Based on magnetoelastic biosensor for the heavy ion detection, this paper is committed to study the influence of the excitations and detection positions on the sensitivity of magnetoelastic biosensors. The frequency response of biosensors with different excitations and different detection positions were studied. The numerical simulation software ANSYS [TM] Ansoft Maxwell was applied to calculate the distribution of magnetic field around the coil. The optimal excitation value was determined by this simulation. The frequency test of the magnetoelastic sensor was analyzed by a network analyzer, which showed the frequency in the middle of coil is better than in the two ends.
Surface stress-based biosensors as a crucial part of micro-scale and label-free system, use free energy change, the underlying concept in any binding reaction, have been investigated extensively in recent years. In this paper, a new bi-micro-cantilever surface stress biosensor is proposed which can be used to detect cells. Some fundamental study has been done, especially for the micro-cantilever due to its crucial role in the whole system. To acquiring the optimal material for more sensitive sensor, four material, Si, SiN, AlN, PMMA(polymethylmethacrylate), were contrastively analyzed under the same conditions (loads, size, environmental factor. etc) by finite element (FE) method. This study could provide some foundation for the biosensor design and fabrication.
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