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  • 02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내 High SERS-activity in Films of Ag Nanorod?Nanoparticle Assembly Structure

2015년 2월 26일 14시 39분 07초
PHYS.P-475 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 15일 (수요일) 16:00~19:00
저자 및
De Ranjit, 오명규*
광주과학기술원(GIST) 고등광기술연구소, Korea
Silver nanorod-nanoparticle assembly structures were fabricated and their morphological and optical properties were investigated for applications in surface-enhanced Raman spectroscopy (SERS). For the fabrication of the nano-assembly structure, silver nanorod (AgNR) arrays, fabricated via oblique-angle deposition by thermal evaporation, were functionalized by (alpha,omega)-alkanedithiols to which silver nanoparticles (AgNPs) were linked. The morphology of this conjugated system and its SERS-activity were characterized by scanning electron microscopy (SEM) and micro-Raman spectroscopy followed by benzenethiol-functionalization, respectively. Typical values of the diameter and length of the AgNRs are ~70 nm and ~900 nm, respectively. And, the average diameter of the AgNPs was ~ 70 nm. Population densities of these AgNPs linked to AgNR arrays were found to vary between 20 and 130 per ?m^2 with the variation of dithiol chain lengths, where the dithiol with smallest chain length is found to link higher number of AgNPs; the reason behind this behavior was explored. From the SERS characterization, very significant increase in the enhancement factor (E.F.) of the Ag NR-NP assembly film was observed over that of bare AgNR array, to which ‘hot spots’ generated at the NR-NP junctures are attributed. This hot spot effect in the aforementioned assembly structure is unique since it elevates the overall E.F. by > 5 times from the huge value (~10^8) of bare AgNR array. This conjugated nano-assembly structure film was found to be reproducible and will pave the way for high sensitive analyte detection, where the hydrophobic interaction with the alkane chains of dithiols located at the ‘hot spots’ between AgNR and AgNP will play an important role.