Nitrogen-Doped Few-Layer Graphene Grown Vertically on a Cu Substrate via C₆₀/Nitrogen Microwave Plasma and Its Field Emission Properties

Abstract

Vertical few-layer graphene (V-FLG) sheet is expected to be a high field emitter due to its electrical properties and open surface with sharp edges. However, the complicated and tedious preparation method using gaseous carbon-containing precursor limited the universal application of V-FLG. This paper reports a novel, simple, and green method to prepare vertical nitrogen-doped few-layer graphene (V-NFLG) on the metal surfaces that exhibit excellent field emission properties. The V-NFLG was grown on a Cu substrate using C60 as a precursor with the help of a nitrogen microwave plasma. Growth and doping mechanisms for the few-layer graphene are suggested based on microwave plasma emission spectra of C60/nitrogen. The as-prepared NFLG exhibits remarkable field emission performance, with a high field enhancement factor (7430 at the high field), a low turn-on field (1.45 V/μm at 10 μA/cm2), and high stability (within ±4%), showing its great potential for field emission applications.

Fullerene Transformed into a 3-D Structure of Nitrogen-Doped Few-Layer Graphene Sheets: Growth and Field Emission Properties

“…The growth of the 3-D NFLGs was carried out in a microwave excited C 60 /nitrogen plasma process, 29 as illustrated in Figure 1. Briefly, the process can be divided into three steps: (1) C 60 powder was heated by nitrogen plasma and evaporated into C 60 molecules; (2) the evaporated C 60 molecules were opened into C 2 and C−N molecules and flowed into the substrate surface with the nitrogen carrier gas; and (3) the C 2 and C−N molecules were adsorbed and transformed into 3-D NFLGs on a metal substrate.…”

“…Heretofore, 3-D structured nitrogen-doped few-layer graphene sheets (3-D NFLGs) have been prepared using a fullerene C 60 precursor combined with a microwave excited nitrogen plasma process. 29 A deep understanding of the growth mechanism and available regulating of morphology for 3-D NFLGs is urgently needed, which is crucial for its widespread application. In this work, the detailed growth process of 3-D NFLGs, their structural characterization, and the field emission properties of the as-synthesized 3-D structural graphene sheets were studied.…”

“…Heretofore, 3-D structured nitrogen-doped few-layer graphene sheets (3-D NFLGs) have been prepared using a fullerene C 60 precursor combined with a microwave excited nitrogen plasma process . A deep understanding of the growth mechanism and available regulating of morphology for 3-D NFLGs is urgently needed, which is crucial for its widespread application.…”

Tuneable effects of pyrrolic N and pyridinic N on the enhanced field emission properties of nitrogen-doped graphene

“…is a common way to tune the electronic and mechanical properties of graphene, 13,14 thus improving carrier mobility and decreasing the work function. [15][16][17][18][19][20] Thus far, there have been a number of studies on N doping of graphene for the enhancement of field emission properties. Palnitkar et al prepared undoped and N-doped graphene by arc discharge method and found that the N-doped graphene exhibited a lower turn-on field of 0.6 V μm −1 compared to undoped graphene of 0.8 V μm −1 .…”

Microwave Vortex Transceiver System with Continuous Tunability Using Identical Plasmonic Resonators

“…[ 18 ] Vortex beams can also acquire the azimuth information of the radar target, therefore benefiting the novel information‐rich radar for target recognition. [ 19 ] Recently, novel principles and inspiring applications of microwave vortices keep emerging, such as chirality detection, [ 20 ] spinning speed detection, [ 21,22 ] etc.…”