Advancement in liquid exfoliation of graphite through simultaneously oxidizing and ultrasonicating

摘要: Layered crystals, once exfoliated in liquids, create nanosheets with large surface area and likely generate electron band gaps. The current liquid exfoliation of graphite is performed by either oxidation, ultrasonication or the oxidation followed ultrasonication; these methods are respectable but have limitations general: actually produces graphene oxide while sonication time-consuming a low yield. In this paper we report highly effective yet simple approach for fabrication high-quality graphene; consists simultaneously oxidizing ultrasonicating merely 60 min, washing filtration. Exfoliation was markedly promoted simultaneous treatment, where 80% sheets comprise single few layers lateral dimensions ranging 50 nm to over 100 nm; their carbon oxygen ratio at 8.85; Raman D- G-band intensity as 0.211; can be stably dispersed acetone least 48 hours they an electrical conductivity 600 S cm−1. A thin film made casting exhibited sheet resistance ∼1000 Ω square−1 transparency 550 nm.