Browsing Articole ştiinţifice by Author "VIANA, B."

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Blue-red electroluminescence from hybrid Eu:phosphors/ZnO-nanowires/p-GaN LED

VIANA, B.; PAUPORTE, T.; LUPAN, O.; DEVIS, L.; GACOIN, T. (SPIE, Society of Photo-Optical Instrumentation Engineers, 2014)

Nanowire (NW) based light emitting diodes (LEDs) have drawn great research interest due to many advantages compared to thin film based devices. Marked improved performances are expected from nanostructured active layers ...
Blue-red electroluminescence from hybrid Eu:phosphors/ZnO-nanowires/p-GaN LED

VIANA, B.; PAUPORTE, T.; LUPAN, O.; DEVIS, L.; GACOIN, T. (SPIE, 2021)

Nanowire (NW) based light emitting diodes (LEDs) have drawn great research interest due to many advantages compared to thin film based devices. Marked improved performances are expected from nanostructured active layers ...
Comparative study of the ZnO and Zn1−xCdxO nanorod emitters hydrothermally synthesized and electrodeposited on p-GaN

LUPAN, O.; PAUPORTÉ, T.; CHOW, L.; CHAI, G.; VIANA, B.; URSAKI, V. V.; MONAICO, E.; TIGINYANU, I. M. (ELSEVIER, 2012)

Hydrothermal synthesis and electrodeposition are low-temperature and cost-effective growth techniques of high quality nanostructured active materials for opto-electronic devices. Here we report a hydrothermal seed layer-free ...
Detectors based on Pd-doped and PdO-functionalized ZnO nanostructures

POSTICA, V.; LUPAN, O.; ABABII, N.; HOPPE, M.; ADELUNG, R.; CHOW, L.; SONTEA, V.; ASCHEHOUG, P.; VIANA, B.; PAUPORTÉ, Th. (SPIE, 2018)

In this work, zinc oxide (ZnO) nanostructured films were grown using a simple synthesis from chemical solutions (SCS) approach from aqueous baths at relatively low temperatures (< 95 °C). The samples were doped with Pd ...
Effects of annealing on properties of ZnO thin films prepared by electrochemical deposition in chloride medium

LUPAN, O.; PAUPORTÉ, T.; CHOW, L.; VIANA, B.; PELLÉ, F.; ONO, L. K.; CUENYA, B. Roldan; HEINRICH, H. (ELSEVIER, 2010)

The development of cost-effective and low-temperature synthesis techniques for the growth of high-quality zinc oxide thin films is paramount for fabrication of ZnO-based optoelectronic devices, especially ultraviolet ...
Electrochemical and Hydrothermal Synthesis of Epitaxial Arrays of Doped Zn Nanowire Emitters for Light Emitting Diodes With Tunable Emission From Near-UV to Blue

PAUPORTE, T.; LUPAN, O.; VIANA, B. (The Electrochemical Society, 2013)

The bandgap control of doped-ZnO nanowires is important for tunable light emitting diodes (LEDs). Ultraviolet (UV), violet, blue and near-white LED structures based on Cu- or Ag-doped ZnO /p-GaN and Cd-alloyed ZnO (Zn1-xCdxO) ...
Electrodeposition of Cu-doped ZnO nanowire arrays and heterojunction formation with p-GaN for color tunable light emitting diode applications

LUPAN, O.; PAUPORTÉ, T.; VIANA, B.; ASCHEHOUG, P. (ELSEVIER, 2011)

Copper-doped zinc oxide (ZnO:Cu) nanowires (NWs) were electrochemically deposited at low temperature on fluor-doped tin oxide (FTO) substrates. The electrochemical behavior of the Cu–Zn system for Cu-doped ZnO electrodeposition ...
Epitaxial Electrodeposition of ZnO Nanowire Arrays on p-GaN for Efficient UV-Light-Emitting Diode Fabrication

LUPAN, O.; PAUPORTÉ, T.; VIANA, B.; TIGINYANU, I. M.; URSAKI, V. V.; CORTÈS, R. (American Chemical Society, 2010)

The electrochemical growth of ZnO nanowire arrays on p-type GaN (0001) single crystalline thin films supported on sapphire is demonstrated for the first time. The deposited ZnO-NWs exhibited a very low density of intrinsic ...
Eu-doped ZnO nanowire arrays grown by electrodeposition

LUPAN, O.; PAUPORTÉ, T.; VIANA, B.; ASCHEHOUG, P.; AHMADI, M.; ROLDAN CUENYA, B.; RUDZEVICH, Y.; LIN, Y.; CHOW, L. (ELSEVIER, 2013)

The preparation of efficient light emitting diodes requires active optical layers working at low voltage for light emission. Trivalent lanthanide doped wide-bandgap semiconducting oxide nanostructures are promising active ...
H2 gas sensing properties of a ZnO/CuO and ZnO/CuO/Cu2O Heterostructures

ABABII, N.; POSTICA, V.; HOPPE, M.; ADELUNG, R.; LUPAN, O.; RAILEAN, S.; PAUPORTÉ, T.; VIANA, B. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2017)

The most important parameters of gas sensors are sensitivity and especially high selectivity to specific chemical species. To improve these parameters we developed sensor structures based on layered semiconducting oxides, ...
Influence of CuO nanostructures morphology on hydrogen gas sensing performances

