Contrary logic pairs and circuits using a visually and colorimetrically detectable redox system consisting of MoO3-x nanodots and 3,3′-diaminobenzidine
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Logic systems that yield two or more signal outputs in the presence of the input are scarce. A universal logic system consisting of plasmonic MoO3-x nanodots and 3,3′-diaminobenzidine (DAB) for fabrication of visual contrary logic pairs and circuits are presented here. They do not require the use of expensive instrumentation but can be visually read. It is based on the facts that the blue dispersion of MoO3-x nanodots turns to colorless after oxidation, while the colorless reagent DAB is oxidized by various oxidants to generate a brown color. On this basis, the complete contrary logic pairs and circuits such as YES-NOT, AND-NAND, OR-NOR, XOR-XNOR, INH-IMH, and MAJ-MIN can be fabricated. Various oxidants serve as inputs, and absorbances as outputs. A smart logic voting system with “one-vote deny” function is also described that is based on the cascade of MAJ logic circuit and INH logic gate using ascorbic acid (AA) as the superior denier. All the logic operations can visually read due to the appearance of distinct color changes.
KeywordsMoO3-x nanomaterials Colorimetry Visualization Molecular computing Plasmonic switch One-vote deny Ascorbic acid Chromogenic substrate Oxidants Dual output logic gate
The support of this research by the National Natural Science Foundation of China (Grant No. 21705134), Longshan academic talent research supporting program of SWUST (Grant No. 18LZX204 and 17LZX449), and Postgraduate Innovation Fund Project by Southwest University of Science and Technology (Grant No. 18ycx072) are gratefully acknowledged.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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