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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 The role of electrophilicity with substituted para-thiophenols in Surface-Enhanced Raman Scattering

2018년 8월 22일 09시 23분 54초
ANAL.P-349 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 19일 (금요일) 11:00~12:30
포스터 분석구두발표
Analytical Chemistry
저자 및
Minjung Seo, Ji Won Ha*
Department of Chemistry, University of Ulsan, Korea
Surface-Enhanced Raman Scattering (SERS) is considered an important analytical technique that has two main mechanisms : the electromagnetic effect related with the localized surface plasmon resonance (LSPR) of nanoparticles and the chemical effect connected with charge-transfer between nanoparticles and probe molecules. In chemical effect, the probe molecules play an main role via the chemical bonding with nanoparticles and there is much potential to find unrevealed regions to elucidate SERS mechanism completely. To understand the relationship between the electrophilicity of molecules and SERS enhancement focused on the chemical effect, para-substituted thiophenols derivatives with strong gold-sulfur interaction and gold nanorods (AuNRs) on resonance condition are chosen. We study SERS behaviors following the electrophilicity of substituent, such as electron withdrawing group (EWG) and electron donating group (EDG), in self-assembly monolayers (SAMs) system and reveal that stronger EWG groups show higher enhancement supporting our assumption that EWG propably promotes a charge-transfer in SERS.