Sequential‐Dependent Synthesis of Bimetallic Silver‐Chromium Nanoparticles for Multichannel Sensing, Logic Computing, and 3 in 1 Information Protection

Abstract

Bimetallic nanomaterials (BNMs) have been used in sensing, biomedicine, and environmental remediation, but their multipurpose and comprehensive applications in molecular logic computing and information security protection have received little attention. Herein, This synthesis method is achieved by sequentially adding reactants under ice bath conditions. Interestingly, Ag‐Cr NPs can dynamically selectively sense anions and reductants in multiple channels. Especially, ClO− can be quantitatively detected by oxidizing Ag‐Cr NPs with detection limits of 98.37 nM (at 270 nm) and 31.83 nM (at 394 nm). Based on sequential‐dependent synthesis process of Ag‐Cr NPs, Boolean logic gates and customizable molecular keypad locks are constructed by setting the reactants as the inputs, the states of the resulting solutions as the outputs. Furthermore, dynamically selective response patterns of the Ag‐Cr NPs can be converted into binary strings to exploit molecular crypto‐steganography to encode, store, and hide information. By integrating the three dimensions of authorization, encryption, and steganography, 3 in 1 advanced information protection based on Ag‐Cr nanosensing system can be achieved, which can enhance the anti‐cracking ability of information. This research will promote the development and application of nanocomposites in the field of information security and deepen the connection between molecular sensing and the information world.

Multimorphological Remoldable Silver Nanomaterials from Multimode and Multianalyte Colorimetric Sensing to Molecular Information Technology

“…For color output, as long as one of NaClO and H 2 O 2 was present (logic input 1), the solution color was not blue purple (logic output 1), corresponding to the OR gate function (Boolean algebra A + B) (Figures D and S10C inset). As long as one of NaClO and H 2 O 2 was present (logic input 1), the solution showed an obvious decrease in absorption and blue shift of λ A (Figure S10C), which can be attributed to both NaClO and H 2 O 2 can make M-AgN be dissolved into Ag + . For A 476nm output, as long as NaClO was present (logic input 1), A 476nm of the solution was greater than threshold 0.82 (logic output 1), corresponding to the YES gate function (Boolean algebra B).…”

“…MIT is an emerging frontier hotspot, including molecular information processing (logic computing), information storage (like DNA data storage), and security protection . With the help of extensible design and stimulus-responsiveness of molecular or nanosystems, some limited examples have been successfully demonstrated for multipurpose applications of sensing, logic computing, or information protection. − How to use simple molecular or nanosystems to build large-scale parallel logic circuits and realize complex logic operations is a direction to pursue . For example, by mining the ability of multichannel and multimatter sensing of molecular or nanosystems, the number of logical inputs and outputs can be effectively increased, to expand the scale of logic operations. ,,, Meanwhile, another emerging direction is how to develop or use molecular or nanosystems to explore the characteristics of the molecular information contained in them, to protect information (such as information encryption and hiding). − Although some molecular or nanosystems have created vitality in molecular computing and information safety, − it still has great challenges, including manufacturing defects, poor functionality, and limited paradigms.…”