▎ 摘　　要

The graphene nanoribbons were created intentionally to be a semiconductor. However, a single-layer of graphene nanoribbons has its performance bottlenecks. Due to these problems, multilayer graphene nanoribbons was created and used for semi-conducting. The objective of this paper is to find out the band structure of a one dimensional four-layer graphene nanoribbons. In this paper, the band structure model of a one dimensional four-layer graphene nanoribbons is established and simulated using Mat lab. The findings show that the band gap of multilayer graphene nanoribbons becomes smaller as the number of layers increases. The one dimensional energy band model for multilayer graphene nanoribbons is used to compute and acquire its band gap energy. Through the use of this energy band model, the paper shows the existence of small band gap for single-layer and bilayer graphene nanoribbons. However, by increasing the number of layers, band gap will disappear. Also the behaviour of three-layer and four-layer graphene nanoribbons is much similar to the metallic materials.