Optical Trapping of a Single Molecule of Length Sub-1 nm in Solution

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外文摘要：Plasmonic optical manipulation has emerged as an affordable alternative to manipulate single chemical and biological molecules in nanoscience.Although the theoretical models of sub-5 nm single-molecule trapping have been considered promising,the exper-imental strategies remain a challenge due to the Brownian motions and weak optical gradient forces with significantly reduced molecular polarizability.Herein,we address direct trapping and in situ sensing of single molecules with unprecedented size,down to～5 Å in solution,by employing an adjustable plasmonic optical nanogap and single-molecule con-ductance measurement.The theoretical simulations demonstrate that local fields with a high enhance-ment factor,over 103,were generated at such small nanogaps,resulting in optical forces as large as sev-eral piconewtons to suppress the Brownian motion and trap a molecule of length sub-1 nm.This work demonstrates a strategy for directly manipulating the small molecule units,promising a vast multitude of applications in chemical,biological,and materials sciences at the single-molecule level.

外文关键词：

plasmon-enhanced trappingmolecular junctionmechanically controllable break junctionfinite-element simulation methodsingle-molecule conductance measurement

作者：

Biao-Feng Zeng、Ran Deng、Yu-Ling Zou、Chun-An Huo、Jing-Yu Wang、Wei-Ming Yang、Qing-Man Liang、Sheng-Jie Qiu、Anni Feng、Jia Shi、Wenjing Hong、Zhilin Yang、Zhong-Qun Tian、Yang Yang

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作者单位：

Department of Physics,Pen-Tung Sah Institute of Micro-Nano Science and Technology,State Key Laboratory of Physical Chemistry of Solid Surfaces,IKKEM,Xiamen University,Xiamen 361005

基金：

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金科技部项目福建省自然科学基金

项目编号：

T22220022197307922032004921611181217432421991130219052382021YFA12015022021J06008

出版年：

2023

DOI：

10.31635/ccschem.022.202202318

中国化学会会刊(英文)

CSCD

ISSN：

年,卷(期)：2023.5(4)

参考文献量62