Fully Rollable Transparent Nanogenerators Based on Graphene Electrodes

Choi, Dukhyun; Choi, Min-Yeol; Choi, Won Mook; Shin, Hyu-Soung; Park, Hyunkyu; Seo, Ju-Seok; Park, Jongbong; Yoon, Sang Youl; Chae, Seung Jin; Lee, Young Hee; Kim, Sang Woo; Choi, Jae‐Young; Lee, Sang Yoon; Kim, Jong Min

doi:10.1002/adma.200903815

Cited by 295 publications

(161 citation statements)

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“…Single-layer graphene on 188-mm thick PET substrate was prepared by transferring chemical vapour-deposited graphene on Cu foil to PET based a roll-to-roll production method described elsewhere [38][39][40] . Briefly, coarse-grain copper foil was heated to 1,000°C, and then a flowing gas mixture of CH 4 and H 2 was introduced at 460 mtorr and 8 sccm for 30 min, followed by rapid cooling to room temperature under flowing H 2 .…”

Section: Methodsmentioning

confidence: 99%

“…As schematically illustrated in Fig. 4a, the singlelayer graphene on the 188-mm thick polyethylene terephthalate (PET) substrate was prepared by transferring the chemical vapour-deposited graphene on Cu foil to PET via a roll-to-roll production method described elsewhere [38][39][40] . The Raman spectrum clearly proves that the obtained graphene is single layer (Fig.…”

Section: Synthesis and Microscopy Characterizations Of 2d Nanosheetsmentioning

confidence: 99%

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Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

et al. 2014

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Two-dimensional (2D) transition metal oxide systems present exotic electronic properties and high specific surface areas, and also demonstrate promising applications ranging from electronics to energy storage. Yet, in contrast to other types of nanostructures, the question as to whether we could assemble 2D nanomaterials with an atomic thickness from molecules in a general way, which may give them some interesting properties such as those of graphene, still remains unresolved. Herein, we report a generalized and fundamental approach to molecular self-assembly synthesis of ultrathin 2D nanosheets of transition metal oxides by rationally employing lamellar reverse micelles. It is worth emphasizing that the synthesized crystallized ultrathin transition metal oxide nanosheets possess confined thickness, high specific surface area and chemically reactive facets, so that they could have promising applications in nanostructured electronics, photonics, sensors, and energy conversion and storage devices.

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Section: Methodsmentioning

confidence: 99%

Section: Synthesis and Microscopy Characterizations Of 2d Nanosheetsmentioning

confidence: 99%

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

et al. 2014

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“…Recently, a series of rationally designed nanogenerators (NGs) with piezoelectric nanowires (NWs) have shown great potentialtoscavengetinyandirregularmechanicalenergy. [8][9][10][11][12][13][14][15] However, insufficient electric output hinders their practical applications. We report here a simple and effective approach, named scalable sweeping-printing-method, for fabricating flexible high-output nanogenerator (HONG).…”

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confidence: 99%

Flexible High-Output Nanogenerator Based on Lateral ZnO Nanowire Array

et al. 2010

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We report here a simple and effective approach, named scalable sweeping-printing-method, for fabricating flexible highoutput nanogenerator (HONG) that can effectively harvesting mechanical energy for driving a small commercial electronic component. The technique consists of two main steps. In the first step, the vertically aligned ZnO nanowires (NWs) are transferred to a receiving substrate to form horizontally aligned arrays. Then, parallel stripe type of electrodes are deposited to connect all of the NWs together. Using a single layer of HONG structure, an open-circuit voltage of up to 2.03 V and a peak output power density of ∼11 mW/cm 3 have been achieved. The generated electric energy was effectively stored by utilizing capacitors, and it was successfully used to light up a commercial light-emitting diode (LED), which is a landmark progress toward building self-powered devices by harvesting energy from the environment. This research opens up the path for practical applications of nanowire-based piezoelectric nanogeneragtors for self-powered nanosystems.KEYWORDS Nanogenerator, ZnO, nanowire, light-emitting diode, self-powering E nergy harvesting is critical to achieve independent and sustainable operations of nanodevices, aiming at building self-powered nanosystems. 1-3 Taking the forms of irregular air flow/vibration, ultrasonic waves, body movement, and hydraulic pressure, mechanical energy is ubiquitously available in our living environment. It covers a wide range of magnitude and frequency from cell contraction to ocean waves. The mechanical-electric energy conversion has been demonstrated using piezoelectric cantilever working at its resonating mode. [4][5][6][7] However, the applicability and adaptability of the traditional cantilever based energy harvester is greatly impeded by the large unit size, large triggering force and specific high resonance frequency. Recently, a series of rationally designed nanogenerators (NGs) with piezoelectric nanowires (NWs) have shown great potentialtoscavengetinyandirregularmechanicalenergy. [8][9][10][11][12][13][14][15] However, insufficient electric output hinders their practical applications. We report here a simple and effective approach, named scalable sweeping-printing-method, for fabricating flexible high-output nanogenerator (HONG). An open-circuit voltage of up to 2.03 V and a peak output power density of ∼11 mW/cm 3 have been achieved. The generated electric energy was effectively stored by utilizing capacitors, and it was successfully used to light up a commercial lightemitting diode (LED), which is a landmark progress toward building self-powered devices by harvesting energy from the environment. Furthermore, by optimizing the density of the NWs on the substrate and with the use of multilayer integration, a peak output power density of ∼0.44 mW/cm 2 and volume density of 1.1 W/cm 3 are predicted.The mechanism of converting mechanical energy by a single ZnO NW that is laterally bonded to a substrate has been discussed in details in our previous rep...

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“…Zinc oxide (ZnO) has been widely used in photocatalysts , solar cells , transistors (Ong et al 2007), piezoelectric transducers (Choi et al 2010), and gas sensors (Spencer and Yarovsky 2010). The II-VI compound semiconductor has outstanding electrical and optical properties (Cho et al 2009) as well as excellent chemical and thermal stabilities.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Flower-like ZnO Nanoparticles in a Cellulose Hydrogel Microreactor

Qin

Jiang

et al. 2017

BioResources

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*Flower-like zinc oxide (ZnO) nanoparticles were synthesized with sodium hydroxide and zinc acetate in a cellulose hydrogel microreactor (prepared by the inversion method). The samples were characterized by scanning electron microscopy, EDX, x-ray diffractometry, ultravioletvisible diffuse reflection spectroscopy, and nitrogen adsorptiondesorption. The results indicated that ZnO grows in a flower-like shape in the pores of the cellulose hydrogel. The pure hexagonal wurtzite structures have uniform diameters in the range of 10 nm to 30 nm, surface areas of 39.18 m 2 /g, and pore volumes of 0.2109 cm 3 /g. This study also investigated the photocatalytic properties. The nanoparticles have a band gap of 3.23 eV and a 95.2% efficiency for the ultraviolet degradation of rhodamine B over 3 h at room temperature.

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Fully Rollable Transparent Nanogenerators Based on Graphene Electrodes

Cited by 295 publications

References 46 publications

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets

Flexible High-Output Nanogenerator Based on Lateral ZnO Nanowire Array

Preparation of Flower-like ZnO Nanoparticles in a Cellulose Hydrogel Microreactor

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