| 초록 |
Yolk-shell structured Ni-doped silica with high specific surface area and excellent thermal stability was synthesized via a simple surfactant assisted sol-gel mediated hydrothermal method using hexadecyltrimethylammonium bromide (CTAB) as a structure-directing agent in water-ethanol mixed solvent. After calcining off the organic surfactant, the resulting material shows crystallinity in powder X-ray diffraction (XRD) analysis with formation of nickel hydrosilicate phase, Ni3Si2O5(OH)4. The mesoporosity, nanostructure and morphology of the material were confirmed by N2 sorption, transmission (TEM) and field-emission scanning electron microscopic (FESEM) analysis, respectively. Ni-silica yolk-shell nanostructure with around 30 wt% Ni has surface area ca. 500 m2/g with pore width ca. 3.8 nm and 400–500 nm particle size. X-ray photoelectron spectroscopic (XPS) study has also been carried out to confirm the presence of Ni(II) species in the material. This yolk-shell Ni doped-silica mesostructure has been utilized successfully for non-enzymatic glucose detection at room temperature via electrochemical sensing of D-glucose analyte in 0.1 M NaOH solution. |
