TY - JOUR A1 - Murib, Mohammed S. A1 - Tran, Anh Quang A1 - Ceuninck, Ward de A1 - Schöning, Michael Josef A1 - Nesladek, Milos A1 - Serpengüzel, Ali A1 - Wagner, Patrick T1 - Analysis of an optical biosensor based on elastic light scattering from diamond-, glass-, and sapphire microspheres JF - Physica Status Solidi A N2 - Deoxyribonucleic acid (DNA) and protein recognition are now standard tools in biology. In addition, the special optical properties of microsphere resonators expressed by the high quality factor (Q-factor) of whispering gallery modes (WGMs) or morphology dependent resonances (MDRs) have attracted the attention of the biophotonic community. Microsphere-based biosensors are considered as powerful candidates to achieve label-free recognition of single molecules due to the high sensitivity of their WGMs. When the microsphere surface is modified with biomolecules, the effective refractive index and the effective size of the microsphere change resulting in a resonant wavelength shift. The transverse electric (TE) and the transverse magnetic (TM) elastic light scattering intensity of electromagnetic waves at 600 and 1400 nm are numerically calculated for DNA and unspecific binding of proteins to the microsphere surface. The effect of changing the optical properties was studied for diamond (refractive index 2.34), glass (refractive index 1.50), and sapphire (refractive index 1.75) microspheres with a 50 µm radius. The mode spacing, the linewidth of WGMs, and the shift of resonant wavelength due to the change in radius and refractive index, were analyzed by numerical simulations. Preliminary results of unspecific binding of biomolecules are presented. The calculated shift in WGMs can be used for biomolecules detection. Y1 - 2012 U6 - https://doi.org/10.1002/pssa.201100795 SN - 1862-6319 N1 - Special Issue: "Fundamentals and Applications of Diamond" VL - 209 IS - 9 SP - 1804 EP - 1810 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Bohrn, Ulrich A1 - Stütz, Evamaria A1 - Fleischer, Maximilian A1 - Schöning, Michael Josef A1 - Wagner, Patrick T1 - Using a cell-based gas biosensor for investigation of adverse effects of acetone vapors in vitro JF - Biosensors and Bioelectronics. 40 (2013), H. 1 Y1 - 2013 SN - 0956-5663 SP - 393 EP - 400 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Hennemann, Jörg A1 - Kohl, Claus-Dieter A1 - Reisert, Steffen A1 - Kirchner, Patrick A1 - Schöning, Michael Josef T1 - Copper oxide nanofibres for detection of hydrogen peroxide vapour at high concentrations JF - physica status solidi (a) N2 - We present a sensor concept based on copper(II)oxide (CuO) nanofibres for the detection of hydrogen peroxide (H2O2) vapour in the percent per volume (% v/v) range. The fibres were produced by using the electrospinning technique. To avoid water condensation in the pores, the fibres were initially modified by an exposure to H2S to get an enclosed surface. By a thermal treatment at 350 °C the fibres were oxidised back to CuO. Thereby, the visible pores disappear which was verified by SEM analysis. The fibres show a decrease of resistance with increasing H2O2 concentration which is due to the fact that hydrogen peroxide is an oxidising gas and CuO a p-type semiconductor. The sensor shows a change of resistance within the minute range to the exposure until the maximum concentration of 6.9% v/v H2O2. At operating temperatures below 450 °C the corresponding sensor response to a concentration of 4.1% v/v increases. The sensor shows a good reproducibility of the signal at different measurements. CuO seems to be a suitable candidate for the detection of H2O2 vapour at high concentrations. Resistance behaviour of the sensor under exposure to H2O2 vapours between 2.3 