LUPAN, O.; POSTICA, V.; ABABII, N.; HOPPE, M.; CRETU, V.; TIGINYANU, I.; SONTEA, V.; PAUPORTÉ, Th.; VIANA, B.; ADELUNG, R. (ELSEVIER, 2016)

In this study, the impact of different morphologies of p-type copper oxide nanostructures on hydrogen gas response is investigated. Sensor structures based on CuO nanowire (NW) networks demonstrated much higher gas response ...
Low temperature preparation of Ag-doped ZnO nanowire arrays for sensor and light-emitting diode applications

LUPAN, O.; VIANA, B.; CRETU, V.; POSTICA, V.; ADELUNG, R.; PAUPORTÉ, T. (SPIE, Society of Photo-Optical Instrumentation Engineers, 2016)

Transition metal doped-oxide semiconductor nanostructures are important to achieve enhanced and new properties for advanced applications. We describe the low temperature preparation of ZnO:Ag nanowire/nanorod (NW/NR) arrays ...
Low-Temperature Growth of ZnO Nanowire Arrays on p-Silicon (111) for Visible-Light-Emitting Diode Fabrication

LUPAN, O.; PAUPORTE, T.; VIANA, B. (American Chemical Society, 2010)

We report on the successful growth of homogeneous and well-covering ZnO nanowire arrays at a low temperature (90 °C) directly on a p-type Si(111) wafer by an electrochemical method. The wires were self-standing and vertically ...
Morphology dependent UV photoresponse of Sn-doped ZnO microstructures

POSTICA, V.; HOPPE, M.; GRÖTTRUP, J.; HAYES, P.; RÖBISCH, V.; SMAZNA, D.; ADELUNG, R.; VIANA, B.; ASCHEHOUG, P.; PAUPORTÉ, T.; LUPAN, O. (ELSEVIER, 2017)

In this work, the UV sensing properties of Sn-doped and/or alloyed zinc oxide (ZnO) microstructures with different morphologies were investigated in order to elaborate the high performance UV photodetectors. We have compared ...
Oxide planar p–n heterojunction prepared by low temperature solution growth for UV-photodetector applications

LUPAN, O.; KOUSSI-DAOUD, S.; VIANA, B.; PAUPORTÉ, T. (The Royal Society of Chemistry, 2016)

The paper presents the low temperature growth of a planar p-NiO/n-ZnO/FTO heterostructure for efficient detection of soft UV light. n-ZnO was prepared at 60°C using an aqueous bath of zinc nitrate precursor. The 2D layer ...
Tunable electroluminescence from low-threshold voltage LED structure based on electrodeposited Zn1−xCdxO-nanorods/p-GaN heterojunction

PAUPORTÉ, Th.; LUPAN, O.; VIANA, B. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2012)

Violet light-emitting diode (LED) structures based on Cd-alloyed zinc oxide (Zn1−xCdxO) nanorods (NRs)/p-GaN heterojunction have been fabricated by epitaxial electrodeposition at low temperatures in an aqueous soft bath ...
UV nanophotodetector based on a single ZnO:Au nanowire functionalized with Au-nanoparticles

POSTICA, V.; PAUPORTÉ, Th.; VIANA, B.; CAVERS, H.; HOPPE, M.; ADELUNG, R.; LUPAN, O. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2020)

In this work, an individual nanowire of zinc oxide (ZnO-NW), decorated with gold nanoparticles (Au-NPs/ZnO-NW), was integrated in a nanophotodetector using a dual beam focused electron/ion beam (FIB/SEM) system. Au-NPs/ZnO-NW ...
UV radiation and CH4 gas detection with a single ZnO:Pd nanowire

LUPAN, O.; ADELUNG, R.; POSTICA, V.; ABABII, N.; SHOW, L.; VIANA, B.; PAUPORTÉ, T. (SPIE, Society of Photo-Optical Instrumentation Engineers, 2017)

There is an increasing demand for sensors to monitor environmental levels of ultraviolet (UV) radiation and pollutant gases. In this work, an individual nanowire of Pd modified ZnO nanowire (ZnO:Pd NW) was integrated in a ...
UV-Blue and Green Electroluminescence from Cu-Doped ZnO Nanorod Emitters Hydrothermally Synthesized on p-GaN

LUPAN, O.; PAUPORTE, T.; VIANA, B.; URSAKI, V. V.; TIGINYANU, I. M.; SONTEA, V.; CHOW, L. (American Scientific Publishers, 2012)

Aqueous solution synthesis of ZnO nanorods on p-GaN(0001) is a low-temperature (< 100 C) and cost-efficient growth technique of high quality emitters for LED applications. We present morphological, optical and structural ...
ZnO Nanowire emitters for tunable near-UV-Blue Light emitting diodes

VIANA, B.; LUPAN, O.; PAUPORTÉ, T. (Vinča Institute of Nuclear Sciences Belgrade, Serbia, 2011)

We have shown that the emission wavelength could be tuned and shift toward the violet-blue region by up to 40 nm by doping with Cu or Cd . Our results clearly state the remarkable quality of the pure and doped-ZnO ...

Browsing Articole ştiinţifice by Author "VIANA, B."

Browsing Articole ştiinţifice by Author "VIANA, B."

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