The ultra-rapid synthesis of 2D graphitic carbon nitride nanosheets via direct microwave heating for field emission

Abstract

The 2D g-C3N4 nanosheets were ultra-rapidly prepared via a direct microwave heating approach. The as-synthesized g-C3N4 possessed a large surface area, few stacking layers, a large aspect ratio and an enlarged bandgap. As a consequence, the excellent field emission properties of 2D g-C3N4 nanosheets were exhibited with extremely low turn-on fields.

A Unique Interactive Nanostructure Knitting based Passive Sampler Adsorbent for Monitoring of Hg2+ in Water

“…The FTIR spectra (Figure 2a) shows a series of broad peaks at 3400 and 3000 cm −1 both characteristics of the stretching vibration of the N–H bond [38]. The vibrations imply that residual -NH or -NH 2 groups remain in the as-obtained g-CN nanosheets [39]. Peaks at 1232, 1312, 1433, and 1404 cm −1 correspond to the typical stretching vibration modes of C=N, while bands near 1544 and 1632 cm −1 are ascribed to C–N stretching [40].…”

“…Peaks at 1232, 1312, 1433, and 1404 cm −1 correspond to the typical stretching vibration modes of C=N, while bands near 1544 and 1632 cm −1 are ascribed to C–N stretching [40]. The sharp peak at 807 cm −1 is an out of plane bending vibration characteristic of the tri-s-triazine unit [37,38,39]. The results indicate that amino functionality is still present, and the surface functional groups of g-CN were retained after exfoliation.…”

Quantum Effects Allow the Construction of Two‐Dimensional Co3O4‐Embedded Nitrogen‐Doped Porous Carbon Nanosheet Arrays from Bimetallic MOFs as Bifunctional Oxygen Electrocatalysts

“…[14][15][16] Among 2D materials, carbon-based 2D materials display superior electrical conductivity,h igh carrierm obility,a nd strong structures tability,a nd have great potentials as electrocatalysts. [17][18][19][20][21][22] For example, phosphorus-doped ordered mesoporous carbons, [23] polyaniline-derived N-and O-doped mesoporous carbons, [24] and metal-free electrocatalysts assembled from carbon nanotubes andg raphene [25] have been reported to promote ORR activities. Meanwhile, nitrogen-doped graphene frameworks, [26] nitrogen and oxygen dual-doped carbon hydrogel films, [27] and Fe 3 O 4 -decorated Co 9 S 8 nanoparticles in situ grown on reduced graphene oxide [28] have also been used to improveO ER performances.…”

“…Two‐dimensional (2D) inorganic materials possess unique structural features, such as high anisotropy, expanded surface area, macroscopic ultra‐thinness, and flexibility, which not only allow a high density of surface active sites but also endows excellent mechanical and electronic properties . Among 2D materials, carbon‐based 2D materials display superior electrical conductivity, high carrier mobility, and strong structure stability, and have great potentials as electrocatalysts . For example, phosphorus‐doped ordered mesoporous carbons, polyaniline‐derived N‐ and O‐doped mesoporous carbons, and metal‐free electrocatalysts assembled from carbon nanotubes and graphene have been reported to promote ORR activities.…”

Copyrolysed C3N4‐Ag/ZnO Ternary Heterostructure Systems for Enhanced Adsorption and Photocatalytic Degradation of Tetracycline

“…However, low levels of visible‐light utilization efficiency and fast recombination of photogenerated electron‐hole pairs in pure g‐C 3 N 4 hinder the widespread practical application of this material , . To address these issues, multiple strategies have been employed to enhance the photocatalytic performance of g‐C 3 N 4 ; such approaches include the construction of mesoporous structures, doping with metal or nonmetal species, surface modification, and sensitizing with organic dyes and quantum dots , . Of the diverse range of attempts at modification, heterostructure development with compatible semiconductors has led to unprecedented opportunities to favorably explore the photocatalytic activity of g‐C 3 N 4 , …”