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Copper (II) adsorbed on SiO(2)/SnO(2) obtained by the sol-gel processing method: application as electrochemical
Lincoln A Kurihara1, Sergio T Fujiwara, Rení V S Alfaya
1Instituto de Química, Unicamp, CP 6154, 13083-970 Campinas, SP, Brazil.
Journal of Colloid and Interface Science
|May 18, 2004
Summary
A novel SiO(2)/SnO(2) mixed oxide was synthesized for enhanced conductivity. This material supports electroactive species and enables electrochemical detection of vitamin C.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Development of advanced materials with improved conductive properties is crucial for electrochemical applications.
- Supports for electroactive species require high surface area and chemical stability.
- Mixed oxides offer tunable properties for specific functionalities.
Purpose of the Study:
- To prepare a SiO(2)/SnO(2) mixed oxide with superior conductive properties.
- To utilize this material as a support for electroactive species.
- To develop an electrode for electrochemical vitamin C detection.
Main Methods:
- Sol-gel processing using tetraethylorthosilicate and SnI(4) precursors.
- Characterization of the mixed oxide's surface area, pore volume, and pore diameter (S(BET), V(p), D(p)).
- Thermal stability assessment using X-ray photoelectron spectroscopy and chemical stability of Brønsted acid sites.
Main Results:
- SiO(2)/SnO(2) with high surface area (525 m(2)g(-1)) and specific pore characteristics was obtained.
- The mixed oxide exhibited excellent thermal stability up to 1073 K and chemical stability of acid sites up to 473 K.
- Successful immobilization of Cu(II) onto the porous matrix for electrode development.
Conclusions:
- The synthesized SiO(2)/SnO(2) mixed oxide is a promising material for electrochemical applications.
- The material's properties make it suitable as a support for electroactive species.
- An effective electrode for vitamin C detection in tablets was developed using this novel matrix.