Characteristics of the PPy Material as pH Sensitive Membrane

Wang, Zumin; Ren, Zhengxin; Jian-guo, Han; Bian, Chao; Xia, Shanhong

doi:10.1109/nems.2007.352039

Cited by 6 publications

(8 citation statements)

References 11 publications

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“…PPY thin films are also used in chemical sensors, presenting good sensitivity and linearity values . Two factors explain the low sensitivity of PPY homopolymer film as IA–EGFET sensor in this study: thicker films of PPY have lower sensitivity as solid‐state chemical sensors and the aqueous acid electrolyte used as polymerization solution medium is not the favorable one for PPY. PPY thin films presented better characteristics and properties when they are polymerized in organic acid medium .…”

Section: Resultsmentioning

confidence: 88%

“…PANI thin films are known as good chemically sensitive materials for chemical sensors . PPY thin films are also used in chemical sensors, presenting good sensitivity and linearity values . Two factors explain the low sensitivity of PPY homopolymer film as IA–EGFET sensor in this study: thicker films of PPY have lower sensitivity as solid‐state chemical sensors and the aqueous acid electrolyte used as polymerization solution medium is not the favorable one for PPY.…”

Section: Resultsmentioning

confidence: 89%

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PANI/PPY blend thin films electrodeposited for use in EGFET sensors

Mello

Mulato

2018

J of Applied Polymer Sci

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Galvanostatic electrodeposited thin films of polyaniline (PANI)/polypyrrole (PPY) blend were tested as chemical sensors and evaluated according to the relative monomer concentration in polymerization solution aiming to obtain a reliable reference field‐effect transistor able to be used as contrast sensing film. The blend material presented properties that can be controlled by the polymerization process. The films were produced using aniline (0.25 M) and pyrrole (0.25 M) mixed in five different proportions (90/10, 70/30, 50/50, 30/70, 10/90) with HCl (1.0 M) in an aqueous solution. The current density was 1 mA/cm2 for 300 s. The films were analyzed by their chronopotentiometric curves, thickness, reflectance spectroscopy, optical color parameters, and surface morphology. The characteristics and properties analyzed were correlated to the relative monomer concentration in the polymerization solution. The polymerization of PANI is favorable in aqueous acid solution compared to PPY, which resulted in thin films with properties varying from PANI down to PPY. The blend films presented controllable sensitivity when applied as sensing stage in field‐effect transistor devices as function of the relative monomer concentration. The sensitivity varied from 57 ± 1 mV/pH for the PANI sample, down to 25 ± 1 mV/pH for the PPY sample, presenting an exponential behavior. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46625.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 89%

PANI/PPY blend thin films electrodeposited for use in EGFET sensors

Mello

Mulato

2018

J of Applied Polymer Sci

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“…PPY thin films are also very used in chemical sensors, presenting good sensitivity and linearity values [98,99]. Two factors explain the low sensitivity of PPY homopolymer film as EGFET sensor in this study: thicker films of PPY have lower sensitivity as solid state chemical sensors [98] and the aqueous acid electrolyte used as polymerization solution medium is not the favourable one for PPY. PPY thin films presented better characteristics and properties when they are polymerized in organic acid medium [100].…”

Section: Pani/ppy Composite Thin Filmsmentioning

confidence: 82%

“…PANI thin films are known as good chemically-sensitive materials for chemical sensors [4,31]. PPY thin films are also very used in chemical sensors, presenting good sensitivity and linearity values [98,99]. Two factors explain the low sensitivity of PPY homopolymer film as EGFET sensor in this study: thicker films of PPY have lower sensitivity as solid state chemical sensors [98] and the aqueous acid electrolyte used as polymerization solution medium is not the favourable one for PPY.…”

Section: Pani/ppy Composite Thin Filmsmentioning

confidence: 87%

“…For galvanostatic electrodeposited PANI thin films applied as pH sensor, we have shown that the aniline monomer concentration is fundamental in the final sensitivity, and for higher monomer concentration, as 0.25 mol/L, there is a decrease in the sensitivity [97]. Also for PPY thin films applied as pH sensor, the sensitivity lies in the range of 32-53 mV/pH depending on the deposition process [98]. The obtained value of 25 mV/pH is justified by the polymerization conditions.…”

Section: Pani/ppy Composite Thin Filmsmentioning

confidence: 93%

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Solid-state biosensors and field-effect transistor devices based on organic semiconductors

Mello¹

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I would like to express my sincere and eternal gratitude to those who made this thesis possible. I am deeply grateful to my supervisor Professor Marcelo Mulato, who supported this work and encourage me to go beyond my own limits every second. His friendship made the path easier. I also express my gratitude to Professor Emil List-Kratochvil from Humboldt-Universität zu Berlin for receiving me on his laboratory. His warm welcome along with a dedicated guidance made my experience abroad enriching and fascinating, leading to excellent results.

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Microelectromechanical Sensors

Xia

Chen

et al. 2012

Microsystems and Nanotechnology

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Characteristics of the PPy Material as pH Sensitive Membrane

Cited by 6 publications

References 11 publications

PANI/PPY blend thin films electrodeposited for use in EGFET sensors

PANI/PPY blend thin films electrodeposited for use in EGFET sensors

Solid-state biosensors and field-effect transistor devices based on organic semiconductors

Microelectromechanical Sensors

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