By Pelagia-Irene Gouma

A consultant to the interdisciplinary fields of nanomaterials, sensors, and biotechnology, this booklet demonstrates practical purposes of nanotechnology in varied parts comparable to environmental sensing and house habitation, clinical diagnostics, and tissue regeneration. With a spotlight on novel fabrics synthesis, reminiscent of utilizing the nanomanufacturing means of electrospinning to get the longest nanowires attainable, a correlation is made from the impression of chemical, structural, and morphological beneficial properties to accomplish severe fabrics performance. This e-book serves as a handbook to nanotechnology for newcomers and specialists alike, from the fabrics scientist to the biophysicist, bioengineer, and scientific scientist.

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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 .

Up to 12 µm long aligned nanowires with a preferred c-axis orientation have been synthesized by this method. d. 2 Tin Oxide Nanostructures and their Applicability in Sensing Tin dioxide finds use in three major applications (a) as a transparent conductor — has high electrical conductivity and transparency in the visible range of the electromagnetic spectrum (b) as a catalyst in oxidation (c) as a solid state gas sensor. The latter two applications are controlled by the properties of the surface while transparency is more so a bulk property.

2004). Wan et al. (2004;c) in another set of experiments explain the formation and gas sensing characteristics of Cd doped ZnO to relative humidity. The nanowire network was synthesized by co-evaporating metallic Cd and Zn at 900◦C in a tube furnace under 95%Ar and 5% O2 . The nanowires/belts had a narrow diameter distribution range and were about 2 µm in length. The sensor fabricated from the Cd-doped nanowires was tested for its sensitivity towards relative humidity (RH). The sensor demonstrated a three fold change in resistance at about 95% RH.

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