Selective conductivity response of polypyrrole-based sensor on flammable chemicals

Ruangchuay, Ladawan; Sirivat, Anuvat; Schwank, Johannes W.

doi:10.1016/j.reactfunctpolym.2004.03.004

Cited by 37 publications

(23 citation statements)

References 11 publications

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“…XRD diffraction patterns are shown in Fig. 1, the interplanar spacings between the aromatic groups can be identified with the peaks corresponding to the dspacings of 3.4 and 3.6Å for the doped Ppy [3] and the undoped Ppy [32], respectively. For the undoped Ppy, the d-spacing at 4.5Å can be referred to the distance between neighboring pyrrole rings where the ␣-␣ linkages are single bond [33,34].…”

Section: Characterization Of Polypyrolementioning

confidence: 99%

“…Doped Ppy at various amounts of the dopant anion was chemically synthesized by the in situ doped oxidative coupling polymerization process according to the method of Ruangchuay [3]. A solution of 0.6846 g (3.0 mmol) of APS in 10.0 ml deionized water was slowly added to the mixture of 1.2 mmol of the dopant anion and 1.0 ml (14.5 mmol) of pyrrole monomers in 20.0 ml deionized water.…”

Section: Polymerization Of Polypyrrolementioning

confidence: 99%

“…For the highly doped polypyrrole, Ppy 1:6, the UV-vis absorption peaks at 411 nm can be assigned to the → * transition, and the peak at 706 nm can be identified as the bipolaron species [3]. For the undoped polypyrrole, Ppy ud, there is no UV-vis absorption peak appearing due to the partial solubility of the polymer.…”

Section: Characterization Of Polypyrolementioning

confidence: 99%

“…FTIR spectrum of Ppy ud shows absorption peaks at 2924, 1548, 1465, 1189, 965, and 795 cm −1 ; they can be assigned to the C-H stretching, the C C in pyrrole ring stretching, the N-H bending, the C-H in plane bending, and the C-H out of plane bending, respectively [1,3,9,[27][28][29]. For Ppy 1:6, the absorption peaks at 1537, 1450, 1166, 961, and 778 cm −1 can be assigned to the C C in pyrrole ring stretching, the N-H bending, the C-H in plane bending, and the C-H out of plane bending, respectively [1,3,[27][28][29][30]. The C-H stretching absorption peak at 2924 cm −1 disappeared from the spectrum of the doped Ppy 1:6 due to the masking of the polaron and bipolaron absorption peak at 8066 cm −1 (1 eV) [1,31].…”

Section: Characterization Of Polypyrolementioning

confidence: 99%

“…Both n-type and p-type dopants have been utilized to induce an insulator-metal transition in conductive polymers [2]. Due to the thermodynamic stability of intermediates, one of carbocation is greater than one of carbanion, and conductive polymers are usually doped by p-type dopants [3].…”

Section: Introductionmentioning

confidence: 99%

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Section: Characterization Of Polypyrolementioning

confidence: 99%

Section: Polymerization Of Polypyrrolementioning

confidence: 99%

Section: Characterization Of Polypyrolementioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Conjugated Polymer Nanocomposites‐Based Chemical Sensors

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Effect of Transition Metals on the Electrical Conductivity Response of dPPV/Zeolite Y Composites toward Ketone Vapors

Kamonsawas

Sirivat

2014

Adv Polym Technol

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Doped poly(p-phenylene vinylene) (dPPV) is mixed with modified zeolite Y to improve the selective and sensitive response of zeolite Y toward three different ketone vapors (acetone, methyl ethyl ketone, and methyl iso-butyl ketone), which are known as the toxic components. Zeolite Y (Si/Al 5.1, Na + ) or NaY is ion exchanged with transition cations, Cu 2+ , Ni 2+ , and Fe 2+ , at 80% cation exchanged to prepare 80CuNaY, 80NiNaY, and 80FeNaY. In this work, the effects of transition cations, ketone vapor type, and ketone vapor concentration are systematically investigated. The highest electrical conductivity response and sensitivity toward acetone vapor at the vapor concentration of 30,000 ppm is obtained with 80CuNaY, whereas 80FeNaY shows the lowest values due to the electrostatic interaction between the zeolite framework and the cation. dPPV is mixed with 80CuNaY and exposed to the three ketone vapors. The electrical conductivity response and sensitivity of the composites toward acetone exhibits the highest values, whereas with MIBK they show the lowest value. After mixing of 80CuNaY with dPPV, the minimum vapor concentration toward acetone vapor decreases from 9 to 5 ppm. The response of the composite is irreversible as evidenced by Fourier transform infrared and atomic force microscopy techniques. C 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21473; View this article online at wileyonlinelibrary.com. are occupied by water and cations. Zeolites are known to provide high chemical stability, high porosity, high surface area, high selectivity, and adsorption properties. Nevertheless, zeolites still possess low electrical conductivity. The processes for improving the electrical conductivity of a zeolite are through adjusting the Si/Al ratio of zeolite, the ion-exchange process, and blending with conductive polymers (CPs). [5][6][7][8]14 The ion-exchange processes with alkaline, alkaline earth, and transition metals are expected to change the response and selectivity properties of zeolites. The ion-exchange process combined with blending a CP into the zeolite matrix has been shown to effectively improve the electrical conductivity of the zeolite for detecting toxic gases and chemical vapors. [5][6][7][8][14][15][16][17][18][19][20][21][22][23][24] CPs are the other type of materials, which can be used as gassensing materials as they show the high electrical conductivity, magnetic, and optical properties. One of the CPs, which has been widely used in the gas-sensing application, is poly(p-phenlene vinylene) (PPV) because it has a high electrical conductivity, good mechanical properties, good chemical stability, and ease in synthesizing. 25,26 A positive or negative response of doped PPV or dPPV depends on the electrophilic or nucleophilic nature of the gases or chemical vapors. Although dPPV exhibits a high electrical conductivity, its selectivity and adsorption properties

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Selective conductivity response of polypyrrole-based sensor on flammable chemicals

Cited by 37 publications

References 11 publications

Induced interaction between polypyrrole and SO2 via molecular sieve 13X

Induced interaction between polypyrrole and SO2 via molecular sieve 13X

Conjugated Polymer Nanocomposites‐Based Chemical Sensors

Effect of Transition Metals on the Electrical Conductivity Response of dPPV/Zeolite Y Composites toward Ketone Vapors

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