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Search for "oxygen vacancy" in Full Text gives 38 result(s) in Beilstein Journal of Nanotechnology.

Laser irradiation in water for the novel, scalable synthesis of black TiOx photocatalyst for environmental remediation

  • Massimo Zimbone,
  • Giuseppe Cacciato,
  • Mohamed Boutinguiza,
  • Vittorio Privitera and
  • Maria Grazia Grimaldi

Beilstein J. Nanotechnol. 2017, 8, 196–202, doi:10.3762/bjnano.8.21

Graphical Abstract
  • Figure 5. The measured absorbance is higher than 90% in the range from 0.35 to 5 eV (from 3.5 to 0.25 µm in wavelength). The high absorption and black coloration is ascribed to reduced oxidation states of Ti (electrons in the Ti 3d states) and to the presence of H in association with an oxygen vacancy
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Published 19 Jan 2017

Scanning probe microscopy studies on the adsorption of selected molecular dyes on titania

  • Jakub S. Prauzner-Bechcicki,
  • Lukasz Zajac,
  • Piotr Olszowski,
  • Res Jöhr,
  • Antoine Hinaut,
  • Thilo Glatzel,
  • Bartosz Such,
  • Ernst Meyer and
  • Marek Szymonski

Beilstein J. Nanotechnol. 2016, 7, 1642–1653, doi:10.3762/bjnano.7.156

Graphical Abstract
  • electronic states of molecules in the planar conformation. If molecules in the planar configuration are positioned on an oxygen vacancy, the HOMO resonance shifts outward from the Fermi level by about −0.4 V with respect to that of the molecule sitting on non-defected area [59]. The HOMO−1 state of the same
  • molecule is hardly affected by the presence of the defect. As soon as molecules in the non-planar configuration are moved onto an oxygen vacancy, the LUMO state is only slightly shifted with respect to its position for molecules located away from oxygen vacancies. The authors also discussed the possible
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Commentary
Published 09 Nov 2016

High photocatalytic activity of V-doped SrTiO3 porous nanofibers produced from a combined electrospinning and thermal diffusion process

  • Panpan Jing,
  • Wei Lan,
  • Qing Su and
  • Erqing Xie

Beilstein J. Nanotechnol. 2015, 6, 1281–1286, doi:10.3762/bjnano.6.132

Graphical Abstract
  • above room temperature in air, generally, the oxygen vacancy is one of the most important defects that can be easily introduced [31]. The crystal cell is then distorted and the cell volume or lattice constant is reduced. However, if a few Ti4+ ions are substituted by V5+ ions, some oxygen vacancies will
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Letter
Published 09 Jun 2015

In situ scanning tunneling microscopy study of Ca-modified rutile TiO2(110) in bulk water

  • Giulia Serrano,
  • Beatrice Bonanni,
  • Tomasz Kosmala,
  • Marco Di Giovannantonio,
  • Ulrike Diebold,
  • Klaus Wandelt and
  • Claudio Goletti

Beilstein J. Nanotechnol. 2015, 6, 438–443, doi:10.3762/bjnano.6.44

Graphical Abstract
  • for adsorption [6]. Interestingly, San Miguel et al. [6] report that from increasing the surface coverage of the surface as well as reducing the proximity to an oxygen vacancy, a significant reduction of the adsorption energy for Ca results. This means that calcium dissolution from the TiO2 surface
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Published 12 Feb 2015

Morphology, structural properties and reducibility of size-selected CeO2−x nanoparticle films

  • Maria Chiara Spadaro,
  • Sergio D’Addato,
  • Gabriele Gasperi,
  • Francesco Benedetti,
  • Paola Luches,
  • Vincenzo Grillo,
  • Giovanni Bertoni and
  • Sergio Valeri

Beilstein J. Nanotechnol. 2015, 6, 60–67, doi:10.3762/bjnano.6.7

Graphical Abstract
  • the surface to volume ratio and to the oxygen vacancy energy formation [27]. After a thermal treatment at 1020 K, these differences in the Ce3+ component intensities are less significant; in agreement with the results reported in [27], the oxygen vacancy formation energy is related with NPs size, in
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Published 07 Jan 2015

Nanostructure sensitization of transition metal oxides for visible-light photocatalysis

  • Hongjun Chen and
  • Lianzhou Wang

Beilstein J. Nanotechnol. 2014, 5, 696–710, doi:10.3762/bjnano.5.82

Graphical Abstract
  • CdSe to TiO2 via oxygen vacancy states mediated by N-doping [39][40]. There are also a large number of heterostructures in literature consisting of quantum dots and transition metal oxides, for instance, CdS/CdSe co-sensitized TiO2 [41], CdTe or CdTe/CdSe quantum dots on TiO2 nanotube arrays [42][43
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Review
Published 23 May 2014

The role of oxygen and water on molybdenum nanoclusters for electro catalytic ammonia production

  • Jakob G. Howalt and
  • Tejs Vegge

Beilstein J. Nanotechnol. 2014, 5, 111–120, doi:10.3762/bjnano.5.11

Graphical Abstract
  • the fabrication process. Formation of ammonia at relative high oxygen coverage Nitrogen molecules are not able to adsorb to neither an oxygen vacancy site nor ontop of an oxygen atom at high oxygen coverages. Once the oxygen skin has been partially reduced, the nitrogen molecules adsorb onto the
  • surface at the oxygen vacancy sites, see Figure 3b. The adsorption of nitrogen become stable at a coverage of less than 10 oxygen atoms, see Table 4. The adsorption energies of N2 range from −1.0 eV to −1.8 eV depending on the oxygen coverage. The corresponding hydrogen adsorption energies are lower
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Published 31 Jan 2014

