Biogenic fluorescent carbon dots modulated fabrication of concatenate logic library and pattern-mediated molecular keypad lock for chemical sensing application

In recent years, molecular logic gates (MLGs) have gained much attention among researchers to replace con-ventional silicon-based electronic computers. MLGs are employed for various applications, including bio-logical-chemical sensors, heavy metal ion detection, illness diagnosis, and therapy. In this work, we developed two different chemically functionalized forms of biogenic Carbon (C)-dots synthesized using F. religiose and applied as MLGs for multi-stimulus responsive computing. To mimic the operation of Boolean logic gates, we combined as-synthesized three different C-dot platforms (including bulk C-dots, thiol-functionalized (TC)-dots, and acid-functionalized (AC)-dots) with other analytes such as Fe3+, Hg2+, ascorbic acid (AA), glucose (Glu), dichlorvos (DV), and H2O2 and integrated to build a logic library that represents 15 fundamental logic gates (IMP, INH, NOT, NOR, YES, PASS0, and PASS1) and their combinational operations (IMP-OR, IMP-INH, INH-OR). Furthermore, we have developed a parity checker that distinguishes 0 to 9 natural integers as even or odd by using dual-source responsive C-dots and AC-dots platforms. Further, because of the lack of studies using C-dots in "On-Off-On" and "Off-On-Off" sensing to generate logic computation, we have developed a swiping pattern -mediated molecular keypad lock to promise the confidentiality, integrity, and availability of discrete informa-tion. A novel design idea for an advanced molecular keypad lock has been proposed based on the dynamic switching of C-dots photoluminescence emission (PLE) with 9 input keys and 6 input key combinations. The keypad lock can be potentially used in different fields, such as electronic gadgets, security systems, sensors, and therapeutics. This is an approach to replacing conventional silicon-based electronic systems with PLE-based nanoforms.