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Nanoscale Refractive Index Tuning of Siloxane‐Based Self‐Assembled Electro‐Optic Superlattices
Author(s) -
van der Boom M. E.,
Evmenenko G.,
Dutta P.,
Marks T. J.
Publication year - 2001
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/1616-3028(200110)11:5<393::aid-adfm393>3.0.co;2-s
Subject(s) - materials science , chromophore , superlattice , oxide , covalent bond , hyperpolarizability , self assembly , nanoscopic scale , siloxane , refractive index , chemical engineering , intercalation (chemistry) , high refractive index polymer , layer (electronics) , nanotechnology , optoelectronics , inorganic chemistry , organic chemistry , molecule , composite material , metallurgy , chemistry , polarizability , engineering , polymer
The refractive indices of self‐assembled organic electro‐optic superlattices can be tuned by intercalating high‐ Z optically transparent group 13 metal oxide sheets into the structures during the self‐assembly process. Microstructurally regular acentricity and sizable electro‐optic responses are retained in this straightforward synthetic procedure. This “one‐pot” all wet‐chemistry approach involves: i) layer‐by‐layer covalent self‐assembly of intrinsically acentric multilayers of high‐hyperpolarizability chromophores on inorganic oxide substrates, ii) protecting group cleavage to generate a large density of reactive surface hydroxyl sites, iii) self‐limiting capping of each chromophore layer with octachlorotrisiloxane, iv) deposition of metal oxide sheets derived from THF solutions of Ga(O i C 3 H 7 ) 3 or In(O i C 3 H 7 ) 3 , and v) covalent capping of the resulting superlattices.