Spin coating, description

The rqjroducibility of polymer film formation is greatly improved by the spin coating technique where the polymer solution is applied by a microsyringe onto the center of a rapidly rotated disk electrode Rather thick films can be produced by repeated application of small volumes of stock solution. A thorough discussion and detailed experimental description of a reliable spin coating procedure was given recently... 

Spin coating demands that the substrate be flat, while plasma derived coatings can be applied to nonplanar surfaces (even spherical substrates) efficiently. A detailed description of the... 

In this work, a Phillips model catalyst was prepared by spin coating of a THF solution of Cr(acac)3 on an oxidized silicon wafer. This study was mostly focused on a molecular description of the activation process in conditions similar to those used for industrial catalysts. This model catalyst was characterized by means of SEM, ToF-SIMS and XPS, and tested for ethylene pofymerization. 

Time-resolved PL measurements were also performed using time-correlated single-photon counting (TCSPC) and photoluminescence upconversion (PLUC) spectroscopies. Descriptions of the setups can be found in refs. [14, 65], respectively. All measurements were taken in continuous-flow He cryostats (Oxford Instruments OptistatCF) under inert conditions. Finally, PL efficiency measurements were performed on simple polymer thin films spin coated on Spectrosil substrates using an integrating sphere coupled to an Oriel InstaSpec IV spectrograph and excitation with the same Ar+ laser as above. 

The photoinduction of optical anisotropy has been studied in a number of the supramolecular systems, as discussed in the previous part of the chapter. On the contrary, the choice of the supramolecular systems, in which the formation of SRG has been reported, is rather restricted. One of the reasons can be a prevailing opinion that the covalent bonding of azobenzene to polymer chain is a necessary condition for the effective light-induced mass transport. First attempts to inscribe SRG in the supramolecular system were performed on LbL films (see description of the LbL system in the previous part of this chapter), but the obtained gratings were not very deep. Although the applicability of the approach has been principally demonstrated, the obtained results rather supported the current opinion that the mass transport may be effective only in the covalently bound materials. That is why the very effective inscription of SRG in the spin-coated... 

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