SYNTHESIS, CHARACTERIZATION AND STUDIES ON OPTICAL PROPERTIES OF METAL SULPHIDE—ALUMINA NANOCOMPOSITES

Abstract

The human race in materials science is approaching great historical transition through an immense control of structure of matter. The most valuable outcome of recent - research in this field is the creation of an entirely new class of materials called nanophase materials or synonymously nanocrystalline materials or nanostructured materials. • Nanophase materials belong to smallest human made objects, where the properties are significantly and uniquely different. Just a short time ago, micro was the king of materials. From microphones, microwave, microscope to microorganism, microspheres, everywhere micro was better. But Macro Micro Nano the world was waiting for the next (mm) (pm) (nm) dimension of small scale, which is called "nano". Probably it is the " DNA S inthesis 0/1 smallest scale for technology or devices to be build. Because, after -10 this dimension we will arrive to the 0 dimension of isolated atoms. Today, _ 0te most microscale designs have reached almost to their end. To get e c. " - pss oe'ect . " next level of superiority with respect i to properties, quality, 1950 1970 1990 2010 2030 2050 Year and performance we are reaching Figure 1.1: Evolution of science and technology down to nanoscale. The immense and the future [1]. interest for new materials assembly via nanotechnology arose from the understanding that by controlling the size of atomic ensembles in the range of 1- 100 nm, we can change or design the properties of the new assembled materials. Nano business alliance forecasts that the global market for nanotechnology (NT) related products and services would reach one trillion dollars by 2015 and nanotechnology is going to decide the economy of the future world.