inalladsorptionsteps,andthreewaterwashingstepsfor1minwereperformed after deposition of each layer. Subsequent (PEI/PSS/PAH/PSS)/Au NP layers were deposited in identical fashion. The same procedure and conditions were usedforthedepositionofthePE/CdTeNPlayers,withtheexceptionthatPEI/ PSS/PAHinterlayerswereusedbetweeneachCdTeNPlayer.Thatis,theCdTe NPswereadsorbedinalternationwithPAH/PSS/PAHforpreparing(PE 3 /CdTe NP) 3 and (PE 3 /CdTe NP) 6 samples. As for the PE NTs, the top and bottom coatingsonthePCmembraneswerewipedawaywithfilterpaper.Thecompos- iteNTswerethenreleasedbydissolvingthePCmembraneindichloromethane, andtheNTdispersionsobtainedwerefinallypurifiedbyseveraldichlorometh- anewashingsandcentrifugationcycles,followedbyredispersioninwater. Characterization: SEM images were recorded with a JEOL (JSEM 6330 F) instrument operated at an acceleration voltage of 5 kV. SEM samples were sputter-coated with Pt. 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[1,2] This has been led by two main factors. Firstly, mesoporous materials are unique in thattheyofferasubstratethatcombinesthefavorableproper- ties of crystalline microporous materials (zeolites) with those ofamorphoussilica.Indeed,thesematerialspossessanintrin- sicorderedporosity(withnarrowporesizedistributions)that can be easily tuned, which results in exceedingly high surface areas (up to 1300 m 2 g ±1 have been measured). Secondly, the highlyorderedintraporousspaceofthesematerialsimposesa stabilizing environment that can be readily modified. Pore confinement implies that a stabilizing effect exists since the reactive sites are protected from deactivation and leaching effects(encapsulationphenomenon).Theimmobilizedorgan- ometallic species display structural integrity, even under sin- COMMUNICATIONS Adv. Mater. 2003, 15,No.21,November4 DOI: 10.1002/adma.200305350 Ó 2003WILEY-VCHVerlagGmbH&Co.KGaA,Weinheim 1853 ± [*] Dr. D. Khushalani SchoolofPhysicalSciences UniversityofKentatCanterbury CT27NRKent(UK) E-mail:D.Khushalani@ukc.ac.uk Dr.S.Hermans, [+] Dr.C.M.G.Judkins,Prof.B.F.G.Johnson DepartmentofChemistry,UniversityofCambridge LensfieldRoad,CB2IEWCambridge(UK) S. Sadasivan,Prof. S. Mann SchoolofChemistry,UniversityofBristol BS81TSBristol(UK) [+] Current address: UniversitØ Catholique de Louvain, UnitØ CMAT, Place LouisPasteur1bte3,B-1348Louvain-La-Neuve,Belgium. [**] We acknowledge the University of Bristol for an ORS award for SS, NewnhamCollege,Cambridge,foraResearchFellowshiptoSH,andthe EPSRCandICIforfundingforCMGJ.