Metal Nanoclusters on Focused ion beam Fabricated Au Nanorod Array as a Double junction SERS-active substrate for Collagen Type-I Detection

• Main Authors: Chih-YuChang, 張志宇
• Other Authors: Jiunn-Der Liao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/80305762650523071266

碩士 === 國立成功大學 === 材料科學及工程學系 === 102 === Au or Ag nanoclusters (NCs) were sputtered on focused-ion-beam (FIB) fabricated Au nanorod (NR) array (fibAu_gNC and fibAu_sNC) to promote the effect of surface enhanced Raman scattering (SERS). The effect was estimated by crystal violet (CV) as the probe molecule and found to rely on the agglomerated thickness of NCs. A thin-layer deposition of Au or Ag on the top and side surfaces of NR was thereafter chosen. Furthermore examinations on 4-aminobenzenethiol and collagen type-I, mixing with AuNPs or AgNPs upon fibAu_sNC, showed that a strong electromagnetic field effect is presumably generated at the two hot-spot junctions, namely, NPs with NCs and NCs with NRs. Through this hybrid nanostructure system, trace detection at the single molecule level can be reached. In particular for the collagen type-I target, the quality of amino acids can also be detected. Based upon this preliminary study, a small gap at the NCs on NR interface may increase the localized EM field, while target species mixed with NPs place upon fibAu_sNC additionally increase the sensitivity and selectivity of SERS-active detection.