Nanografi Nanotechnology

Graphene oxide refers to a mono-atomic layer material obtained when graphite crystals are oxidized. This is one of the graphene materials that are commercially available because of  its ability to dissolve in water  which makes the oxidation process suitable. In this article, we will talk about the  synthesis, the properties and some of the applications of graphene oxide dispersion in water . Seven Properties of Graphene Oxide Dispersion The properties of a material are defined through its structure, however, this material is very peculiar, since there is no unambiguous model of this material. Graphene Oxide dispersion offers remarkable physical, chemical and mechanical properties that give the opportunity to new applications. Graphene Oxide is amorphous , but, in general, graphene oxide can be described as a two-dimensional sheet containing honeycomb carbon atoms with functional groups of hydroxide and oxygen, unlike the graphene model that seeks to completely re...

Reduced graphene oxide is produced from graphene oxide by ultrasound, chemical or thermal reduction. During the reduction step, most of the oxygen functional groups are removed from graphene oxide, so that the resulting reduced graphene oxide has very similar properties to pure graphene. However,  reduced Graphene Oxide  is not defect-free impure than pure graphene. The main difference between graphene oxide and reduced graphene oxide is the decrease in the ratio of the number of oxygen atoms to that of carbon atoms present in the structure.  This article discusses reduced Graphene Oxide, its properties, production methods, and applications. 9 Core Properties of rGO The core properties of reduced Graphene Oxide are given below: The  electrical conductivity of Reduced Graphene Oxide  is 666,7 S/m. rGO is mainly produced by the chemical reduction method. Reduced Graphene Oxide is black in color. rGO exists in the powder form. rGO is odorless. BET s...

Single-walled carbon nanotubes (SWCNT) , as its name suggests are formed by a single layer of graphite which is arranged in a cylindrical shape. SWCNTs are very important because they have certain properties that other nanotubes do not have. These properties have allowed the creation of interesting applications in different sectors.  This article will discuss the structure, properties, and remarkable properties of SWCNTs. Structure of Single-Walled Carbon Nanotubes The central part of the tube is formed by sp 2  hybridization of carbon atoms, while the ends are formed by a particular distribution of pentagonal and hexagonal rings, which gives the right curvature and allow the closure of the graphitic cylinder. Single-walled Carbon Nanotubes have diameters between 0.7 and 10 nm  (generally less than 2 nm) and a length ranging from a few nm to some μm. Consequently,  SWCNTs  have a high length/diameter ratio and for this reason, they can be considered as "a...

Double-walled carbon nanotubes (DWCNTs)  are formed by two concentric SWCNTs and are therefore called "double-walled" nanotubes. The diameter of the DWCNTs is normally greater than that of the SWNTs, and it grows with the number of walls, being able to reach up to a few tens of nanometers.  They have a variety of applications in different sectors and they will be discussed in detail in this article. Moreover, the structure and properties of DWCNTs are also discussed briefly. Structure of Double Walled Carbon Nanotubes The structure of DWCNTs  consists of two layers of graphite sheets concentrically wounded with a space of 0.36 nm between them, with an external diameter of 10 to 50 nm, where each carbon atom is joined with three others by Sp 2  hybridization, the fourth carbon atom forms weak bond of the Van der Wall type with other graphite sheets. 5 Properties of DWCNTs 1.  Electronically, DWCNTs can behave as semi-metallic, insulating, or meta...