Nanobubbles in solid-state nanopores

被引：121

作者：

Smeets, R. M. M. ^{[1
]}

Keyser, U. F. ^{[1
]}

Wu, M. Y. ^{[1
]}

Dekker, N. H. ^{[1
]}

Dekker, C. ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 08期

关键词：

DNA TRANSLOCATION; MOLECULES; DISCRIMINATION; FABRICATION; TRANSPORT; SURFACE; CHANNEL;

D O I：

10.1103/PhysRevLett.97.088101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

From conductance and noise studies, we infer that nanometer-sized gaseous bubbles (nanobubbles) are the dominant noise source in solid-state nanopores. We study the ionic conductance through solid-state nanopores as they are moved through the focus of an infrared laser beam. The resulting conductance profiles show strong variations in both the magnitude of the conductance and in the low-frequency noise when a single nanopore is measured multiple times. Differences up to 5 orders of magnitude are found in the current power spectral density. In addition, we measure an unexpected double-peak ionic conductance profile. A simple model of a cylindrical nanopore that contains a nanobubble explains the measured profile and accounts for the observed variations in the magnitude of the conductance.

引用

页数：4

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