Self-encapsulation of single-texture CoSi2 nanolayer by TaSi2

Akhavan, Omid; Azimirad, R.; Moshfegh, A.Z.

doi:10.1016/j.tsf.2007.10.100

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…Some electrical characteristics of the graphene oxide sheets and the graphene nanomeshes can also be examined by using XPS. In fact, XPS analysis at low binding energies can determine the electron density of the valence band on the surface of the films, as previously reported for graphene- and silicide-based materials Figure presents XPS spectra of the graphene nanomeshes, as compared to the spectrum of the graphene oxide sheets.…”

Section: Resultsmentioning

confidence: 79%

“…In fact, XPS analysis at low binding energies can determine the electron density of the valence band on the surface of the films, as previously reported for graphene- 55 and silicide-based materials. 56 Figure 6 presents XPS spectra of the graphene nanomeshes, as compared to the spectrum of the graphene oxide sheets. For the graphene oxide sheets, the valence band was found to be very far from the Fermi level (E f ).…”

Section: Resultsmentioning

confidence: 99%

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Graphene Nanomesh by ZnO Nanorod Photocatalysts

2010

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Local photodegradation of graphene oxide sheets at the tip of ZnO nanorods was used to achieve semiconducting graphene nanomeshes. The chemically exfoliated graphene oxide sheets, with a thickness of approximately 0.9 nm, were deposited on quartz substrates. Vertically aligned ZnO nanorod arrays with diameters of 140 nm and lengths of <1 microm were grown on a glass substrate by using a hydrothermal method. The graphene oxide sheets were physically attached to the tip of the ZnO nanorods by assembling the sheets on the nanorods. UV-assisted photodegradation of the graphene oxide sheets (with dimension of approximately 5x5 microm) at a contact place with the ZnO nanorods resulted in graphene nanomeshes with a pore size of approximately 200 nm. The graphene nanomeshes prepared by using the photocatalytic property of the ZnO nanorods contained smaller oxygen-containing carbonaceous bonds and higher defects as compared to the as-prepared graphene oxide sheets. When chemical reduction of the graphene nanomeshes by hydrazine was used, the oxygen bonds of the nanomeshes more decreased while their graphitization increased. Based on X-ray photoelectron spectroscopy at low binding energies, the graphene nanomeshes reduced by hydrazine exhibited as a broad sheet a p-type semiconductor with an approximately 1.2 eV energy gap between the valence band and the Fermi level.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Graphene Nanomesh by ZnO Nanorod Photocatalysts

2010

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“…In this work, however, it is shown that self-agglomeration of the substantially metallic silver nanoparticles (>90% in the metallic state) on the surface of the dried silica matrix is possible. Elsewhere [54], we have shown in some detail that the self-agglomeration of the metallic silver nanoparticles on the surface is related to the amount of water in the silica gel. Concerning the silica matrix, we have observed that by increasing the temperature from 100 to 400 • C the matrix experiences a transition from silica and even silica gel to the silica with an ionic structure.…”

Section: Discussionmentioning

confidence: 96%

Physical characteristics of heat-treated nano-silvers dispersed in sol–gel silica matrix

et al. 2006

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Silica films containing various concentrations of Ag nanoparticles were deposited on glass slides using a sol–gel process and then heat-treated in air at different temperatures. The films were analysed by using UV–visible spectrophotometry, atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS) for their optical, surface morphological as well as structural, and chemical properties. After heat-treatment, the optical absorption peaks of Ag nanoparticles show a blueshift and an intensity reduction due to particle size reduction and AgOx nanoparticle formation, respectively. The particle size reduction and surface morphology changes in the films were observed by AFM and TEM as a function of heat-treatment temperature and Ag concentration. Using AFM and XPS analyses, we have found that the Ag nanoparticles accumulated on the surface diffuse into the substrate as the heat-treatment temperature increases. XPS analysis also showed that the silver oxidation occurs during the heat-treatment, causing the reduction of absorption intensity. By controlling the Ag concentration and the heat-treatment temperature, we could change the silica structure, and tailor the average size of the silver nanoparticles down to less than 4 nm.

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“…The introduction of intermediate layer such as Ti, Ta and Zr, C between Co and Si enhances epitaxial growth of CoSi 2 on Si (1 0 0). It was reported that these refractory metal reduce native oxide layer that resulted smooth interface between CoSi 2 and Si [29][30][31][32]. However, CoSi 2 layer can also grow epitaxially on Si (1 1 1) substrate without the introduction of any intermediate layer, because in this case CoSi 2 (1 1 1) plane matches with Si (1 1 1) orientation plane [33].…”

Section: Introductionmentioning

confidence: 99%