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024 7 _ |a 10.1007/s00216-013-6951-9
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024 7 _ |a 1618-2650
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024 7 _ |a 1432-1130
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037 _ _ |a FZJ-2014-00649
082 _ _ |a 540
100 1 _ |a Poghossian, A.
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245 _ _ |a Electrical monitoring of polyelectrolyte multilayer formation by means of capacitive field-effect devices.
260 _ _ |a Berlin
|c 2013
|b Springer
336 7 _ |a Journal Article
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500 _ _ |3 POF3_Assignment on 2016-02-29
520 _ _ |a 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.
536 _ _ |a 423 - Sensorics and bioinspired systems (POF2-423)
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588 _ _ |a Dataset connected to CrossRef, juser.fz-juelich.de
700 1 _ |a Cherstvy, A. G.
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700 1 _ |a Schöning, M. J.
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773 _ _ |a 10.1007/s00216-013-6951-9
|g Vol. 405, no. 20, p. 6425 - 6436
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|t Analytical and bioanalytical chemistry
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|y 2013
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856 4 _ |u https://juser.fz-juelich.de/record/150600/files/FZJ-2014-00649.pdf
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909 C O |o oai:juser.fz-juelich.de:150600
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910 1 _ |a Forschungszentrum Jülich GmbH
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