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Browsing Articole ştiinţifice by Author "VIANA, Bruno"

Browsing Articole ştiinţifice by Author "VIANA, Bruno"

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  • Comparison of Thermal Annealing versus Hydrothermal Treatment Effects on the Detection Performances of ZnO Nanowires 
    LUPAN, Oleg; MAGARIU, Nicolae; KHALEDIALIDUSTI, Rasoul; MISHRA, Abhishek Kumar; HANSEN, Sandra; KRÜGER, Helge; POSTICA, Vasile; HEINRICH, Helge; VIANA, Bruno; ONO, Luis Katsuya; CUENYA, Beatriz Roldan; CHOW, Lee; ADELUNG, Rainer; PAUPORTÉ, Thierry (American Chemical Society, 2021)
    A comparative investigation of the post-electroplating treatment influence on the gas detecting performances of single ZnO nanorod/nanowire (NR/NW), as grown by electrochemical deposition (ECD) and integrated into nanosensor ...
  • Controlled Mixed Violet–Blue–Red Electroluminescence from Eu:Nano-Phosphors/ZnO-Nanowires/p-GaN Light-Emitting Diodes 
    LUPAN, Oleg; VIANA, Bruno; PAUPORTE, Thierry; DHAOUADI, Maroua; PELLE, Fabienne; DEVYS, Lucie; GACOIN, Thierry (American Chemical Society, 2013)
    Europium (Eu):Y2O3-nanoparticles/Mg:ZnO-nanowires/p-GaN and (Eu):chelate-based light-emitting diode (LED) structures have been fabricated, showing controlled mixed near-UV, violet, and red electroluminescence from trivalent ...
  • Controlling the properties of electrodeposited ZnO nanowire arrays for light emitting diode, photodetector and gas sensor applications 
    PAUPORTÉ, T.; LUPAN, Oleg; VIANA, Bruno; CHOW, Lee; TCHERNYCHEVA, Maria (SPIE, 2014)
    Electrochemical deposition (ECD) is a versatile technique for the preparation of ZnO nanowires (NWs) and nanorods (NRs) with high structural and optical quality. The bandgap of the ZnO NWs can be engineered by doping. ...
  • Directional and magnetic field enhanced emission of Cu-doped ZnO nanowires/p-GaN heterojunction light-emitting diodes 
    VIANA, Bruno; LUPAN, Oleg; PAUPORTÉ, Thierry (Society of Photo-Optical Instrumentation Engineers (SPIE), 2011)
    The electrochemical deposition technique was used for the preparation of Cu-doped ZnO-nanowire-based emitters. Nanowires of high structural and optical quality were epitaxially grown on p-GaN single crystalline film ...
  • Effect of noble metal functionalization and film thickness on sensing properties of sprayed TiO2 ultra-thin films 
    ABABII, Nicolai; HOPPE, Mathias; SHREE, Sindu; VAHL, Alexander; ULFA, Maria; PAUPORTÉ, Thierry; VIANA, Bruno; CRETU, Vasilii; MAGARIU, Nicolae; POSTICA, Vasile; SONTEA, Victor; TERASA, Maik-Ivo; POLONSKYI, Oleksandr; FAUPEL, Franz; ADELUNG, Rainer; LUPAN, Oleg (ELSEVIER, 2019)
    In this paper, the effect of the thickness of nano-structured TiO2 thin films (12–40nm) and successive deposition of different noble metal nanoparticles on the performances of propanol vapor and H2 gas sensors was investigated. ...
  • Electrodeposited ZnO nanowire-based light-emitting diodes with tunable emission from near-UV to blue 
    PAUPORTÉ, Thierry; LUPAN, Oleg; VIANA, Bruno (SPIE, Society of Photo-Optical Instrumentation Engineers, 2013)
    The bandgap control of doped-ZnO nanowires is important for tunable light emitting diodes (LEDs). Ultraviolet (UV), blue and violet LED structures based on Ag-doped ZnO /p-GaN and Cd-alloyed ZnO (Zn1-xCdxO) nanorods/p-GaN ...
  • Functionalized Pd/ZnO Nanowires for Nanosensors 
    LUPAN, Oleg; POSTICA, Vasile; ADELUNG, Rainer; LABAT, Frédéric; CIOFINI, Ilaria; SCHÜRMANN, Ulrich; KIENLE, Lorenz; CHOW, Lee; VIANA, Bruno; PAUPORTÉ, Thierry (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2018)
    A method for surface doping and functionalization of ZnO nanowires (NWs) with Pd (Pd/ZnO) in a one-step process is presented. The main advantage of this method is to combine the simultaneous growth, surface doping, and ...
  • High Aspect Ratio Ternary Zn1–xCdxO Nanowires by Electrodeposition for Light-Emitting Diode Applications 
    LUPAN, Oleg; PAUPORTÉ, Thierry; LE BAHERS, Tangui; CIOFINI, Ilaria; VIANA, Bruno (American Chemical Society, 2011)
    We present a combined experimental and computational approach to study Zn1–xCdxO nanowires (NWs) and their integration in light-emitting diode (LED) structures. Self-standing Zn1–xCdxO NWs have been electrodeposited on ...
  • Low-Temperature Preparation of Ag-Doped ZnO Nanowire Arrays, DFT Study, and Application to Light-Emitting Diode 
    PAUPORTÉ, Thierry; LUPAN, Oleg; ZHANG, Jie; TUGSUZ, Tugba; CIOFINI, Ilaria; LABAT, Frédéric; VIANA, Bruno (American Chemical Society, 2015)
    Doping ZnO nanowires (NWs) by group IB elements is an important challenge for integrating nanostructures into functional devices with better and tuned performances. The growth of Ag-doped ZnO NWs by electrodeposition at ...
