Surface Modification of Solid‐State Nanopores for Sticky‐Free Translocation of Single‐Stranded DNA

作者：Zhipeng Tang, Bo Lu, Qing Zhao, Jiajun Wang, Kaifu Luo, Dapeng Yu · 发表于：Small · 年份：2014 · DOI：10.1002/smll.201401091 · 被引用次数：53 · 研究领域：Nanopore and Nanochannel Transport Studies、Fuel Cells and Related Materials、Machine Learning and ELM

Nanopore technology is one of the most promising approaches for fast and low-cost DNA sequencing application. Single-stranded DNA detection is primary objective in such device, while solid-state nanopores remain less explored than their biological counterparts due to bio-molecule clogging issue caused by surface interaction between DNA and nanopore wall. By surface coating a layer of polyethylene glycol (PEG), solid-state nanopore can achieve long lifetime for single-stranded DNA sticky-free translocation at pH 11.5. Associated with elimination of non-specific binding of molecule, PEG coated nanopore presents new surface characteristic as less hydrophility, lower 1/f noise, and passivated surface charge responsiveness on pH. Meanwhile, conductance blockage of single-stranded DNA is found to be deeper than double-stranded DNA, which can be well described by a string of blobs model for a quasi-equilibrium state polymer in constraint space.