Size effects in the resistivity of graphene nanoribbons

Cu2O Photocathodes Modified by Graphene Oxide and ZnO Nanoparticles with Improved Photocatalytic Properties

The modification of photocathodes based on copper(I) oxide (COPC) by coating with ZnO nanoparticles or graphene oxide (GO) with different compositions and morphologies is considered. To cover the catalyst surface with graphene oxide, a technique was proposed via freezing of a sprayed aqueous suspension of graphene oxide followed by sublimation drying under vacuum conditions. This method improves the uniformity of the GO layer in comparison with the traditional drop-casting method and, as a result, improves the photocatalytic properties of the COPC. The influence of the composition and morphology of graphene oxide on the photocatalytic activity and stability of COPC has been established. ZnO nanoparticles and GO particles in contact with copper(I) oxide increase the photocurrent density by the more efficient separation of light-generated charge carriers, providing higher photocathode stability required in photocatalytic water splitting.

Electronic, transport, magnetic and optical properties of graphene nanoribbons review

Low dimensional materials have attracted great research interest from both theoretical and experimental point of view. These materials exhibit novel physical and chemical properties due to the confinement effect in low dimensions. The experimental observations of graphene open a new platform to study the physical properties of materials restricted to two dimensions. This featured article provides a review on the novel properties of quasi one-dimensional (1D) material known as graphene nanoribbon. Graphene nanoribbons can be obtained by unzipping carbon nanotubes (CNTs) or cutting the graphene sheet. Alternatively, it is also called the finite termination of graphene edges. It gives rise different edge geometries namely zigzag and armchair among others. There are various physical and chemical techniques to realize these materials. Depending on the edge type termination, these are called the zigzag and armchair graphene nanoribbons (ZGNR and AGNR). These edges play an important role in controlling the properties of graphene nanoribbons. The present review article provides an overview of the electronic, transport, optical and magnetic properties of graphene nanoribbons. However, there are different ways to tune these properties for device applications. Here, some of them are highlighted such as external perturbations and chemical modifications. Few applications of graphene nanoribbon have and chemical modifications. Few applications of graphene nanoribbon have also been briefly discussed.