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- W2011014300 abstract "Successful synthesis of silica shells templated by polypeptide spheres stabilized by citric acid inspired us to explore the possibility of realizing aqueous self-assembly of metal oxides using the same template. As a specific case in the present study, we have begun with tin (IV) oxide. Initially, we failed to control the assembly process due to strong hydrolysis of Sn4+ ions and agglomeration of tin hydrates. After modification by a proper amount of citric acid which was trapped onto the surface of the tin hydrates through the chelating bond between RCOO− groups and Sn4+ ions, finely dispersed and stabilized tin oxide precursors have been obtained through electrostatic repulsion or/and steric hindrance. As a result, aqueous self-assembly of surface functional SnO2 building blocks mediated by the pre-formed polypeptide templates has been successfully achieved through interfacial columbic forces (COO−/NH3+). Samples fabricated from systematic processing control were characterized by thermogravimetric (TG) analysis, field-emission scanning electron microscopy (SEM), x-ray powder diffraction, high-resolution transmission electron microscopy (HRTEM), infrared (IR) absorption and N2 gas sorption experiments. Unique coral- and sea worm-like multilevel porous/hollow frameworks consisting of SnO2 nanocrystallites (4–5 nm) were synthesized. The samples also demonstrated improved H2 gas sensing property due to the large specific surface area (180–210 m2 g−1) as well as easy gas diffusion." @default.
- W2011014300 created "2016-06-24" @default.
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- W2011014300 date "2006-11-22" @default.
- W2011014300 modified "2023-10-09" @default.
- W2011014300 title "Hierarchical porous/hollow tin oxide nanostructures mediated by polypeptide: surface modification, characterization, formation mechanism and gas-sensing properties" @default.
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- W2011014300 doi "https://doi.org/10.1088/0957-4484/17/24/010" @default.
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