2011-9-16 15:34:37　来源：上海微系统与信息技术研究所


　　中科院上海微系统与信息技术研究所王跃林/李铁课题组与上海应用物理研究所樊春海课题组以快报形式报导了他们在超高灵敏硅纳米线DNA传感器方面的合作研究进展。

　　研究人员在传统半导体加工技术的基础上，利用硅材料自身的工艺选择性，基于自上而下方法发展了硅纳米线加工技术，并实现了纳米级尺寸的精确控制。硅纳米线不但宽度可以达到20纳米，而且其三角形截面具有更大的比表面积，有利于器件性能的提高，为批量制备高检测灵敏度的阵列FET生物传感器迈出了坚实的一步。

　　通过对硅纳米线进行硅烷化修饰、表面单分子膜层自组装以及单链DNA探针的固定，他们研制的DNA传感器成功实现了对低至1 fM 的DNA靶标分子的响应，这是目前已报导的最灵敏的基于硅纳米线FET的DNA传感器。

这种DNA传感器还可以实现对单碱基错配的分析和对多种病原DNA序列的同时检测。(生物谷Bioon.com)

　　Silicon-Nanowire-Based CMOS-Compatible Field-Effect Transistor Nanosensors for Ultrasensitive Electrical Detection of Nucleic Acids

　　Anran Gao , Na Lu , Pengfei Dai , Tie Li* , Hao Pei , Xiuli Gao , Yibin Gong , Yuelin Wang , and Chunhai Fan*

　　We herein report the design of a novel semiconducting silicon nanowire field-effect transistor (SiNW-FET) biosensor array for ultrasensitive label-free and real-time detection of nucleic acids. Highly responsive SiNWs with narrow sizes and high surface-to-volume-ratios were “top-down” fabricated with a complementary metal oxide semiconductor compatible anisotropic self-stop etching technique. When SiNWs were covalently modified with DNA probes, the nanosensor showed highly sensitive concentration-dependent conductance change in response to specific target DNA sequences. This SiNW-FET nanosensor revealed ultrahigh sensitivity for rapid and reliable detection of 1 fM of target DNA and high specificity single-nucleotide polymorphism discrimination. As a proof-of-concept for multiplex detection with this small-size and mass producible sensor array, we demonstrated simultaneous selective detection of two pathogenic strain virus DNA sequences (H1N1 and H5N1) of avian influenza.

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