Highly Raman-Enhancing Substrates Based on Silver Nanoparticle Arrays

鑲嵌於氧化鋁奈米孔洞薄膜表面上的銀奈米粒子陣列基版，其銀粒子表面有特別強的表面加強式拉曼光譜效應，靠著首次能精準的將銀奈米顆粒間距控制於10奈米以下,發現表面加強式拉曼光譜的強度隨著顆粒間距縮小而快速的增加。這樣的結果在定量上提供表面加強式拉曼散射和粒子間電場耦合所引發的拉曼光譜加強效應的實驗證據。這種有表面加強式拉曼光譜效應的銀/氧化鋁基板,因為其加強效應有很高的均勻度和很好的實驗再現性，使其很適合使用於和表面加強式拉曼光譜效應有關的化學、生物等之實驗和應用。Substrates with extremely high surface-enhanced Raman scattering (SERS) activity are fabricated based on arrays of Ag-nanoparticles on the surface of anodic aluminum oxide (AAO) film. The gaps between the Ag-nanoparticles are precisely varied in the unprecedented sub-10-nm scale and the SERS enhancing power increases dramatically with the narrowing of the gaps. The results provide quantitative evidence of collective SERS effect and confirm predictions of interparticle-coupling induced Raman enhancement. The Ag/AAO substrate’s uniform and highly reproducible SERS-active properties as well as its wide dynamical range facilitate the use of SERS for many chemical/biological sensing applications.Contents Chapter 1 Introduction 1.1 Motivation 2 1.2 Anodic aluminum oxide (AAO) 5 Chapter 2 Experiment process and result 2.1 Ag/AAO substrate preparation 7 2.2 SERS spectrum measurement 12 Chapter 3 Discussion 20 Chapter 4 Conclusion 22 Reference 2