Transparent films from carbon nanotubes/Prussian blue nanocomposites: preparation, characterization, and application as electrochemical sensors

Nossol, Edson; Zarbin, Aldo J. G.

doi:10.1039/c1jm14225a

Cited by 68 publications

(52 citation statements)

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“…[34][35][36][37] In a conventional three-electrode system, either an electrochemical overpotential or acidic media can promote the extraction of the iron species from the CNTs. Previously, CNT films were modified with PB at pH 7 through cyclic voltammetry over a range between -0.3 and 1.4 V. 35 At lower pHs, a narrower window can be applied, although the amount of material formed is directly dependent on both anodic and cathodic potentials, as well as the solution pH. As an example of this behavior, cyclic voltammograms of CNT films deposited over indium tin oxide (ITO) substrates were acquired using different pHs and potential scan ranges (Supplementary Information (SI), Figure S1).…”

Section: Resultsmentioning

confidence: 99%

“…This behavior is assigned to the presence of both Fe III -CN and Fe II -CN modes together with an intensification of the resonance effect observed for PB but not for its reduced form, that is colorless. 35,79 This study demonstrates that the produced composite is electrochemically active, and PB species can be reduced and reoxidized at the L/L interface.Following deposition, the composite film can be readily transferred to a target substrate, the nature of which may be varied depending on the specific application. In addition, the activity of the composite film at the L/L interface itself opens up the possibility for novel and interesting applications, such as mediated redox processes, selective membranes or even heterogeneous catalysis and sensing through biphasic systems.…”

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confidence: 99%

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confidence: 99%

“…This was also shown to be true for other CNT/HCM composites obtained by this method. [35][36][37] The electrodeposition of PB (or other HCMs) over CNTs requires the electrodes to be, at least to some extent, conductive. This condition restricts the type of substrates over which the CNT electrodes may be prepared and therefore their application and/or device configurations.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the narrower useful potential window when compared with the 3-electrode system, lower pHs were tested for the modification of CNTs. [35][36][37] Figure 3a presents the voltammograms obtained at pH 4. It is possible to observe the evolution of several redox peaks which are seen to increase in current on repeat cycling.…”

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Electrodeposition of Prussian Blue/Carbon Nanotube Composites at a Liquid‑Liquid Interface

Husmann

Booth

Zarbin

et al. 2018

J. Braz. Chem. Soc.

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The iron complex hexacyanoferrate (Fe 4 [Fe(CN) 6 ] 3 ), known as Prussian Blue (PB), was electrodeposited over a free-standing carbon nanotube (CNT) film assembled at the interface between two immiscible liquids, water and 1,2-dichlorobenzene. Polarization of the interface achieved through a fixed potential or under potential variation enabled iron present inside CNTs to generate a stable CNT/PB composite. We report herein on the observation that the deposition of PB is dependent on both the pH and applied potential. It was found that aqueous phases containing K 3 [Fe(CN) 6 ] can decompose under an applied potential, while those containing K 4 [Fe(CN) 6 ] presented more stable behavior making it a suitable precursor for PB synthesis. The electrodeposition and modification of the interface was followed by in situ spectroelectrochemical Raman spectroscopy, which indicated that an increase in signal due to PB formation was acompanied by changes in the CNT bands due to modification of the CNT walls by decoration with PB, forming a composite structure. Keywords: liquid-liquid interface, Prussian Blue, carbon nanotubes, immiscible liquids IntroductionBiphasic liquid/liquid (L/L) systems have been used for a long time, either for the study of interfacial electron and ion transfer reactions or for the synthesis and assembly of micro and nano-sized materials.1,2 The interface between two immiscible liquids provides a defect-free environment suitable for controlled homogeneous particle deposition. Driven by the decrease in the L/L interfacial free energy, particles dispersed or synthesized in a biphasic system spontaneously migrate to the interface formed by the two liquids. [3][4][5] Due to the ease of formation and robust nature of L/L interfaces, they have been utilized in a wide range of different applications. The L/L system can be used simply as a means to assemble previously synthesized materials into organized arrays or thin films, such as carbon nanostructures or metal nanoparticles. 6,7 Alternatively, materials can be both synthesized and assembled by using the L/L interface as the region of contact between reactants located in the different phases. [8][9][10] As an alternative to spontaneous reactions occurring at the point of contact between the two phases, material deposition can also occur by electrochemical polarization of the interface. 11,12 In addition to standard synthetic parameters such as concentration, time or pH, the applied potential and polarization of the interface between the two immiscible electrolyte solutions (ITIES) governs the rate of ion and electron transfer between the phases, allowing significant control over synthetic procedures. 1,2,13,14 By combining these different approaches to utilize the L/L interface, composite structures can be prepared using one material as the support and/or nucleation site for the other. 15,16 Previously, it has been observed that particle or polymer formation was possible, under stirring, on the surface of carbon nanostructures present in a L/L sy...

