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Detecting a single molecule using a micropore-nanopore hybrid chip

Lei Liu12*, Lizhong Zhu1, Zhonghua Ni1 and Yunfei Chen1

Author Affiliations

1 Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanics, Southeast University, Nanjing 210096, People's Republic of China

2 Suzhou Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Suzhou Research Institute of Southeast University, Suzhou 215123, People's Republic of China

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Nanoscale Research Letters 2013, 8:498  doi:10.1186/1556-276X-8-498

Published: 21 November 2013

Abstract

Nanopore-based DNA sequencing and biomolecule sensing have attracted more and more attention. In this work, novel sensing devices were built on the basis of the chips containing nanopore arrays in polycarbonate (PC) membranes and micropores in Si3N4 films. Using the integrated chips, the transmembrane ionic current induced by biomolecule's translocation was recorded and analyzed, which suggested that the detected current did not change linearly as commonly expected with increasing biomolecule concentration. On the other hand, detailed translocation information (such as translocation gesture) was also extracted from the discrete current blockages in basic current curves. These results indicated that the nanofluidic device based on the chips integrated by micropores and nanopores possessed comparative potentials in biomolecule sensing.

Keywords:
Nanopore; Biosensing; Biomolecule