Electrical properties of conducting polypyrrole films functionalized with phthalocyanine
TL;DR: In this paper, polypyrrole films containing phthalocyanine were deposited by direct electrochemical deposition method using mixed solvent system (NMP:H 2 O) with H 2 SO 4 (0.1 M).
About: This article is published in Materials Letters.The article was published on 2001-04-01. It has received 19 citations till now. The article focuses on the topics: Phthalocyanine & Polypyrrole.
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TL;DR: In this paper, a cable-like morphology of the composite (PPy-MWNT) structures was characterized by elemental analysis, Fourier transform infrared, field-emission scanning electron microscope, thermal gravimetric analysis, X-ray photoelectron spectroscopy, and transmission electron microscope.
79 citations
TL;DR: In this article, the carbon monoxide (CO)-sensitive polypyrrole (PPy) was modified with ferrocene (Fc) by direct incorporation during polymerization so as to increase its sensitivity for CO gas sensor applications.
Abstract: Polypyrrole (PPy) was modified with ferrocene (Fc) by direct incorporation during polymerization so as to increase its sensitivity for carbon monoxide (CO) gas sensor applications. Synthesis was carried out by chemical oxidative polymerization in the presence of ferrocene using ferric chloride. The presence of these species in PPy was confirmed by different characterization techniques. The CO response measurements were carried out for the sensors fabricated in a surface cell mode with active PPy + Fc films by exposing to CO gas (300 ppm) at room temperature and it was found that the response as well as the recovery characteristics of these materials is very fast and dependent on the film composition. The response factor was found to be maximum for a 1.32 mol% Fc content in the polymer. These various results can be explained on the basis of interaction of CO molecules with Fe atoms of the ferrocene together with charge transfer interaction with the PPy chain.
72 citations
TL;DR: In this article, a polypyrrole (PPy) was chemically functionalized with 5,10,15,20-tetraphenyl-21H,23H-porphyrin iron(III) chloride (FeTPPCl) with special interest on noxious carbon monoxide (CO) gas in ppm level.
71 citations
TL;DR: In this article, PANI-CuPc, PPy-cuPc and PT-CuPC polymers were studied as chemical sensors by their response characteristics after exposure to various chemical vapors such as methanol, ammonia and nitrogen dioxide.
Abstract: The conducting polymers such as polyaniline, polypyrrole and polythiophene were functionalized with copper phthalocyanine using chemical oxidation method. The obtained polymers viz. PANI-CuPc, PPy-CuPc and PT-CuPc were studied as chemical sensors by their response characteristics after exposure to various chemical vapors such as methanol, ammonia and nitrogen dioxide. The results obtained showed that these polymers have moderate sensitivity towards the methanol as well as ammonia vapors whereas they show tremendous sensitivity towards nitrogen dioxide vapors. The sensitivity factor of as high as 50,000 was obtained for PT-CuPc polymers in nitrogen dioxide. In comparison to this, the sensitivity factors of about 100 and 40 were obtained, when these polymers were exposed to ammonia and methanol vapors. The very high selectivity towards the nitrogen dioxide was explained on the basis of charge transfer complex formed between, the phthalocyanine donor and nitrogen dioxide acceptor molecules. On the other hand, ammonia becomes a competing electron donor in CuPc containing conducting polymers. The very low response towards the methanol may be explained on the basis very little charge transfer / interaction between CuPc containing polymers and methanol. Thus, CuPc incorporated conducting polymers have much higher selectivity than their original homopolymer
65 citations
TL;DR: In this article, the morphological features and structural properties of polypyrrole/phthalocyanine hybrid films were investigated and compared to those of poly pyrrole films.
36 citations
References
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TL;DR: In this paper, the lattice mismatch theory was used to explain the molecular ordering of polypyrrole grown on polyethylene oxide (PEO) complexes, with lattice parameters of a = 6.11 A, b = 7.19 A and c = 16.31 A.
21 citations
TL;DR: In this article, the anisotropy of electrical conductivity has been studied in polypyrrole deposited on poly(ethylene oxide)-copper(II) chloride complex films deposited by the dip-coating technique.
11 citations
TL;DR: In this paper, the diffusion of sodium sulphate in dilute solutions of carboxymethylcellulose sodium salt (CMC) was studied using the porous frit technique.
Abstract: The diffusion of sodium sulphate in dilute solutions of carboxymethylcellulose sodium salt (CMC) was studied using the porous frit technique. It was found that at relatively low CMC concentrations, the diffusivity of sodium sulphate (D) is higher than that in water (D0); with increasing CMC concentration, the diffusivity of sodium sulphate decreases gradually and reaches a value lower than that in water. The relation between salt diffusivity ratio (D/D0) and CMC concentration (C) is represented by the equation: D/D0=a−bC. The effect of temperature on the diffusivity of sodium sulphate in CMC solutions was found to obey the Arrhenius equation with an activation energy of 2600 cal mol−1.
4 citations
TL;DR: In this paper, the electrochemical behavior of iron phthalocyanine (FeIIPc) films, supported on gold substrates, was studied in 3.5 M NaOH solution, using cyclic voltammetry and coupled “in situ” ESR and UV-visible spectroscopic techniques.
4 citations