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標題: A high sensitivity field effect transistor biosensor for methylene blue detection utilize graphene oxide nanoribbon
作者: Lin, Ting-Chun
Li, Yan-Sheng
Chiang, Wei-Hung
Pei, Zingway
關鍵字: Field effect transistor
Graphene oxide nanoribbon
Methylene blue
Biosensing Techniques
Electrochemical Techniques
Equipment Design
Methylene Blue
Transistors, Electronic
摘要: In this work, we developed a field effect transistor (FET) biosensor utilizing solution-processed graphene oxide nanoribbon (GONR) for methylene blue (MB) sensing. MB is a unique material; one of its crucial applications is as a marker in the detection of biomaterials. Therefore, a highly sensitive biosensor with a low detection limit that can be fabricated simply in a noncomplex detection scheme is desirable. GONR is made by unzipping multiwall carbon nanotubes, which can be mass-produced at low temperature. The GONR-FET biosensor demonstrated a sensitivity of 12.5μA/mM (determined according to the drain current difference caused by the MB concentration change). The Raman spectra indicate that the materials quality of the GONR and the domain size for the C=C sp2 bonding were both improved after MB detection. X-ray photoelectron spectroscopy revealed that the hydroxyl groups on the GONR were removed by the reductive MB. According to XPS and Raman, the positive charge is proposed to transfer from MB to GONR during sensing. This transfer causes charge in-neutrality in the GONR which is compensated by releasing •OH functional groups. With high sensitivity, a low detection limit, and a simple device structure, the GONR-FET sensor is suitable for sensing biomaterials.
Appears in Collections:光電工程研究所



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