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- W67977249 abstract "Abstract Graphite oxide sheets, now called graphene oxide (GO), can be made from chemical exfoliation of graphite by reactions that have been known for more than 150 years with the first instance carried out by B.C. Brodie in 1859. With oxygenated functional groups attached to its basal plane and edges, GO is insulating but can be readily dispersed in water. GO is commonly “reduced” by thermal annealing or chemical reducing agents to partially restore some of the favourable electrical, mechanical and thermal properties of the pristine graphitic sheets. Therefore, following the landmark discovery of graphene in 2004, there has been resurgent interest in this old material as a promising precursor for the large-scale chemical production of graphene. However, apart from making graphene, GO itself has many intriguing properties. For example, GO can be viewed as an unconventional soft material such as a two-dimensional (2D) polymer, anisotropic colloid, membrane, liquid crystal or amphiphile. In this chapter, some new insights into this old material will be discussed. (1) To start, GO has been reported as a flammable material in old literature decades ago, but as a flame retardant in recent studies. Therefore, is GO a flame retardant or fuel for combustion? This conflict is reconciled by examining the synthesis and purification of GO in conjunction with the thermal instability of GO, which also inspired a new facile photothermal technique for reducing and patterning GO, and an improved purification method that can speed up post-synthetic material processing. (2) A new imaging technique named fluorescence quenching microscopy (FQM) is introduced that allows high throughput, high contrast visualization of GO and graphene-based single atomic sheets on arbitrary substrates and even in solution. (3) Unlike commonly described as hydrophilic in literature, GO is actually amphiphilic and can act as surfactant to disperse oil and insoluble solid materials in water. This unveils intriguing pH and size dependent solution properties of GO, and inspires various interfacial assembly techniques for creating GO and graphene superstructures, including some all-carbon composites useful for photovoltaic devices. Effort towards solution processed all-carbon solar cells is introduced. (4) GO sheets can be squeezed into a crumpled paper-ball structure by the isotropic compression field generated by evaporating aerosol droplets. The crumpled GO or graphene balls have unprecedented morphology and properties for ultrafine particles, such as resistance to further compression and aggregation. (5) GO sheets can be viewed as negatively charged walls for constructing massive arrays of nanofluidic ion channels by simply stacking up to a lamellar membrane through filtration. This provides a simple material solution to solve the lithographical challenges for making nanofluidic systems and devices." @default.
- W67977249 created "2016-06-24" @default.
- W67977249 creator A5000228134 @default.
- W67977249 creator A5014633641 @default.
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- W67977249 date "2014-01-01" @default.
- W67977249 modified "2023-10-05" @default.
- W67977249 title "Graphene Oxide: Some New Insights into an Old Material" @default.
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- W67977249 doi "https://doi.org/10.1016/b978-0-08-098232-8.00014-0" @default.
- W67977249 hasPublicationYear "2014" @default.
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