Studies of thermal decay of electropolymerized polypyrrole using in situ surface-enhanced Raman spectroscopy

Liu, Yu Chuan; Yang, Kuang Hsuan; Lin, Li Huei; Tsai, Jeng Feng

doi:10.1016/j.elecom.2007.11.019

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…Raman spectra provide molecular‐level information that is highly sensitive to conformation changes [24]. As shown by Liu et al [25], the PPy double‐peak in the range 1000–1150 cm −1 can be deconvoluted into its individual reduced and oxidized components (Fig. 9A).…”

Section: Resultsmentioning

confidence: 99%

“…The peaks located at 1050 and 1080 cm −1 are assigned to the C‐H in‐plane deformation of the quinoid form (oxidized state) and benzoid form (reduced state) of PPy, respectively. The oxidation degree, which is defined as the ratio of the area of oxidized PPy to that of total component peaks in this region of C‐H in‐plane deformation [25], is calculated for each composite and each polymerization process. The results are summarized in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Electrically conducting biodegradable polymer composites (polylactide‐polypyrrole and polycaprolactone‐polypyrrole) for passive resonant circuits

Boutry¹,

Gerber-Hörler²,

Hierold³

2012

Polymer Engineering & Sci

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Electrically conducting biodegradable polymer composites made of polypyrrole (PPy) nanoparticles embedded in poly(L‐lactide) (PLLA) or poly(ε‐caprolactone) (PCL) are prepared by chemical oxidative polymerization. They will be used as electrical conductors for fabricating biodegradable passive resonant circuits for bioimplants. For both composites, the conductivity exhibits a percolation threshold at ∼6 wt% of PPy. Several reactants are tested, the polymerization process resulting in the highest conductivity uses iron(III)chloride hexahydrate (FeCl3), sodium dodecyl benzene sulfonate, and p‐nitrophenol (pNPh), for both poly(L‐lactide)‐polypyrrole (PLLA‐PPy) and poly(ε‐caprolactone)‐polypyrrole (PCL‐PPy). Conductivities of 2.7 ± 0.8 S cmε1 (PLLA‐PPy) and 7.8 ± 2.3 S cm−1 (PCL‐PPy) are reached for a PPy content of 40 wt%. The PPy particle, observed by SEM, forms agglomerates having a size of 0.6–3.5 μm. The samples have similar PPy particle distributions over the entire cross sections. The conductivity as a function of time is investigated, being 34–70% of the initial value for samples stored in nitrogen, whereas it is less than 1% for samples stored in body‐like conditions, bringing the conclusion that a biodegradable packaging will be required to protect the resonant circuits from body fluids. Finally, the biocompatibility of the polymer composites is evaluated with cytocompatibility tests on dermal human fibroblast cells, showing promising results in particular for composites having a low PPy content. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrically conducting biodegradable polymer composites (polylactide‐polypyrrole and polycaprolactone‐polypyrrole) for passive resonant circuits

Boutry¹,

Gerber-Hörler²,

Hierold³

2012

Polymer Engineering & Sci

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“…Figure 1a) depicts the Raman spectra of polypyrrole (PPy). The peaks observed at 1597 and 1581 cm −1 represent C = C symmetry stretching [23][24]. The two peaks located at 1314 and 1378 cm −1 assigned to be the inter ring (C-C) stretching [22][23][24][25].…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The peaks observed at 1597 and 1581 cm −1 represent C = C symmetry stretching [23][24]. The two peaks located at 1314 and 1378 cm −1 assigned to be the inter ring (C-C) stretching [22][23][24][25]. The peak at 1055 cm −1 is attributed to ring deformation and two another peaks were located at 937 and 934 cm −1 are seen due to ring deformation related to bipolarons and polarons [26].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Structural and electrical properties of dodecylbenzene sulphonicacid doped polypyrrole/zirconium oxide composites

Irfan

Shakoor

2019

Rev. Mex. Fís.

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Polypyrrole (PPy) dispersed in an organic solvents were synthesized by means of dodecylbenzenesulphonic acid (DBSA) as useful dopant. Composites of doped PPy with DBSA and also mixed with zirconium oxide (ZrO2) nanoparticles were achieved by chemical polymerization route. Raman spectroscopy has been adopted to confirm the interaction between PPy-DBSA and ZrO2. The SEM also confirms the dual phase structure of platelet and egg shell in PPy-DBSA-ZrO2. Temperature dependant DC conductivity exhibited three dimensional variable ranges hopping (3D-VRH) model. Density of states, hopping length in addition to activation energy were calculated and was observe to be effected by increasing the weight ratio of ZrO2 into PPy-DBSA.

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Improved performance of surface‐enhanced Raman scattering on silver substrates prepared in nitric acid solutions

Der

Hsu

Liu

et al. 2011

J Raman Spectroscopy

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In this work, we propose a new electrochemical method to prepare surface‐enhanced Raman scattering (SERS)‐active silver substrates in nitric acid solutions. Experimental results indicate that the SERS intensity of adsorbed Rhodamine 6G (R6G) can be significantly increased, as compared with that of R6G adsorbed on a SERS‐active Ag substrate prepared by an electrochemical method in a chloride‐containing solution, which was generally employed in the literature. Moreover, the SERS of R6G on the newly developed substrate (prepared in a nitric acid solution) still performs well at a high temperature of 250 °C. However, the enhancement capability of the SERS‐active substrate prepared in a chloride‐containing solution is seriously destroyed at temperatures higher than 150 °C. Further investigations indicate that the oxidation states of roughened Ag substrates prepared in nitric acid solutions under different experiment conditions have less influence on the corresponding SERS performances. Instead, different surface morphologies of roughened Ag substrates and different contents of nitrogen‐containing dopping ions on the roughened Ag substrates demonstrate significant effects on the corresponding SERS performances. Copyright © 2011 John Wiley & Sons, Ltd.

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Studies of thermal decay of electropolymerized polypyrrole using in situ surface-enhanced Raman spectroscopy

Cited by 17 publications

References 19 publications

Electrically conducting biodegradable polymer composites (polylactide‐polypyrrole and polycaprolactone‐polypyrrole) for passive resonant circuits

Electrically conducting biodegradable polymer composites (polylactide‐polypyrrole and polycaprolactone‐polypyrrole) for passive resonant circuits

Structural and electrical properties of dodecylbenzene sulphonicacid doped polypyrrole/zirconium oxide composites

Improved performance of surface‐enhanced Raman scattering on silver substrates prepared in nitric acid solutions

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