Browsing by Subject "gas sensors"

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  • Highly sensitive tellurium based sensors for the detection of nitrogen dioxide 
    TIULEANU, A. (Editura U.T.M., 2006)
    A simple and stable NO2 gas sensor device with rapid response / recovery time and low operating temperature has been developed using polycrystalline tellurium alloys. The effect of thickness of the sample and temperature ...
  • Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications 
    LUPAN, O.; POSTICA, V.; GRÖTTRUP, J.; MISHRA, A. K.; DE LEEUW, N. H.; CARREIRA, J. F. C.; RODRIGUES, J.; BEN SEDRINE, N.; CORREIA, M. R.; MONTEIRO, T.; CRETU, V.; TIGINYANU, I.; SMAZNA, D.; MISHRA, Y. K.; ADELUNG, R. (American Chemical Society, 2017)
    In this work, the exceptionally improved sensing capability of highly porous three-dimensional (3-D) hybrid ceramic networks toward reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are ...
  • Hydrogen detection by individual Pd-modified ZnO nanowire 
    LUPAN, Oleg; PAUPORTÉ, Thierry; POSTICA, Vasile; VIANA, Bruno; ADELUNG, Rainer; CHOW, Lee; TIGINYANU, Ion (Technical University of Moldova, 2017)
    In this work an individual Pd-modified ZnO nanowire (Pd/ZnO NW) was integrated into a nanosensor device using focused ion beam (FIB)/scanning electron microscopy (SEM) system. The Pd/ZnO arrays were synthesized by ...
  • Hydrogen detector based on GaN nanocones 
    POPA, V.; VOLCIUC, O.; SONTEA, V.; TIGINYANU, I. M. (Technical University of Moldova, 2005)
    In this paper, we demonstrate that using GaN nanocone morphology obtained by photo electrochemical etching, it is possible to obtain very stable and easy in manufacturing gas sensors, in particular for hydrogen detection.
  • Hydrogen Gas Sensor Based on Nanograined Pd/α-MoO3 belts 
    CRETU, V.; POSTICA, V.; STOIANOV, D.; TROFIM, V.; SONTEA, V.; LUPAN, O. (Tehnica UTM, 2015)
    In this work, a simple and cost-effective method for nanostructurization of α-MoO3 micro-belts by using an aqueous solution of PdCl2 is reported. Obtained nanograined Pd/α-MoO3 belts, with 70-80 nm average diameters of ...
  • Hydrogen sensing behavior of tellurium thin films studied by A.C. measurements 
    TSIULYANU, Dumitru; MOCREAC, Olga (Engineering Society for Corrosion, Belgrade, Serbia, 2013)
    For the first time it is pointed out that tellurium films exhibit sensitivity to H2 at room temperature along with sensitivity to NO2. The hydrogen gas sensing performance of tellurium thin films was investigated by method ...
  • Impedance Characterization of Gas Sensitive Chalcogenide Films 
    TSIULYANU, Dumitru; CIOBANU, Marina; MOCREAC, Olga (Springer Nature Switzerland, 2018)
    The gas sensing performance of chalcogenide thin films, investigated by the method of impedance spectroscopy is reported and discussed in order to assess their use in future gas sensors operating at room temperature.
  • Impedance Characterization of Gas Sensitive S - Te Based Quaternary Chalcogenides 
    TSIULYANU, D.; CIOBANU, M. (Tehnica UTM, 2015)
    Impedance spectra of quaternary S -Te based alloys were investigated in both dry synthetic air and mixture with nitrogen dioxide in order to assess their use in future gas sensors working at room temperature. To elucidate ...
  • Impedance Spectroscopy of Tellurium Thin Films Sensitive to NO2 
    TSIULYANU, D.; MOCREAC, O. (Springer Nature Switzerland, 2011)
    Impedance spectra of tellurium thin films with interdigital platinum electrodes have been measured in dry synthetic air and gaseous media with nitrogen dioxide. Analyses of Cole-Cole plots allowed to evaluate the characteristic ...
  • Improving gas sensing by CdTe decoration of individual Aerographite microtubes 
    STROBEL, Julian; GHIMPU, Lidia; POSTICA, Vasile; LUPAN, Oleg; ZAPF, Maximilian; SCHÖNHERR, Sven; RÖDER, Robert; RONNING, Carsten; SCHÜTT, Fabian; MISHRA, Yogendra Kumar; TIGINYANU, Ion; ADELUNG, Rainer; MARX, Janik; FIEDLER, Bodo; KIENLE, Lorenz (IOP Publishing Ltd, 2018)
    Novel gas sensors have been realized by decorating clusters of tubular Aerographite with CdTe using magnetron sputtering techniques. Subsequently, individual microtubes were separated and electrically contacted on a SiO2/Si ...
