Characteristics of flexible electrode made on cellulose by soluble polypyrrole coating

Nayak, Jyoti; Mahadeva, Suresha K.; Kim, Jaehwan

doi:10.1177/0954406212439965

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…The optical bandgap of Ppy was estimated to be 3.1 eV from Tauc plot (see inset of Figure 1c). [ 8,9 ] The band at 557 cm −1 (CN) and others suggested the existence of related functional groups and their vibrational bands in Ppy, and the peak at 669 cm −1 corresponds to GaO, [ 10,11 ] confirming the successful deposition of Ppy into the GaN NRs surface, as shown in Figure S1a, Supporting Information. The XPS survey scan exhibited the peaks, related to the Ga 2p, Ga 3d, O 1s, C 1s, and N 1s states of Ppy/GaN NRs and Ppy, as displayed in Figure S1b, Supporting Information.…”

Section: Figurementioning

confidence: 61%

“…The calculated conduction band offset (CBO) and valence band offset (VBO) values were found to be Δ E c = 0.95 ± 0.1 eV and Δ E v = 1.26 ± 0.1 eV by substituting the obtained values from the XPS analysis using the standard equation reported elsewhere. [ 8 ] The XPS analysis suggests that our Ppy/GaN NRs belonged to the type‐II band alignment.

Δ E_{normalv} = (E_{C 1 s}^{Ppy} - E_{VBM}^{P 1}) + (E_{Ga 2 {normalp}_{\frac{true}{3}}}^{Ppy / GaN} - E_{C 1 s}^{Ppy / GaN}) - (E_{Ga 2 {normalp}_{\frac{true}{3}}}^{GaN} - E_{VBM}^{GaN})

Δ E_{normalc} = E_{normalg} (Ppy) + Δ E_{normalv} - E_{normalg} (GaN)

…”

Section: Figurementioning

confidence: 99%

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Efficient Charge Separation in Polypyrrole/GaN‐Nanorod‐Based Hybrid Heterojunctions for High‐Performance Self‐Powered UV Photodetection

Pasupuleti

Reddeppa

Park

et al. 2021

Physica Rapid Research Ltrs

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The ozonosphere is infiltrated by UV‐A rays (λ = 320–400 nm) that reach the Earth's atmosphere, posing serious health problems such as premature aging and skin cancer. Owing to the importance of UV‐A ray detection, highly detective, novel, and high‐speed UV‐A photodetectors have recently attracted considerable attention. The integration of organic and inorganic hybrid structures yields highly attractive optoelectronic properties that make them attractive candidates for high‐performance self‐powered UV‐A photodetectors. Herein, the integration of conductive polypyrrole (Ppy) and GaN nanorods for high‐performance self‐powered UV‐A photodetectors is demonstrated. The device exhibits superior photoresponse properties such as detectivity, responsivity, and external quantum efficiency values as 5.0 × 1012 Jones, 102 A W−1, and 29.8 × 103%, respectively, at a power density of 1.32 mW cm−2 (λ = 382 nm) and zero bias, which are relatively higher than those of pristine GaN nanorods. Furthermore, the device exhibits good stability and reproducibility with fast rising (350 ms) and falling (410 ms) times. The high photoresponse is attributed to the large built‐in potential formed at the interface junction of the Ppy and the GaN nanorods. Furthermore, the mechanism behind the high photoresponse is investigated using an X‐ray photoelectron spectroscopy (XPS) analysis and energy band theory.

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Section: Figurementioning

confidence: 61%

Δ E_{normalv} = (E_{C 1 s}^{Ppy} - E_{VBM}^{P 1}) + (E_{Ga 2 {normalp}_{\frac{true}{3}}}^{Ppy / GaN} - E_{C 1 s}^{Ppy / GaN}) - (E_{Ga 2 {normalp}_{\frac{true}{3}}}^{GaN} - E_{VBM}^{GaN})

Δ E_{normalc} = E_{normalg} (Ppy) + Δ E_{normalv} - E_{normalg} (GaN)

…”

Section: Figurementioning

confidence: 99%

Efficient Charge Separation in Polypyrrole/GaN‐Nanorod‐Based Hybrid Heterojunctions for High‐Performance Self‐Powered UV Photodetection

Pasupuleti

Reddeppa

Park

et al. 2021

Physica Rapid Research Ltrs

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“…The absorption peak at 267 nm can be ascribed to the characteristic π–π* transition in the aromatic ring, and the peak at 356 is attributed to the π–π* transition . The broad absorption band centered at 500 nm is ascribed to bipolaron absorption and tailing of free carrier close to the IR region . Relatively sharper peaks are observed in the absorption spectra of PPy-coated Gr, with a blue shift of the peak positions.…”

