Preparation of Polybenzimidazole-Carboxylated Multiwalled Carbon Nanotube Composite for Intrinsic Sensing of Hydrogen Peroxide

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• 作者：Mu-Yi Hua ; Hsiao-Chien Chen ; Rung-Ywan Tsai ; Shen-Jui Tseng ; Sung-Cheng Hu ; Cheng-Der Chiang ; Pai-Jung Chang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 11, 2011
• 年：2011
• 卷：115
• 期：31
• 页码：15182-15190
• 全文大小：1095K
• 年卷期：v.115,no.31(August 11, 2011)
• ISSN：1932-7455

文摘

A three-dimensional composite was prepared from polybenzimidazole and carboxylated multiwalled carbon nanotubes (PBI-MWCNT-COOH). The composite was used to modify gold (Au) electrodes for hydrogen peroxide (H₂O₂) detection. The carboxylated nanotubes acted as a reducing agent, reacting with H₂O₂ to form the nanotube peroxy acid MWCNT-COOOH. The peroxy acid in turn oxidized the imine site of PBI to form PBI N-oxide, which could be electrochemically reduced to PBI, resulting in a current signal proportional to the peroxide concentration. Under optimal conditions, the amperometric response to H₂O₂ was linear for concentrations from 6.25 渭M to 10 mM, with high sensitivity (617.3 渭A mM^鈥? cm^鈥?) and rapid response (2.2 s) at an applied potential of 鈭?.37 V. The sensor also displayed high selectivity and excellent stability.