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Electrodeposition of Prussian Blue/Carbon Nanotube Composites at a Liquid‑Liquid Interface

Husmann

Booth

Zarbin

et al. 2018

J. Braz. Chem. Soc.

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Conductive Polymer Enabled Biostable Liquid Metal Electrodes for Bioelectronic Applications

Lim

Kim

Akbarian

et al. 2022

Adv Healthcare Materials

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Gallium (Ga)-based liquid metal materials have emerged as a promising material platform for soft bioelectronics. Unfortunately, Ga has limited biostability and electrochemical performance under physiological conditions, which can hinder the implementation of its use in bioelectronic devices. Here, an effective conductive polymer deposition strategy on the liquid metal surface to improve the biostability and electrochemical performance of Ga-based liquid metals for use under physiological conditions is demonstrated. The conductive polymer [poly(3,4-ethylene dioxythiophene):tetrafluoroborate]-modified liquid metal surface significantly outperforms the liquid metal.based electrode in mechanical, biological, and electrochemical studies. In vivo action potential recordings in behaving nonhuman primate and invertebrate models demonstrate the feasibility of using liquid metal electrodes for high-performance neural recording applications. This is the first demonstration of single-unit neural recording using Ga-based liquid metal bioelectronic devices to date. The results determine that the electrochemical deposition of conductive polymer over liquid metal can improve the material properties of liquid metal electrodes for use under physiological conditions and open numerous design opportunities for next-generation liquid metal-based bioelectronics.

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An Initial Review of the Status of Electrode Materials for Potassium‐Ion Batteries

Pramudita

Sehrawat

Goonetilleke

et al. 2017

Advanced Energy Materials

933

540

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The status of room‐temperature potassium‐ion batteries is reviewed in light of recent concerns regarding the rising cost of lithium and the fact that room‐temperature sodium‐ion batteries have yet to be commercialised thus far. Initial reports of potassium‐ion cells appear promising given the infancy of the research area. This review presents not only an overview of the current potassium‐ion battery literature, but also attempts to provide context by describing previous developments in lithium‐ion and sodium‐ion batteries and the electrochemical reaction mechanisms discovered thus far. Perspectives and directions on the techniques available to characterize newly developed battery materials are also provided based on our experience and knowledge from the literature. It is hoped that through this review, the potential of potassium‐ion batteries as a competitive energy‐storage technology will be realised, and the accessibility and available knowledge of the techniques required to develop the technology will be made apparent.

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Transparent films from carbon nanotubes/Prussian blue nanocomposites: preparation, characterization, and application as electrochemical sensors

Cited by 68 publications

References 64 publications

Electrodeposition of Prussian Blue/Carbon Nanotube Composites at a Liquid‑Liquid Interface

Electrodeposition of Prussian Blue/Carbon Nanotube Composites at a Liquid‑Liquid Interface

Conductive Polymer Enabled Biostable Liquid Metal Electrodes for Bioelectronic Applications

An Initial Review of the Status of Electrode Materials for Potassium‐Ion Batteries

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