Facile synthesis of diverse graphene nanomeshes based on simultaneous regulation of pore size and surface structure

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.

Structure and solvents effects on the optical properties of sugar-derived carbon nanodots

“…The observed G band is clearly asymmetric which, on the lower wavelength side of the peak in nanoscale systems, is usually associated with the phonon confinement 49 , thus suggesting that the particle size is sufficiently small for bulk phonon dispersion description to break down. It is worth pointing out, that our glucose CNDs samples show Raman signal very similar to that observed in graphene oxide 50 – 53 , which may suggest significant contribution of out-of-plane bonding.…”

Doping of large-pore crown graphene nanomesh

“…Experimental work on GNM's currently achieves pore diameters as small as 3 nm. [23] Therefore, we have to consider multiple dopants per pore, studying the details of their packing and stability for near term applications. These studies also provide a framework for understanding the behavior of dopant ionic complexes for chemical separation applications.…”

“…[17] GNMs have been fabricated by several groups, with pore-size distributions in the 3-200 nm range. [21][22][23][24] A study of the I-V characteristics of p-doped GNM-based transistors indicated that their ON-OFF ratio is an order of magnitude larger than that of pristine graphene, but with lower electrical conductivity. Most recently, sub-nanometer pores were fabricated, albeit without the periodicity necessary for transport application.…”

Oxygen Clusters Distributed in Graphene with “Paddy Land” Structure: Ultrahigh Capacitance and Rate Performance for Supercapacitors

“…However, driving these redox reactions of oxygen functional groups needs necessarily conductive network (sp 2 carbon) in RGO, especially at high scan rates. Therefore, the specific surface area, oxygen concentrations, and electrical conductivity of RGO play crucial roles in electrochemical performance for supercapacitors …”