Preparation of organic-inorganic hybrids possessing nanosheets with perovskite-related structures via exfoliation during a sol-gel process

Seiichi Tahara, Yosuke Takeda, Yoshiyuki Sugahara

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42 Citations (Scopus)

Abstract

Organic-inorganic hybrids containing exfoliated nanosheets with a perovskite-related structure have been prepared from an n-decoxy derivative of an ion-exchangeable layered perovskite, HLaNb2O7· xH2O (HLaNb) or HCa2Nb3O10· xH2O (HCaNb), silanol-terminated poly(dimethylsiloxane) (PDMS), and tetramethoxysilane (TMOS) via a sol-gel process involving the reaction of the n-decoxy derivative with a PDMS-TMOS mixture and subsequent intentional hydrolysis with hydrochloric acid. The X-ray diffraction (XRD) patterns of the resultant products after intentional hydrolysis indicate both preservation of the perovskite-like slab structure and disappearance of stacking order. Partial exfoliation of layered perovskites is correspondingly observed by transmission electron microscopy (TEM). The formation of a polysiloxane network composed of PDMS chains and Qn units ((RO)4-nSi(OSi)n: R = H, CH3) via intentional hydrolysis is shown by the solid-state 29Si CP/MAS (cross-polarization and magic angle spinning) NMR spectroscopy. These products are expected to possess the Nb-O-Si linkage interface since a signal assignable to the (SiO)Si(CH3) 2O-Nb environment is present in the 29Si CP/MAS NMR spectra of products prepared from an n-decoxy derivative of HLaNb (or HCaNb), PDMS, and TMOS in a similar manner without intentional hydrolysis and the Nb-O-Si bonds are expected to be preserved during hydrolysis. The exfoliated structures should be formed during the intentional hydrolysis process since the products prepared without intentional hydrolysis clearly exhibit a stacking order along the c axis.

Original languageEnglish
Pages (from-to)6198-6204
Number of pages7
JournalChemistry of Materials
Volume17
Issue number24
DOIs
Publication statusPublished - 2005 Nov 29

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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