Functionalized Multilayered Graphene Platform for Urea Sensor

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• 作者：Rajesh K. Srivastava ; Saurabh Srivastava ; Tharangattu N. Narayanan ; Bansi D. Mahlotra ; Robert Vajtai ; Pulickel M. Ajayan ; Anchal Srivastava
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：January 24, 2012
• 年：2012
• 卷：6
• 期：1
• 页码：168-175
• 全文大小：1043K
• 年卷期：v.6,no.1(January 24, 2012)
• ISSN：1936-086X

文摘

Multilayered graphene (MLG) is an interesting material for electrochemical sensing and biosensing because of its very large 2D electrical conductivity and large surface area. We propose a less toxic, reproducible, and easy method for producing functionalized multilayer graphene from multiwalled carbon nanotubes (MWCNTs) in mass scale using only concentrated H₂SO₄/HNO₃. Electron microscopy results show the MLG formation, whereas FTIR and XPS data suggest its carboxylic and hydroxyl-functionalized nature. We utilize this functionalized MLG for the fabrication of a novel amperometric urea biosensor. This biosensor shows linearity of 10鈥?00 mg dL^鈥?, sensitivity of 5.43 渭A mg^鈥? dL cm^鈥?, lower detection limit of 3.9 mg dL^鈥?, and response time of 10 s. Our results suggest that MLG is a promising material for electrochemical biosensing applications.

Keywords:

MWCNTs; graphene; biosensor; electron microscopy; X-ray photoelectron spectroscopy