Langmuir–Schaefer Films for Aligned Carbon Nanotubes Functionalized with a Conjugate Polymer and Photoelectrochemical Response Enhancement

Sgobba, Vito; Giancane, Gabriele; Cannoletta, Donato; Operamolla, Alessandra; Omar, Omar Hassan; Farinola, Gianluca M.; Guldi, Dirk M.; Valli, Ludovico

doi:10.1021/am403656k

Cited by 37 publications

(28 citation statements)

References 29 publications

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“…These Langmuir monolayers can then be transferred to a chosen substrate using the vertical Langmuir-Blodgett (LB) or horizontal Langmuir-Schaefer (LS) method [25]. Several devices including molecular sensors [26], photo-electrochemical devices [27], organic semi-conductor devices [28], and field effect transistors [29], have been fabricated using Langmuir technology. DEA electrodes based on stretchable monolayer conductors fabricated by the Langmuir technology have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Haitami

Sorba

et al. 2018

Sensors and Actuators B: Chemical

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In this work, a Multiwalled Carbon Nanotube/poly(alkylthiophene) (MWCNT/PT) composite is developed as the electrodes for dielectric elastomer actuators (DEAs) using the Langmuir-Schaefer (LS) method. These composites form stable monolayers at the air-water interface that can then be LS transferred onto a poly(dimethylsiloxane) (PDMS) elastomer membrane. The monolayer electrode remains conductive up to 100% uniaxial strain. We present a method to fabricate DEAs using the LS transferred electrodes. By using a mask during the transfer step, the electrodes can be patterned with better than 200 m resolution on both sides of a 1.4 m-thick pre-stretched PDMS membrane to produce an ultra-low voltage DEA. The DEA generates 4.0% linear strain at an actuation voltage of 100 V, an order of magnitude lower than the typical DEA operating voltage.

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Section: Introductionmentioning

confidence: 99%

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Haitami

Sorba

et al. 2018

Sensors and Actuators B: Chemical

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“…[26] However, these films consist of many stacked layers of nanotubes. These methods include directional chemical vapor deposition, [30][31][32][33] Langmuir-Blodgett [34] and Schaefer [35] strategies, floating evaporative self-assembly, [36][37][38] directed evaporation, [39][40][41] and elastomeric release, [42] among others. [27][28][29] Methods have been pursued for the more specialized alignment of nanotubes specifically for thin film electronics applications.…”

Section: Introductionmentioning

confidence: 99%

“…Methods have been pursued for the more specialized alignment of nanotubes specifically for thin film electronics applications. These methods include directional chemical vapor deposition, Langmuir–Blodgett and Schaefer strategies, floating evaporative self‐assembly, directed evaporation, and elastomeric release, among others. Many of these approaches are promising, and significant progress has been made, for example, in producing transistors with high conductance, with high mobility, or that have aggressively downscaled channel lengths .…”

Section: Introductionmentioning

confidence: 99%

Substrate‐Wide Confined Shear Alignment of Carbon Nanotubes for Thin Film Transistors

Jinkins

Chan

Jacobberger

et al. 2018

Adv Elect Materials

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of highly aligned, individualized, electronics-grade semiconducting nanotubes are needed. These nanotubes must be uniformly deposited over large-area substrates at an intermediate linear packing density of 50-200 nanotubes µm −1 . [6,7] Alignment is important, as it decreases the number of resistive nanotube-nanotube junctions in the charge percolation pathway, thereby enabling high transistor drive current and mobility. [8,9] Moreover, nanotube individualization and control over packing density are important because the bundling and the formation of multilayers of tubes at high packing densities can result in transistors with low on/off conductance modulation ratio due to electrostatic screening. [10,11] Bundles and multilayers can also decrease on-current due to difficulties in forming low-resistance electrical contacts to tightly spaced nanotubes. [12] On the other hand, if the density of nanotubes is too low, then there are an insufficient number of charge conducting pathways, resulting in poor on-current and mobility. Individualization is also imperative in applications such as sensors, in which the nanotube surface area must be maximized to increase the number of accessible sites for analyte binding. [13] Driving nanotube alignment has been difficult, by itself, but concurrently realizing control over packing density, nanotube individualization, uniformity, and large-area scaling has been especially challenging. Most conventional approaches for depositing nanotubes onto substrates (e.g., spin, [14] blade, [15] and drop casting [16] ; spraying [17,18] ; and vacuum filtration [19,20] ) yield films of nanotubes that are randomly oriented. Strategies for aligning nanotubes have been pursued; however, many of these approaches have been developed without thin film transistors in mind. For example, the alignment of multiwalled carbon nanotubes has been demonstrated extensively; yet, multiwalled carbon nanotubes are semimetallic and thus are not suitable for transistors. [21,22] Furthermore, techniques for aligning multiwalled carbon nanotubes are generally difficult to translate to aligning single-walled carbon nanotubes, which are considerably smaller than multiwalled nanotubes. The alignment of nanotubes in polymer matrices has also received substantial attention, but this technique yields bulk composites rather than single layers of tubes on surfaces. [23][24][25] Likewise, recent work To exploit their charge transport properties in transistors, semiconducting carbon nanotubes must be assembled into aligned arrays comprised of individualized nanotubes at optimal packing densities. However, achieving this control on the wafer-scale is challenging. Here, solution-based shear in substrate-wide, confined channels is investigated to deposit continuous films of well-aligned, individualized, semiconducting nanotubes. Polymerwrapped nanotubes in organic ink are forced through sub-mm tall channels, generating shear up to 10 000 s −1 uniformly aligning nanotubes across substrates. The ink volume and concentration, channe...

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“…In both cases the attitude of the carbon nanotubes to aggregate was overcome using the π-electron cloud of Pc that interacts with the π-electrons of CNTs enhancing their solubility. This approach is often preferred to the covalent functionalization of the carbon nanotubes since the covalent approach can induce important modifications to electronic and spectroscopic features of CNTs [39,111,112]. In an another system [113] ZnPc derivative was coupled with CNTs by means of the use of a pyrene (magenta colored in Figure 19) functionalized with the imidazole entity.…”

Section: Pcs-based Supramolecular Assemblies For Photovoltaic Applicamentioning

confidence: 99%

Applications of Photoinduced Phenomena in Supramolecularly Arranged Phthalocyanine Derivatives: A Perspective

2020

Self Cite

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This review focuses on the description of several examples of supramolecular assemblies of phthalocyanine derivatives differently functionalized and interfaced with diverse kinds of chemical species for photo-induced phenomena applications. In fact, the role of different substituents was investigated in order to tune peculiar aggregates formation as well as, with the same aim, the possibility to interface these derivatives with other molecular species, as electron donor and acceptor, carbon allotropes, cyclodextrins, protein cages, drugs. Phthalocyanine photo-physical features are indeed really interesting and appealing but need to be preserved and optimized. Here, we highlight that the supramolecular approach is a versatile method to build up very complex and functional architectures. Further, the possibility to minimize the organization energy and to facilitate the spontaneous assembly of the molecules, in numerous examples, has been demonstrated to be more useful and performing than the covalent approach.

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Langmuir–Schaefer Films for Aligned Carbon Nanotubes Functionalized with a Conjugate Polymer and Photoelectrochemical Response Enhancement

Cited by 37 publications

References 29 publications

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Stretchable composite monolayer electrodes for low voltage dielectric elastomer actuators

Substrate‐Wide Confined Shear Alignment of Carbon Nanotubes for Thin Film Transistors

Applications of Photoinduced Phenomena in Supramolecularly Arranged Phthalocyanine Derivatives: A Perspective

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