Development of Optical Emission based Molecular Keypad Lock system for Security Applications

Abstract

Molecular-level computing is predicted as one of the best ultimate solutions to overcome the present limitation of computing devices in terms of storage capacity and processing speed. The capacity and reducing the size for information storage and processing technology are rapidly approaching a limit. Substitute materials and operating principles for the expansion and communication of data in electronic circuits and optical networks are must be identified. Their attractive features are the miniaturized dimensions and the high degree of control on molecular design through chemical synthesis. A wide diversity of molecules that respond to various chemical inputs have been synthesized and demonstrated as molecular logic gates. This report covers the recent developments and future perspectives of molecular keypad designs using chemical logic gates with particular emphasis on fluorescent organic molecules. Two families of chemicals are grouped namely; group A and group B. The chemical reaction of a fluorescent organic molecule, 1,1'-(naphthalene-1,8-diyl)-bis(3-(9-oxo-9H-fluoren-1-yl)urea) (1), with group A and group B are tested. Based on the chemical reaction and photophysical property, the output is available as '1' only for certain input combinations and suitable passwords are developed.