Intercalative Route to Heterostructured Nanohybirds
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Intercalative Route to Heterostructured Nanohybirds Jin-Ho Choy National Nanohybrid Materials Laboratory School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-747, KOREA ABSTRACT We have successfully synthesized organic-inorganic and bio-inorganic nanohybrids by applying an intercalation technique systematically to Bi-based cuprate superconductors, Bi2Sr2Cam-1CumOy (m = 1, 2, and 3; BSCCO), and to layered double hydroxides(LDHs), those which are of high importance in terms of basic understanding of intercalation reactions and of their practical applications. The organic-inorganic hybrids were achieved via intercalative complexation of iodine intercalated BSCOO with organic salt of Py-CnH2n+1I (Py = pyridine). The high-Tc superconducting intercalate with its remarkable lattice expansion can be applied as a precursor for superconducting colloids when dispersed in an appropriate solvent. We were also able to demonstrate that the biomolecules stabilized in the interlayer space of LDH retain their chemical and biological integrity. If necessary, LDH, as a reservoir, can be intentionally removed by dissolving it in an acidic media or interlayer biomolecules in LDH can be released via ionexchange reaction in electrolyte. It is, therefore, concluded that the inorganic LDH can play a role as a good host lattice for gene reservoir or carrier. INTRODUCTION Recently, inorganic/inorganic[1], organic/inorganic[2], and bio-inorganic[3] heterostructured nanohybrids have attracted considerable research interests, due to their unusual physicochemical properties, which cannot be achieved by conventional solid state reactions. In order to develop new hybrid materials, various synthetic approaches, such as vacuum deposition, LangmuirBlodgett technique, self-assembly, and intercalation method have been explored. Among them, the intercalation reaction techniquethat is, the reversible insertion of guest species into twodimensional host latticeis expected to be one of the most effective tools for preparing new layered heterostructures because this process can provide a soft chemical way of hybridizing inorganic/inorganic, organic/inorganic, and biological/inorganic compounds. This field appears to be very creative giving the opportunity to invent an almost unlimited set of new compounds (hybrid compounds) with a large spectrum of known or unknown properties. As a consequence of the dual functionality of hybrid materials, this area is also a good field for scouting smart materials. For example, we were able to realize a new inorganic/organic hybrid system with high-Tc superconducting properties. It is well known that the intercalation reaction occurs in V11.1.1
highly anisotropic lamellar structures in which the interlayer binding forces are fairly weak, compared with the strong ionocovalent intralayer ones. The control of the strength of interlayer interactions makes it possible to probe the relation between interlayer coupling and superconductivity. The layered double hydroxides (LDHs), so-called “anionic
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