Spray-Coating Thin Films on Three-Dimensional Surfaces for a Semitransparent Capacitive-Touch Device

Carey, Tian; Jones, Chris; Moal, Fred Le; Deganello, Davide; Torrisi, Felice

doi:10.1021/acsami.8b02784

Cited by 64 publications

(50 citation statements)

References 69 publications

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“…In addition, substrates with different shapes can also be processed using spray‐coating. Recently, Carey et al demonstrated spray‐coating of graphene ink on the inside of a poly(methyl methacrylate) sphere, enabling transparent capacitive‐touch sensor. They used hybrid inks of graphene/poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) stabilized by the π−π interaction between the graphene sheets and the backbone of the PEDOT and the electrostatic repulsion between the negatively charged PSS, to achieve 156 nm thick films with a root‐mean‐square roughness ( R RMS ) of 48 .…”

Section: Patterning Of 2d Inks Into Functional Structures For Electromentioning

confidence: 99%

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Production and Patterning of Liquid Phase–Exfoliated 2D Sheets for Applications in Optoelectronics

Witomska

Leydecker

Ciesielski

et al. 2019

Adv Funct Materials

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2D materials (2DMs), which can be produced by exfoliating bulk crystals of layered materials, display unique optical and electrical properties, making them attractive components for a wide range of technological applications. This review describes the most recent developments in the production of high-quality 2DMs based inks using liquid-phase exfoliation (LPE), combined with the patterning approaches, highlighting convenient and effective methods for generating materials and films with controlled thicknesses down to the atomic scale. Different processing strategies that can be employed to deposit the produced inks as patterns and functional thin-films are introduced, by focusing on those that can be easily translated to the industrial scale such as coating, spraying, and various printing technologies. By providing insight into the multiscale analyses of numerous physical and chemical properties of these functional films and patterns, with a specific focus on their extraordinary electronic characteristics, this review offers the readers crucial information for a profound understanding of the fundamental properties of these patterned surfaces as the millstone toward the generation of novel multifunctional devices. Finally, the challenges and opportunities associated to the 2DMs' integration into working opto-electronic (nano) devices is discussed.

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Section: Patterning Of 2d Inks Into Functional Structures For Electromentioning

confidence: 99%

Section: Patterning Of 2d Inks Into Functional Structures For Electromentioning

confidence: 99%

Production and Patterning of Liquid Phase–Exfoliated 2D Sheets for Applications in Optoelectronics

Witomska

Leydecker

Ciesielski

et al. 2019

Adv Funct Materials

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show abstract

“…An absorption coefficient of α ∼ 1390 L/(g m) for the graphene ink at 660 nm was utilized, 66 estimating a graphene flake concentration of ∼0.09 mg/mL, consistent with previous reports of graphene-based inks. 40,67 The spectrum of the graphene ink is mostly featureless due to the linear dispersion of the Dirac electrons, while the peak in the UV region is a signature of the van Hove singularity in the graphene density of states. 68 The ZnO scaffold was infiltrated 50 times to achieve coverage of graphene around the ZnO tetrapods, due to the low concentration of the ink (0.09 mg/mL).…”

Section: Methodsmentioning

confidence: 99%

Biomimetic Carbon Fiber Systems Engineering: A Modular Design Strategy To Generate Biofunctional Composites from Graphene and Carbon Nanofibers

Taale¹,

Schütt²,

Carey

et al. 2019

ACS Appl. Mater. Interfaces

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Carbon-based fibrous scaffolds are highly attractive for all biomaterial applications that require electrical conductivity. It is additionally advantageous if such materials resembled the structural and biochemical features of the natural extracellular environment. Here, we show a novel modular design strategy to engineer biomimetic carbon fiber-based scaffolds. Highly porous ceramic zinc oxide (ZnO) microstructures serve as three-dimensional (3D) sacrificial templates and are infiltrated with carbon nanotubes (CNTs) or graphene dispersions. Once the CNTs and graphene coat the ZnO template, the ZnO is either removed by hydrolysis or converted into carbon by chemical vapor deposition. The resulting 3D carbon scaffolds are both hierarchically ordered and free-standing. The properties of the microfibrous scaffolds were tailored with a high porosity (up to 93%), a high Young’s modulus (ca. 0.027–22 MPa), and an electrical conductivity of ca. 0.1–330 S/m, as well as different surface compositions. Cell viability, fibroblast proliferation rate and protein adsorption rate assays have shown that the generated scaffolds are biocompatible and have a high protein adsorption capacity (up to 77.32 ± 6.95 mg/cm3) so that they are able to resemble the extracellular matrix not only structurally but also biochemically. The scaffolds also allow for the successful growth and adhesion of fibroblast cells, showing that we provide a novel, highly scalable modular design strategy to generate biocompatible carbon fiber systems that mimic the extracellular matrix with the additional feature of conductivity.

