2-dimensional (2D) materials have attracted increasing attention in recent years due to novel properties and potential for industrial application. With the rapid developments of both top-down and bottom-up synthesis methods, a lot of new 2D materials beyond graphene have been uncovered, such as BN sheet, silicene, graphdiyne, transition metal chalcogenides and black phosphorus etc. This issue brings along 5 reviews and 7 research papers and discusses the synthesis, properties, band structure modulation, and quantum transport in various 2D materials.