Intercalation route to nano-hybrids:: inorganic/organic-high Tc cuprate hybrid materials

被引:40
作者
Choy, JH [1 ]
Kwon, SJ [1 ]
Hwang, SJ [1 ]
Kim, YI [1 ]
Lee, W [1 ]
机构
[1] Seoul Natl Univ, Coll Nat Sci, Dept Chem, Ctr Mol Catalysis, Seoul 151742, South Korea
关键词
D O I
10.1039/a805869e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A systematic application of intercalation techniques to layered superconducting oxides enables us to open a new chapter in the development of nano-hybrids with various functions. Recently we were successful in preparing a new series of inorganic-inorganic nano-hybrids, M-X-Bi2Sr2Cam-1CumOy (M = Hg, Ag, Au; X = Br, I; m = 1-3) and organic-inorganic ones, R2HgI4-Bi2Sr2Cam-1CumOy (R = organic cation). Our synthetic strategies are based on (1) HSAB (hard-soft acid-base) interactions and (2) interlayer complexation concepts. Since the iodine species in IBi2Sr2Cam-1CumOy are stabilized as I-3(-) (soft base) with a charge transfer between;host and guest, soft Lewis acids like Ag+, Au+, and Hg2+ can be further intercalated into the iodine layers in between the (Bi-O) double layers. On the other hand, new organic-inorganic nano-hybrids (R2HgI4-Bi2Sr2Cam-1CumOy) have also been achieved through the intercalative complex-salt formation reaction between preintercalated HgI2 molecules and R+I- salts in the interlayer space of Bi2Sr2Cam-1CumOy. Compared to the pure compounds the superconducting transition temperatures of the organic-salt intercalates are little changed even with a large basal increment upon intercalation, indicating a two-dimensional nature of the high-ir, superconductivity. From the viewpoint of application, the intercalation of large organic molecules provides a new synthetic route to high-T-c superconducting thin-film and nano-particles by separating superconducting blocks into isolated single sheets.
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页码:129 / 135
页数:7
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