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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Plasmon-Driven Decarboxylation Reaction of 4-Mercaptobenzoic Acid in Nanogaps

2018년 8월 30일 16시 44분 34초
PHYS.P-325 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Trinh Duc Hoa, Sangwoon Yoon1,*
Chemistry, Chung-Ang University, Korea
1Department of Chemistry, Chung-Ang University, Korea
Surface plasmon resonance (SPR) of noble metal nanoparticles has attracted considerable attention because of their wide range applications. Surface plasmons decay through either radiative or nonradiative pathways, where localized surface plasmon resonance (LSPR) can produce a huge electromagnetic field to get greatly enhanced Raman signal, the nonradiative relaxation pathway generates hot charge carriers and/or localized heating around nanoparticles which play a significant role in the plasmon-driven reactions. By using a easy fabricated nanoparticle-on-mirror (NPoM) system by adsorbing gold nanoparticles (AuNPs) on self-assembled monolayers (SAMs) on Au substrates, we study the mechanism of the plasmon-driven decarboxylation reaction of 4-mercaptobenzoic acid (MBA) in nanogaps. The reaction is monitored in situ by the SERS of molecules from these nanogaps which provides information with high sensitive. We discover that excitation of the coupled plasmon modes generates hot charge carriers in AuNPs . Interaction of hot charge carriers with carboxylate anion and proton at the surface of AuNPs leads to the formation of carboxylate and hydrogen radicals. This plasmon-driven process is unequivocally corroborated by dependence of reaction rate on the excitation wavelengths. Blocking the transport of hot charge carriers inhibits the reaction. The carboxy radical undergoes the homolytic cleavage process in the MBA, leading to the formation of BT and carbon dioxide products.