The detection of specific biomolecular interactions with micro-Hall magnetic sensors.

The detection of specific biomolecular interactions with micro-Hall magnetic sensors.
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DOI:
10.1088/0957-4484/20/35/355501
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发表时间:
2009-09-02
期刊:
影响因子:
3.5
通讯作者:
Xiong P
Xiong P
中科院分区:
材料科学3区
文献类型:
--
作者:
Manandhar P;Chen KS;Aledealat K;Mihajlović G;Yun CS;Field M;Sullivan GJ;Strouse GF;Chase PB;von Molnár S;Xiong P

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Detection of reagent-free specific biomolecular interactions through sensing of nanoscopic magnetic labels provides one of the promising routes to biosensing with solid-state devices. In particular, Hall sensors based on semiconductor heterostructures have shown exceptional magnetic moment sensitivity over a large dynamic field range suitable for magnetic biosensing using superparamagnetic labels. Here we demonstrate the capability of such micro-Hall sensors to detect specific molecular binding using biotin-streptavidin as a model system. We apply dip-pen nanolithography to selectively biotinylate the active areas of InAs micro-Hall devices with nanoscale precision. Specific binding of complementarily functionalized streptavidin-coated superparamagnetic beads to the Hall crosses occur via molecular recognition, and magnetic detection of the assembled beads is achieved at room temperature using phase-sensitive micro-Hall magnetometry. The experiment constitutes the first unambiguous demonstration of magnetic detection of specific biomolecular interactions with semiconductor micro-Hall sensors, and the selective molecular functionalization and resulting localized bead assembly demonstrate the possibility of multiplexed sensing of multiple target molecules using a single device with an array of micro-Hall sensors.
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