Oxide nanostructurers

Fig. 14. SEM images of cuprous oxide nanostructures (A) 100 x, (B) 1,000 x, and (C) Schematic illustration of the dendrite structure formation process.

We refrain here from giving an extensive overview of studies on the surface structure of vanadium oxide nanolayers, as this has already been done for up to year 2003 in our recent review [97]. Instead, we would like to focus on prototypical examples, selected from the V-oxide-Rh(l 1 1) phase diagram, which demonstrate the power of STM measurements, when combined with state-of-the-art DFT calculations, to resolve complex oxide nanostructures. Other examples will highlight the usefulness of combining STM and STS data on a local scale, as well as data from STM measurements, and sample area-averaging spectroscopic techniques, such as XPS and NEXAFS, to derive as complete a picture as possible of the investigated system. 

Ku, C.-H. Wu, J.-J. 2006. Aqueous solution route to high-aspect-ratio zinc oxide nanostructures on indium tin oxide substrates. J. Phys. Chem. B 110 12981-12985. 

In conclusion, these data do not allow concluding whether or not Titania nanotubes form better catalysts due to their intrinsic nanostructure, and not simply because they have a high geometrical surface area and provide a good dispersion of supported catalysts. These properties may be found in other Titania based catalysts not having a ID nanostructure. On the other hand, it is also clear from above comments that most of the studies up to now were justified essentially from the curiosity to use a novel support more than from the rational design of advanced catalysts, which use the metal oxide nanostructure as a key component to develop... 

Yu, K., et al., Significant improvement of field emission by depositing zinc oxide nanostructures on screen-printed carbon nanotube films. Applied Physics Letters, 2006. 88(15) p. 153123. 

Although several studies have been dedicated to analyzing the relationship between nanostructure of supported metal particles and catalytic behaviour, fewer studies have been dedicated to growing controlled oxide nanostructures and their relationship to catalytic reactivity. 

In addition, materials prepared by anodization permit the growth of the oxide nanostructured film over a conductive substrate (Ti foil), an important aspect for preparation of robust electrodes. As discussed later, electrical contact with the conductive substrate could be further improved using carbon nano tubes. 

As pointed out in part 1, ° ID oxide nanostructures do not represent only particles with high elongation ratio, but possess different spedfie eharaeteristics related to the nanostructure. For example, O2 adsorption is different from that observed for Ti02 single erystals and this has consequenees on the catalytic behaviour. In order to exploit the properties of ID oxide nanostructure, however, it is essential to orient nanotubes on substrates and to create ordered arrays. 

Carreon MA, Guliants W. Chapter 6 selective oxidation of n-butane over vanadium-phosphorous oxide. Nanostructured Catalysts Selective Oxidations The Royal Society of Chemistry 2011. p. 141-168. 

Sui R, Charpentier P. Synthesis of metal oxide nanostructures by direct Sol-Gel chemistry in supercritical fluids. Chemical Reviews. 2012 112(6) 3057-3082. 

Netzer FP, Allegretti F, Surnev S. Low-dimensional oxide nanostructures on metals hybrid systems with novel properties. J Vac Sci Technol B. 2010 28 1-16. 

Ammonia sensors based on metal oxide nanostructures... 

In figure 4 we show the Raman spectra of the various metal oxide nanostructures studied by us. Raman bands are found at 332,441 and 1076 cm"1 for the ZnO nanoparticles and nanorods [20], Bulk ZnO shows Raman bands at 330 and 439 cm-1 [20, 21]. The nanoparticles and nanorods of ln203 show Raman bands at 305, 364, 495 and 630 cm-1. 

Figure 4. Raman spectra of the various oxide nanostructures.

Figure 14. Comparison of the sensitivities of the different oxide nanostructures for sensing NHi.

Wang, G., W. Lu, J.H. Li, J. Choi, Y.S. Jeong, S.Y. Choi, J.B. Park, M.K. Ryu and K. Lee (2006b). V-shaped tin oxide nanostructures featuring a broad photocurrent signal An effective visible-light-driven photocatalyst. Small, 2(12), 1436-1439. 

Wang, Z. L. (2004). Zinc oxide nanostructures growth, properties and applications. J. Phys. Condensed Matter 16 R829-R858. 

SPECTRAL INVESTIGATIONS OF DYE MODIFIED SILICON OXIDE NANOSTRUCTURES... 

Figure 2, a) AFM image of silicon oxide nanostructure on dodecene-terminated silicon b) wide field microscope image of the dye treated nanostiucture under light excitation (514 nm),... 

Spectral investigations of dye modified silicon oxide nanostructures 212... 

Schoiswohl J, Sock M, Chen Q, Thornton G, Kresse G, Ramsey MG, et al. (2007). Metal supported oxide nanostructures model systems for advanced catalysis. Top Catal, 46, 137... 

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