Dynamic micro-Hall detection of superparamagnetic beads in a microfluidic channel

[摘要] We report integration of an InAs quantum well micro-Hall magnetic sensor with microfluidics and real-time detection of moving superparamagnetic beads. Beads moving within and around the Hall cross area result in positive and negative Hall voltage signals, respectively. Relative magnitudes and polarities of the signals measured for a random distribution of immobilized beads over the sensor are in good agreement with calculated values and explain consistently the shape of the dynamic signal. (C) 2010 Elsevier B.V. All rights reserved.

[发布日期] 2010-12-01

[关键词] InAs quantum well;Microfluidics;Superparamagnetic bead;Micro-Hall sensor