Functional Materials: Properties, Processing and Applications

Vilarinho, Paula M.

doi:10.1007/1-4020-3019-3_1

Cited by 12 publications

(10 citation statements)

References 76 publications

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“…Kelvin probe force microscopy (KPFM) is a powerful tool for the direct measurement of the surface potential of semiconductors [24]. Several groups have used this technique to monitor the work function difference between the different number of layers of MoS 2 samples [25], studying the effect of the substrate on the electrostatic properties of MoS 2 layers [26], and assessing the effect of gas and molecular adsorption on chemical vapor deposition (CVD)-grown MoS 2 flakes [27,28,29].…”

Section: Introductionmentioning

confidence: 99%

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

2019

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The discovery of layered materials, including transition metal dichalcogenides (TMD), gives rise to a variety of novel nanoelectronic devices, including fast switching field-effect transistors (FET), assembled heterostructures, flexible electronics, etc. Molybdenum disulfide (MoS2), a transition metal dichalcogenides semiconductor, is considered an auspicious candidate for the post-silicon era due to its outstanding chemical and thermal stability. We present a Kelvin probe force microscopy (KPFM) study of a MoS2 FET device, showing direct evidence for pinch-off formation in the channel by in situ monitoring of the electrostatic potential distribution along the conducting channel of the transistor. In addition, we present a systematic comparison between a monolayer MoS2 FET and a few-layer MoS2 FET regarding gating effects, electric field distribution, depletion region, and pinch-off formation in such devices.

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Section: Introductionmentioning

confidence: 99%

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

2019

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“…Some of the most important perovskite materials are lead-based ones, such as lead titanate (PT), lead zirconate titanate (PZT), lead lanthanum zirconate titanate (PLZT), or lead magnesium niobate (PMN). The morphotropic phase boundary compositions of the solid solution between PbTiO 3 and PbZrO 3 present some of the highest piezoelectric coefficients, and as so, it is currently the most commonly used system for piezoelectric applications . However, because of environmental concerns lead-free materials have been considered as substitutes to the former ones.…”

Section: Introductionmentioning

confidence: 99%

Growth of Incipient Ferroelectric KTaO₃ Single Crystals by a Modified Self-Flux Solution Method

Złotnik

Vilarinho

Costa

et al. 2010

Crystal Growth & Design

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High-quality potassium tantalate (KTaO3, KT) single crystals are grown by a high-temperature self-flux solution modified method in which potassium carbonate (K2CO3) and boron oxide (B2O3) are utilized as a complex flux. Additions of small amounts of boron oxide, used because of its low melting temperature (450 °C) and tendency to decrease the weight losses, increased the metastable region, requiring lower temperature (≤1300 °C) for the growth of relatively large KT crystals thereby suppressing the K volatilization tendency. By changing the flux composition and flux to solute proportion growth conditions are modified. The as-grown potassium tantalate crystals exhibit a dielectric permittivity of 6600 and dielectric losses of 0.004 at 13 K and 100 kHz. These results suggest a new promising approach for growing relatively large size and high quality single crystals within KT-based system.

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“…Flexible materials are extremely desired in various fields from electronics to energy applications and, more recently, in healthcare devices [1,2] . In the last case, this type of innovative products will be useful, for example, for the creation of intradermal or on‐skin physical sensors or actuators with enhanced comfort, efficiency, sensibility and reliability in the diagnosis, prevention and treatment [3] . Typically, biomedical systems are based on hard and brittle materials embedded into non‐friendly sensing equipment, limiting the adaptability to the body and the sensitiveness to body motion.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] In the last case, this type of innovative products will be useful, for example, for the creation of intradermal or on-skin physical sensors or actuators with enhanced comfort, efficiency, sensibility and reliability in the diagnosis, prevention and treatment. [3] Typically, biomedical systems are based on hard and brittle materials embedded into non-friendly sensing equipment, limiting the adaptability to the body and the sensitiveness to body motion. Wearable devices such as wristbands, belts, helmets or smart watches are searching for soft, thin and elastic flexible composites aligning comfort to contact with human skin and a large mechanical deformation.…”

Section: Introductionmentioning

confidence: 99%

Flexible Piezoelectric Chitosan and Barium Titanate Biocomposite Films for Sensor Applications

et al. 2021

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There is currently a demand for flexible biomedical sensors. Characteristics as soft, thin, elastic, flexible and comfortable to the contact with skin should be matched with performance and ultimately made of sustainable, and biocompatible materials. In this work, chitosan as a flexible biodegradable polymeric matrix was combined with ferroelectric BaTiO3 particles obtained by hydrothermal synthesis to prepare flexible films. The biocomposites have high flexibility and the addition of particles improves the elasticity of pristine chitosan films. Of relevance towards the targeted application, the biocomposites exhibit a better resistance to water than chitosan. The dielectric permittivity increases with the addition of BaTiO3 particles. The observation of d33 and d15 by PFM, confirms the presence of piezoelectric domains corresponding to the location of BaTiO3 particles. These results contribute to the understanding of the role of functional oxides on the chemical and physical behavior of biobased polymers, creating opportunities to design optimized and more sustainable flexible piezoelectric sensor films.

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Functional Materials: Properties, Processing and Applications

Cited by 12 publications

References 76 publications

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

Growth of Incipient Ferroelectric KTaO₃ Single Crystals by a Modified Self-Flux Solution Method

Flexible Piezoelectric Chitosan and Barium Titanate Biocomposite Films for Sensor Applications

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Functional Materials: Properties, Processing and Applications

Cited by 12 publications

References 76 publications

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

Pinch-Off Formation in Monolayer and Multilayers MoS2 Field-Effect Transistors

Growth of Incipient Ferroelectric KTaO3 Single Crystals by a Modified Self-Flux Solution Method

Flexible Piezoelectric Chitosan and Barium Titanate Biocomposite Films for Sensor Applications

Contact Info

Product

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Growth of Incipient Ferroelectric KTaO₃ Single Crystals by a Modified Self-Flux Solution Method