Ion Beam Modified Conducting Polymer Composites: Material for Gas Sensing

2005 ◽  
Vol 889 ◽  
Author(s):  
Virendra Singh ◽  
Manindar Kaur ◽  
Tejvir Singh ◽  
Amita Chandra ◽  
Alok Srivastava
Keyword(s):  
Gas Sensing ◽  
Ion Beam ◽  
Composite Films ◽  
Casting Method ◽  
Free Standing ◽  
Ammonia Gas ◽  
Conducting Composite ◽  
Sensor Material ◽  
Solution Casting Method ◽  
Conducting Polymer Composites

AbstractA polyaniline based conducting composite was prepared by oxidative polymerisation of aniline in presence of polyvinylchloride (PVC) matrix. The coherent free standing thin films of the composite were prepared by solution casting method. The PVC-polyaniline composite (90:10) of thickness 40 μm was irradiated with 90 MeV C5+ ions at different ion fluence ranging 5× 1011-5× 1013 ions/cm2. The changes in resistance of pristine and irradiated composite in presence of ammonia gas were studied. A general decrease in surface resistance is observed upon irradiation. The sensitivity, response time and recovery time were studied as a function of ion fluence on exposing the sensor material to ammonia gas at ambient condition. It is observed that irradiated composite films are more sensitive and fast in response to ammonia gas. The preliminary results observed are encouraging.

scholarly journals Ammonia Gas Sensing Characteristic of P3HT-rGO-MWCNT Composite Films

2021 ◽  
Vol 11 (15) ◽  
pp. 6675
Author(s):  
Tran Si Trong Khanh ◽  
Tran Quang Trung ◽  
Le Thuy Thanh Giang ◽  
Tran Quang Nguyen ◽  
Nguyen Dinh Lam ◽  
...  
Keyword(s):  
Response Time ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Composite Films ◽  
Weight Ratio ◽  
Film Surface ◽  
Relative Sensitivity ◽  
Ammonia Gas ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotubes

In this work, the P3HT:rGO:MWCNTs (PGC) nanocomposite film applied to the ammonia gas sensor was successfully fabricated by a drop-casting technique. The results demonstrated that the optimum weight ratio of the PGC nanocomposite gas sensor is 20%:60%:20% as the weight ratio of P3HT:rGO:MWCNTs (called PGC-60). This weight ratio leads to the formation of nanostructured composites, causing the efficient adsorption/desorption of ammonia gas in/out of the film surface. The sensor based on PGC-60 possessed a response time of 30 s, sensitivity up to 3.6% at ammonia gas concentration of 10 ppm, and relative sensitivity of 0.031%/ppm. These results could be attributed to excellent electron transportation of rGO, the main adsorption activator to NH3 gas of P3HT, and holes move from P3HT to the cathodes, which works as charge “nano-bridges” carriers of Multi-Walled Carbon Nanotubes (MWCNTs). In general, these three components of PGC sensors have significantly contributed to the improvement of both the sensitivity and response time in the NH3 gas sensor.

scholarly journals Polyarylene ether nitrile and boron nitride composites: coating with sulfonated polyarylene ether nitrile

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Renbo Wei ◽  
Qian Xiao ◽  
Chenhao Zhan ◽  
Yong You ◽  
Xuefei Zhou ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Composite Films ◽  
Solution Casting ◽  
Casting Method ◽  
Polyarylene Ether Nitrile ◽  
Arylene Ether ◽  
Ultrasonic Technology ◽  
Solution Casting Method ◽  
Sulfonated Poly

AbstractBoron nitride (BN) coated with sulfonated poly-arylene ether nitrile (SPEN) (BN@SPEN) was used as additive to enhance the thermal conductivity of polyarylene ether nitrile. BN@SPEN was prepared by coating BN micro-platelets with SPEN through ultrasonic technology combined with the post-treatment bonding process. The prepared BN@SPEN was characterized by FTIR, TGA, SEM and TEM, which confirmed the successful coating of BN micro-platelets. The obtained BN@SPEN was introduced into the PEN matrix to prepare composite films by a solution casting method. The compatibility between BN and PEN matrix was studied by using SEM observation and rheology measurement. Furthermore, thermal conductivity of BN@SPEN/PEN films were carefully characterized. Thermal conductivity of BN@SPEN/PEN films was increased to 0.69 W/(m⋅K) at 20 wt% content of BN@SPEN, having 138% increment comparing with pure PEN.

scholarly journals Crystallization and Dielectric Properties of MWCNT /Poly(1-Butene) Composite Films by a Solution Casting Method

