2025/4/28(一)演講公告

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上層分類：系所公告

分類：演講

建立於 2025-04-21, 週一 17:33

最近更新於 2025-04-21, 週一 17:38

發佈於：2025-04-21, 週一 17:38

點擊數：1497

演講者：陳祺 博士

演講題目：Near-field spectroscopic imaging of 2D materials and lipid bilayers

演講地點：博雅館102室

演講時間：114.04.28 上午10點20分~12點10分

演講摘要：

Scanning near-field optical microscopy (SNOM) is a scanning probe technique that combines optics with atomic force microscopy (AFM) to achieve subdiffraction-limit optical resolution. We employed near-field photoluminescence (NF-PL) to study the atomically sharp 1D interfaces between WS2 and MoS2. With an optical resolution of 68 nm, a 105 nm-wide region for quenched PL was confirmed using NF-PL imaging, which resolved the narrowest quenching region thus far. For low-quantum-yield materials, we developed the near-field broadband transmission (NF-tr) method, which provides abbreviation-free and nanoscale-resolution imaging capabilities for the entire conduction band over a highly lateral inhomogeneity. Both bandgap evolutions with varying compositions and bilayer coupling effect were visualized in real space with 135 nm spatial resolution.
With further instrumentation challenges, we developed a water-phase SNOM system for lateral distribution and phase segregation of supported lipid bilayers (SLB). Surprisingly, the SNOM tip can manipulate local lipid molecules from the gel phase to the fluid phase, and vice versa, which causes the fluorescence contrast to flip the opposite. This demonstrates that there was no particular partition of the fluorescence tag in the fluid or gel phases. Our results reveal the fundamental mechanisms and offer a practical guide for interpreting the partitioning of fluorescent tags.

關於講者：

服務單位：中研院應科中心

職稱：研究員

學歷：

畢業學校	國別	主修學門系所	學位
Univ. California at Irvine	US	Chemistry	PhD
NTU		Chemistry	MS
NTU		Chemistry	BS

 

經歷：

	服務機關	服務部門	職稱
現職：	中研院	應科中心	助研究員

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