Nitrogen‐Doped Single Graphene Fiber with Platinum Water Dissociation Catalyst for Wearable Humidity Sensor

Choi, Seon‐Jin; Yu, Hayoung; Jang, Ji‐Soo; Kim, Min-Hyeok; Kim, Sang-Joon; Jeong, Hyeon Su; Kim, Il‐Doo

doi:10.1002/smll.201703934

Cited by 112 publications

(78 citation statements)

References 55 publications

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“…A great deal of research has been devoted to wearable sensors capable of detecting humidity changes . rGO fibers have been developed as highly sensitive humidity sensors . To increase the electrical properties of the rGO film, nitrogen reduction was performed to dope the rGO film as n‐type.…”

Section: Applicationsmentioning

confidence: 99%

“…Flexible sensors are especially suited for novel applications in healthcare, which are represented by noninvasive, measurement and real‐time monitoring of biophysical and biochemical signals from the human body, such as wrist pulse monitoring, strain measurement, humidity measurement, vibration detection, touch and pressure measurement, electrochemical detection, body temperature measurement, and many others. Table shows the flexible sensors, materials used, their performance, and applications.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Patterning Methods of Flexible Sensors Using Carbon Nanomaterials on Polymers

Costa

Choi

2020

Advanced Intelligent Systems

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Flexible sensors composed of carbon nanostructures and elastic materials have been developed for healthcare monitoring, environmental monitoring, disposable biochemical or electrochemical sensors, and many other applications. Fabrication approaches for such sensors and their advantages and current issues related to patterning high-performance flexible sensors are reviewed. A focus is placed on patterning techniques for carbon-based flexible sensors including carbon nanotubes, graphene, and other carbon nanostructures. First, novel patterning techniques for nanomaterials are described, along with their current challenges. Next, emerging flexible sensors including humidity, temperature, strain, and pressure sensors are discussed. Finally, the challenges and perspectives for flexible sensors are addressed. REVIEW www.advintellsyst.com

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Section: Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Patterning Methods of Flexible Sensors Using Carbon Nanomaterials on Polymers

Costa

Choi

2020

Advanced Intelligent Systems

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“…Among these, graphene and its functionalized materials have shown the excellent performance in the field of water related applications, such as humidity sensing and water purification [10][11][12]. Graphene oxide (GO) and its reduced form, reduced graphene oxide (rGO), contain hydrophilic groups, such as hydroxyl, epoxy, and carboxyl, allowing faster and easier water molecule adsorption compared with other graphene-based materials [13][14][15]. In addition, the unique p-type semiconducting property of rGO enables the measurement of relative humidity by simply monitoring the change of material electrical capacitance [16][17].…”

Section: Introductionmentioning

confidence: 99%

All-Carbon Based Flexible Humidity Sensor

Huang

Nie

et al. 2019

j nanosci nanotechnol

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Flexible humidity sensors play important roles in wearable devices and consuming electronics which provide a convenient way between digital and physical worlds. This work presents an easy fabricated method for flexible humidity sensors all based on carbon material including electrodes and functional layers. The interdigital electrodes are made by direct laser writing on commercial Kapton tapes and the transferring to flexible Polydimethylsiloxane (PDMS) substrates. The humidity sensing material is reduced graphene oxide (rGO) in nanometer thickness by electrospray. The rGO flakes covered the micro-size laser induced graphite (LIG), forming rGO-graphite balls, dramatically increase surface areas to interact with water molecules. The results show high precision sensitivity and fast response time for adsorption (0.9 s) and desorption (4.5 s). This method provides a novel method for fabricating cost-effective flexible humidity sensors.

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“…Even greater mechanical (≈270 Mpa) and electrical properties (≈10 500 S m −1 ) could be achieved via thermal annealing post processing which converts graphene oxide to reduced graphene oxide . The thermally reduced graphene‐based fibers could be applied to various applications such as photovoltaic wires, humidity sensor, triboelectric nanogenerator for neural differentiation enhancement, and stem cell expansion scaffold …”

Section: Introductionmentioning

confidence: 99%

Wet‐to‐Dry Hybrid Spinning of Graphene Fiber Inspired by Spider Silk Production Mechanisms

Lee

Seo

et al. 2018

Adv Materials Inter

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modified graphene (i.e., graphene oxide). [3] In detail, oppositely charged, cationic small molecules or polymers are dissolved in a solution bath, and a stream of GO solution is injected. The cationic components electrostatically cure the injected individual GO molecules to form thin, continuous fibers. For the cationic components, cetyltrimethylammonium bromide (CTAB), [4] calcium chloride, [5] and chitosan, [6] have been used as GO coagulating reagents in a bath. The GO fibers produced via the above methods showed high mechanical strength (≈180 Mpa) and high electrical behaviors (≈3500 S m −1 ). [4] Even greater mechanical (≈270 Mpa) and electrical properties (≈10 500 S m −1 ) could be achieved via thermal annealing post processing which converts graphene oxide to reduced graphene oxide. [5] The thermally reduced graphene-based fibers could be applied to various applications such as photovoltaic wires, [7] humidity sensor, [8] triboelectric nanogenerator for neural differentiation enhancement, [9] and stem cell expansion scaffold. [10] However, wet spinning has intrinsic disadvantages because the entire spinning process should occur in solution, which is problematic for scalability. Large, excess volumes of the bath solutions should be used, and furthermore, the solution used for the GO fiber fabrication should be regularly discarded to prevent unavoidable contamination. Additionally, the cationic curing agents gradually decrease as the GO fiber forms, and the bath solution should be discarded below a critical cationic agent concentration point. Thus, developing a dry state spinning strategy is important for scalability.In nature, an efficient method for fibers produced directly from an aqueous solution using dissolved macromolecular building blocks exists. A representative example is the dragline silk spinning process of spiders. Spidroin is an important amphiphilic building block in spider fiber silk, and the unique amphiphilicity of spidroin originates from the alaninerich hydrophobic domains flanked by charged amino acidrich hydrophilic domains. [11] The amphiphilicity of spidroin facilitates inter-protein supramolecular assembly (a "wet" state in spider's body), and the assembled supramolecules are shear aligned by pulling and spinning the solution from a posterior spinneret (a "dry" state in spider's body). [11b,12] Finally, the spun solution is hardened by spontaneous water evaporation.Herein, inspired by the aforementioned wet-to-dry spinning process shown in the spider silk formation, we developed a This study describes a graphene oxide (GO) fiber spinning method that produces a nearly 100% yield for converting a GO suspension into fibers. The fiber formation method is inspired by the spider silk spinning strategy. The dissolved silk protein, spidroin (wet state), is extruded and shear-thinned through a posterior spinneret, exposing the silk to a dry state for curing. The wet-to-dry conversion in a spider spinneret enables nearly all the fiber precursor, spidroin, to be fabricated into a silk fiber ...

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Nitrogen‐Doped Single Graphene Fiber with Platinum Water Dissociation Catalyst for Wearable Humidity Sensor

Cited by 112 publications

References 55 publications

Fabrication and Patterning Methods of Flexible Sensors Using Carbon Nanomaterials on Polymers

Fabrication and Patterning Methods of Flexible Sensors Using Carbon Nanomaterials on Polymers

All-Carbon Based Flexible Humidity Sensor

Wet‐to‐Dry Hybrid Spinning of Graphene Fiber Inspired by Spider Silk Production Mechanisms

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