Symmetrical thiol functionalized polyhedral oligomeric silsesquioxanes as building blocks for LB films.

Citation:

Shlomit Kraus-Ophir, Jerman, Ivan , Orel, Boris , and Mandler, Daniel. . 2011. “Symmetrical Thiol Functionalized Polyhedral Oligomeric Silsesquioxanes As Building Blocks For Lb Films.”. Soft Mattersoft Matter, 7, Pp. 8862 - 8869.

Abstract:

The Langmuir-Blodgett (LB) method was used for depositing cubic polyhedral oligomeric silsesquioxanes (T8POSS) onto Au, indium tin oxide (ITO) and mica supports. Three different T8POSS were examd.; two were amphiphilic and aggregated upon transfer to a solid support, while the highly sym. POSS (termed MP8) gave stable and reproducible Langmuir films as studied by surface pressure and transfer ratio measurements. This was attributed to the eight identical alkanethiol groups located on each of the eight corners of the cubic like skeleton. The LB films were studied by RA-FTIR, XPS, contact angle and cyclic voltammetry. These techniques revealed the formation of a permeable, yet, stable layer. The sym. MP8 was utilized as a bridging building block between the support and Au nanoparticles (Au-NPs). This assembly was examd. by means of AFM, SEM and anodic oxidn. of the nanoparticles. An av. d. of 1.45 × 109 nanoparticles cm-2 was obtained for the deposited Au-NPs on the MP8 layer. Furthermore, anodic stripping voltammetry was used for studying the extn. of Hg2+ by the MP8 LB film. [on SciFinder(R)]