1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal by Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria

By Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria Zaharescu

This publication offers rainy chemical sol-gel and hydrothermal tools for 1D oxide nanostructure coaching. those tools symbolize an enticing path to multifunctional nanomaterials synthesis, as they're flexible, reasonably cheap and, hence, acceptable for acquiring quite a lot of oxide fabrics with adapted morphology and houses. 3 particular oxides (SiO2, TiO2, ZnO) are mentioned intimately as a way to illustrate the main of the sol-gel and hydrothermal guidance of 1D oxide nanostructures. different oxides synthesized through this technique also are in brief awarded.

Throughout the booklet, the correlation among the tubular constitution and the physico-chemical homes of those fabrics is highlighted. 1D oxide nanostructures show fascinating optical and electric homes, as a result of their limited morphology. moreover, a well-defined geometry will be linked to chemically lively species. for instance, the natural SiO2 nanotubes awarded a mild photocatalytic task, whereas the Pt-doped SiO2 tubular fabrics act as microreactors in catalytic reactions. in relation to titania and titanate nanotubes, huge particular floor quarter and pore quantity, ion-exchange skill, superior mild absorption, and speedy electron-transport potential have attracted major study curiosity. The chemical and actual adjustments (microwave assisted hydrothermal tools) mentioned the following increase the formation kinetics of the nanotubes. The ZnO nanorods/tubes have been ready as random debris or as huge parts of small, orientated 1D ZnO nanostructures on a number of substrates. within the latter case a sol-gel layer is deposited at the substrate sooner than the hydrothermal instruction. utilizing acceptable dopants, coatings of ZnO nanorods with managed electric habit should be obtained.

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Another study indicates [114] that the presence of the Zn2+ during the hydrothermal treatment could determine the formation of the layered H2Ti2O5(H2O) nanosheets. TiNTs with very high degree of crystallization can be obtained after H2O2 treatment under reflux at 40  C for 4 h [84]. This report shows that the oxygen vacancies are compensated by H2O2, a fact sustained by XRD, HR-TEM, and photoluminescence (PL) measurements. Another study [115] has used an electrophoretic deposition, showing that the sodium content of TiNTs was drastically reduced in this process.

Open-ended nanotubes with multiwall structures and an average outer diameter of 8 nm and specific surface area up to 210 m2 gÀ1 were obtained. 44 3 Synthesis of Oxide Nanotubes/Nanorods by Hydrothermal Method Fig. 11 In situ high-temperature XRD of the sample isolated after the treatment in the microwave reactor at 135  C for 8 h (Reprinted from [131] with permission from Elsevier) Fig. 12 SEM images of the XRD residue of the MW-8 h (a) and of the similar as-prepared sample (b) (Reprinted from [131] with permission from Elsevier) The thermal stability of the synthesized nanotubes was confirmed by in situ XRD measurements presented in Fig.

77] have established they are similar. In order to bring more information on the influence of the anatase and rutile on the TiNTs formation, their dissolution in concentrate hydroxides was studied. A fast dissolution with zero-order kinetics was established for anatase, while a slow dissolution with a second-order kinetics was determined for rutile [81]. The effect of the morphology (particle size and specific surface area) of the precursors on the TiNTs formation was also approached. Zhang et al.

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