在室温下,采用电沉积的方法结合溶致液晶软模板辅助银离子自组装协同生长效应,在ITO玻璃基板上制备了花形银微纳米颗粒,通过调节电沉积直流电压大小实现了对花形银微纳米颗粒的可控制备。利用扫描电子显微镜、X射线衍射和X射线能谱等技术对材料的表面形貌、晶格结构、成分进行表征。实验结果表明,当直流电压值小于8 V时,随着电压增加,银颗粒片状结构数目增加、表面“热点”数目增多;当直流电压值大于8 V后,片状结构更趋于细化并倾向于沿着基板表面向更远处延伸生长。以罗丹明6G作为拉曼探针,对不同条件下制备的样品拉曼增强效果进行测试,结果表明,电压为8 V时制备的样品拉曼增强效果最佳,增强因子可达107量级。样品良好的拉曼增强性能以及成本低廉、简单的制备过程表明,该方法制备的表面增强拉曼基底具有潜在的应用前景,此研究为其进一步的实用化应用奠定了基础。
Abstract
Flower-like silver nanoparticles were prepared on ITO glass substrate by electrodeposition combined with lyotropic liquid crystal soft template assisted silver ion self-assembly synergistic growth effect at room temperature. The controllable preparation of flower-like silver nanoparticles was realized by adjusting the DC voltage of electrodeposition. Scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy were used to characterize the surface morphology, lattice structure and composition of the material. The experimental results show that when the DC voltage is less than 8 V, the number of flake structure and the number of "hot spots" on the surface of silver particles increase with the increase of voltage; when the DC voltage is greater than 8 V, the flake structure tends to be more refined and tends to grow along the substrate surface. Rhodamine 6G was used as a Raman probe to test the Raman enhancement effect of samples prepared under different conditions. The results show that the Raman enhancement effect of samples grown under 8 V voltage is the best, and the enhancement factor can reach 107 order. The sample has good Raman enhancement performance, low cost and simple preparation process, which indicates that the surface enhanced Raman substrate prepared by the modified method has potential application prospects. This study lays the foundation for its further practical application.
关键词
花形银微纳米结构 /
表面增强拉曼散射 /
电沉积 /
溶致液晶模板
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Key words
flower-like silver micro-nanostructures /
surface enhanced Raman scattering /
electrodeposition /
lyotropic liquid crystal template
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脚注
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基金
中国民航大学大学生创新创业训练计划项目(201910059065);中央高校基本科研业务费项目中国民航大学专项(3122019150)
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