Modulation of defect-mediated energy transfer from ZnO nanoparticles for the photocatalytic degradation of bilirubin

  • Tanujjal Bora,
  • Karthik K. Lakshman,
  • Soumik Sarkar,
  • Abhinandan Makhal,
  • Samim Sardar,
  • Samir K. Pal and
  • Joydeep Dutta

Beilstein J. Nanotechnol. 2013, 4, 714–725, doi:10.3762/bjnano.4.81

Graphical Abstract
  • ; Förster resonance energy transfer (FRET); neonatal jaundice; oxygen vacancy; photocatalysis; phototherapy; zinc oxide nanoparticles; Introduction Bilirubin (BR) is a yellow-orange pigment which is a byproduct of the normal heme catabolism in mammals. In the human body, 250–400 mg BR is produced every day
  • ]. It has been reported that the native defects in the ZnO lattice, mostly the oxygen vacancy sites, play an important role in the photocatalytic activity of the nanostructures [11]. Oxygen vacancies have been reported as the cause of the characteristic green luminescence of ZnO [12][13][14]. These
  • large and broad green–yellow emission centered at around 530 nm, which can be attributed to the oxygen vacancy defect states (mostly present at the surface of the nanoparticles) [27]. A. van Dijken et al. [28] have proposed the transition of a photo-excited electron from the conduction band of ZnO to a
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Published 04 Nov 2013

Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition

  • Adib Abou Chaaya,
  • Roman Viter,
  • Mikhael Bechelany,
  • Zanda Alute,
  • Donats Erts,
  • Anastasiya Zalesskaya,
  • Kristaps Kovalevskis,
  • Vincent Rouessac,
  • Valentyn Smyntyna and
  • Philippe Miele

Beilstein J. Nanotechnol. 2013, 4, 690–698, doi:10.3762/bjnano.4.78

Graphical Abstract
  • defect concentration and diminishes at annealing in an oxygen environment (oxygen vacancy healing) [21]. One of the methods applied to analyze the crystalline structure and defect level in zinc oxide is photoluminescence. It has been shown that ZnO exhibits a narrow UV emission band in the 378–381 nm
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Published 28 Oct 2013

Characterization of electroforming-free titanium dioxide memristors

  • John Paul Strachan,
  • J. Joshua Yang,
  • L. A. Montoro,
  • C. A. Ospina,
  • A. J. Ramirez,
  • A. L. D. Kilcoyne,
  • Gilberto Medeiros-Ribeiro and
  • R. Stanley Williams

Beilstein J. Nanotechnol. 2013, 4, 467–473, doi:10.3762/bjnano.4.55

Graphical Abstract
  • technique has been used for previous studies of the single layer TiO2 memristor devices and can identify the presence of spatially-localized channels of oxygen vacancy rich Ti–O phases through analysis of the near-edge X-ray absorption fine structure (NEXAFS) [26]. After electrical operation of the
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Published 07 Aug 2013

Photoresponse from single upright-standing ZnO nanorods explored by photoconductive AFM

  • Igor Beinik,
  • Markus Kratzer,
  • Astrid Wachauer,
  • Lin Wang,
  • Yuri P. Piryatinski,
  • Gerhard Brauer,
  • Xin Yi Chen,
  • Yuk Fan Hsu,
  • Aleksandra B. Djurišić and
  • Christian Teichert

Beilstein J. Nanotechnol. 2013, 4, 208–217, doi:10.3762/bjnano.4.21

Graphical Abstract
  • corresponding energy-level diagram also accounting for the band bending due to surface states is presented in Figure 6. The model involves a two-step process where an oxygen vacancy VO changes its state from nonconductive (α-configuration of defect localized state (DLS), ) to conductive (β-configuration of DLS
  • an oxygen vacancy are marked as (1), (2) and (3), respectively. Acknowledgements This work was financially supported by the Austrian Science Fund (FWF) under Project No. P19636-N20.
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Published 21 Mar 2013

Plasmonics-based detection of H2 and CO: discrimination between reducing gases facilitated by material control

  • Gnanaprakash Dharmalingam,
  • Nicholas A. Joy,
  • Benjamin Grisafe and
  • Michael A. Carpenter

Beilstein J. Nanotechnol. 2012, 3, 712–721, doi:10.3762/bjnano.3.81

Graphical Abstract
  • vacancies in each of the films. For the calculation of the oxygen-vacancy concentration in all films, a general assumption was that the YSZ film had a cubic fluorite lattice structure. The calculations were performed by taking into account the deposited area, thickness and lattice parameter of the YSZ film
  • medium-particle sample and 4.08 × 1015/cm2 for the large-particle sample. Given the proposed reaction mechanism, the enhanced response towards H2 for the small-particle sample may be due to the highest oxygen vacancy concentration in this film among all the samples, which would facilitate an increase in
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Published 31 Oct 2012

Functionalised zinc oxide nanowire gas sensors: Enhanced NO2 gas sensor response by chemical modification of nanowire surfaces

  • Eric R. Waclawik,
  • Jin Chang,
  • Andrea Ponzoni,
  • Isabella Concina,
  • Dario Zappa,
  • Elisabetta Comini,
  • Nunzio Motta,
  • Guido Faglia and
  • Giorgio Sberveglieri

Beilstein J. Nanotechnol. 2012, 3, 368–377, doi:10.3762/bjnano.3.43

Graphical Abstract
  • which a gas sensor can achieve enhanced response in the case of ZnO nanowire sensors. For instance it is well known that gas sensitivity to NO2 is linearly proportional to oxygen-vacancy-related defects [25]. THMA-SAMs appeared to have little effect on ΔR/R with NO2 exposure, so in this case the surface
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Published 02 May 2012
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