High-Performance Field Emission from a Carbonized Cork

Lee, Jeong Seok; Lee, Hak Jun; Yoo, Jae Man; Kim, Taewoo; Kim, Yong Hyup

doi:10.1021/acsami.7b11873

Cited by 15 publications

(11 citation statements)

References 61 publications

(110 reference statements)

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“…This behavior is similar to that of carbonized cork at 1000 °C. [49] Cross-section images (Figure 3d,h) show an interaction depth with the cork in the order of 100 µm, unlike previous reports on the LIG formation with a UV laser that reported a shallow penetration in Kapton. [38] However, a fourfold reduction of the interaction depth was achieved when compared to LIG on cork produced with a CO 2 laser.…”

Section: Synthesis and Characterization Of Lig On Corkcontrasting

confidence: 65%

Laser‐Induced Graphene Piezoresistive Sensors Synthesized Directly on Cork Insoles for Gait Analysis

Carvalho

Fernandes

Martins

et al. 2020

Adv Materials Technologies

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rehabilitation as it provides objective data to aid the decision-making process by the healthcare staff. [1,2] Typically, this evaluation is done using a combination of inertial measurement units, sensorized mats, or force plates, and video inputs. [3-7] However, the use of mats limits the scope of the analysis to specific sessions and areas. While this technique provides the most detailed data available, point-of-care analysis through insoles sensitization has become an alternative. [8-13] The possibility to continuously monitor feet pressure and other gait parameters, offers valuable data not only in orthopedic rehabilitation [1,2,14] or the assessment of deformations such as the flat foot [15] but also to improve athletes' performance [7] and to mitigate diabetic neuropathy complications, [16,17] neurological disorders, [6,18-20] among others. Different pressure transduction mechanisms have been explored successfully for this application such as piezoresistivity, [9,10,21-25] capacitive sensing, [12,26] piezoelectricity, [27] triboelectricity, [28-31] optical line-of-sight sensing, [8] and fiber Bragg gratings. [11,13] To integrate such sensors into insoles, they can be added either as an extra component, printed or directly integrated using a functional material as the insole. Graphenebased materials have proven to be an interesting platform for mechanical sensing. While single-layer graphene is constrained to gauge-factors ≈2 as most bulk piezoresistive materials, [32] reduced graphene oxide (rGO) foams have demonstrated high sensitivity while being a low-cost technology. [33,34] Graphene flakes in the form of inks can also be printed directly onto materials, providing them with electrical conduction and sensing capabilities. [35] Alternatively, laser-induced graphene (LIG) can be directly synthesized on different materials, using the substrate as the carbon source. [36-38] LIG usually arises as a foamy material with electrical characteristics similar to those of good quality rGO, without requiring wet chemical processes involving dangerous chemicals like those used in the production of graphene oxide and its subsequent reduction. With the ability to be patterned in a fast and inexpensive way, LIG has attracted the interest of researchers for its use as active material in different biomedical applications. [38-41] The formation of LIG is carried out by the irradiation of a substrate with a high-power density laser source, leading to the instantaneous carbonization of the precursor material within a protective plasma created by the gaseous Monitorization of gait-related parameters is of the utmost importance to prevent complications in several diseases, ensuring affordable healthcare for the growing amount of chronic, lifestyle-related diseases and also for improving motion performance. Sensorized insoles allow to both pressure data and gait timings to be extracted non-intrusively in a point of care paradigm. Laserinduced graphene (LIG) offers a path to the integration of sensors in different kinds of materia...

