Abstract
Recently, graphene nanomesh (GNM) has attracted great attentions due to its unique porous structure, abundant active sites, finite band gap and possesses potential applications in the fields of electronics, gas sensor/storage, catalysis, etc. Therefore, diverse GNMs with different physical and chemical properties are required urgently to meet different applications. Herein we demonstrate a facile synthetic method based on the famous Fenton reaction to prepare GNM, by using economically fabricated graphene oxide (GO) as a starting material. By precisely controlling the reaction time, simultaneous regulation of pore size from 2.9 to 11.1 nm and surface structure can be realized. Ultimately, diverse GNMs with tunable band gap and work function can be obtained. Specially, the band gap decreases from 4.5–2.3 eV for GO, which is an insulator, to 3.9–1.24 eV for GNM-5 h, which approaches to a semiconductor. The dual nature of electrophilic addition and oxidizability of HO• is responsible for this controllable synthesis. This efficient, low-cost, inherently scalable synthetic method is suitable for provide diverse and optional GNMs, and may be generalized to a universal technique.
Highlights
The optical gap of reduced graphene oxide and the atomic ratio of O/C32,33, and the different roles of each oxygen functional groups in the optical gap regulation of rGO34
The Fenton reaction has been successfully employed to investigate the effect of hydroxyl radical (HO) on the surface structure of multi-walled carbon nanotubes (MWNTs) and fabricate graphene quantum dots (GQDs)[41,42]
In this work, inspired by the effective reaction between carbonaceous materials and Fenton reagent in the previous works, we present a facile fabrication of diverse Graphene nanomesh (GNM) with simultaneously adjustable pore size and surface structure by using a ferrioxalate-mediated photo-Fenton method
Summary
The optical gap of reduced graphene oxide (rGO) and the atomic ratio of O/C32,33, and the different roles of each oxygen functional groups in the optical gap regulation of rGO34. It is highly desirable to develop an effective method for mass preparation of versatile GNMs combining variable pore size and surface structure, providing diverse and optional band gap and surface chemical activity to match different applications. In this work, inspired by the effective reaction between carbonaceous materials and Fenton reagent in the previous works, we present a facile fabrication of diverse GNMs with simultaneously adjustable pore size and surface structure by using a ferrioxalate-mediated photo-Fenton method. This universal synthetic method overcomes the obstacles of zero band gap and chemical inertness of graphene simultaneously, and exploring their potentials for wide application
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