Construction of highly ordered ZIF-8/Au nanocomposite structure arrays and application of surface-enhanced Raman spectroscopy
Ordered single-layer polystyrene(PS)microsphere arrays were fabricated by using the gas/liquid interface self-assembly method,and then employed as a template,single-layer hexagonal nonclose packed Au nanoparticle ar-rays were prepared by combining magnetron sputtering deposition method as well as heat treatment technology.Sub-sequently,highly ordered ZIF-8/Au composite nanostructure arrays were successfully obtained by using the hydro-thermal method.The growth mechanism of composite nanostructure arrays and the effects of reaction temperature as well as time on the microstructure and optical properties were explored.Moreover,the sensitivity and uniformity of surface-enhanced Raman scattering(SERS)signals obtained from Ag film-decorated nanostructure arrays were fur-ther investigated.The results indicated that when the hydrothermal reaction temperature increased from 25 to 100 ℃,the number and size of ZIF-8 nanoparticles gradually increased,and the surface plasmon resonance(SPR)and diffraction peaks both red-shifted.When the hydrothermal reaction time increased from 10 to 60 min,ZIF-8 nanoparticles appeared from selective growth around Au nanoparticles to spread throughout the material surface.After depositing a specific thickness of Ag film onto the obtained array surface,the detection limits of Raman sig-nals from both 4-aminothiophenol(4-ATP)and rhodamine 6G(R6G)probe molecules were 10-11 mol·L-1.The SERS peak intensity located at 1 430 cm-1(4-ATP)and 1 355 cm-1(R6G)showed a linear relationship with the concentra-tion of each molecular solution,and the correlation coefficients R2 were 0.980 1 and 0.984 4,respectively.The rela-tive standard deviation(RSD)was 8.86％by comparison to the peak intensity located at 1 430 cm-1 obtained from 4-ATP molecules(10-5 mol·L-1)measured at 10 randomly selected positions on the arrays.It indicated that ordered ZIF-8/Au composite nanostructure arrays as SERS enhanced substrate exhibited good stability and uniformity.
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