Photothermal Deoxygenation of Graphene Oxide for Patterning and Distributed Ignition Applications

Gilje, Scott; Dubin, Sergey; Badakhshan, Alireza; Farrar, Jabari; Danczyk, Stephen A.; Kaner, Richard B.

doi:10.1002/adma.200901902

Cited by 165 publications

(123 citation statements)

References 35 publications

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“…In this regard, GO photoreduction is well documented in the literature. It is often attributed to a photothermal mechanism [17,18,[48][49][50] wherein the absorption of light results in the eventual heating of the sample. This follows from the conversion of excess absorbed energy into thermal energy through non-radiative relaxation.…”

Section: Go Photoreduction Mechanismmentioning

confidence: 99%

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

et al. 2015

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Graphene oxide (GO) is an important material that provides a scalable approach for obtaining chemically derived graphene. Its optical and electrical properties are largely determined by the presence of oxygen-containing functionalities, which decorate its basal plane. This chemical derivatization results in useful properties such as the existence of a band gap as well as emission spanning both the visible and near infrared. Notably, GO's optical and electrical properties can be altered through reduction, which proceeds through the removal of these oxygen-containing functional groups. However, widely variable behavior has been observed regarding the evolution of GO's optical response during reduction. These discrepancies arise from the different reduction methods being used and, in part, from the fact that nearly all prior measurements have been ensemble studies. Consequently, detailed mechanistic studies of GO reduction are needed which can transcend the limitations of ensemble averaging.In this chapter, we show the spectroscopic evolution of GO's optical properties during photoreduction at the single-sheet level. Laser-induced reduction, in particular, offers a unique and potentially controllable method for producing reduced GO (rGO), a material with properties similar to those of graphene. However, given the complexity of GO's photoreduction mechanism, microscopic monitoring of the process is essential to understanding and ultimately exploiting this approach.

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Section: Go Photoreduction Mechanismmentioning

confidence: 99%

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

et al. 2015

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“…During the thermal reduction of GO, some of the partially oxidized graphite turns into the fully oxidized form CO 2 as well as the reduced form GR. Recently, it was reported that even a common camera flash is capable of photothermally reducing GO film at ambient conditions (Cote et al 2009;Gilje et al 2010). It was also reported that GR sheets decorated with nanoparticles of noble metals and transition metal oxides can be prepared through such one-step, domino-like redox reactions by flame treatment using GO film containing metal precursor and potassium salts (Kim, Luo, et al 2010).…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Pt-Nanoparticles-Laden Graphene Crumples by Aerosol Spray Pyrolysis and Evaluation of Their Electrocatalytic Activity

Jang

Kim

Chang

et al. 2013

Aerosol Science and Technology

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Pt-nanoparticles-laden graphene (GR) crumples were directly synthesized from a colloidal mixture of aqueous chloroplatinic acid (H 2 PtCl 6 ) and graphene oxide (GO) sheets via aerosol spray pyrolysis (ASP). Effects of Pt content in the Pt/GR composite and temperature of heating zone on the particle morphology, diffraction pattern, and specific surface area were investigated. The morphology of Pt/GR was the shape of a crumpled sheet of paper and the average size of the composite was around 1.3 µm in diameter. As Pt content increased from 2 to 20 wt%, higher numbers of Pt nanoparticles are observed on the GR at higher Pt content and the specific surface area of the composite also increased from 122 to 146 m 2 /g. Also, the intensity of the GR peak decreased, but that of the Pt peak increased. As temperature increased from 500• C to 900 • C, an increase of the particle size of Pt due to sintering was observed. Electrocatalytic application of the Pt/GR composites was examined through methanol oxidation reaction. The 20 wt% Pt/GR synthesized at 900• C showed higher performance on methanol oxidation than a commercial 20 wt% Pt/carbon black catalyst.

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“…Recently, it has been found that the deoxygenation temperature can be decreased to 150℃ at atmospheric pressure when GO is dispersed in propylene carbonate [8] as well as in a mixture of water and organic solvents [9]. Meanwhile, other novel low-temperature thermal-related reduction methods have also been developed, such as flash re-duction [10,11], laser reduction [12], and hydrothermal and/or solvothermal reduction [13,14]. However, the reduction mechanisms are far from clear and the reaction process need to be further studied.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Kinetic Analysis of Lowtemperature Thermal Reduction of Graphene Oxide

Yin

Xia

et al. 2011

Nano-Micro Lett.

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Abstract:The thermodynamic state and kinetic process of low-temperature deoxygenation reaction of graphene oxide (GO) have been investigated for better understanding on the reduction mechanism by using Differential Scanning Calorimetry (DSC), Thermogravimetry-Mass Spectrometry (TG-MS), and X-ray Photoelectron Spectroscopy (XPS). It is found that the thermal reduction reaction of GO is exothermic with degassing of CO2, CO and H2O. Graphene is thermodynamically more stable than GO. The deoxygenation reaction of GO is kinetically controlled and the activation energy for GO is calculated to be 167 kJ/mol (1.73 eV/atom).

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Photothermal Deoxygenation of Graphene Oxide for Patterning and Distributed Ignition Applications

Cited by 165 publications

References 35 publications

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

One-Step Synthesis of Pt-Nanoparticles-Laden Graphene Crumples by Aerosol Spray Pyrolysis and Evaluation of Their Electrocatalytic Activity

Thermodynamic and Kinetic Analysis of Lowtemperature Thermal Reduction of Graphene Oxide

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