By Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria Zaharescu
This publication offers rainy chemical sol-gel and hydrothermal tools for 1D oxide nanostructure instruction. those equipment signify an enticing path to multifunctional nanomaterials synthesis, as they're flexible, low-cost and, therefore, acceptable for acquiring a variety of oxide fabrics with adapted morphology and homes. 3 particular oxides (SiO2, TiO2, ZnO) are mentioned intimately so one can illustrate the main of the sol-gel and hydrothermal guidance of 1D oxide nanostructures. different oxides synthesized through this system also are in brief offered.
Throughout the booklet, the correlation among the tubular constitution and the physico-chemical houses of those fabrics is highlighted. 1D oxide nanostructures express attention-grabbing optical and electric houses, because of their restrained morphology. additionally, a well-defined geometry will be linked to chemically lively species. for instance, the natural SiO2 nanotubes offered a moderate photocatalytic job, whereas the Pt-doped SiO2 tubular fabrics act as microreactors in catalytic reactions. when it comes to titania and titanate nanotubes, huge particular floor region and pore quantity, ion-exchange skill, more suitable gentle absorption, and quick electron-transport strength have attracted major examine curiosity. The chemical and actual differences (microwave assisted hydrothermal tools) mentioned right here 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 various 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 may be obtained.
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Extra resources for 1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods
Sol. 7 nm (almost twice the value of anatase lattice parameter) and that the total number of the layers is not equal on both sides of the tubes, indicating that the structure of the tubes is formed by curling up the sheet structures [37, 42]. According to the literature data, for the time being the most widely accepted mechanism of TiNTs formation during the hydrothermal process involves four stages [23, 37, 42, 43, 101, 108–110]: 1. Dissolution of the TiO2 precursor and breaking the Ti–O–Ti bonds in the concentrated NaOH solution 2.
The reconstruction of ZnO nanostructures from cumulates of nanoparticles by increasing reaction time and self-organization of fast-growing crystallographic plane may yield ZnO nanowires . The transformation of ZnO morphologies by in situ thermohydrolysis technique using zinc nitrate–hexamethylenetetramine is studied with and without surfactants. In the absence of any surfactants, the HMTA-assisted in situ hydrolysis resulted in microtube and multipod morphologies . ZnO micro- and nanorods with hexagonal structure were synthesized by the hydrothermal solution technique using zinc nitrate–hexamethylenetetramine.
However, according to the literature data , at least three processes occur with titanate nanotubes at higher temperature (300–600 C), namely, dehydroxylation, crystal structure transformation, and a modification in morphology. All three processes take place simultaneously, and each has a characteristic range of temperatures related to their particular phase transition. The similar thermal behavior in this temperature range, in which no specific thermal effects were noticed in the DTA/TGA curves (Fig.
1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods by Crina Anastasescu, Susana Mihaiu, Silviu Preda, Maria Zaharescu