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生物矿化与仿生材料Biomim12_SAM2.pptVIP

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生物矿化与仿生材料Biomim12_SAM2.ppt

Biomimetic Synthesis on SAMs (2) Last lecture: coherent CaCO3-films under Langmuir-films introduction to SAMs Today: ceramic films on SAMs observations mechanisms of film formation retrospection lectures Literature: ?Synthesis and characterization of TiO2 thin films on organic Self-Assembled Monolayers: Part I+II“, H.Shin, R.Collins, M.DeGuire, A.Heuer, C.Sukenik J.Mat.Res. 10 (1995) 692. ?Deposition of oxide thin films on silicon using organic Self-Assambled Monolayers“ M.DeGuire, H.Shin, R.Collins, M.Agarwahl, C.Sukenik, A.Heuer Proc.SPIE- Int.Soc.Opt.Eng. 2686 (1996) 88. ?Atomic force microscopic studies of oxide thin films on organic Self-Assebmled Monolayers“ T.Niesen, M.DeGuire, J.Bill, F.Aldinger, M.Rühle, A.Fischer, F.Jentoft, R.Schl?gl J.Mat.Res. 14 (1999) 2464. Questions Regarding Film Formation on SAMs Influence of different types of supersaturated Ti-solutions ? Details of film formation and microstructure of films ? Mechanism of film deposition ? Advantages/disadvantages of preparation technique ? Supersaturated Solutions based on Water and Alcohols as Solvents Aqueous solutions TiCl4 in 8-12M (!) HCl-solution Oxo-hydroxo complexes are formed upon increase of temperature to 80oC Alcohols Hydrolysis- and condensation-reactions of Ti-alkoxides ? sol-gel chemistry Results: Rate of Deposition of Films Aqueous TiCl4-solutions at high concentrations coherent nano-crystalline film with amorphous regions 2-4nm crystallites of anatase 50% shrinkage and grain growth at 600oC HR-TEM:Microstructure of TiO2-Films on SAMs TiO2-films on -SO3H- SAMs from aqueous solutions (80oC) epoxy-resin anatase-crystallites (2-4 nm) SAM (2,5 nm) + SiO2 (1,5 nm) Si-substrate CdS-Filme on SAMs (1) SAMs: Octadecylphosphon-acid on mica Solution: thermal decomposition of thiourea in the presence of Cd2+ a)8-10 min: flat CdS-deposits, height 8-12? b)1h: size of CdS-deposits has ingreased, some “overhanging” particles CdS-Films on SAMs (2) c) 3h surface covered with parti

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