Section: Results and Discussionmentioning

confidence: 95%

“…52 The broad absorption band centered at 500 nm is ascribed to bipolaron absorption and tailing of free carrier close to the IR region. 53 Relatively sharper peaks are observed in the absorption spectra of PPy-coated Gr, with a blue shift of the peak positions. The characteristics π−π* transition peaks are shifted from 267 to 260 and 356 to 344 nm, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Reduced Hopping Barrier Potential in NiO Nanoparticle-Incorporated, Polypyrrole-Coated Graphene with Enhanced Thermoelectric Properties

Debnath

Deb

Bhowmik

et al. 2020

ACS Appl. Energy Mater.

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In view of the limiting factor in the thermoelectric conversion efficiency, an attempt has been made in this work with molecular-levelenergy barrier engineering in NiO-incorporated, polypyrrole-coated graphene (NiO@ PPy/Gr). A simple, inexpensive, and ultrasonic technique has been adopted for preparation of NiO@PPy/Gr composites through an in situ oxidative polymerization process. For exploring the physical properties of the prepared NiO@PPy/Gr composites, X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM) images, UV−visible absorption spectra, and Raman spectra were analyzed. On studying the electrical conductivity (σ) and Seebeck coefficient (S), inspiring enhancement has been observed in thermoelectric properties of NiO@PPy/Gr as compared to those of pure polypyrrole (PPy). This enhancement is mainly attributed to the strong π−π interactions between the conjugated structure of PPy and the π-bonded surface of graphene (Gr), which leads to the formation of more ordered regions with high crystallinity in the composite. Additionally, NiO acts as a bridge between PPy and Gr in the composites, remarkably improving the charge transport and charge carrier dynamics toward enhanced thermoelectric properties. A notable 855 times enhanced power factor (PF) of 28.22 μW/mK 2 was recorded as compared with that of pure PPy, with a temperature difference of only 100 °C.

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“…The strong peak centered at 281 nm is attributed to the π–π* interband transition, specifically, transition between the valence band and the conduction band of the neutral state of PPy, which ensured the formation of PPy . The broad band centered at 500 nm is attributed to absorption of the bipolaron and the free carrier tailing the near-IR region . Another broad absorption observed beyond 730 nm is also contributed by Te, as it absorbs in the IR region.…”

Section: Resultsmentioning

confidence: 99%

Low Interfacial Energy Barrier and Improved Thermoelectric Performance in Te-Incorporated Polypyrrole

et al. 2020

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Controlled carrier dynamics and energy band engineering in polymer systems can provide a wider scope for studying the thermoelectric (TE) performance of such systems. With such an objective, polypyrrole (PPy) powders were prepared, incorporating a small amount of tellurium (Te) during the polymerization of pyrrole. The polymerization process was conducted through an oxidative chemical polymerization technique using ammonium peroxydisulfate (APS) as an oxidizing agent. The crystal structure, morphological, optical, and electrical transport properties were studied to explore the possibility of the better performance of PPy as a thermoelectric material when incorporated with Te. Since achieving a high thermo emf at a considerably low temperature difference is of great significance, and the thermoelectric performances of the prepared samples were studied in a 100 °C temperature difference range in this work. A TE power factor of as much as 23.89 μW/mK2 has been recorded for Te-incorporated PPy, which is about 859 times larger than that of pure PPy. This has been achieved by influencing the carrier dynamics in the system mainly in two ways: first, by inducing a carrier-filtering effect acquired by lowering the interfacial energy barrier between the polymer and Te and, second, by improving the carrier transport over the polymer chains with enhanced carrier hopping. As a result, a noticeably improved electrical conductivity of 0.472 S/cm and an exceptionally high Seebeck coefficient of 0.74 mV/°C have been recorded.

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Characteristics of flexible electrode made on cellulose by soluble polypyrrole coating

Cited by 16 publications

References 10 publications

Efficient Charge Separation in Polypyrrole/GaN‐Nanorod‐Based Hybrid Heterojunctions for High‐Performance Self‐Powered UV Photodetection

Efficient Charge Separation in Polypyrrole/GaN‐Nanorod‐Based Hybrid Heterojunctions for High‐Performance Self‐Powered UV Photodetection

Reduced Hopping Barrier Potential in NiO Nanoparticle-Incorporated, Polypyrrole-Coated Graphene with Enhanced Thermoelectric Properties

Low Interfacial Energy Barrier and Improved Thermoelectric Performance in Te-Incorporated Polypyrrole

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