Type

Journal Article

Authors

Hongzhou Zhang
Jonathan N Coleman
Arlene O'Neill
Cornelia Rodenburg
Yangbo Zhou
Pierce Maguire
Daniel S Fox

Subjects

Physics

Topics
fabrication graphene nitrogen low energy two dimensional electron growth rate lattice structure

Sub-5 nm graphene nanopore fabrication by nitrogen ion etching induced by a low-energy electron beam. (2016)

Abstract A flexible and efficient method to fabricate nanopores in graphene has been developed. A focused, low-energy (5 keV) electron beam was used to locally activate etching of a graphene surface in a low pressure (0.3 Pa) N2 environment. Nanopores with sub-5 nm diameters were fabricated. The lattice structure of the graphene was observed to recover within 20 nm of the nanopore edge. Nanopore growth rates were investigated systematically. The effects of nitrogen pressure, electron beam dwell time and beam current were characterised in order to understand the etching mechanism and enable optimisation of the etching parameters. A model was developed which describes how the diffusion of ionised nitrogen affects the nanopore growth rate. Etching of other two-dimensional materials was attempted as demonstrated with MoS2. The lack of etching observed supports our model of a chemical reaction-based mechanism. The understanding of the etching mechanism will allow more materials to be etched by selection of an appropriate ion species.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Hongzhou Zhang, Jonathan N Coleman, Arlene O'Neill, Cornelia Rodenburg, Yangbo Zhou, Pierce Maguire, Daniel S Fox

Experts in our system

1
Hongzhou Zhang
Trinity College Dublin
Total Publications: 50
 
2
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
3
Arlene O'Neill
Trinity College Dublin
Total Publications: 25
 
4
Cornelia Rodenburg
Trinity College Dublin
Total Publications: 3
 
5
Yangbo Zhou
Trinity College Dublin
Total Publications: 10
 
6
Pierce Maguire
Trinity College Dublin
Total Publications: 11
 
7
Daniel Fox
Trinity College Dublin
Total Publications: 15