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 755
Author(s):  
Lingfei Li ◽  
Qiu Sun ◽  
Xiangqun Chen ◽  
Yongjun Xu ◽  
Zhaohua Jiang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Breakdown Strength ◽  
Composite Films ◽  
Conductive Filler ◽  
Interfacial Polarization ◽  
Solution Casting ◽  
Casting Method ◽  
Solution Casting Method

In this work, poly(1-butene) (PB-1) composite films with multi-walled carbon nanotubes (MWCNT) were prepared by a solution casting method. The relationship between the dielectric properties and the crystal transformation process of the films was investigated. It was indicated that there were two crystal forms of I and II of PB-1 during the solution crystallization process. With the prolongation of the phase transition time, form II was converted into form I. The addition of the conductive filler (MWCNT) accelerated the rate of phase transformation and changed the nucleation mode of PB-1. The presence of crystal form I in the system increased the breakdown strength and the dielectric constant of the films and reduced the dielectric loss, with better stability. In addition, the dielectric constant and the dielectric loss of the MWCNT/PB-1 composite films increased with the addition of MWCNT, due to the interfacial polarization between MWCNT and PB-1 matrix. When the mass fraction of the MWCNT was 1.0%, the composite film had a dielectric constant of 43.9 at 25 °C and 103 Hz, which was 20 times that of the original film.

Dielectric Properties of CCTO/PVDF Composite Films

2013 ◽  
Vol 816-817 ◽  
pp. 276-279 ◽  
Author(s):  
Fang Fang Wang ◽  
Ya Jun Wang ◽  
Zhi Bo Ren
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Composite Films ◽  
Solution Casting ◽  
Casting Method ◽  
Impedance Analyzer ◽  
Composite Models ◽  
Solution Casting Method ◽  
Pvdf Matrix ◽  
Ccto Powder

To meet the requirement of microelectronic industry, ceramic/polymer composite films made of CaCu3Ti4O12(CCTO) powder as filler and PVDF copolymer as matrix were prepared by solution casting method. The dielectric properties (DP) and morphology of the films were studied by impedance analyzer and scanning electron microscope (SEM) respectively. The dielectric constant could reach 23.96 and loss 0.1082 when mass fraction of CCTO is 50% at 100 Hz. SEM results show that CCTO particles dispersed well in the PVDF matrix. At last, three composite models were used to predict the dielectric constant of the composite films and it is proved that Yamada model fits the experimental data well.

A Study on Luminescence Enhancement in Ion Irradiated TiO2/Poly(methyl methacrylate) Nanocomposites

2012 ◽  
Vol 585 ◽  
pp. 139-143 ◽  
Author(s):  
Sarla Sharma ◽  
Rishi Vyas ◽  
Y.K. Vijay
Keyword(s):  
Methyl Methacrylate ◽  
Ion Beam ◽  
Visible Region ◽  
Heavy Ion ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Poly Methyl Methacrylate ◽  
Swift Heavy Ion ◽  
Vis Spectroscopy ◽  
Solution Casting Method

Swift heavy ion induced modification in the optical properties of TiO2/Poly (Methyl methacrylate) nanocomposites is reported in this paper. The as prepared anatase TiO2 nanoparticles were uniformly dispersed in PMMA matrix using solution casting method. These nanocomposites were then irradiated with Ag+12 (120 MeV) ion beam and characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, PL and Raman spectroscopy. The PL spectra exhibited an enhanced broad emission peak in visible region (400 nm - 750 nm) while UV-Vis spectroscopy revealed an increased absorption in visible region in irradiated specimen in comparison to unirradiated sample.

Gamma irradiation studies of composite thin films of poly vinyl alcohol and coumarin

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1554-1561 ◽  
Author(s):  
Feroz A. Mir ◽  
Adil Gani ◽  
K. Asokan
Keyword(s):  
Thin Films ◽  
Gamma Irradiation ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Solution Casting ◽  
Casting Method ◽  
Composite Thin Films ◽  
Solution Casting Method

Composite films of imperatorin (a coumarin molecule) and poly vinyl alcohol (PVA) are prepared by a solution casting method.

scholarly journals Synthesis and characterization of multifunctional ZnBr2/PVA polymer dielectrics

2016 ◽  
Vol 06 (04) ◽  
pp. 1650028 ◽  
Author(s):  
Jagadish Naik ◽  
R. F. Bhajantri ◽  
Sunil G. Rathod ◽  
T. Sheela ◽  
V. Ravindrachary
Keyword(s):  
Physical Phenomenon ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Cyclic Voltammograms ◽  
Free Standing ◽  
Dielectric Parameters ◽  
Weight Percentage ◽  
Coordination Sites ◽  
Segmental Relaxation ◽  
Solution Casting Method

Different weight percentage of ZnBr2 doped poly(vinyl alcohol) (PVA) free standing composite films were prepared using solution casting method. These films were characterized for analyzing structural, dielectric, electrochemical properties. This paper mainly focused to understand the contribution of physical phenomenon on conductivity in terms of dielectric parameters. FTIR spectrum confirms the interaction between ZnBr2 and PVA. Pseudo-capacitive behavior observed from cyclic voltammograms. Dielectric properties of the composites follow non-Debye type behavior. The conducting phenomenon occurs due to hopping of ions between coordination sites present in the composite and the segmental relaxation of polymer chain.

