TY  - JOUR
A1  - Werner, Frederik
A1  - Wagner, Torsten
A1  - Yoshinobu, Tatsuo
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Frequency behaviour of light-addressable potentiometric sensors
JF  - Physica Status Solidi (A)
N2  - Light-addressable potentiometric sensors (LAPS) are semiconductor-based potentiometric sensors, with the advantage to detect the concentration of a chemical species in a liquid solution above the sensor surface in a spatially resolved manner. The addressing is achieved by a modulated and focused light source illuminating the semiconductor and generating a concentration-depending photocurrent. This work introduces a LAPS set-up that is able to monitor the electrical impedance in addition to the photocurrent. The impedance spectra of a LAPS structure, with and without illumination, as well as the frequency behaviour of the LAPS measurement are investigated. The measurements are supported by electrical equivalent circuits to explain the impedance and the LAPS-frequency behaviour. The work investigates the influence of different parameters on the frequency behaviour of the LAPS. Furthermore, the phase shift of the photocurrent, the influence of the surface potential as well as the changes of the sensor impedance will be discussed.
Y1  - 2013
U6  - https://doi.org/10.1002/pssa.201200929
SN  - 1521-396X ; 0031-8965
VL  - 210
IS  - 5
SP  - 884
EP  - 891
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Schiffels, Johannes
A1  - Pinkenburg, Olaf
A1  - Schelden, Maximilian
A1  - Aboulnaga, El-Hussiny A. A.
A1  - Baumann, Marcus
A1  - Selmer, Thorsten
T1  - An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from cupriavidus necator in Escherichia coli
JF  - PLOS one. 2013
Y1  - 2013
U6  - https://doi.org/10.1371/journal.pone.0068812
SN  - 1932-6203
PB  - Public Library of Science
CY  - San Francisco, California
ER  - 
TY  - JOUR
A1  - Müller, Karsten
A1  - Billmaier, Karl
A1  - Müller, Ernst A.
T1  - Abwasserwärmenutzung
JF  - Wasserwirtschaft, Wassertechnik : wwt. 2013, H. 5
Y1  - 2013
SN  - 1438-5716
SP  - 24
EP  - 26
PB  - Deutscher Fachverlag
CY  - Frankfurt am Main
ER  - 
TY  - JOUR
A1  - Timme, Michael
T1  - Begrenzung von Mietbürgschaften gem. § 551 Abs. 4 BGB?
JF  - Monatsschrift für deutsches Recht : MdR
Y1  - 2013
SN  - 0340-1812 (Print) ; 2194-4202 (E-Journal)
VL  - 16
SP  - 948
EP  - 949
PB  - Verlag Dr. Otto Schmidt
CY  - Köln
ER  - 
TY  - JOUR
A1  - Timme, Michael
T1  - Begrenzung von Mietbürgschaften gem. § 551 Abs. 4 BGB?
JF  - Der Miet-Rechts-Berater : MietRB
Y1  - 2013
SN  - 1612-040X
IS  - 8
SP  - 248
EP  - 249
PB  - Verlag Dr. Otto Schmidt
CY  - Köln
ER  - 
TY  - JOUR
A1  - Schneider, Bettina
A1  - Schneider, Wilhelm
T1  - Rechnungslegung nach IFRS im Vergleich zum HGB
JF  - Das Wirtschaftsstudium : wisu ; Zeitschrift für Ausbildung, Examen, Berufseinstieg und Fortbildung
Y1  - 2013
SN  - 0340-3084
SP  - 536
EP  - 541
PB  - Lange
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Müller, Thomas
T1  - Aufweichung der Gewaltenteilung und Demokratieverlust - Achtung vor dem Parlament. Darstellung einer Rechtschöpfung der Exekutive im Umfeld des §15 AStG
JF  - Der Betrieb
Y1  - 2013
SN  - 0005-9935
IS  - 11
SP  - 542
EP  - 548
PB  - Fachmedien Otto Schmidt
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Itabashi, Akinori
A1  - Kosaka, Naoki
A1  - Miyamoto, Ko-ichiro
A1  - Wagner, Torsten
A1  - Schöning, Michael Josef
T1  - High-speed chemical imaging system based on front-side-illuminated LAPS
JF  - Sensors and actuators B: Chemical
N2  - The chemical imaging sensor is a semiconductor-based chemical sensor that can visualize the spatial distribution of specific ions on the sensing surface. The conventional chemical imaging system based on the light-addressable potentiometric sensor (LAPS), however, required a long time to obtain a chemical image, due to the slow mechanical scan of a single light beam. For high-speed imaging, a plurality of light beams modulated at different frequencies can be employed to measure the ion concentrations simultaneously at different locations on the sensor plate by frequency division multiplex (FDM). However, the conventional measurement geometry of back-side illumination limited the bandwidth of the modulation frequency required for FDM measurement, because of the low-pass filtering characteristics of carrier diffusion in the Si substrate. In this study, a high-speed chemical imaging system based on front-side-illuminated LAPS was developed, which achieved high-speed spatiotemporal recording of pH change at a rate of 70 frames per second.
Y1  - 2013
U6  - https://doi.org/10.1016/j.snb.2013.03.016
SN  - 1873-3077
VL  - 182
SP  - 315
EP  - 321
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Frings, Michael
T1  - Änderungen zur Haftung und Vergütung im Vereins- und Stiftungsrecht
JF  - Neue Wirtschaftsbriefe NWB Steuer- und Wirtschaftsrecht
Y1  - 2013
SN  - 0028-3460
N1  - Fundstelle SAAAE-30695
SP  - 693
EP  - 699
PB  - NWB Verlag
CY  - Herne
ER  - 
TY  - JOUR
A1  - Frings, Michael
T1  - Begrenzung von vertraglichen Höchstfristen für Zahlungen und Abnahmen
JF  - Neue Wirtschaftsbriefe NWB Steuer- und Wirtschaftsrecht
Y1  - 2013
SN  - 0028-3460
N1  - Fundstelle WAAAE-25903
SP  - 49
EP  - 56
PB  - NWB Verlag
CY  - Herne
ER  -