Solidly mounted resonators with carbon nanotube electrodes for biosensing applications
Solidly mounted resonators with carbon nanotube electrodes for biosensing applications
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DOI：
10.1109/fcs.2011.5977728
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
L. Garcia-Gancedo;E. Iborra;M. Clement;J. Olivares;Z. Zhu;A. Flewitt;W. Milne;G. Ashley;J. K. Luo;X. Zhao;J. R. Lu
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文献类型：
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作者：
L. Garcia-Gancedo;E. Iborra;M. Clement;J. Olivares;Z. Zhu;A. Flewitt;W. Milne;G. Ashley;J. K. Luo;X. Zhao;J. R. Lu
这里报告的工作显示了使用标准金属电极和碳纳米管电极制造的基于 AlN 固装谐振器 (SMR) 的生物传感器的灵敏度的直接实验比较。已经制造出了在 1.75 GHz 左右频率谐振的 SMR，一些器件使用多壁碳纳米管 (CNT) 薄膜作为顶部电极材料，而一些相同的器件则使用铬/金电极。将不同浓度的蛋白质溶液加载到谐振器的顶部，并研究它们对物理吸附涂层的质量负载的响应。结果表明，使用碳纳米管作为顶部电极材料的谐振器对于给定负载表现出更高的频率变化，因为与金属薄膜电极相比，互连碳纳米管薄膜具有更高的活性表面积，因此表现出更大的质量负载灵敏度。因此得出的结论是，在谐振器上使用 CNT 电极作为重力生物传感器是可行且值得的。
The work reported here shows a direct experimental comparison of the sensitivities of AlN solidly mounted resonators (SMR)-based biosensors fabricated with standard metal electrodes and with carbon nanotube electrodes. SMRs resonating at frequencies around 1.75 GHz have been fabricated, some devices using a thin film of multi-wall carbon nanotubes (CNTs) as the top electrode material and some identical devices using a chromium/gold electrode. Protein solutions with different concentrations were loaded on the top of the resonators and their responses to mass-load from physically adsorbed coatings were investigated. Results show that resonators using CNTs as the top electrode material exhibited higher frequency change for a given load due to the higher active surface area of a thin film of interconnecting CNTs compared to that of a metal thin film electrode and hence exhibited greater mass loading sensitivity. It is therefore concluded that the use of CNT electrodes on resonators for their use as gravimetric biosensors is viable and worthwhile.