  • 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 ...
  • Low-Voltage UV-Electroluminescence from ZnO-Nanowire Array/p-GaN Light-Emitting Diodes 
    LUPAN, Oleg; PAUPORTÉ, Thierry; VIANA, Bruno (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2010)
    UV LEDs : The fabrication of an ITO/ZnO-nanowires/p-GaN/In-Ga LED structure is reported with an active emitting layer made of high-quality epitaxial ZnO grown electrochemically from a solution at low temperature (85 °C). ...
  • Pd-Functionalized ZnO:Eu Columnar Films for Room-Temperature Hydrogen Gas Sensing: A Combined Experimental and Computational Approach 
    LUPAN, Cristian; KHALEDIALIDUSTI, Rasoul; MISHRA, Abhishek Kumar; POSTICA, Vasile; TERASA, Maik-Ivo; MAGARIU, Nicolae; PAUPORTÉ, Thierry; VIANA, Bruno; DREWES, Jonas; VAHL, Alexander; FAUPEL, Franz; ADELUNG, Rainer (American Chemical Society, 2020)
    Reducing the operating temperature to room temperature is a serious obstacle on long-life sensitivity with long-term stability performances of gas sensors based on semiconducting oxides, and this should be overcome by new ...
  • PdO/PdO2 functionalized ZnO:Pd films for lower operating temperature H2 gas sensing 
    LUPAN, Oleg; POSTICA, Vasile; HOPPE, Mathias; WOLFF, Niklas; POLONSKYI, Oleksandr; PAUPORTÉ, Thierry; VIANA, Bruno; MAJÉRUS, Odile; KIENLE, Lorenz; FAUPEL, Franz; ADELUNG, Rainer (The Royal Society of Chemistry, 2018)
    Through this work, we propose a novel strategy to grow and modulate the density of PdO/PdO2 nanoparticles uniformly on nanostructured Pd-doped ZnO (ZnO:Pd) films by a one-step solution approach followed by thermal annealing ...
  • Room temperature gas nanosensors based on individual and multiple networked Au-modified ZnO nanowires 
    LUPAN, Oleg; POSTICA, Vasile; PAUPORTÉ, Thierry; VIANA, Bruno; TERASA, Maik-Ivo; ADELUNG, Rainer (ELSEVIER, 2019)
    In this work, we investigated performances of individual and multiple networked Au nanoparticles (NPs)-functionalized ZnO nanowires (NWs) integrated into nanosensor devices using dual beam focused ion beam/scanning electron ...
  • Silver-doped zinc oxide single nanowire multifunctional nanosensor with a significant enhancement in response 
    LUPAN, Oleg; CRETU, Vasilii; POSTICA, Vasile; AHMADI, Mahdi; CUENYA, Beatriz Roldan; CHOW, Lee; TIGINYANU, Ion; VIANA, Bruno; PAUPORTÉ, Thierry; ADELUNG, Rainer (ELSEVIER, 2016)
    Enhanced performances were obtained for nanosensors based on a single nanowire of silver-doped zinc oxide (ZnO:Ag). Arrays of crystalline ZnO:Ag nanowires were synthesized by electrodeposition on F-doped tin oxide coated ...
  • Toward blue emission in ZnO based LED 
    VIANA, Bruno; PAUPORTÉ, Thierry; LUPAN, Oleg; LE BAHERS, Tangui; CIOFINI, Ilaria (SPIE, 2013)
    The bandgap engineering of ZnO nanowires by doping is of great importance for tunable light emitting diode (LED) applications. We present a combined experimental and computational study of ZnO doping with Cd or Cu atoms ...
  • Wavelength-Emission Tuning of ZnO Nanowire-Based Light-Emitting Diodes by Cu Doping: Experimental and Computational Insights 
    LUPAN, Oleg; PAUPORTÉ, Thierry; LE BAHERS, Tangui; VIANA, Bruno; CIOFINI, Ilaria (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2011)
    The band-gap engineering of doped ZnO nanowires is of the utmost importance for tunable light-emitting-diode (LED) applications. A combined experimental and density-functional theory (DFT) study of ZnO doping by copper ...
  • ZnO nanowire-based light-emitting diodes with tunable emission from near-UV to blue 
    PAUPORTÉ, Thierry; LUPAN, Oleg; VIANA, Bruno; LE BAHERS, T. (Society of Photo-Optical Instrumentation Engineers (SPIE), 2013)
    Nanowires (NWs)-based light emitting diodes (LEDs) have drawn large interest due to many advantages compared to thin film based devices. We have successfully prepared epitaxial n-ZnO(NW)/p-GaN heterojunctions using low ...
  • ZnO nanowires for tunable near-UV/blue LED 
    PAUPORTÉ, Thierry; LUPAN, Oleg; VIANA, Bruno (Society of Photo-Optical Instrumentation Engineers (SPIE), 2012)
    Nanowires (NWs)-based light emitting diodes (LEDs) have drawn large interest due to many advantages compared to thin film based devices. Markedly improved performances are expected from nanostructured active layers for ...
  • ZnO-based Nanowires for hybrid low-voltage LED 
    LUPAN, Oleg; PAUPORT, Thierry; VIANA, Bruno (Optical Society of America, 2011)
    Nanowires (NW) based light emitting diodes (LEDs) have drawn large interest due to many advantages compared to thin film devices. Marked improved performances are expected from nanostructured active layers for light emission. ...

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