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Section: Synthesis and Characterization Of Lig On Corkcontrasting

confidence: 65%

Laser‐Induced Graphene Piezoresistive Sensors Synthesized Directly on Cork Insoles for Gait Analysis

Carvalho

Fernandes

Martins

et al. 2020

Adv Materials Technologies

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“…The field emission (FE) properties of low-dimensional nanostructures have been extensively explored because of their interesting and promising applications in roll-up displays, miniaturized X-ray tubes, e-papers, backlight sources, and other common electronic devices. , Among the family of FE materials, one-dimensional SiC nanomaterial is recognized as one of the excellent candidates because of its versatile properties, including excellent mechanical behaviors, high thermal conductivity, robust chemical stability, and superior thermal-shock resistance, which favor it for use under harsh working conditions ( e.g. , high temperatures, high voltage, and high power). − To date, with respect to Fowler–Nordheim (F–N) theory, following strategies were developed for improving the FE behaviors of SiC emitters: (i) increasing the amount of efficient electron emission sites; , (ii) making the emitters with clear and sharp tips to improve the local field enhancement effects; , (iii) tailoring the emitters’ bandgaps via doping; , and (iv) growing well-aligned nanoarrays to limit the screening effects. , …”

Section: Introductionmentioning

confidence: 99%

High-Performance Field Emitters Based on SiC Nanowires with Designed Electron Emission Sites

Lou

et al. 2021

ACS Appl. Mater. Interfaces

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Making field emitters with both low turn-on field (E to) and high current emission stability is one of the keys to push forward their practical applications. In the present work, we report the exploration of high-performance field emitters with designed sharp corners around SiC nanowires for fundamentally enhanced electron emission sites. The sharp corners with tailored densities are rationally created based on a facile etching technique. Accordingly, the emission sites and nanowires are integrated into a single-crystalline configuration without interfaces, which could offer the emitters with a robust structure to avoid the structural damage induced by the generated Joule heat and electrostatic forces over long-term field emission (FE) operation. Consequently, the E to of the as-fabricated SiC field emitter is low down to 0.52 V/μm, which is comparable to the state-of-the-art one ever reported. Moreover, they have high electron emission stability with a current fluctuation of just 2% over 10 h, representing their promising applications in FE-based electronic units.

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Section: Animal-derived Biomass and Their Carbonizationmentioning

confidence: 99%

“…It can ensure a uniform heating of the biomass, as well as, the full release of gaseous products in the carbonization process. With the help of this method, Lee et al [117] have prepared unique BCMs with similar structures to the original cork tissues. The cell walls of the cork were approximately 1-2 µm thick with large wrinkles (Figure 6h,i).…”

Section: Carbonization Of Plant-derived Biomassmentioning

confidence: 99%

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Biomass‐Derived Carbon Materials: Controllable Preparation and Versatile Applications

Wang

Zhang

Shen

et al. 2021

Small

131

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Biomass‐derived carbon materials (BCMs) are encountering the most flourishing moment because of their versatile properties and wide potential applications. Numerous BCMs, including 0D carbon spheres and dots, 1D carbon fibers and tubes, 2D carbon sheets, 3D carbon aerogel, and hierarchical carbon materials have been prepared. At the same time, their structure–property relationship and applications have been widely studied. This paper aims to present a review on the recent advances in the controllable preparation and potential applications of BCMs, providing a reference for future work. First, the chemical compositions of typical biomass and their thermal degradation mechanisms are presented. Then, the typical preparation methods of BCMs are summarized and the relevant structural management rules are discussed. Besides, the strategies for improving the structural diversity of BCMs are also presented and discussed. Furthermore, the applications of BCMs in energy, sensing, environment, and other areas are reviewed. Finally, the remaining challenges and opportunities in the field of BCMs are discussed.

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High-Performance Field Emission from a Carbonized Cork

Cited by 15 publications

References 61 publications

Laser‐Induced Graphene Piezoresistive Sensors Synthesized Directly on Cork Insoles for Gait Analysis

Laser‐Induced Graphene Piezoresistive Sensors Synthesized Directly on Cork Insoles for Gait Analysis

High-Performance Field Emitters Based on SiC Nanowires with Designed Electron Emission Sites

Biomass‐Derived Carbon Materials: Controllable Preparation and Versatile Applications

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