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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Optimized Parameters for Functionalization of Silver Nanorod Array Substrates in Surface Enhanced Raman Spectroscopy (SERS)

등록일
2014년 9월 2일 15시 47분 21초
접수번호
1418
발표코드
PHYS.P-480 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
De Ranjit, 이창렬1, 신용석2, 오명규1,*
광주과학기술원(GIST) 고등광기술연구소, India
1광주과학기술원(GIST) 고등광기술연구소, Korea
2광주과학기술원(GIST) 고등광기술연구소 바이오광학, Korea
Oblique-angle-deposited Ag nanorod (AgNR) array which is uniform, reproducible, containing large SERS-active area, and capable of high Raman signal enhancement has been successfully fabricated as SERS substrate. Bare surfaces of metal and metal oxides have the tendency to adsorb adventitious organic materials readily altering the interfacial properties; it can also play significant influence on the stability of metal nanostructures. Taking these advantages into consideration, the AgNR nanosubstrate was functionalized by organic thiols as the sulfur can form strong bond with silver. To form defect minimized self-assembled monolayers (SAMs) on the AgNR array surface, the condition parameters such as choice of solvent, concentration of thiol, incubation time, temperature, reaction in presence of inert gas, surface stability and uniformity, etc. were optimized. The characterization of nanorods before and after functionalization was done by field emission-scanning electron microscopy (FE-SEM) and found that the functionalization does not alter the morphology of the AgNR array. SERS spectra were also acquired. The functionalized AgNR nanosubstrate has shown to be an excellent SERS substrate with an enhancement factor of ~ 108. Electromagnetic as well as chemical effect contributes to the total enhancement factor. The contribution of chemical effect to the total enhancement factor has been studied using spacer layer in between AgNR surface and SAM. Advantages of SAM are discussed in the light of wettability, corrosion resistance, and molecule detection.

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