and 6.9% v/v at an operating temperature of 450 °C. Y1 - 2013 U6 - https://doi.org/10.1002/pssa.201200775 SN - 1862-6319 VL - 210 IS - 5 SP - 859 EP - 863 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Reisert, Steffen A1 - Schneider, Benno A1 - Geissler, Hanno A1 - Gompel, Matthias van A1 - Wagner, Patrick A1 - Schöning, Michael Josef T1 - Multi-sensor chip for the investigation of different types of metal oxides for the detection of H2O2 in the ppm range JF - physica status solidi (a) N2 - In this work, a multi-sensor chip for the investigation of the sensing properties of different types of metal oxides towards hydrogen peroxide in the ppm range is presented. The fabrication process and physical characterization of the multi-sensor chip are described. Pure SnO2 and WO3 as well as Pd- and Pt-doped SnO2 films are characterized in terms of their sensitivity to H2O2. The sensing films have been prepared by drop-coating of water-dispensed nano-powders. A physical characterization, including scanning electron microscopy and X-ray diffraction analysis of the deposited metal-oxide films, was done. From the measurements in hydrogen peroxide atmosphere, it could be shown, that all of the tested metal oxide films are suitable for the detection of H2O2 in the ppm range. The highest sensitivity and reproducibility was achieved using Pt-doped SnO2. Calibration plot of a SnO2, WO3, Pt-, and Pd-doped SnO2 gas sensor for H2O2 concentrations in the ppm range. Y1 - 2013 SN - 1862-6319 VL - 210 IS - 5 SP - 898 EP - 904 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Kirchner, Patrick A1 - Oberländer, Jan A1 - Suso, Henri-Pierre A1 - Rysstad, Gunnar A1 - Keusgen, Michael A1 - Schöning, Michael Josef T1 - Towards a wireless sensor system for real-time H2O2 monitoring in aseptic food processes JF - Physica status solidi (a) N2 - A wireless sensor system based on the industrial ZigBee standard for low-rate wireless networking was developed that enables real-time monitoring of gaseous H2O2 during the package sterilization in aseptic food processes. The sensor system consists of a remote unit connected to a calorimetric gas sensor, which was already established in former works, and an external base unit connected to a laptop computer. The remote unit was built up by an XBee radio frequency (RF) module for data communication and a programmable system-on-chip controller to read out the sensor signal and process the sensor data, whereas the base unit is a second XBee RF module. For the rapid H2O2 detection on various locations inside the package that has to be sterilized, a novel read-out strategy of the calorimetric gas sensor was established, wherein the sensor response is measured within the short sterilization time and correlated with the present H2O2 concentration. In an exemplary measurement application in an aseptic filling machinery, the suitability of the new, wireless sensor system was demonstrated, wherein the influence of the gas velocity on the H2O2 distribution inside a package was determined and verified with microbiological tests. KW - calorimetric gas sensor;hydrogen peroxide;wireless sensor system Y1 - 2013 U6 - https://doi.org/10.1002/pssa.201200920 SN - 1862-6319 VL - 210 IS - 5 SP - 877 EP - 883 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Miyamoto, Ko-ichiro A1 - Ichimura, Hiroki A1 - Wagner, Torsten A1 - Schöning, Michael Josef A1 - Yoshinobu, Tatsuo T1 - Chemical imaging of the concentration profile of ion diffusion in a microfluidic channel JF - Sensors and actuators. B: Chemical N2 - The chemical imaging sensor is a device to visualize the spatial distribution of chemical species based on the principle of LAPS (light-addressable potentiometric sensor), which is a field-effect