Pulsed laser assisted reduction of graphene oxide

Huang, Lei; Liu, Yang; Ji, Lechun; Xie, Yuee; Wang, Tao; Shi, Wangzhou

doi:10.1016/j.carbon.2011.01.067

Cited by 208 publications

(155 citation statements)

References 28 publications

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“…Supporting this, temperatures as high as 500°C have been reported in GO samples exposed to high-power flashlamps [17]. Similarly, pulsed lasers in the ultraviolet [51][52][53], visible [51], and NIR [54,55] have all been used to reduce GO. Their short pulses and high peak powers result in estimated sample temperatures exceeding 1,000°C [53,54].…”

Section: Go Photoreduction Mechanismmentioning

confidence: 94%

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: 94%

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

et al. 2015

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“…Such a behaviour is not unexpected and well reported in the literature for the laser photolysis of pure GO dispersions. 28,29 It should be noted, that we do not question the overall photochemical reduction of graphene in ref. 1, such as shown impressively via XPS, but just the molecular mechanism.…”

Section: Discussionmentioning

confidence: 99%

How fast is the reaction of hydrated electrons with graphene oxide in aqueous dispersions?

et al. 2015

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“…This phenomenon is attributed to a partial reduction of the GO suspension immediately after the introduction of ammonia. [ 58 ] …”

Section: Suspensionsmentioning

confidence: 99%

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

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the manipulation of graphene and its derivatives occupy a relatively insignifi cant part, i.e., less than 1%. The fi rst publications on graphene modifi cation with laser irradiation appeared in 2008, however, since 2010, the number of publications has risen exponentially.Graphene oxide (GO) has emerged as a versatile material for nanocarbon research. Several types of oxygen-containing functional groups present on the basal plane, and the sheet edge allows GO to interact with a broad range of organic and inorganic materials. [ 9 ] Furthermore, GO is an abundant and low-cost material synthesized from graphite or graphite oxide; it retains a layered structure but, at the same time, it can be characterized by the loss of electronic conjugation caused by the oxy groups at the edge or plane defects. GO has a potential use in energy, [ 10 ] electronics, [ 11 ] molecular sensing areas, [ 12 ] catalysis, [ 13 ] etc. Moreover, it can be reduced chemically or thermally in order to achieve graphenelike properties. [ 14 ] The material produced during such a procedure is usually referred to as "reduced GO" (rGO). However, residual defects such as remnant oxygen atoms, [ 15 ] Stone-Wales defects (pentagon-heptagon pairs), [ 16 ] and holes [ 17 ] appearing due to the loss of carbon (in the form of CO or CO 2 ) from the basal plane [ 18 ] limit the electronic quality of rGO.A laser is a powerful tool which is used for various applications in industry, medicine, science, and material processing. [ 19 ] It is usually employed in different processes such as ablation, etching, cutting of various materials, as well as direct A dramatic rise in research interest in laser-induced graphene oxide (GO) reduction and modifi cation requires an overview of the most recent works on this subject. Typical methods for the recognition and confi rmation of modifi ed graphene and its derivatives, such as Raman, Fourier-transform infra-red (FTIR), X-ray photoelectron (XP), and ultraviolet-visible (UV-vis) spectroscopies, are introduced briefl y in this review. A major part of the survey is devoted to the main modifi cation ways and the laser parameters used in the literature. A discussion of possible reduction and modifi cation mechanisms is also presented. Recent applications, especially in the biomedical fi eld such as cell therapy treatment, as well as signifi cant results of GO modifi cation, are discussed in detail. Finally, perspectives for the application of laser-induced GO modifi cations in passive THz photonics and biomedicine are briefl y addressed.

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Pulsed laser assisted reduction of graphene oxide

Cited by 208 publications

References 28 publications

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

Spectroscopy and Microscopy of Graphene Oxide and Reduced Graphene Oxide

How fast is the reaction of hydrated electrons with graphene oxide in aqueous dispersions?

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

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