  • Individual CdS-covered aerographite microtubes for room temperature VOC sensing with high selectivity 
    GHIMPU, Lidia; LUPAN, Oleg; POSTICA, Vasile; STROBEL, Julian; KIENLE, Lorenz; TERASA, Maik-Ivo; MINTKEN, Mona; TIGINYANU, Ion; MARX, Janik; FIEDLER, Bodo; ADELUNG, Rainer (ELSEVIER, 2019)
    The synthesis of new nanomaterials with a large surface-to-volume ratio is of high interest for sensing applications, and especially for gas sensors with high performances. In this work, a thin layer of CdS is deposited ...
  • Individual hollow and mesoporous aero-graphitic microtube based devices for gas sensing applications 
    LUPAN, Oleg; POSTICA, Vasile; MARX, Janik; MECKLENBURG, Matthias; MISHRA, Yogendra K.; SCHULTE, Karl; FIEDLER, Bodo; ADELUNG, Rainer (American Institute of Physics, 2017)
    In this work, individual hollow and mesoporous graphitic microtubes were integrated into electronic devices using a FIB/SEM system and were investigated as gas and vapor sensors by applying different bias voltages (in the ...
  • Influence of TiO2 Ultra-Thin Films on Gas Sensing Properties of CuO:Zn 
    ABABII, Nicolai; REIMER, Tim; POSTICA, Vasile; HOPPE, Mathias; CHEMNITZ, Steffen; SONTEA, Victor; BENECKE, Wolfgang; ADELUNG, Rainer; LUPAN, Oleg (Technical University of Moldova, 2017)
    Copper oxide is a p-type metal oxide with remarkable optical, electrical, thermal and sensing properties. The oxidation of Cu2O to CuO can be performed by thermal annealing at relatively low temperatures. The present study ...
  • Localized Synthesis of Iron Oxide Nanowires and Fabrication of High Performance Nanosensors Based on a Single Fe2O3 Nanowire 
    LUPAN, Oleg; POSTICA, Vasile; WOLFF, Niklas; POLONSKYI, Oleksandr; DUPPEL, Viola; KAIDAS, Victor; LAZARI, Eugen; ABABII, Nicolai; FAUPEL, Franz; KIENLE, Lorenz; ADELUNG, Rainer (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2017)
    A composed morphology of iron oxide microstructures covered with very thin nanowires (NWs) with diameter of 15–50 nm has been presented. By oxidizing metallic Fe microparticles at 255 °C for 12 and 24 h, dense iron oxide ...
  • Low powered, tunable and ultra-light aerographite sensor for climate relevant gas monitoring 
    LUPAN, O.; POSTICA, V.; MECKLENBURG, M.; SCHULTE, K.; MISHRA, Y. K.; FIEDLER, B.; ADELUNG, R. (The Royal Society of Chemistry, 2016)
    Increasing atmospheric CO2 gas pollution and emergence of new types of green energy sources require continuous environmental monitoring. In this context, fast, efficient, light, robust, and reliable gas sensors that can ...
  • Low-Temperature Solution Synthesis of Au-Modified ZnO Nanowires for Highly Efficient Hydrogen Nanosensors 
    LUPAN, Oleg; POSTICA, Vasile; WOLFF, Niklas; SU, Jun; LABAT, Frédéric; CIOFINI, Ilaria; CAVERS, Heather; ADELUNG, Rainer; POLONSKYI, Oleksandr; FAUPEL, Franz; KIENLE, Lorenz; VIANA, Bruno; PAUPORTÉ, Thierry (American Chemical Society, 2019)
    In this research, the low-temperature single-step electrochemical deposition of arrayed ZnO nanowires (NWs) decorated by Au nanoparticles (NPs) with diameters ranging between 10 and 100 nm is successfully demonstrated for ...
  • Measuring approach for semiconductor nanostructured gas sensors parameters 
    VERJBITKI, Valeriu; RAILEAN, Serghei; LUPAN, Oleg (Tehnica UTM, 2019)
    The development of new technologies for extracting and testing the parameters of nanostructures based on semiconductor oxides required the development of special instruments for measuring the parameters of such structures ...
  • Microheaters for copper oxide based gas sensors 
    TROFIM, Viorel; ABABII, Nicolai; LUPAN, Oleg (Tehnica UTM, 2019)
    In recent years, gas sensors based on oxide semiconductors such as copper oxide [1], have a very high development progress, as their market demands are high for the detection of toxic and flammable gases, as well as their ...
  • Microheaters for copper oxide-based gas sensors 
    ABABII, Nicolai; TROFIM, Viorel; LUPAN, Oleg (Tehnica UTM, 2020)
    This paper describes two procedures developed for obtaining microheaters for copper oxide-based gas sensors. Different types of substrates (glass, SiO2/Si and ceramic) are investigated, as well as different configurations ...
  • Microsensor on single ZnO microwire 
    CHAI, G.; RUSU, E.; CHOW, L.; STRATAN, G. I.; HEINRICH, H.; PARK, S.; SCHULTE, A.; LUPAN, O.; TROFIM, V.; RAILEAN, S. (Institute of Electrical and Electronics Engineerings, IEEE, 2009)
    For development of individual ZnO microwire in hydrogen sensors an environmentally benign synthesis process and fabrication route are required. Here we report a synthesis route for ZnO microwires using vapour phase process. ...

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