauro ◽  
Angelica Immacolata Grimaldi ◽  
Vera La Ferrara ◽  
Ettore Massera ◽  
Maria Lucia Miglietta ◽  
...  
Keyword(s):  
Carbon Black ◽  
Polymer Nanocomposites ◽  
Optical Model ◽  
Gas Sensing ◽  
Polymer Nanocomposite ◽  
Operating Conditions ◽  
Hydroxyethyl Methacrylate ◽  
White Light Interferometry ◽  
Sensing Applications ◽  
Volatile Organic

In the present study, we report on a simple optical method based on thin film interferometry for the swelling evaluation in polymer nanocomposite layers used for gas sensing applications. We show that white light interferometry can be profitably applied to characterize scattering materials such as polymer/carbon black nanocomposites. A properly adjusted experimental setup was implemented to monitor the swelling behavior of the sensitive films in real device operating conditions. In particular, the behavior of poly(2-hydroxyethyl methacrylate) (PHEMA) and of carbon black/PHEMA nanocomposite layers, used for volatile organic compounds (VOCs) detection, was investigated and measured under ethanol vapors exposure (max 1%). The method is very sensitive and the swelling in the range of only few nanometers can be measured. Interestingly, we have found that the nanocomposite undergoes a more pronounced swelling process with respect to pristine polymer. Ethanol diffusion coefficients in the nanocomposite were evaluated.

scholarly journals Highly Sensitive Sensors Based on Photonic Crystal Fiber Modal Interferometers

2009 ◽  
Vol 2009 ◽  
pp. 1-11 ◽  
Author(s):  
Joel Villatoro ◽  
Vittoria Finazzi ◽  
Gonçal Badenes ◽  
Valerio Pruneri
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Thermal Sensitivity ◽  
Post Processing ◽  
Crystal Fiber ◽  
Sensing Applications ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Processing Techniques ◽  
Highly Sensitive Sensors

We review the research on photonic crystal fiber modal interferometers with emphasis placed on the characteristics that make them attractive for different sensing applications. The fabrication of such interferometers is carried out with different post-processing techniques such as grating inscription, tapering or cleaving, and splicing. In general photonic crystal fiber interferometers exhibit low thermal sensitivity while their applications range from sensing strain or temperature to refractive index and volatile organic compounds.

scholarly journals Optical Fiber Sensors Based on Microstructured Optical Fibers to Detect Gases and Volatile Organic Compounds—A Review

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2555
Author(s):  
Diego Lopez-Torres ◽  
Cesar Elosua ◽  
Francisco J. Arregui
Keyword(s):  
Volatile Organic Compounds ◽  
Optical Fiber ◽  
Organic Compounds ◽  
Optical Fibers ◽  
Direct Interaction ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Microstructured Optical Fibers ◽  
Sensing Applications ◽  
Volatile Organic

Since the first publications related to microstructured optical fibers (MOFs), the development of optical fiber sensors (OFS) based on them has attracted the interest of many research groups because of the market niches that can take advantage of their specific features. Due to their unique structure based on a certain distribution of air holes, MOFs are especially useful for sensing applications: on one hand, the increased coupling of guided modes into the cladding or the holes enhances significantly the interaction with sensing films deposited there; on the other hand, MOF air holes enhance the direct interaction between the light and the analytes that get into in these cavities. Consequently, the sensitivity when detecting liquids, gasses or volatile organic compounds (VOCs) is significantly improved. This paper is focused on the reported sensors that have been developed with MOFs which are applied to detection of gases and VOCs, highlighting the advantages that this type of fiber offers.

scholarly journals Chemical sensor based on a solid-core photonic crystal fiber interferometer

2019 ◽  
Vol 13 (27) ◽  
pp. 127-143
Author(s):  
Rawaa K. Zarzoor
Keyword(s):  
Photonic Crystal ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Photonic Crystal Fiber ◽  
Chemical Sensor ◽  
Pump Light ◽  
Solid Core ◽  
Crystal Fiber ◽  
Sensing Applications ◽  
Volatile Organic

