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- 저자 : Controllable synthesis of reduced graphene oxide (검색결과 2 건)
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Controllable synthesis of reduced graphene oxide
Controllable synthesis of reduced graphene oxide,Li Fang 한국물리학회 2016 Current Applied Physics Vol.16 No.9
A controllable fabrication of reduced Graphite oxide (RGO) via different alcohols was reported. Characterized and analyzed by X-ray diffraction, fourier transform infrared spectroscopy, UVevisible spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and cyclic voltammetry, the chemical and structural properties, together with the electroconductivities of the RGOs fabricated by ethanol (EtOH), 1-propanol (PrOH), 1-butanol (BuOH) and benzyl alcohol (PhOH) were investigated systemically. The results showed that the reduction degree of GO was strongly dependent on the type of alcohol. The strongest reducibility of PhOH was attributed to the special activity of the benzyl hydrogen of PhOH in comparison with the other primary alcohols. Meanwhile, the reducibility of the primary alcohols decreased with the elongation of carbon chain, which might be explained by the gradual attenuation of hydrogen donation ability and the increase of steric hindrance. The reducibility order of the investigated alcohols was determined as RGO(PhOH) > RGO(EtOH) > RGO(PrOH) > RGO(BuOH), indicating the potential controllability of the RGOs reduced by different alcohols for special use. In addition, the electrical conductivity of RGO(PhOH) was found to be similar to that of Graphite.
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Graphene quantum dots and their possible energy applications: A review
Controllable synthesis of reduced graphene oxide,Li Fang,YOUNG HEE LEE 한국물리학회 2016 Current Applied Physics Vol.16 No.9
As new carbon-based materials, graphene quantum dots (GQDs) many advantages due to the additional unique properties that arise from their nanoscale small size. GQDs are expected to be suitable for various applications. For use of GQDs in various fields, mass production is critically required. To date, many methods for preparing GQDs with good properties and high yield have been introduced. The main synthesis strategies are known as bottom-up and top-down methods. Synthesis of GQDs from small organic molecules, known as the bottom-up approach, is appropriate for controlling the size of GQDs but requires multistep organic reactions and purification at each step. However, the top-down approach of breaking the carbon-carbon bonds of a large carbon source is easy and simple, and therefore suitable for mass production. Here, we briefly introduce the solution-process synthesis of GQDs using a top-down method and recent energy-related applications such as capacitors, lithium ion batteries, and solar cells.
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