A nanometer is a billionth of a meter.Nanotechnology is not a new science.HISTORY OF NANOTECHNOLOGYA roman cup of prehistoric times using nanoparticles to givesdifferent colors at different times of the day.
INTRODUCTION:Number of Nano Technology sensors published per year until 2011
Nanosensors are sensing devices with atleast one of theirsensing dimensions being not greater than 100nm.3 broad categories:1. Optical nanosensors.2. Electromagnetic nanosensors.3. Mechanical/vibrational nanosensors.INTRODUCTION TO NANOSENSORS
BASIC PRINCIPLE OF WORKING OF OPTICAL NANOSENSORS