Redox Cycling in Nanoscale-Recessed Ring-Disk Electrode Arrays for Enhanced Electrochemical Sensitivity

ACS Nano ◽  
2013 ◽  
Vol 7 (6) ◽  
pp. 5483-5490 ◽  
Author(s):  
Chaoxiong Ma ◽  
Nicholas M. Contento ◽  
Larry R. Gibson ◽  
Paul W. Bohn
Keyword(s):  
Redox Cycling ◽  
Disk Electrode ◽  
Electrode Arrays

Electrochemistry at single molecule occupancy in nanopore-confined recessed ring-disk electrode arrays

2016 ◽  
Vol 193 ◽  
pp. 51-64 ◽  
Author(s):  
Kaiyu Fu ◽  
Donghoon Han ◽  
Chaoxiong Ma ◽  
Paul W. Bohn
Keyword(s):  
Single Molecule ◽  
Pore Diameter ◽  
High Signal ◽  
Current Response ◽  
Disk Electrode ◽  
Operating Characteristics ◽  
Electrode Arrays ◽  
Average Pore ◽  
Redox Species ◽  
Metal Insulator Metal

Electrochemical reactions at nanoscale structures possess unique characteristics, e.g. fast mass transport, high signal-to-noise ratio at low concentration, and insignificant ohmic losses even at low electrolyte concentrations. These properties motivate the fabrication of high density, laterally ordered arrays of nanopores, embedding vertically stacked metal–insulator–metal electrode structures and exhibiting precisely controlled pore size and interpore spacing for use in redox cycling. These nanoscale recessed ring-disk electrode (RRDE) arrays exhibit current amplification factors, AFRC, as large as 55-fold with Ru(NH3)62/3+, indicative of capture efficiencies at the top and bottom electrodes, Φt,b, exceeding 99%. Finite element simulations performed to investigate the concentration distribution of redox species and to assess operating characteristics are in excellent agreement with experiment. AFRC increases as the pore diameter, at constant pore spacing, increases in the range 200–500 nm and as the pore spacing, at constant pore diameter, decreases in the range 1000–460 nm. Optimized nanoscale RRDE arrays exhibit a linear current response with concentration ranging from 0.1 μM to 10 mM and a small capacitive current with scan rate up to 100 V s−1. At the lowest concentrations, the average pore occupancy is 〈n〉 ∼ 0.13 molecule establishing productive electrochemical signals at occupancies at and below the single molecule level in these nanoscale RRDE arrays.

Redox Cycling Behavior of Individual and Binary Mixtures of Catecholamines at Gold Microband Electrode Arrays

2015 ◽  
Vol 87 (4) ◽  
pp. 2029-2032 ◽  
Author(s):  
Mengjia Hu ◽  
Ingrid Fritsch
Keyword(s):  
Binary Mixtures ◽  
Redox Cycling ◽  
Electrode Arrays ◽  
Cycling Behavior

Ion selective redox cycling in zero-dimensional nanopore electrode arrays at low ionic strength

Nanoscale ◽  
2017 ◽  
Vol 9 (16) ◽  
pp. 5164-5171 ◽  
Author(s):  
Kaiyu Fu ◽  
Donghoon Han ◽  
Chaoxiong Ma ◽  
Paul W. Bohn
Keyword(s):  
Ionic Strength ◽  
Redox Cycling ◽  
Electrode Arrays ◽  
Low Ionic Strength ◽  
Nanopore Electrode

scholarly journals Asymmetric Nafion-Coated Nanopore Electrode Arrays as Redox-Cycling-Based Electrochemical Diodes

ACS Nano ◽  
2018 ◽  
Vol 12 (9) ◽  
pp. 9177-9185 ◽  
Author(s):  
Kaiyu Fu ◽  
Donghoon Han ◽  
Seung-Ryong Kwon ◽  
Paul W. Bohn
Keyword(s):  
Redox Cycling ◽  
Electrode Arrays ◽  
Nanopore Electrode

scholarly journals Ion Accumulation and Migration Effects on Redox Cycling in Nanopore Electrode Arrays at Low Ionic Strength

ACS Nano ◽  
2016 ◽  
Vol 10 (3) ◽  
pp. 3658-3664 ◽  
Author(s):  
Chaoxiong Ma ◽  
Wei Xu ◽  
William R. A. Wichert ◽  
Paul W. Bohn
Keyword(s):  
Ionic Strength ◽  
Redox Cycling ◽  
Ion Accumulation ◽  
Electrode Arrays ◽  
And Migration ◽  
Low Ionic Strength ◽  
Nanopore Electrode

Redox Cycling at Interdigitated Nanowire Electrode Arrays: Enhanced Electrochemical Sensing

2018 ◽  
Author(s):  
I. Seymour ◽  
P. Lovera ◽  
A. Wahl ◽  
J.F. Rohan ◽  
A. O Riordan
Keyword(s):  
Redox Cycling ◽  
Electrochemical Sensing ◽  
Electrode Arrays

scholarly journals Redox cycling-based detection of phenazine metabolites secreted from Pseudomonas aeruginosa in nanopore electrode arrays

The Analyst ◽  
2021 ◽  
Author(s):  
Hyein Do ◽  
Seung-Ryong Kwon ◽  
Seol Baek ◽  
Chinedu S. Madukoma ◽  
Marina K. Smiley ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Redox Cycling ◽  
Electrode Arrays ◽  
Nanopore Electrode

Phenazine metabolites produced by Pseudomonas aeruginosa are selectively transported into nanopore electrode arrays for enhanced detection by redox cycling reactions at the dual electrodes while the larger bacteria are excluded.

Redox Cycling in Nanopore-Confined Recessed Dual-Ring Electrode Arrays

2016 ◽  
Vol 120 (37) ◽  
pp. 20634-20641 ◽  
Author(s):  
Donghoon Han ◽  
Lawrence P. Zaino ◽  
Kaiyu Fu ◽  
Paul W. Bohn
Keyword(s):  
Redox Cycling ◽  
Ring Electrode ◽  
Electrode Arrays ◽  
Dual Ring
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