Enhanced Bipolar Electrochemistry at Solid-State Micropores:
Demonstration by Wireless
Electrochemiluminescence Imaging
Posted on 2019-06-26 - 14:47
Bipolar
electrochemistry (BPE) is a powerful method based on the
wireless polarization of a conductive object that induces the asymmetric
electroactivity at its two extremities. A key physical limitation
of BPE is the size of the conductive object because the shorter the
object, the larger is the potential necessary for sufficient polarization.
Micrometric and nanometric objects are thus extremely difficult to
address by BPE due to the very high potentials required, in the order
of tens of kV or more. Herein, the synergetic actions of BPE and of
planar micropores integrated in a microfluidic device lead to the
spatial confinement of the potential drop at the level of the solid-state
micropore, and thus to a locally enhanced polarization of a bipolar
electrode. Electrochemiluminescence (ECL) is emitted in half of the
electroactive micropore and reveals the asymmetric polarization in
this spatial restriction. Micrometric deoxidized silicon electrodes
located in the micropore are polarized at a very low potential (7
V), which is more than 2 orders of magnitude lower compared to the
classic bipolar configurations. This behavior is intrinsically associated
with the unique properties of the micropores, where the sharp potential
drop is focused. The presented approach offers exciting perspectives
for BPE of micro/nano-objects, such as dynamic BPE with objects passing
through the pores or wireless ECL-emitting micropores.
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Ismail, Abdulghani; Voci, Silvia; Pham, Pascale; Leroy, Loïc; Maziz, Ali; Descamps, Lucie; et al. (2019). Enhanced Bipolar Electrochemistry at Solid-State Micropores:
Demonstration by Wireless
Electrochemiluminescence Imaging. ACS Publications. Collection. https://doi.org/10.1021/acs.analchem.9b00559
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AUTHORS (13)
AI
Abdulghani Ismail
SV
Silvia Voci
PP
Pascale Pham
LL
Loïc Leroy
AM
Ali Maziz
LD
Lucie Descamps
AK
Alexander Kuhn
PM
Pascal Mailley
TL
Thierry Livache
AB
Arnaud Buhot
TL
Thierry Leichlé
AB
Aurélie Bouchet-Spinelli
NS
Neso Sojic