TY - JOUR
T1 - Nanocavity crossbar arrays for parallel electrochemical sensing on a chip
AU - Kätelhön, Enno
AU - Mayer, Dirk
AU - Banzet, Marko
AU - Offenhäusser, Andreas
AU - Wolfrum, Bernhard
PY - 2014
Y1 - 2014
N2 - We introduce a novel device for the mapping of redox-active compounds at high spatial resolution based on a crossbar electrode architecture. The sensor array is formed by two sets of 16 parallel band electrodes that are arranged perpendicular to each other on the wafer surface. At each intersection, the crossing bars are separated by a ca. 65 nm high nanocavity, which is stabilized by the surrounding passivation layer. During operation, perpendicular bar electrodes are biased to potentials above and below the redox potential of species under investigation, thus, enabling repeated subsequent reactions at the two electrodes. By this means, a redox cycling current is formed across the gap that can be measured externally. As the nanocavity devices feature a very high current amplification in redox cycling mode, individual sensing spots can be addressed in parallel, enabling high-throughput electrochemical imaging. This paper introduces the design of the device, discusses the fabrication process and demonstrates its capabilities in sequential and parallel data acquisition mode by using a hexacyanoferrate probe.
AB - We introduce a novel device for the mapping of redox-active compounds at high spatial resolution based on a crossbar electrode architecture. The sensor array is formed by two sets of 16 parallel band electrodes that are arranged perpendicular to each other on the wafer surface. At each intersection, the crossing bars are separated by a ca. 65 nm high nanocavity, which is stabilized by the surrounding passivation layer. During operation, perpendicular bar electrodes are biased to potentials above and below the redox potential of species under investigation, thus, enabling repeated subsequent reactions at the two electrodes. By this means, a redox cycling current is formed across the gap that can be measured externally. As the nanocavity devices feature a very high current amplification in redox cycling mode, individual sensing spots can be addressed in parallel, enabling high-throughput electrochemical imaging. This paper introduces the design of the device, discusses the fabrication process and demonstrates its capabilities in sequential and parallel data acquisition mode by using a hexacyanoferrate probe.
KW - Electrochemical imaging
KW - Nanoelectrochemistry
KW - Redox cycling
UR - http://www.scopus.com/inward/record.url?scp=84905247050&partnerID=8YFLogxK
U2 - 10.3762/bjnano.5.124
DO - 10.3762/bjnano.5.124
M3 - Article
AN - SCOPUS:84905247050
SN - 2190-4286
VL - 5
SP - 1137
EP - 1143
JO - Beilstein Journal of Nanotechnology
JF - Beilstein Journal of Nanotechnology
IS - 1
ER -