CARBON NANOTUBEINTRODUCTIONAdvancements in materials science over the past decade have allowed scientists to create two carbon structures, namely carbon nanotubes and carbon nanowires. Nanowires are small wires with a diameter of no more than 1 nanometer. These are used to build tiny, more efficient transistors for computer chips and other electronic devices. In recent years, carbon nanotubes have somewhat eclipsed nanowires. A carbon nanotube is a cylinder filled with carbon atoms. To put it more simply, nanotubes are simply hexagonally shaped sheets of carbon atoms. If this sheet is rolled into a cylinder shape, you get a carbon nanotube. The properties of this carbon nanotube depend on how the sheet is rolled. Although they are formed from the same sheet of graphite, their properties depend on variations in length, thickness, type of helical structure and number of layers. Carbon nanotubes with their astonishing strength, thermal and electrical properties are compounded to have a significant impact on future materials sciences, electronics and nanotechnology. Due to their specialized structures, carbon nanotubes can be used to create very thin energy storage devices that could bring a new dimension and replace the capacitors and batteries that currently exist. Research on carbon nanotubes is progressing and discovering new forms, applications and solar thermal storage is the result of one such research. TYPES OF CARBON NANOTUBES Single-walled carbon nanotubes (SWNT) A sheet of graphite rolled into a tube with a singular cylindrical wall is called a SWNT. These are normally blocked at the ends. They have a diameter close to 1 nm. However, they come in different forms of paper and the length of time they can store it for and these can be controlled independently. The basic principle of thermochemical solar energy storage is that it uses a molecule whose structure changes upon exposure to sunlight and which can remain stable in that form for so long. By disrupting it with a stimulus, a catalyst, a small change in temperature or a flash of light, it can quickly return to its original form by releasing its stored energy in the form of heat. The main advantage of this approach to harnessing solar energy is that the process is simplified by combining energy collection and storage in a single step. This process is robust, stable and cheap. A limitation of this process is that, although it is useful for heating applications, generating electricity would require another step using thermoelectric devices or producing steam to operate a generator..