Richard Feynman-1959
In 1959 itself Richard Feynman in his famous lectures quoted about this wonderful nanotechnology as,  “What I want to talk about”, is the problem

of manipulating and controlling things on a small scale……Here is a room… That you can decrease the size of things in a magical way…..

Eric Drexler-1986
Engines of Creation: The Coming Era of Nanotechnology is a  molecular nanotechnology book written by K. Eric Drexler. Drexler imagines a world where the entire Library of Congress can fit on a chip the size of a sugar cube and where universal assemblers, tiny machines that can build objects atom by atom, will be used for everything from medicinal robots that help clear capillaries to environmental scrubbers that clear pollutants from the air.

From converting sunlight into power ,to cleaning oceans and beaches from oil slickes, to monitoring thermal environment and to sensors in the form of biochips built into the human body performing  as lifesavers by self-monitoring & guarding, nanotechnology assures us a lot more!We are very well into the Nanotech Age, where materials are just getting smarter day by day!