600 Technik, Medizin, angewandte Wissenschaften
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The wet chemical deposition of solution processed transparent conducting oxides (TCO) provides an alternative low cost and economical deposition technique to realize large-areas of conducting films. Since the price for the most common TCO Indium Tin Oxide rises enormously, Aluminum Zinc Oxide (AZO) as alternative TCO reaches more and more interest. The optoelectronical properties of nanoparticle coatings strongly depend beneath the porosity of the coating on the shape and size of the used particles. By using bigger or rod-shaped particles it is possible to minimize the amount of grain boundaries resulting in an improvement of the electrical properties, whereas particles bigger than 100 nm should not be used if highly transparent coatings are necessary as these big particles scatter the visible light and lower the transmittance of the coatings. In this work we present a simple method to synthesize AZO particles with different shape and size, but comparable electronical properties. We use a simple, well reproducible polyol method for synthesis and influence the shape and size of the particles by adding different amounts of water to the precursor solution. We can show that the addition of aluminum as dopant strongly hinders the crystal growth but the addition of water counteracts this, so that both, spherical and rod-shaped particles can be obtained.
Die Übertragung von Strukturen und Funktionen aus der Biologie in technische Produkte, Bionik, erfährt in den letzten Jahren zunehmendes Interesse. Die meisten Lebewesen sind aus faserverstärkten Strukturmaterialien aufgebaut und eignen sich daher hervorragend als Ideengeber für die Entwicklung innovativer bionischer Produkte unter Verwendung von technischen Textilien bzw. Faserverbundmaterialien. Dies wird am Beispiel verzweigter und unverzweigter Faserverbundstrukturen und von bionischen Fassadenverschattungssystemen exemplarisch gezeigt.