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In this work, CuFe2O4 nanospheres with hierarchically porous structure have been synthesized via a facile solvothermal procedure. The superstructures consist of the textured aggregations of nanocrystals with high specific surface area, pore volume, and uniform pore size distribution.To figure out the formation mechanism, we discussed in detail the effects of a series of experimental parameters, including the concentrations of the precipitation agent, stabilizer agent, and reaction temperature and time on the size and morphology of the resulting products. Furthermore, the electrochemical properties of CuFe2O4 nanospheres were evaluated by cyclic voltammetry and galvanostatic charge-dischrge studies. The results demonstrate that the as-prepared CuFe2O4 nanospheres are excellent electrode material in supercapacitor with high specific capacitance and good retention. The hierarchically CuFe2O4 nanospheres show the highest capacitance of 334F/g, and 88% of which can still be maintained after 600 charge-discharge cycles.

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Crystalline silver nanowires, with diameters of 50−500 nm and lengths up to tens of micrometers, have been successfully synthesized by a simple wet chemical route by using cuprous oxide nanospheres as a reductant and directional agent. The products are characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and UV−vis absorption spectroscopy. The two-dimensional netlike nanostructure is composed of several silver nanowires. The possible mechanism for the formation of silver nanowires is discussed. It is found that the architecture of silver crystals is drastically influenced by the concentration of the precursors and the reaction temperature. The experimental results reveal that the Cu 2 O nanospheres might play the two roles during the growth process of silver nanowires. Except for a reducing agent, Cu 2 O nanospheres act as a growth substrate to induce the formation of silver nanowires and a two-dimensional netlike nanostructure. Furthermore, the obtained two-dimensional netlike silver nanostructure can be used as surface-enhanced Raman scattering (SERS) substrates with high SERS activity and stability for detecting Rhodamine 6G (R6G) molecules. The analytical enhancement factor on the two-dimensional netlike silver nanostructure substrate is about 8 × 10 10 . Compared with other morphologies of silver substrates, it is found that the twodimensional netlike silver nanowires exhibit the highest SERS sensitivity. Hence, SERS substrates of the two-dimensional netlike silver nanowires described in this work have potential applications in chemical and biological analysis as well as medical detection.

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