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@ARTICLE{Poghossian:150600,
author = {Poghossian, A. and Cherstvy, A. G. and Schöning, M. J.},
title = {{E}lectrical monitoring of polyelectrolyte multilayer
formation by means of capacitive field-effect devices.},
journal = {Analytical and bioanalytical chemistry},
volume = {405},
number = {20},
issn = {1618-2650},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2014-00649},
pages = {6425 - 6436},
year = {2013},
abstract = {The semiconductor field-effect platform represents a
powerful tool for detecting the adsorption and binding of
charged macromolecules with direct electrical readout. In
this work, a capacitive
electrolyte–insulator–semiconductor (EIS) field-effect
sensor consisting of an Al-p-Si-SiO2 structure has been
applied for real-time in situ electrical monitoring of the
layer-by-layer formation of polyelectrolyte (PE) multilayers
(PEM). The PEMs were deposited directly onto the SiO2
surface without any precursor layer or drying procedures.
Anionic poly(sodium 4-styrene sulfonate) and cationic weak
polyelectrolyte poly(allylamine hydrochloride) have been
chosen as a model system. The effect of the ionic strength
of the solution, polyelectrolyte concentration, number and
polarity of the PE layers on the characteristics of the
PEM-modified EIS sensors have been studied by means of
capacitance–voltage and constant-capacitance methods. In
addition, the thickness, surface morphology, roughness and
wettabilityof the PE mono- and multilayers have been
characterised by ellipsometry, atomic force microscopy and
water contact-angle methods, respectively. To explain
potential oscillations on the gate surface and signal
behaviour of the capacitive field-effect EIS sensor modified
with a PEM, a simplified electrostatic model that takes into
account the reduced electrostatic screening of PE charges by
mobile ions within the PEM has been proposed and discussed.},
cin = {PGI-8 / JARA-FIT / ICS-8},
ddc = {540},
cid = {I:(DE-Juel1)PGI-8-20110106 / $I:(DE-82)080009_20140620$ /
I:(DE-Juel1)ICS-8-20110106},
pnm = {423 - Sensorics and bioinspired systems (POF2-423) / 453 -
Physics of the Cell (POF2-453)},
pid = {G:(DE-HGF)POF2-423 / G:(DE-HGF)POF2-453},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000321911800005},
doi = {10.1007/s00216-013-6951-9},
url = {https://juser.fz-juelich.de/record/150600},
}