IAMS/NTU Chem Lecture on Nov. 27, 3:30pm, Poe Lecture Hall, Prof. Hsin-Zon Tsai 蔡欣融助理教授
消息來源：原分所
截止日期：2025-11-27
IAMS/NTU Chem Lecture Announcement中研院原分所與臺大化學系聯合演講公告
Title: Designing and Manipulating Surface Charge at the Atomic Scale: From Molecular Synthesis to Field-Effect Control
Speaker: Prof. Hsin-Zon Tsai (Department of Physics, National Cheng-Kung University) 蔡欣融助理教授 (國立成功大學物理學系)
Time: 3:30 PM, November 27 (Thursday), 2025
Place: Dr. Poe Lecture Hall, IAMS (本所浦大邦講堂臺大校園內)
Contact: Dr. Yang-hao Chan 詹楊皓博士
Abstract: Precise control of chemical doping and surface ionic behavior at the atomic scale opens new avenues for designing functional quantum and molecular materials. In this talk, I will present how bottom-up molecular synthesis combined with scanning probe microscopy enables direct visualization and manipulation of charge and structure in graphene-based nanostructures. Using molecular precursors, we achieve atomically defined graphene nanoribbon heterojunctions through controlled on-surface reactions and thermally induced bond rearrangement, allowing systematic tuning of band alignment and dopant distribution verified by bond-resolved STM, nc-AFM, and tunneling spectroscopy. Extending this chemical control to dynamic regimes, gate-tunable graphene field-effect platforms are used to reversibly ionize and reposition individual molecules, creating programmable surface ionic configurations that modulate the local electronic environment. Together, these results establish a coherent framework for atomic-level chemical control and charge manipulation in low-dimensional materials, opening new opportunities for designing functional quantum and electronic architectures.
Abstract: Precise control of chemical doping and surface ionic behavior at the atomic scale opens new avenues for designing functional quantum and molecular materials. In this talk, I will present how bottom-up molecular synthesis combined with scanning probe microscopy enables direct visualization and manipulation of charge and structure in graphene-based nanostructures. Using molecular precursors, we achieve atomically defined graphene nanoribbon heterojunctions through controlled on-surface reactions and thermally induced bond rearrangement, allowing systematic tuning of band alignment and dopant distribution verified by bond-resolved STM, nc-AFM, and tunneling spectroscopy. Extending this chemical control to dynamic regimes, gate-tunable graphene field-effect platforms are used to reversibly ionize and reposition individual molecules, creating programmable surface ionic configurations that modulate the local electronic environment. Together, these results establish a coherent framework for atomic-level chemical control and charge manipulation in low-dimensional materials, opening new opportunities for designing functional quantum and electronic architectures.