Electrochemical gas sensors based on polypyrrole-porous silicon

Tighilt, F.-Z.; Zane, Fawzi; Belhaneche‐Bensemra, Naïma; Belhousse, S.; Sam, S.; Gabouze, N.

doi:10.1016/j.apsusc.2012.10.080

Cited by 29 publications

(8 citation statements)

References 10 publications

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“…Measurements were carried out at room temperature. Pyrrole was in situ polymerized on the WO 3 film at a constant potential of 1.3 V with a charge density of 30 mC/cm 2 . Electrochemical characterizations of all prepared materials were made in monomer‐free IL solutions.…”

Section: Methodsmentioning

confidence: 99%

Fabricating polypyrrole/tungsten oxide hybrid based electrochromic devices using different ionic liquids

Dulgerbaki

Öksüz

2015

Polymers for Advanced Techs

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A facile approach of polypyrrole (PPy)/tungsten oxide (WO3) composites electrosynthesized in ionic liquids for fabrication of electrochromic devices is discussed. The electrochromic properties of PPy/tungsten oxide nanocomposite films (PPy/WO3) prepared in the presence of four different ionic liquids, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF4), 1‐butyl‐3‐methylimidazolium hexafluorophosphate (BMIMPF6), 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl) imide (BMIMTFSI), and 1‐butyl‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMPTFSI) were investigated in detail. Cyclic voltammetry results revealed that PPy/WO3 nanocomposite films have much more electrochemical activity than those of WO3 and PPy film. The electrochromic contrast, coloration efficiency, and switching speed of the composite films were determined for electrochromic characteristics. The maximum contrast and the maximum coloration efficiency values were measured as 33.25% and 227.89 cm2/C for the PPy/WO3/BMIMTFSI composite film. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Fabricating polypyrrole/tungsten oxide hybrid based electrochromic devices using different ionic liquids

Dulgerbaki

Öksüz

2015

Polymers for Advanced Techs

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“…The presence of metal at the polypyrrole surface or in polypyrrole matrices may greatly improve many polypyrrole properties. Properties of PPy that make it suitable for a variety of applications include its capacity to form adhesive coatings on different substrates, its good electronic conductivity, good chemical stability, good resistance to corrosion, and good porosity, which enables ion exchange with the surrounding medium . Recently, to improve magnetic, electrical, and optical properties, composites consisting of nanoparticles embedded in a conducting polymer matrix (such as PPy or polyaniline (PAni)) have attracted considerable interest .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electric properties of polypyrrole by copper electrodeposition

et al. 2015

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Polypyrrole films (0.2–1.0 μm thick) were electrosynthetized in organic media by potentiodynamic electropolymerization on silicon surfaces. To improve the electronic conductivity of the polypyrrole films, elemental copper was electrodeposited directly on the film surface by simple electrolysis from a copper chloride bath. Copper electrodeposited onto the surface of the polypyrrole film was characterized by X‐ray diffraction and consisted only of Cufcc phase. The presence of copper on the PPy surface did not greatly affect the overall electronic conductivity of the material. However, immersion of polypyrrole films in Cu2+ solution for a period of time caused Cu2+ ions to enter the polypyrrole matrix. The reduction of the Cu2+after insertion into the polypyrrole template formed a polypyrrole/Cu composite with high electrical conductivity; this conductivity was higher for longer steeping (immersion) time. Raman spectroscopy shows much greater peak intensities when copper was present in the polypyrrole matrix. Scanning electron microscopy and cross‐sectional analysis showed clear differences in the appearance of the films with copper deposited onto the polypyrrole surface and copper inserted into the polypyrrole matrix.

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“…Recently, there is a rising interest in functionalization of PS with a goal of improving sensor selectivity. Examples include polypyrrole-coated porous silicon surface in CO 2 detection ([27]), and TiO 2 functionalized PS in specific detection of alcohols ([28]).…”

Section: Introductionmentioning

confidence: 99%

Sensing Properties of Oxidized Nanostructured Silicon Surface on Vaporized Molecules

Baran

Gebavi

Mikac

et al. 2019

Sensors

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Porous silicon has been intensely studied for the past several decades and its applications were found in photovoltaics, biomedicine, and sensors. An important aspect for sensing devices is their long–term stability. One of the more prominent changes that occur with porous silicon as it is exposed to atmosphere is oxidation. In this work we study the influence of oxidation on the sensing properties of porous silicon. Porous silicon layers were prepared by electrochemical etching and oxidized in a tube furnace. We observed that electrical resistance of oxidized samples rises in response to the increasing ambient concentration of organic vapours and ammonia gas. Furthermore, we note the sensitivity is dependent on the oxygen treatment of the porous layer. This indicates that porous silicon has a potential use in sensing of organic vapours and ammonia gas when covered with an oxide layer.

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Electrochemical gas sensors based on polypyrrole-porous silicon

Cited by 29 publications

References 10 publications

Fabricating polypyrrole/tungsten oxide hybrid based electrochromic devices using different ionic liquids

Fabricating polypyrrole/tungsten oxide hybrid based electrochromic devices using different ionic liquids

Enhancement of electric properties of polypyrrole by copper electrodeposition

Sensing Properties of Oxidized Nanostructured Silicon Surface on Vaporized Molecules

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