Photocurrent generation in carbon nanotube/cubic-phase HfO2 nanoparticle hybrid nanocomposites
| Autor: | Erwan Rauwel, F. Ducroquet, Augustinas Galeckas, Martin Salumaa, Protima Rauwel |
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| Přispěvatelé: | University of Tartu, Institute of Physics, University of Oslo (UiO), Tallinn University of Technology, Tartu College, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Estonian Research Council (grant PUT431), European Regional Development Fund project TK134 (TAR16019) Norwegian Research Council, Estonian Road Map infrastructure NAMUR, PHC - Parrot program n°33787YJ |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Absorption spectroscopy General Physics and Astronomy Nanotechnology 02 engineering and technology Carbon nanotube 010402 general chemistry photocurrent lcsh:Chemical technology 01 natural sciences lcsh:Technology Full Research Paper law.invention law General Materials Science lcsh:TP1-1185 Electrical and Electronic Engineering [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics Absorption (electromagnetic radiation) lcsh:Science HfO2 Surface states Photocurrent carbon nanotubes business.industry lcsh:T Electron energy loss spectroscopy 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Nanoscience Optoelectronics nanoparticles lcsh:Q 0210 nano-technology business Hybrid material lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 7, Iss 1, Pp 1075-1085 (2016) Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Karlsruhe Institute of Technology., 2016, 7, pp.1075-1085. ⟨10.3762/bjnano.7.101⟩ |
| ISSN: | 2190-4286 |
| Popis: | A hybrid material consisting of nonfunctionalized multiwall carbon nanotubes (MWCNTs) and cubic-phase HfO2 nanoparticles (NPs) with an average diameter of 2.6 nm has been synthesized. Free standing HfO2 NPs present unusual optical properties and a strong photoluminescence emission in the visible region, originating from surface defects. Transmission electron microscopy studies show that these NPs decorate the MWCNTs on topological defect sites. The electronic structure of the C K-edge in the nanocomposites was probed by electron energy loss spectroscopy, highlighting the key role of the MWCNT growth defects in anchoring HfO2 NPs. A combined optical emission and absorption spectroscopy approach illustrated that, in contrast to HfO2 NPs, the metallic MWCNTs do not emit light but instead expose their discrete electronic structure in the absorption spectra. The hybrid material manifests characteristic absorption features with a gradual merger of the MWCNT π-plasmon resonance band with the intrinsic defect band and fundamental edge of HfO2. The photoluminescence of the nanocomposites indicates features attributed to combined effects of charge desaturation of HfO2 surface states and charge transfer to the MWCNTs with an overall reduction of radiative recombination. Finally, photocurrent generation under UV–vis illumination suggests that a HfO2 NP/MWCNT hybrid system can be used as a flexible nanodevice for light harvesting applications. |
| Databáze: | OpenAIRE |
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