Evolution, structure, and electrical performance of voltage-reduced graphene oxide

Faucett, Austin C.; Flournoy, Jaymes N.; Mehta, Jeremy S.; Mativetsky, Jeffrey M.

doi:10.1016/j.flatc.2016.10.003

Cited by 34 publications

(32 citation statements)

References 55 publications

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“…[125,126] At the cathode, H + , along with electrons injected from the electrode, react with oxygen-bearing groups in GO, such as hydroxyls, carbonyls, and epoxides, resulting in the liberation of oxygen removal from the GO. [127] In this way, a voltage-induced reduction propagates across the electrode gap in a direction opposite to the direction of the electric field. A gradient in the concentration of oxygen functional groups appears in the direction of the electric field between the two electrodes, forming asymmetric GO.…”

Section: Graphene Megs With Instananeous Electrical Outputmentioning

confidence: 99%

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

et al. 2020

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Ongoing efforts to develop this energy have led to the creation of a variety of novel technologies based on photovoltaic, [12,13] piezoelectric, [14,15] triboelectric, [16,17] and thermoelectric principles. [18,19] Devices based on these technologies are readily incorporated into self-powered, battery-free electronic systems. This also acts to eliminate the harm to the environment caused by the use of conventional batteries. [20,21] As recyclable resource, water is not only indispensable to life but also constitutes the largest energy carrier on Earth (Figure 1a). As 71% of the Earth's surface is covered by water and 35% of solar energy incident on the Earth is absorbed by water, petawatts of energy are received in this way. [22] As the water resource is clean and sustainable, the energy contained in even a small fraction of the water on Earth can meet the current global energy demand if this energy can be efficiently harvested. Terrestrial water exists in vapor and liquid form including moisture, rain, clouds, lakes, rivers, and oceans. It also forms the basis for biological systems. Even though there is a long history of electricity generation from running water, most technologies only utilize the gravitational and kinetic energy in liquid water. [23] Such systems are inherently incompatible with the development of self-powered devices. The development of nanomaterials has enabled technology for the extraction of electrical energy from moisture, leading to The exploration of the utilization of sustainable, green energy represents one way in which it is possible to ameliorate the growing threat of the global environmental issues and the crisis in energy. Moisture, which is ubiquitous on Earth, contains a vast reservoir of low-grade energy in the form of gaseous water molecules and water droplets. It has now been found that a number of functionalized materials can generate electricity directly from their interaction with moisture. This suggests that electrical energy can be harvested from atmospheric moisture and enables the creation of a new range of self-powered devices. Herein, the basic mechanisms of moisture-induced electricity generation are discussed, the recent advances in materials (including carbon nanoparticles, graphene materials, metal oxide nanomaterials, biofibers, and polymers) for harvesting electrical energy from moisture are summarized, and some strategies for improving energy conversion efficiency and output power in these devices are provided. The potential applications of moisture electrical generators in self-powered electronics, healthcare, security, information storage, artificial intelligence, and Internet-of-things are also discussed. Some remaining challenges are also considered, together with a number of suggestions for potential new developments of this emerging technology.

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Section: Graphene Megs With Instananeous Electrical Outputmentioning

confidence: 99%

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

et al. 2020

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“…This can be done by the evaluation of the sp 2 carbon fraction, since the optical and electrical properties are mostly governed by the -electrons from sp 2 carbon atoms [19,20]. Several techniques for GO reduction have been reported, including thermal annealing in vacuum [21] or inert atmosphere [22], electrical reduction [23], chemical reduction by hydrazine [21,24] or acids [25], and reduction by UV light [26]. Interestingly, with the degree of reduction, the work function of graphene layers can be fine-tuned from 5.2 to 4.5 eV [27]; thus graphene oxide can be used as a holetransporting selective electrode; inasmuch as superior p-type behavior with hole mobilities up to 0.59 cm 2 V −1 s −1 in thinfilm transistors has been reported [28].…”

Section: Introductionmentioning

confidence: 99%

Physical Properties Investigation of Reduced Graphene Oxide Thin Films Prepared by Material Inkjet Printing

Schmiedova

Pospı́šil

Коваленко

et al. 2017

Journal of Nanomaterials

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The article is focused on the study of the optical properties of inkjet-printed graphene oxide (GO) layers by spectroscopic ellipsometry. Due to its unique optical and electrical properties, GO can be used as, for example, a transparent and flexible electrode material in organic and printed electronics. Spectroscopic ellipsometry was used to characterize the optical response of the GO layer and its reduced form (rGO, obtainable, for example, by reduction of prepared layers by either annealing, UV radiation, or chemical reduction) in the visible range. The thicknesses of the layers were determined by a mechanical profilometer and used as an input parameter for optical modeling. Ellipsometric spectra were analyzed according to the dispersion model and the influence of the reduction of GO on optical constants is discussed. Thus, detailed analysis of the ellipsometric data provides a unique tool for qualitative and also quantitative description of the optical properties of GO thin films for electronic applications.

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“…Electrical reduction of GO has been studied in many research with different setups [22][23]. In this study, the reduction of GO to rGO is also observed according to X-ray photoelectron spectroscopy (XPS) and X-ray Diffraction (XRD) spectra as shown in Figure 3.…”

Section: Materials Characterizationmentioning

confidence: 92%

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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Evolution, structure, and electrical performance of voltage-reduced graphene oxide

Cited by 34 publications

References 55 publications

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

Moisture‐Enabled Electricity Generation: From Physics and Materials to Self‐Powered Applications

Physical Properties Investigation of Reduced Graphene Oxide Thin Films Prepared by Material Inkjet Printing

All-Carbon Based Flexible Humidity Sensor

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