Significant enhancement in the hydrogen-sensing performance of polypyrrole/titanium oxide (PPy/TiO2) hybrid sensors by a chemical oxidation polymerization approach

2020 ◽  
Vol 31 (11) ◽  
pp. 8183-8193 ◽  
Author(s):  
M. Kumaresan ◽  
M. Venkatachalam ◽  
M. Saroja ◽  
P. Gowthaman
Keyword(s):  
Titanium Oxide ◽  
Chemical Oxidation ◽  
Significant Enhancement ◽  
Hydrogen Sensing ◽  
Chemical Oxidation Polymerization ◽  
Hybrid Sensors ◽  
Sensing Performance

Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite

2014 ◽  
Vol 70 (4) ◽  
pp. 678-684 ◽  
Author(s):  
Jun Chen ◽  
Xiaoqin Hong ◽  
Yongteng Zhao ◽  
Qianfeng Zhang
Keyword(s):  
Adsorption Capacity ◽  
Chemical Oxidation ◽  
Maximum Adsorption Capacity ◽  
Isothermal Model ◽  
Adsorption Characteristic ◽  
In Situ Chemical Oxidation ◽  
Acid Copolymer ◽  
Chemical Oxidation Polymerization ◽  
Effects Of Ph ◽  
Pseudo Second Order

Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the surface of the clay platelets, which can be used as a dopant of PANI and play a ‘bridge’ role to combine PANI with clay. Adsorption experiments were carried out to study the effects of pH, contact time, Cr(VI) concentration, adsorbent dose and temperature. The adsorption of Cr(VI) on the PANI/MMT was highly pH dependent and the adsorption kinetics followed a pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity increased with the increase in temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent – liquid interface. The maximum adsorption capacity of the PANI/MMT composites for Cr(VI) was 308.6 mg/g at 25 °C. The excellent adsorption characteristic of exfoliated PANI/MMT composites will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.

Hydrogen sensing performance investigations with optical heating and sensing element surface modification

2021 ◽  
Vol 46 (1) ◽  
pp. 1411-1419
Author(s):  
Zhuang Ye ◽  
Zhi Li ◽  
Jixiang Dai ◽  
Yuhuan Qin ◽  
Gaopeng Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Sensing Element ◽  
Hydrogen Sensing ◽  
Optical Heating ◽  
Sensing Performance

On-chip growth of patterned ZnO nanorod sensors with PdO decoration for enhancement of hydrogen-sensing performance

2017 ◽  
Vol 42 (25) ◽  
pp. 16294-16304 ◽  
Author(s):  
Mingzhi Jiao ◽  
Nguyen Van Duy ◽  
Nguyen Viet Chien ◽  
Nguyen Duc Hoa ◽  
Nguyen Van Hieu ◽  
...  
Keyword(s):  
Zno Nanorod ◽  
Hydrogen Sensing ◽  
On Chip ◽  
Sensing Performance

scholarly journals Influence of Nb-doping on Hydrogen Sensing Performance of WO 3 Nanowires

2016 ◽  
Vol 168 ◽  
pp. 317-320 ◽  
Author(s):  
D. Zappa ◽  
A. Bertuna ◽  
E. Comini ◽  
N. Poli ◽  
G. Sberveglieri
Keyword(s):  
Hydrogen Sensing ◽  
Nb Doping ◽  
Sensing Performance

SYNTHESIS AND ELECTRORHEOLOGY OF PHOSPHORIC ACID DOPED POLYANILINE SUSPENSIONS

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1149-1155 ◽  
Author(s):  
C. H. HONG ◽  
H. J. CHOI
Keyword(s):  
Phosphoric Acid ◽  
Electric Fields ◽  
Chemical Structure ◽  
Chemical Oxidation ◽  
Chemical Oxidation Polymerization ◽  
Ft Ir ◽  
Fourier Transform Ir ◽  
Doped Polyaniline ◽  
Er Fluids ◽  
High Voltage Generator

Semiconducting phosphoric acid doped polyaniline ( PANI-H 3 PO 4) particles were synthesized by chemical oxidation polymerization, and their chemical structure and particle size were examined via Fourier transform IR spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. Electrorheological (ER) fluids were prepared by dispersing the synthesized PANI-H 3 PO 4 particles in kerosine, and their steady shear rheological properties under applied electric fields were investigated using a rotational rheometer with a high-voltage generator. The PANI-H 3 PO 4 synthesized in this study possesses a typical ER behavior: large increase of shear stress with applied electric field strengths.

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