ZnO-nanowires modified polypyrrole films as highly selective and sensitive chlorine sensors

Joshi, A.; Aswal, D. K.; Gupta, S. K.; Yakhmi, J. V.; Gangal, S. A.

doi:10.1063/1.3093499

Cited by 55 publications

(34 citation statements)

References 19 publications

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“…PAni/α-Fe 2 O 3 , several new planes were evidenced. The other peaks of PAni/α-Fe 2 O 3 5 composite were similar to the peaks observed in XRD pattern of α-Fe 2 O 3 27 , confirming the type of α-Fe 2 O 3 crystal structure which was well-maintained after preparing composite in base media. XRD pattern of α-Fe 2 O 3 is shown in Fig.1(b).…”

Section: Characterizations and Gas Sensing Measurementssupporting

confidence: 76%

“…In general, 25 gas sensors require high temperature to operate effectively and efficiently (>200°C). [4][5][6] Their advantages include low cost, flexibility in design, tunability, low power consumption and 35 excellent performance at room temperature 7, 8 etc. 2 So fabricating a sensor, operating at lowtemperature i.e.…”

Section: Introductionmentioning

confidence: 99%

“…3 Most of the conducting polymers (e.g. 27 In the present study, PAni was functionalized with α-Fe 2 O 3 to acclimatize its structural properties and to boost its gas sensing performance in order to induce stronger and faster chemical 5 reactions between PAni sensor and target gas. demonstrate potential gas sensing properties.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

et al. 2015

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A novel flexible, ultra-sensitive, selective, and room temperature operable polyaniline/iron-oxide (PAni/α-Fe 2 O 3 ) nanocomposite 5 ammonia (NH 3 ) gas sensor was developed onto a flexible polyethylene terephthalate (PET) substrate by in-situpolymerization process.The observations were recorded to 100ppm fixed level for various gases including NO 2, CH 3 OH, C 2 H 5 OH, NH 3 , and H 2 S through monitoring the change in resistance of the developed sensor. The flexible PAni/α-Fe 2 O 3 nanocomposite sensor demonstrated better selectivity towards NH 3 (response = 39% and stability = 74%). The synergistic response of the flexible PAni/α-Fe 2 O 3 sensor was remarkable than that of the PAni and α-Fe 2 O 3 alone; indicating the effective improvement in the performance of PAni flexible sensor on 10 nanocomposite process. Moreover, the flexible sensor detected NH 3 at low concentration (5ppm) with a fast response (27s) and very short recovery time (46s). Further, PAni/α-Fe 2 O 3 flexible sensor films were characterized by X-ray diffraction, field-emission scanning electron microscopy, UV-visible and Raman spectroscopy, Fourier transform infrared and X-ray photoelectron for structural analysis, morphological evolution, optical and surface related studies. 15

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Section: Characterizations and Gas Sensing Measurementssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

et al. 2015

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“…Next, the substrate was nanowires, which may increase the ionic interactions between ZnO and the anions which in turn led to longer exchange times. [35] It is worth noting that ZnO/PEDOT-Im samples showed very similar wetting changes compared to recently reported electrochemically adjustable ZnO surfaces. [36] But here, the changes in wetting were obtained by anion exchange reactions that did not require additional equipment like electrical current sources.…”

Section: Application Of Pedot-im In Surfaces With Switchable Wettabilitymentioning

confidence: 73%

Multiresponsive PEDOT–Ionic Liquid Materials for the Design of Surfaces with Switchable Wettability

Döbbelin

Tena‐Zaera

Marcilla

et al. 2009

Adv Funct Materials

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Among the different types of stimuli‐responsive polymers, conjugated polymers reveal unique multiresponsive behavior. In this work, the synthesis and characterization of new functional poly(3,4‐ethylenedioxythiophenes) (PEDOT) bearing imidazolium ionic‐liquid moieties (PEDOT‐Im) is reported. PEDOT‐Im polymers show multiresponsive properties to a variety of stimuli, such as temperature, pH, oxidative doping, and presence of anions. These stimuli provoke different changes in PEDOT‐Im, such as changes in color, oxidation state, and, wetting behavior. In all cases, a reversible effect is observed, and the polymers reveal responsive properties in solution as well as in the form of thin films. Whereas sensitiveness to pH and oxidative doping are known phenomena for other PEDOT derivatives, responsiveness to temperature and to anions is a unique property of PEDOT‐Im. The anion exchange is further investigated by means of the Quartz Crystal Microbalance with dissipation. Anion exchanges induce fast, adjustable, and reversible contact angle changes between 24° and 107°. As a potential application, surfaces with switchable wettability triggered by anion solutions are prepared by spin‐coating PEDOT‐Im films onto different substrates.

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“…The characteristic peak at 734 nm, related to the polaron and bipolaron band transitions [46], has been shifted to 693 nm after exposure to the ethanol environment. It is believed that the shifting of absorption peak to the lower wavelengths is indicative of poor conjugation [47], which can consequently result in a lower conductivity for the polymer sample. This is in accordance to the observed trend for PPy-based sensor showing a declined conductivity in presence of alcohol vapors.…”

Section: Electronic Transport Propertiesmentioning

confidence: 99%

Alcohol Sensibility of One-Dimensional Polyaniline and Polypyrrole Nanostructures

Joulazadeh

Navarchian

2015

IEEE Sensors J.

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This paper addresses the preparation of onedimensional nanostructured polyaniline (PANI) and polypyrrole (PPy). The Fourier transform infrared spectroscopy was used to characterize the chemical structure of the samples. The morphology of the samples was investigated by scanning electron microscopy and transmission electron microscopy. A nanofibrillar morphology was observed for the synthesized PANI and a nanotubular structure was obtained in the case of PPy. The alcohol sensing behaviors of PANI and PPy nanostructures were investigated for methanol, ethanol, propanol, and butanol, and the sensing mechanism of these systems has been discussed in detail. Both PANI and PPy systems were capable of detecting very low alcohols concentration (as low as 3 ppm) and demonstrated a linear behavior with a fast response/recovery performance especially in the case of ethanol vapor. The PPy-based sensor showed a better cyclability in response as compared with PANI when exposed to ethanol atmosphere. The surface characteristics of the PANI and PPy sensitive layers were investigated via atomic force microscopy. Ultraviolet-visible spectroscopy was used to study the effect of alcohol exposure on the electronic transport properties of nanostructured PANI and PPy layers.

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ZnO-nanowires modified polypyrrole films as highly selective and sensitive chlorine sensors

Cited by 55 publications

References 19 publications

Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

Multiresponsive PEDOT–Ionic Liquid Materials for the Design of Surfaces with Switchable Wettability

Alcohol Sensibility of One-Dimensional Polyaniline and Polypyrrole Nanostructures

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