DNA hybridization measurement by self-sensing piezoresistive microcantilevers in CMOS biosensor

S. M. Yang, C. Chang, T. I. Yin, P. L. Kuo

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)

摘要

Understanding the mechanism of how biological reactions produce mechanical loadings is fundamental to biomedical developments. A CMOS biosensor chip is developed to measure in situ the induced surface stress change by DNA hybridization. For 20-mer thiol-modified single stranded DNA (ssDNA), the mechanism of ssDNA attached to gold surface via a sulfur-gold linkage can be investigated by using the Langmuir adsorption model. Experimental results indicate that the immobilization response is less than 1 s, the total number of ssDNA molecules on the cantilever is about 3 × 1011, and the induced surface stress is 0.15 N/m. The surface stress sensitivity of the sensor is about 3.5 × 10-5 m/N. The estimated adsorption rate of the ssDNA is 0.005 s-1. The biosensor is capable of discriminating complimentary molecular targets and thus may provide a powerful platform for high throughput real-time analysis of DNA.

原文English
頁(從 - 到)674-681
頁數8
期刊Sensors and Actuators, B: Chemical
130
發行號2
DOIs
出版狀態Published - 2008 3月 28

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 儀器
  • 凝聚態物理學
  • 表面、塗料和薄膜
  • 金屬和合金
  • 電氣與電子工程
  • 材料化學

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