| Noble metal meterials showed the unique physical and chemical properties,especially excellent optical performance.They could be processed into array structure with control of size and distribution.The optical absorbtion and Raman enhancement had obvious reeforcement,which led to high application value.However,there were still some problems in the research of the noble metal array,including complicated preparation,high cost and large size of arrays.Thus,how to prepare efficient noble metal arrays by simple method has far-reaching significance.In this paper,a new micro-fabrication method was developed to prepare gold and silver noble metal micro-arrays,combining electrochemical reaction and self-assembly technology.The optical properties of these micro-arrays were also studied.The main content of this paper was listed as follows:1.The materials was prepared by a new micro-fabrication method.The chemical reaction synthesis was processed by using four Zirconium butanol as precursor and benzoyl acetone as chemical modifier.The high resolution of photosensitive sol ZrO2was synthesised by sol-gel method.The absorption and light decomposition characteristics of ZrAO2 membrane were further studied by UV-Visible spectrophotomer.The pattern arrays with radius of 4?m and 2?m are prepared by mask lithography with the help of the UV photosensitive properties.In the meanwhile,1?m sub-micron array pattern was prepared by the dual beam laser interference technique.2.The silver nanoparticles were fabricated on array pattern through the electrochemical reduction method after the heat treatment.The growth procedure of silver nanoparticle was regulated by changing the reaction voltage,reaction time,or adding different additives.The silver nanoparticle arrays were used as substrate for detecting the Raman intensity of Rhodamine 6G.The study found that when the applied voltage of 25V and the reaction time of 30min,the susbtrate of the uniform silver dendritic arrays showed the strongest SERS for detecting the Rhodamine 6G.At the same time,the additive KH550,PVP,TSC had different influences on the growth of silver.The addictive KH550 linked silver ions in the solution,which increased the reduction number of silver atoms,leading to the enhancement of electromagnetic field which improved the Raman signal.The PVP and TSC were absorbed on the specific crystal orientation of the silver atoms,affecting the morphology of silver atoms,enhancing the Raman performance of silver pattern arrays.The experimental results showed that under the optimal reaction condition,the silver arrays as Raman substrate reached the detection limit of 10-13M for detecting the Rhodamine 6G.3.The gold fabricated by plasma sputtering and silver prepared by electrochemical reaction were combined to gain Au-Ag nano-arrays.The rate of gold atoms in the composite materials was adjusted by controlling the sputtering time.The experiment showed a certain amount of gold atoms will promote the Raman signal while the light scattering would happen if there were too much gold atoms.The golden rods were absorbed in the Ag pattern arrays when energized the voltage to obtain the Au-Ag composite materials.With certain concentration of gold rods solution for electricity,the gold rods were irritated to directional absorb on the silver dendritic substrate.The study found that Au-Ag composite materials greatly broadened the absorption peak and enhanced the Raman signal in contrast to the separate Au or Ag substrate.In other words,Au-Ag composite materials has much more excellent performance and more extensitive application value than separate Au or Ag in the optical field,especially for the Surface-enhanced Raman scattering and absorption application. |
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