chemical sensor based on semiconductor. In this study, the chemical imaging sensor has been applied to investigate the ion profile of laminar flows in a microfluidic channel. The chemical images (pH maps) were collected in a Y-shaped microfluidic channel while injecting HCl and NaCl solutions into two branches. From the chemical images, it was clearly observed that the injected solutions formed laminar flows in the channel. In addition, ion diffusion across the laminar flows was observed, and the diffusion coefficient could be derived by fitting the pH profiles to the Fick's equation. Y1 - 2013 U6 - https://doi.org/10.1016/j.snb.2013.04.057 SN - 1873-3077 (E-Journal); 0925-4005 (Print) N1 - Part of special issue "Selected Papers from the 26th European Conference on Solid-State Transducers" VL - 189 SP - 240 EP - 245 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Bohrn, Ulrich A1 - Mucha, Andreas A1 - Werner, Frederik A1 - Trattner, Barbara A1 - Bäcker, Matthias A1 - Krumbe, Christoph A1 - Schienle, Meinrad A1 - Stütz, Evamaria A1 - Schmitt-Landsiedel, Doris A1 - Fleischer, Maximilian A1 - Wagner, Patrick A1 - Schöning, Michael Josef T1 - A critical comparison of cell-based sensor systems for the detection of Cr (VI) in aquatic environment JF - Sensors and actuators. B: Chemical Y1 - 2013 SN - 1873-3077 (E-Journal); 0925-4005 (Print) VL - Vol. 182 SP - 58 EP - 65 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Vitusevich, S. A. A1 - Förster, Arnold A1 - Lüth, H. A1 - Belyaev, A. E. A1 - Danylyuk, S. V. A1 - Konakova, R. V. A1 - Sheka, D. I. T1 - Resonant spectroscopy of electric-field-induced superlattices JF - Journal of Applied Physics. 90 (2001), H. 6 Y1 - 2001 SN - 1089-7550 U6 - https://doi.org/10.1063/1.1392956 SP - 2857 EP - 2861 ER - TY - JOUR A1 - Stock, J. A1 - Malindretos, J. A1 - Indlekofer, K.M. A1 - Pöttgens, Michael A1 - Förster, Arnold A1 - Lüth, Hans T1 - A Vertical Resonant Tunneling Transistor for Application in Digital Logic Circuits JF - IEEE Transactions on Electron Devices (T-ED). 48 (2001), H. 6 Y1 - 2001 SN - 0018-9383 SP - 1028 EP - 1032 ER - TY - JOUR A1 - Hodel, U. A1 - Orzati, A. A1 - Marso, M. A1 - Homann, O. A1 - Fox, A. A1 - Hart, A. v. d. A1 - Förster, Arnold A1 - Kordos, P. A1 - Lüth, H. T1 - A novel InAlAs/InGaAs layer structure for monolithically integrated photoreceiver JF - Conference Proceedings: 2000 International Conference on Indium Phosphide and related materials Y1 - 2000 SN - 0-7803-6320-5 N1 - International Conference on Indium Phosphide and Related Materials <12, 2000, Williamsburg, Va.> SP - 466 EP - 469 PB - IEEE Service Center CY - Piscataway, NJ ER - TY - JOUR A1 - Hoskens, R.C.P. A1 - Roer, T.G. van de A1 - Tolstikhin, V.I. A1 - Förster, Arnold T1 - Hot electron injection laser: vertically integrated transistor-laser structure for high-speed, low-chirp direct modulation JF - LEOS 2000 : 2000 IEEE annual meeting conference proceedings; 13th annual meeting; IEEE Lasers and Electro-Optics Society 2000 annual meeting; 13-16 November 2000, The Westin Rio Mar Beach, Rio Grande, Puerto Rico. Vol. 2 Y1 - 2000 SN - 0-7803-5947-X N1 - 2000 IEEE LEOS annual meeting SP - 444 EP - 445 PB - IEEE Service Center CY - Piscataway, NJ ER - TY - JOUR A1 - Hoskens, R. C. P. A1 - Tolstikhin, V.I. A1 - Förster, Arnold A1 - Roer, T.G. van de T1 - Vertically integrated transistor-laser structure, take 2 JF - WOCSDICE 2000, 24th Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe : May 29 - June 02, 2000, Aegean Sea, Greece. Y1 - 2000 SN - 0970311109 N1 - WOCSDICE ; (24, 2000) Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe ; (24 : ; 2000.05.29-06.02) PB - Univ. of Michigan CY - Ann Arbor, Mich. ER - TY - JOUR A1 - Darmo, J. A1 - Schäffer, F. A1 - Förster, Arnold A1 - Kordos, P. T1 - Beryllium doped low-temperature-grown MBE GaAs: material for photomixing in the THz frequency range JF - ASDAM 2000 : conference proceedings / edited by Jozef Osvald ... [et al.] Y1 - 2000 SN - 0780359399 N1 - International Conference on Advanced Semiconductor Devices and Microsystems ; (3rd : ; 2000 : ; Smolenice, Slovakia) SP - 147 EP - 150 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Schmidt, R. A1 - Tonnesmann, A. A1 - Förster, Arnold A1 - Grimm, M. A1 - Kordos, P. A1 - Lüth, H. T1 - Metamorphic InAlAs/InGaAs HEMT's on GaAs substrates using an InP buffer layer JF - 8th IEEE International Symposium on High Performance Electron Devices for Microwave and Optoelectronic Applications : EDMO 2000 ; [13 - 14 November 2000, University of Glasgow] / organised by Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow Scotland. MTT/ED/AP/LEO Societies Joint Chapter, United Kingdom and Republic of Ireland Section. With technical co-sponsorship from IEEE Electron Device Society Y1 - 2000 SN - 0-7803-6550-X N1 - EDMO <8, 2000, Glasgow> ; University / Department of Electronics and Electrical Engineering ; IEEE catalog number 00TH8534 SP - 95 EP - 98 PB - IEEE Operations Center CY - Piscataway, NJ ER - TY - JOUR A1 - Vitusevich, S. A. A1 - Förster, Arnold A1 - Reetz, W. A1 - Lüth, H. A1 - Belyaev, A. E. A1 - Danylyuk, S. V. T1 - Fine structure of photoresponse spectra in a double-barrier resonant tunnelling diode JF - Nanotechnology. 11 (2000), H. 4 Y1 - 2000 SN - 1361-6528 SP - 305 EP - 308 ER - TY - JOUR A1 - Förster, Arnold T1 - Resonant tunneling diodes operating as modern quantum transport devices JF - Proceedings of the Tenth International Workshop on the Physics of Semiconductor Devices : (December 14 - 18, 1999) / ed.: Vikram Kumar ... - Vol. 2 Y1 - 2000 SN - 81-7023-998-2 N1 - International Workshop on the Physics of Semiconductor Devices <10, 1999, Delhi> SP - 966 EP - 966 PB - Allied Publ. CY - New Delhi [u.a.] ER - TY - JOUR A1 - Turek, Monika A1 - Ketterer, Lothar A1 - Claßen, Melanie A1 - Berndt, Heinz A1 - Elbers, Gereon A1 - Krüger, Peter A1 - Keusgen, Michael A1 - Schöning, Michael Josef T1 - Development and Electrochemical Investigations of an EIS-(Electrolyte-Insulator-Semiconductor) based Biosensor for Cyanide Detection JF - Sensors Y1 - 2007 SN - 1424-8220 VL - 7 IS - 8 SP - 1415 EP - 1426 ER - TY - JOUR A1 - Wagner, Torsten A1 - Molina, Roberto A1 - Yoshinobu, Tatsuo A1 - Kloock, Joachim P. A1 - Biselli, Manfred A1 - Canzoneri, Michele A1 - Schnitzler, Thomas A1 - Schöning, Michael Josef T1 - Handheld multi-channel LAPS device as a transducer platform for possible biological and chemical multi-sensor applications JF - Electrochimica Acta. 53 (2007), H. 2 Y1 - 2007 SN - 0013-4686 SP - 305 EP - 311 ER - TY - JOUR A1 - Schöning, Michael Josef A1 - Kirchner, Patrick A1 - Ng, Yue Ann A1 - Spelthahn, Heiko A1 - Schneider, Andreas A1 - Henkel, Hartmut A1 - Friedrich, Peter A1 - Kolstad, Jens A1 - Berger, Jörg A1 - Keusgen, Michael T1 - Gas sensor investigation based on a catalytically activated thin-film thermopile for H2O2 detection JF - Physica Status Solidi (A). 207 (2010), H. 4 Y1 - 2010 SN - 1862-6300 N1 - Special Issue: Engineering of Functional Interfaces EnFI 2009 SP - 787 EP - 792 ER - TY - JOUR A1 - Turek, Monik A1 - Heiden, Wolfgang A1 - Guo, Sharon A1 - Riesen, Alfred A1 - Schubert, Jürgen A1 - Zander, Willi A1 - Krüger, Peter A1 - Keusgen, Michael A1 - Schöning, Michael Josef T1 - Simultaneous detection of cyanide and heavy metals for environmental analysis by means of µISEs JF - Physica Status Solidi (A). 207 (2010), H. 4 Y1 - 2010 SN - 1862-6300 N1 - Special Issue: Engineering of Functional Interfaces EnFI 2009 SP - 817 EP - 823 ER -