Wearable binary cooperative polypyrrole nanofilms for chemical mapping on skin

Morais, Vitória B. de; Correa, Carlos; Lanzoni, Evandro M.; Costa, Carlos Alberto Rodrigues; Bufon, Carlos César Bof; Santhiago, Murilo

doi:10.1039/c8ta12354c

Cited by 15 publications

(19 citation statements)

References 33 publications

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“…As one of the most common semiconducting polymers, polypyrrole (PPy) exhibits characteristics that have been essential for novel organic and molecular electronics. − Apart from low-cost synthesis, the use of PPy-based materials is quite promising due to their high energy-storage capacity, good electrical conductivity, and environmental stability . PPy structures can be synthesized as thin films, either chemically or electrochemically.…”

Section: Introductionmentioning

confidence: 99%

Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation

Pozzoli

Merces

Yassitepe

et al. 2020

ACS Appl. Nano Mater.

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The investigation of the charge-transport mechanism across disordered conducting and semiconducting materials is of relevance, considering the applications in modern organic and hybrid electronics. The transition from bulk to nm-thick layers may lead to unexpected physical/chemical properties as the device interfaces do influence the overall charge-carrier conduction. Here, we present an investigation of the electrical transport across vertical heterojunctions having disordered nm-thick films (polypyrrole, PPy) as the active material. The PPy structures are prepared by chemical polymerization from the pyrrole vapor phase, resulting in film thicknesses of a few tens of nanometers. The electrical characteristics of the devices are evaluated as a function of voltage and temperature, and the charge transport is found to be strongly influenced by the presence of trap states at the PPy highest occupied molecular orbitalgiving rise to space-chargelimited conduction with exponential distribution of traps. The trapping-state density is calculated, and X-ray photoelectron spectroscopy revealed an increase of disorder and a reduced doping density at the PPy growth interface. As a proof of concept, the PPy films integrated within the as-fabricated vertical heterostructures are applied as photosensitive devices. The observation of photocurrent is correlated to the presence of a gradient in the doping profile (from ca. 27.6 to 17.2% when thickness decreases from 120 to 20 nm). Our findings contribute to the elucidation of the charge-trapping center's origin in the nm-thick PPy films, as well as envision further applications in photoelectrochemistry, solar cells, and water splitting.

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Section: Introductionmentioning

confidence: 99%

Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation

Pozzoli

Merces

Yassitepe

et al. 2020

ACS Appl. Nano Mater.

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“…The peaks at 400.3 and 401.6 eV were assigned to the positively charged polaron (41% of the total N content) and bipolaron (3.5% of the total N content) species, respectively (Figure S9). 74,75 The protonation of PPy is caused by oxidation during the polymerization process, which may generate positive charged polarons/bipolarons. 76 The XPS results confirm the formation of PPy, in which the polaron and bipolaron species can adsorb I 3…”

Section: Resultsmentioning

confidence: 99%

Porous Polymer Cubosomes with Ordered Single Primitive Bicontinuous Architecture and Their Sodium–Iodine Batteries

et al. 2022

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Bicontinuous porous materials, which possess 3D interconnected pore channels facilitating a smooth mass transport, have attracted much interest in the fields of energy and catalysis. However, their synthesis remains very challenging. We report a general approach, using polymer cubosomes as the template, for the controllable synthesis of bicontinuous porous polymers with an ordered single primitive (SP) cubic structure, including polypyrrole (SP-PPy), poly-m-phenylenediamine (SP-PmPD), and polydopamine (SP-PDA). Specifically, the resultant SP-PPy had a unit cell parameter of 99 nm, pore diameter of 45 nm, and specific surface area of approximately 60 m 2 •g −1 . As a proof of concept, the I 2 -adsorbed SP-PPy was employed as the cathode materials of newly emerged Na−I 2 batteries, which delivered a record-high specific capacity (235 mA•h•g −1 at 0.5 C), excellent rate capability, and cycling stability (with a low capacity decay of 0.12% per cycle within 400 cycles at 1 C). The advantageous contributions of the bicontinuous structure and I 3 − adsorption mechanism of SP-PPy were revealed by a combination of ion diffusion experiments and theoretical calculations. This study opens a new avenue for the synthesis of porous polymers with new topologies, broadens the spectrum of bicontinuous-structured materials, and also develops a novel potential application for porous polymers.

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“…The IR spectra of C–O and C=O indicated that the skin and core of carbon fibers were not pyrolyzed homogenously. AFM-IR techniques have also been used to detect the polypyrrole wearable nanofilm devices on the surface of cellulose-based substrates [ 69 ].…”

Section: Afm-ir and Ir S-snom Application In Cellulose Materialsmentioning

confidence: 99%

Recent Progress on the Characterization of Cellulose Nanomaterials by Nanoscale Infrared Spectroscopy

Zhu

Zhou

et al. 2021

Nanomaterials

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Researches of cellulose nanomaterials have seen nearly exponential growth over the past several decades for versatile applications. The characterization of nanostructural arrangement and local chemical distribution is critical to understand their role when developing cellulose materials. However, with the development of current characterization methods, the simultaneous morphological and chemical characterization of cellulose materials at nanoscale resolution is still challenging. Two fundamentally different nanoscale infrared spectroscopic techniques, namely atomic force microscope based infrared spectroscopy (AFM-IR) and infrared scattering scanning near field optical microscopy (IR s-SNOM), have been established by the integration of AFM with IR spectroscopy to realize nanoscale spatially resolved imaging for both morphological and chemical information. This review aims to summarize and highlight the recent developments in the applications of current state-of-the-art nanoscale IR spectroscopy and imaging to cellulose materials. It briefly outlines the basic principles of AFM-IR and IR s-SNOM, as well as their advantages and limitations to characterize cellulose materials. The uses of AFM-IR and IR s-SNOM for the understanding and development of cellulose materials, including cellulose nanomaterials, cellulose nanocomposites, and plant cell walls, are extensively summarized and discussed. The prospects of future developments in cellulose materials characterization are provided in the final part.

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Wearable binary cooperative polypyrrole nanofilms for chemical mapping on skin

Abstract: Wearable polypyrrole nanofilm arrays have been developed to extend the natural capabilities of the skin.

Cited by 15 publications

References 33 publications

Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation

Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation

Porous Polymer Cubosomes with Ordered Single Primitive Bicontinuous Architecture and Their Sodium–Iodine Batteries

Recent Progress on the Characterization of Cellulose Nanomaterials by Nanoscale Infrared Spectroscopy

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