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

ISBN-10: 3319329863

ISBN-13: 9783319329864

ISBN-10: 331932988X

ISBN-13: 9783319329888

This booklet offers rainy chemical sol-gel and hydrothermal equipment for 1D oxide nanostructure coaching. those tools symbolize an enticing path to multifunctional nanomaterials synthesis, as they're flexible, low-cost and, hence, applicable for acquiring quite a lot of oxide fabrics with adapted morphology and homes. 3 particular oxides (SiO2, TiO2, ZnO) are mentioned intimately that allows you to illustrate the main of the sol-gel and hydrothermal practise of 1D oxide nanostructures. different oxides synthesized through this technique also are in short awarded.

Throughout the ebook, the correlation among the tubular constitution and the physico-chemical homes of those fabrics is highlighted. 1D oxide nanostructures show fascinating optical and electric houses, as a result of their limited morphology. furthermore, a well-defined geometry will be linked to chemically lively species. for instance, the natural SiO2 nanotubes provided a mild photocatalytic job, whereas the Pt-doped SiO2 tubular fabrics act as microreactors in catalytic reactions. relating to titania and titanate nanotubes, huge particular floor region and pore quantity, ion-exchange skill, greater gentle absorption, and speedy electron-transport power have attracted major learn curiosity. The chemical and actual transformations (microwave assisted hydrothermal tools) mentioned the following enhance 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 numerous substrates. within the latter case a sol-gel layer is deposited at the substrate sooner than the hydrothermal practise. utilizing applicable dopants, coatings of ZnO nanorods with managed electric habit should be obtained.

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36] proposed another formation mechanism through recrystallization of the anatase crystallite into trititanate sheet, curving up of nanoloops resulted from trititanate sheets and the formation of nanotubes by oriented crystal growth supplied by TiO6 building block. The seed-formation-oriented crystal growth mechanism was regarded as most likely formation mechanism for nanotubes obtained under alkaline liquid phase hydrothermal conditions [38, 112, 113]. 4 3 Synthesis of Oxide Nanotubes/Nanorods by Hydrothermal Method Modifications of the Hydrothermal Treatment Although TiNTs with good morphology were obtained by hydrothermal method, they have rather low crystalline content.

The resulted TiNTs could aggregate to form thin rods. 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.

The shielding effect of K+ ions in solution on the negatively charged ZnO particles due to the presence of OHÀ groups at the crystal surface explaining the reduction of particle size when [Zn(II)] increases III. The formation of ZnxOy(OH)zÀ1(OK)m(z+2yÀ2xÀ1+m)À clusters IV. 0, the nanorods were formed in the 10–30 mM concentration range of Zn2+ and then spherical ZnO-NPs formed at 63 mM Zn2+; beyond the threshold concentration of 63 mM, the formation of longer nanorods is observed. The influence of the alkaline sources used for hydrothermal synthesis on the morphology of the obtained ZnO particles was studied by Lu et al.

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

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