Thin film multilayer systems position

Fabrication of organic thin films based on sponfaneous molecular assembly has been considered as one of fhe powerful approaches to create novel supramolecular systems. In this context, multilayer films were fabricated by layer-by-layer electrostatic deposition techniques based on the electrostatic interaction between dsDNA and the positively charged polymer poly(diallyldimethylammonium chloride) (PDDA) on GC surfaces. A uniform assembly of PDDA/DNA multilayer films was achieved, based on the adsorption of the negatively charged DNA molecules on the positively charged substrate [55]. 

Total reflection (or reflectance) XRF (TXRF) is a technique that looks at thin film samples or thin-layer samples with the ability to detect elements from Na to U. A schematic TXRF spectrometer and a commercial system can be seen in Figure 8.17a and b. The Bruker S2 PICOFOX consists of an air-cooled Mo anode metal-ceramic X-ray tube, a multilayer monochromator, and an XFlash SDD and can be equipped with a 25 position autosampler. 

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