Four-in-One: Advanced Copper Nanocomposites for Multianalyte Assays and Multicoding Logic Gates

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Non-noble metal nanomaterials face challenges in stability, functionality, and surface plasmon resonance for nanoprobes.
• Developing robust and versatile nanomaterials is crucial for advanced sensing applications.

Purpose of the Study:

• To synthesize and characterize novel ultrasmall copper nanoparticles (NCC@MSA-Cu SPs) for enhanced diagnostic capabilities.
• To demonstrate the application of these nanoparticles in a multi-analyte sensing platform for point-of-care tests (POCTs).

Main Methods:

• Facile one-step synthesis and self-assembly of ultrasmall copper nanoparticles using copper ion, mercaptosuccinic acid, and nanocrystalline cellulose.
• Development of a multi-analyte sensing strategy integrating diverse chemical reaction mechanisms for selective metal ion recognition (Hg2+, Pb2+, Ag+, Zr4+).

Main Results:

• Ultrasmall copper nanoparticles (NCC@MSA-Cu SPs) exhibited advanced multifunctionality and stability.
• The developed platform successfully detected four different metal ions with distinct readout signals, avoiding cross-interference.
• Visual multicoding logic gates (OR, NOR, AND, INHIBIT) were constructed based on the optical responses of the Cu SPs.

Conclusions:

• NCC@MSA-Cu SPs offer a promising, stable, and multifunctional alternative to non-noble metal nanomaterials for sensing.
• The multi-signal mode-guided sensing strategy effectively enhances accuracy and reliability in complex sample analysis.
• This work paves the way for sophisticated optical logic operations and advanced POCTs.