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“…Later (2013-2014), Prof. Alberto Bianco, Prof. Peter Wick, and other members of the EU Graphene flagship project took action on this important matter and recommended a specific nomenclature and classification for 2D carbon materials, mainly based on their lateral size, number of layers, and oxidation degree. [8][9][10][11][12] Aside from this, monolayer GO optical transmittance has been reported to be modulated up to 24.8% by using an external electric field, [13] which has been associated with the electric-field-induced changes of electronic density of localized states and may enable new biosensing strategies based on electrochromic or optoelectronic principles/mechanisms. The following section summarizes and highlights these crucial features with especial emphasis on their overall impact related to optical bio/sensing performance.…”

Section: The Number Of Layers Lateral Size and Oxidation Degree Of mentioning

confidence: 99%

“…Hence, this feature should be carefully evaluated in GO-based bio/sensors intended for visual determination, optoelectronic interfaces and wearable devices. [8][9][10][11][12] Aside from this, monolayer GO optical transmittance has been reported to be modulated up to 24.8% by using an external electric field, [13] which has been associated with the electric-field-induced changes of electronic density of localized states and may enable new biosensing strategies based on electrochromic or optoelectronic principles/mechanisms. [14] Moreover, GO thickness has been reported to be crucial in laser energy absorption capabilities and laser energy transfer for efficient laser desorption/ionization mass spectrometry analysis.…”

Section: The Number Of Layers Lateral Size and Oxidation Degree Of mentioning

confidence: 99%

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

2018

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IntroductionAs a 2D material, graphene oxide (GO) is a lattice-like nanostructure of hexagonal carbon rings disrupted by oxygen-containing moieties. In 2012, we discussed the outstanding physicochemical properties offered by GO and how these features can be exploited in unprecedented optical biosensing systems. [1] In fact, GO can be processed in suspension, easily complexed with biomolecules, and offers a universal highly efficient long-range photoluminescence quenching agent-among other functional properties. Furthermore, we highlighted that GO photoluminescences with energy transfer donor/acceptor molecules exposed A few years ago, crucial graphene oxide (GO) features such as the carbon/oxygen ratio, number of layers, and lateral size were scarcely investigated and, thus, their impact on the overall optical biosensing performance was almost unknown. Nowadays valuable insights about these features are well documented in the literature, whereas others remain controversial. Moreover, most of the biosensing systems based on GO were amenable to operating as colloidal suspensions. Currently, the literature reports conceptually new approaches obviating the need of GO colloidal suspensions, enabling the integration of GO onto a solid phase and leading to their application in new biosensing devices. Furthermore, most GO-based biosensing devices exploit photoluminescent signals. However, further progress is also achieved in powerful label-free optical techniques exploiting GO in biosensing, particularly using optical fibers, surface plasmon resonance, and surface enhanced Raman scattering. Herein, a critical overview on these topics is offered, highlighting the key role of the physicochemical properties of GO. New challenges and opportunities in this exciting field are also highlighted.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201805043.in a planar surface. [1] However, GO properties can be tailored according to its oxidation degree, lateral size, and number of layers, which was something little explored 6 years ago, and thus their impact on the overall biosensing performance was almost unknown. In addition, most of the biosensing systems based on GO were amenable to working as colloidal suspensions. Though, recent literature reports conceptually new approaches obviating the need of colloidal suspensions, which facilitates integration of GO-based biosensors into the solid phase and allows for their applications in new devices. Furthermore, the majority of the GO-based optical biosensing techniques rely on photoluminescent signals. However, further progress has also been achieved in powerful label-free optical techniques exploiting GO in biosensing. Here, we introduce a progress report on this exciting topic, underscoring challenges and opportunities in (bio)sensing accordingly. Number of LayersGO aqueous suspensions are highly stable in the form of mono layers. However, GO multilayer films can be built via

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Spray-Coating Thin Films on Three-Dimensional Surfaces for a Semitransparent Capacitive-Touch Device

Cited by 64 publications

References 69 publications

Production and Patterning of Liquid Phase–Exfoliated 2D Sheets for Applications in Optoelectronics

Production and Patterning of Liquid Phase–Exfoliated 2D Sheets for Applications in Optoelectronics

Biomimetic Carbon Fiber Systems Engineering: A Modular Design Strategy To Generate Biofunctional Composites from Graphene and Carbon Nanofibers

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

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