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Silver Nanocubes as Electrochemical Labels for Bioassays
Yi Peng1, Charlie Rabin1, Charuksha T Walgama1
1Department of Chemistry, The University of Texas at Austin, 100 E. 24th Street, Stop A1590, Austin, Texas 78712-1224, United States.
ACS Sensors
|January 13, 2021
Summary
Silver nanocubes (AgNCs) improve electrochemical bioassays by enhancing galvanic exchange. This novel approach using AgNCs achieves a significantly lower limit of detection compared to spherical nanoparticles.
Area of Science:
- Electrochemistry
- Nanotechnology
- Biotechnology
Background:
- Electrochemical bioassays are crucial for sensitive detection.
- Silver nanoparticles are widely used as labels.
- Improving the sensitivity of these assays is an ongoing challenge.
Purpose of the Study:
- To investigate the use of silver nanocubes (AgNCs) as electrochemical labels in bioassays.
- To compare the performance of AgNCs with spherical silver nanoparticles (sAgNPs).
- To optimize a metalloimmunoassay for enhanced detection limits.
Main Methods:
- Utilized 40 ± 4 nm silver nanocubes (AgNCs) as electrochemical labels.
- Employed a model metalloimmunoassay combining galvanic exchange (GE) and anodic stripping voltammetry (ASV).
- Analyzed the effect of label shape on GE efficiency and silver collection.
Main Results:
- Silver nanocubes (AgNCs) demonstrated improved galvanic exchange (GE) compared to spherical silver nanoparticles (sAgNPs).
- The gold shell formed on AgNCs during GE was more porous, allowing greater exchange.
- An increase in silver collection efficiency (AgCE%) of up to ~57% was observed with AgNCs.
- An optimized system using AgNCs achieved a limit of detection of 0.1 pM, an order of magnitude lower than sAgNPs.
Conclusions:
- Silver nanocubes (AgNCs) offer superior performance as electrochemical labels in bioassays.
- The enhanced galvanic exchange and silver collection efficiency of AgNCs lead to significantly improved detection limits.
- This study highlights the potential of shape-engineered nanomaterials for advancing sensitive electrochemical detection methods.
