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  • 03월 08일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제127회 대한화학회 학술발표회 및 총회 Tuning Chemical Interface Damping in Single Gold Nanorods

2021년 3월 8일 15시 03분 28초
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목 14시 : 30분
Analytical Chemistry - Convergence Analytical Chemistry for Disease Diagnosis
저자 및
Ji won Ha
Department of Chemistry, University of Ulsan, Korea

Recently, chemical interface damping (CID) has been proposed as a new plasmon damping pathway based on interfacial hot-electron transfer from metal to adsorbate molecules.[1] It has been considered essential, owing to its potential implications in efficient photochemical processes and sensing experiments. However, thus far, studies focusing on controlling CID in single gold nanoparticles have been very limited, and in situ reversible tuning has remained a considerable challenge. In this scanning electron microscopy-correlated dark-field (DF) scattering study, the CID was controlled by focusing on the electronic nature of disubstituted benzene rings acting as adsorbates, as well as the effects of sharp tips on gold bipyramids (AuBPs) with similar aspect ratios to those of gold nanorods (AuNRs). Electron withdrawing groups (EWGs) on the adsorbates induce larger homogeneous LSPR linewidths compared to those of electron donating groups (EDGs).[2] Furthermore, in our scanning electron microscopy-correlated DF spectroscopic measurements and density functional theory calculations, cucurbit[7]uril (CB[7])-based host–guest supramolecular interactions were employed for the first time to examine and control the CID process using monoamine-functionalized CB[7] (CB[7]-NH2) attached to single AuNRs.[3] A new method of in situ tuning of CID through the CB[7]-oxaliplatin complexation, which can result in the variation of chemical nature and electronic properties of adsorbates, was presented. In addition, in situ tuning of CID was demonstrated through the competitive release of the oxaliplatin guest from the oxaliplatin@CB[7] complex, which was then replaced by a competitor guest of spermine at sufficient amount. Furthermore, nuclear magnetic resonance experiments confirmed that the release of the guest is the consequence of adding salt (NaCl). Thus, in situ reversible tuning of CID in single AuNRs was achieved through successive steps of encapsulation and release of a guest on the same AuNR in a flow cell.