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Spectroscopic investigations of ammonia gas sensing mechanism in polypyrrole nanotubes/nanorods
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10.1063/1.4793994
/content/aip/journal/jap/113/9/10.1063/1.4793994
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/9/10.1063/1.4793994
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of synthesis of PPy nanotubes and nanorods.

Image of FIG. 2.
FIG. 2.

FTIR spectra of samples S1 and S2.

Image of FIG. 3.
FIG. 3.

Raman Spectra of samples S1 and S2.

Image of FIG. 4.
FIG. 4.

XRD patterns of pure MO, sample S1 and S2.

Image of FIG. 5.
FIG. 5.

SEM micrographs of samples (a) S1 and (b) S2.

Image of FIG. 6.
FIG. 6.

Deconvoluted Raman spectra of the (a) D and G bands, and (b) polaron and bipolaron bands for samples S1 and S2.

Image of FIG. 7.
FIG. 7.

Deconvoluted FTIR spectra of asymmetric and symmetric bands of the samples S1 and S2.

Image of FIG. 8.
FIG. 8.

Sensitivity at 100 ppm of ammonia for the samples (a) S1, (b) S2 and at various (20–300 ppm) ppm levels of ammonia for the samples (c) S1, (d) S2; (e) Variation of sensitivity as a function ammonia ppm levels.

Image of FIG. 9.
FIG. 9.

Raman spectra recorded at different interval of time of ammonia exposure and recovery (rec) for (a) sample S1, and (b) sample S2.

Image of FIG. 10.
FIG. 10.

Deconvoluted Raman spectra of D and G bands recorded at different interval of time of ammonia exposure for (a) sample S1, and (b) sample S2; Variation in peaks positions of D bands, G bands and area ratio of D bands to G bands as a function of ammonia exposure time for samples (c) S1, and (d) S2.

Image of FIG. 11.
FIG. 11.

(a) Deconvoluted Raman spectra recorded at different interval of time of ammonia exposure and recovery of (a) D band and (b) bands located in the range of 1100–1200 cm−1 for sample S1; Variation of area under the curves present(c) in D band, and (d) in the range of 1100–1200 cm−1 as a function of ammonia exposure time for sample S1.

Image of FIG. 12.
FIG. 12.

Deconvoluted Raman spectra of polaron and bipolaron bands for (a) sample S1, (b) sample S2 recorded at different interval of ammonia exposure, (c) Variation of ratio of area of under the bipolaron to polaron bands (AB/AP) as a function of ammonia exposure time for both the samples S1 and S2.

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/content/aip/journal/jap/113/9/10.1063/1.4793994
2013-03-05
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectroscopic investigations of ammonia gas sensing mechanism in polypyrrole nanotubes/nanorods
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/9/10.1063/1.4793994
10.1063/1.4793994
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