Photonic crystal fiber interferometers are used in many sensing applications. In this work, an in-reflection photonic crystal fiber (PCF) based on Mach-Zehnder (micro-holes collapsing) (MZ) interferometer, which exhibits high sensitivity to different volatile organic compounds (VOCs), without the needing of any permeable material. The interferometer is robust, compact, and consists of a stub photonic crystal fiber of large-mode area, photonic crystal fiber spliced to standard single mode fiber (SMF) (corning-28), this splicing occurs with optimized splice loss 0.19 dB In the splice regions the voids of the holey fiber are completely collapsed, which allows the excitation and recombination of core and cladding modes. The device reflection spectrum exhibits a sinusoidal interference pattern which shifts differently when the voids of the PCF are infiltrated with VOC molecules. The volume of voids responsible for the shift is less than 5microliters whereas the detectable levels are in the nanomole range. Laser diode with a wavelength 1550nm has been used as a pump light source. Two types of chemical liquids used (N-Hexane, and Propanol). The detection limits of our device associated with the maximum shifts of the wavelength is 4.4 nm for N-Hexane vapor when the length of the head sensor 20mm. In this work, the maximum sensitivity obtained of volatile organic compounds is 15420 nm/mol at the vapor of N-Hexane.

scholarly journals MagnetoPlasmonic Waves/HOMO-LUMO Free π-Electron Transitions Coupling in Organic Macrocycles and Their Effect in Sensing Applications

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 272
Author(s):  
Maria Grazia Manera ◽  
Gabriele Giancane ◽  
Simona Bettini ◽  
Ludovico Valli ◽  
Victor Borovkov ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Complex Refractive Index ◽  
Plasmon Energy ◽  
Detection Mechanism ◽  
Sensing Applications ◽  
Electron Transitions ◽  
Volatile Organic ◽  
Optical Transducers ◽  
Homo Lumo ◽  
Molecular Vapors

Optical and magneto-optical surface plasmon resonance (MOSPR) characterization and preliminary sensing test onto single- and multi-layers of two organic macrocycles have been performed; TbPc2(OC11H21)8 phthalocyanine and CoCoPo2 porphyrin were deposited by the Langmuir-Schäfer (LS) technique onto proper Au/Co/Au magneto-optical transducers. Investigations of the MOSPR properties in Kretschmann configuration by angular modulation, gives us an indication about the potential discrimination of two organic macrocycles with absorption electronic transition in and out of the propagating plasmon energy spectral range. An improved molecular vapors sensitivity increase by the MOSPR sensing probe can be demonstrated depending on the overlap between the plasmonic probe energy and the absorption electronic transitions of the macrocycles under investigation. If the interaction between the plasmon energy and molecular HOMO-LUMO transition is preserved, a variation in the complex refractive index takes place. Under this condition, the magneto-plasmonic effect reported as 1/|MOSPR| signal allows us to increase the detection of molecules deposited onto the plasmonic transducer and their gas sensing capacity. The detection mechanism appears strongly enhanced if the Plasmon Wave/HOMO-LUMO transitions energy are in resonance. Under coupling conditions, a different volatile organic compounds (VOC) sensing capability has been demonstrated using n-butylamine as the trial molecule.

Single-atom nanocatalysts for biosensing application

2022 ◽  
Vol 18 ◽  
Author(s):  
Xiaoxiao Ge ◽  
Zhifan Liu ◽  
Weiying Zhang ◽  
Shaojun Guo
Keyword(s):  
Active Sites ◽  
Simple Structure ◽  
Organophosphorus Pesticides ◽  
Environmental Pollutants ◽  
Single Atom ◽  
Research Progress ◽  
Sensing Applications ◽  
Volatile Organic ◽  
Activity Variable

Abstract: Single-atom (SA) catalysts, as a rising star in catalytic field, have many advantages over traditional nanocatalysts. The enhanced catalytic activity, variable and simple structure as well as clear active sites of SA catalysts advance the innovation of biosensing techniques. In this review, we will provide the latest research progress of SA catalysts in biosensing field, and systematically summarize their sensing applications, especially emphasing on the biosensing strategies on the determination of disease-related biological matrices (H2O2, biological enzyme, NO, etc) and environmental pollutants (organophosphorus pesticides, heavy metal ions and volatile organic compounds). Finally, we will provide the challenges that SA catalysts still faced.

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