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 Inkjet-Printing Polymer Nanocomposite for Detecting VOCs

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 882 ◽  
Author(s):  
Mohammad Madhi Kiaee ◽  
Thomas Maeder ◽  
Juergen Brugger
Keyword(s):  
Inkjet Printing ◽  
Gas Sensing ◽  
Polymer Nanocomposite ◽  
Solvent System ◽  
Solvent Mixture ◽  
Deionized Water ◽  
Polymer Content ◽  
Sensing Applications ◽  
Sensor Platform ◽  
High Structure

Polymer nanocomposite (PNC) inks containing polyvinylpyrrolidone with a molecular weight of 40 kDa (PVP40) and a high structure carbon black (CB) were formulated for gas sensing applications. The formulation was optimized for inkjet printing by using a co-solvent system and tuning the ink’s viscosity. The Ink loaded with 10 wt.% PVP40, dissolved in a solvent mixture containing 70 wt.% deionized water and 30 wt.% gamma-butyrolactone showed an excellent printability. Adding up to 13 wt.% CB particles to the ink, with respect to polymer content, did not affect its printability. Printing PNC onto the sensor platform and measuring its response towards ethanol, acetone and humidity showed the higher affinity of the PNC to humidity and ethanol.

Different Kinds of Carbon-Based Material for Resistive Gas Sensing

2013 ◽  
Vol 543 ◽  
pp. 269-272 ◽  
Author(s):  
Roman Bořuta ◽  
Robert Olejnik ◽  
Petr Slobodian ◽  
Pavel Riha
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Carbon Nanofibers ◽  
Gas Sensing ◽  
Resistance Increase ◽  
Gas Sensing Properties ◽  
Volatile Organic ◽  
Multi Walled Carbon Nanotubes ◽  
Measured Resistance ◽  
Walled Carbon Nanotubes

Gas sensing properties of networks made of carbon black, carbon nanofibers and carbon multi-walled carbon nanotubes are tested. The networks reaction to vapors of volatile organic compounds is measured through their change of electrical resistance. The measured resistance increase is up to 27.7 % for carbon black, 40% for carbon nanofibers and 47.7% for multi-walled carbon nanotubes.

Highly Flexible and Conducting Polymer Nanocomposite Films for Selective Gas Sensing Applications

2019 ◽  
Vol 9 ◽  
pp. 515-521
Author(s):  
Mahesh ◽  
K.M. Subbaiah ◽  
K.S. Nithin ◽  
B.M. Jagajeevan Raj ◽  
Sachhidananda Shivanna
Keyword(s):  
Conducting Polymer ◽  
Gas Sensing ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Sensing Applications ◽  
Conducting Polymer Nanocomposite

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.

Effect of Grain Size on Strain in a Copper Oxide Nanofilm for Gas Sensing Applications

2019 ◽  
Vol 11 (5) ◽  
pp. 05040-1-05040-4
Author(s):  
Sumanta Kumar Tripathy ◽  
◽  
Sanjay Kumar ◽  
Divya Aparna Narava ◽  
◽  
...  
Keyword(s):  
Grain Size ◽  
Copper Oxide ◽  
Gas Sensing ◽  
Sensing Applications

scholarly journals Optimization of a Low-Power Chemoresistive Gas Sensor: Predictive Thermal Modelling and Mechanical Failure Analysis

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 783 ◽  
Author(s):  
Andrea Gaiardo ◽  
David Novel ◽  
Elia Scattolo ◽  
Michele Crivellari ◽  
Antonino Picciotto ◽  
...  
Keyword(s):  
Low Power ◽  
Failure Analysis ◽  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
Mechanical Failure ◽  
Sensing Applications ◽  
Theoretical Approaches ◽  
Sensing Material ◽  
Silicon Bulk

The substrate plays a key role in chemoresistive gas sensors. It acts as mechanical support for the sensing material, hosts the heating element and, also, aids the sensing material in signal transduction. In recent years, a significant improvement in the substrate production process has been achieved, thanks to the advances in micro- and nanofabrication for micro-electro-mechanical system (MEMS) technologies. In addition, the use of innovative materials and smaller low-power consumption silicon microheaters led to the development of high-performance gas sensors. Various heater layouts were investigated to optimize the temperature distribution on the membrane, and a suspended membrane configuration was exploited to avoid heat loss by conduction through the silicon bulk. However, there is a lack of comprehensive studies focused on predictive models for the optimization of the thermal and mechanical properties of a microheater. In this work, three microheater layouts in three membrane sizes were developed using the microfabrication process. The performance of these devices was evaluated to predict their thermal and mechanical behaviors by using both experimental and theoretical approaches. Finally, a statistical method was employed to cross-correlate the thermal predictive model and the mechanical failure analysis, aiming at microheater design optimization for gas-sensing applications.

scholarly journals Recent Advances in the Synthesis of Polymer-Grafted Low-K and High-K Nanoparticles for Dielectric and Electronic Applications

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2942
Author(s):  
Bhausaheb V. Tawade ◽  
Ikeoluwa E. Apata ◽  
Nihar Pradhan ◽  
Alamgir Karim ◽  
Dharmaraj Raghavan
Keyword(s):  
Energy Density ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Breakdown Strength ◽  
Polymer Nanocomposite ◽  
High Energy ◽  
Polymer Chains ◽  
High Energy Density ◽  
Grafted Nanoparticles ◽  
Grafting From

The synthesis of polymer-grafted nanoparticles (PGNPs) or hairy nanoparticles (HNPs) by tethering of polymer chains to the surface of nanoparticles is an important technique to obtain nanostructured hybrid materials that have been widely used in the formulation of advanced polymer nanocomposites. Ceramic-based polymer nanocomposites integrate key attributes of polymer and ceramic nanomaterial to improve the dielectric properties such as breakdown strength, energy density and dielectric loss. This review describes the ”grafting from” and ”grafting to” approaches commonly adopted to graft polymer chains on NPs pertaining to nano-dielectrics. The article also covers various surface initiated controlled radical polymerization techniques, along with templated approaches for grafting of polymer chains onto SiO2, TiO2, BaTiO3, and Al2O3 nanomaterials. As a look towards applications, an outlook on high-performance polymer nanocomposite capacitors for the design of high energy density pulsed power thin-film capacitors is also presented.

scholarly journals Advanced development of metal oxide nanomaterials for H2 gas sensing applications

2021 ◽  
Author(s):  
Yushu Shi ◽  
Huiyan Xu ◽  
Tongyao Liu ◽  
Shah Zeb ◽  
Yong Nie ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
The Past ◽  
Sensing Applications ◽  
The Future ◽  
Metal Oxide Nanomaterials ◽  
Nanomaterials Synthesis ◽  
Advanced Development

The scheme of the structure of this review includes an introduction from the metal oxide nanomaterials’ synthesis to application in H2 gas sensors—a vision from the past to the future.

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