NDLI: Self-induced redox cycling coupled luminescence on nanopore recessed disk-multiscale bipolar electrodes

Content Provider	Royal Society of Chemistry (RSC)
Author	III, Lawrence P. Zaino Bohn, Paul W. Ma, Chaoxiong
Copyright Year	2015
Abstract	We present a new configuration for coupling fluorescence microscopy and voltammetry using self-induced redox cycling for ultrasensitive electrochemical measurements. An array of nanopores, each supporting a recessed disk electrode separated by 100 nm in depth from a planar multiscale bipolar top electrode, was fabricated using multilayer deposition, nanosphere lithography, and reactive-ion etching. Self-induced redox cycling was induced on the disk electrode producing ∼30× current amplification, which was independently confirmed by measuring induced electrogenerated chemiluminescence from Ru(bpy)32/3+/tri-n-propylamine on the floating bipolar electrode. In this design, redox cycling occurs between the recessed disk and the top planar portion of a macroscopic thin film bipolar electrode in each nanopore. Electron transfer also occurs on a remote (mm-distance) portion of the planar bipolar electrode to maintain electroneutrality. This couples the electrochemical reactions of the target redox pair in the nanopore array with a reporter, such as a potential-switchable fluorescent indicator, in the cell at the distal end of the bipolar electrode. Oxidation or reduction of reversible analytes on the disk electrodes were accompanied by reduction or oxidation, respectively, on the nanopore portion of the bipolar electrode and then monitored by the accompanying oxidation of dihydroresorufin or reduction of resorufin at the remote end of the bipolar electrode, respectively. In both cases, changes in fluorescence intensity were triggered by the reaction of the target couple on the disk electrode, while recovery was largely governed by diffusion of the fluorescent indicator. Reduction of 1 nM of Ru(NH3)63+ on the nanoelectrode array was detected by monitoring the fluorescence intensity of resorufin, demonstrating high sensitivity fluorescence-mediated electrochemical sensing coupled to self-induced redox cycling.
Starting Page	3173
Ending Page	3179
Page Count	7
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	6
Issue Number	5
Journal	Chemical Science
DOI	10.1039/c5sc00433k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Reactive-ion etching Electrode Redox Fluorescence Voltammetry Bipolar junction transistor Chemiluminescence Ammonia Reporter gene Microscopy Electrochemistry Nanopore Diffusion Nanosphere lithography Nanoelectrochemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry

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