Prepare and Performance Research on PVA/TiO2 Composite Films

2011 ◽  
Vol 239-242 ◽  
pp. 2342-2345 ◽  
Author(s):  
Xi Hai Hao ◽  
Fei Li
Keyword(s):  
Light Transmission ◽  
Transmission Rate ◽  
Composite Films ◽  
Casting Method ◽  
Water Tolerance ◽  
Bonding Interaction ◽  
Solution Casting Method ◽  
Ft Ir ◽  
And Performance ◽  
Performance Research

Polyviny alcohol (PVA)/ Titanium dioxide (TiO2) composite films with diffrernt content of nano- TiO2were prepared by solution casting method. The structure of the film was characterized by FT-IR,and the water tolerance, viscosity, and light transmission rate of composite membrane were tested. The results showed that Nanometer TiO2 had strong hydrogen bonding interaction with PVA molecules, and with the increasing additive amount of nanometer TiO2, water resistance was improved, the viscosity of the composite sol rised, and the rate of UV transmission decreased obviously.

Factors Influencing Dielectric Properties of A-171@CCTO/PVDF Composite Films

2014 ◽  
Vol 1035 ◽  
pp. 413-416
Author(s):  
Jian Wen Zhai ◽  
Ya Jun Wang ◽  
Fu Yang Li ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Properties ◽  
Polyvinylidene Fluoride ◽  
High Dielectric Constant ◽  
Ethanol Concentration ◽  
Composite Films ◽  
Casting Method ◽  
Low Dielectric ◽  
Transmission Electron ◽  
Solution Casting Method ◽  
High Dielectric

Current research efforts toward achieving ceramic/polymer composites which fulfill the balance between sufficiently high dielectric constant (ε) and low dielectric loss (tanδ) are presented. In this paper, ceramic/polymer composite films made of CaCu3Ti4O12(CCTO) powder as filler, which is modified by silane coupling agent vinyltrimethoxysilane (A-171), and polyvinylidene fluoride (PVDF) copolymer as matrix were prepared by solution casting method. The morphology and dielectric properties (DP) were studied by transmission electron microscopy (TEM) and impedance analyzer. The effect of pH and ethanol concentration on the dielectric properties of A-171@CCTO/PVDF were studied. The results show that constant could reach 54.17 and loss 0.05 when mass fraction of A-171 is 0.4% at 1 kHz. pH=4 and using anhydrous ethanol are the optimal conditions.

Electrostriction of Dielectric Elastomer Based on Natural Rubber/Graphene Composites for Actuator Applications

2018 ◽  
Vol 879 ◽  
pp. 32-40 ◽  
Author(s):  
Darika Jaaoh ◽  
Roseleena Jarawae ◽  
Maimoon Intan ◽  
Huseng Chaidana
Keyword(s):  
Electric Field ◽  
Natural Rubber ◽  
Composite Films ◽  
Interfacial Polarization ◽  
Dielectric Elastomer ◽  
Solution Casting ◽  
Electromechanical Properties ◽  
Casting Method ◽  
Solution Casting Method ◽  
Electric Field Induced Strain

The combination of elastic natural rubber (NR) and conductive graphene were assessed for such improved electromechanical properties that are promising material in an actuator applications. For this work, dielectric elastomer composite films were prepared with varied graphene contents. These films were fabricated by solution casting method. The morphology along with electrical and mechanical properties, and specifically the electrostrictive coefficient, were studied. The electrostrictive behavior was determined from electric field induced strain, observed with a photonic displacement apparatus in the film thickness direction. It is shown that the electrostrictive coefficient for the NR/Graphene composite has already raised over 3.7 times compared to the neat natural rubber by the reason of an interfacial polarization. The surface between NR matrix and graphene filler generates the larger permittivity. Meanwhile, the Young's modulus was quite invariant. Consequently, the enlarging of the electrostrictive coefficient under low electric field of the NR/Graphene composites is representing a potentially good actuation response base on the electrostriction phenomena.

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