By Pelagia-Irene Gouma
A advisor to the interdisciplinary fields of nanomaterials, sensors, and biotechnology, this booklet demonstrates sensible purposes of nanotechnology in various parts corresponding to environmental sensing and area habitation, clinical diagnostics, and tissue regeneration. With a spotlight on novel fabrics synthesis, resembling utilizing the nanomanufacturing means of electrospinning to get the longest nanowires attainable, a correlation is made from the impression of chemical, structural, and morphological positive factors to accomplish severe fabrics performance. This booklet serves as a guide to nanotechnology for beginners and specialists alike, from the fabrics scientist to the biophysicist, bioengineer, and scientific scientist.
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Nanostructured metal oxide fabrication 19 This process, as shown schematically in Fig. , 1993). The advantages of using a spray pyrolysis are as follows: III. Spray Pyrolysis • The process makes use of the wide variety of available solution chemistries compartmentalizing the solution in to unique droplets, thereby retaining very good stoichiometry on the particle surface. This is particularly useful for the synthesis of single and mixed metal oxides • A variety of particle morphologies can be obtained such as core-shell morphologies, porous particles for catalyst support, fibers, nanocomposites, quantum dots and hollow nanoparticles, to mention a few.
18 shows scanning electron micrographs of one-dimensional structures of WO3 synthesized by different routes. In the approach described by Parthangal et al. (2005) a previously deposited tungsten film is restructured in to nanowires by heating the substrate in an inert gas CVD chamber. Although the WO3 nanowires are non-stoichiometric good sensitivities to NO2 are obtained. Wet chemistry method employed by Polleux et al. (2006) has yielded porous nanobundles of WO3 nanofibers that exhibited excellent sensitivities down to ppb levels of NO2 .
In addition, adherence to the substrate and correct thermal shrinkage properties are necessary to obtain a good film. The advantages of using screen printing are that it is a very efficient way to produce cheap and robust chemical sensors. Also it offers excellent control over the obtainable thicknesses. 2 Unconventional Nanostructures Recently there have been a lot of reports of synthesis of 2D and 1D nanostructures such as nanowires, nanobelts, nanorods, nanodiskettes of metal oxides, with a large surface area to volume ratio, see Fig.
Nanomaterials for Chemical Sensors and Biotechnology by Pelagia-Irene Gouma