Preparation of highly conjugated water-dispersible graphene–butyric acid for the enhancement of electron transfer within polyamic acid–benzoxazole: Potential applications in electrochemical sensing
| Autor: | Yen Hsuan Chen, Mu-Yi Hua, Shi Liang Chen, Yaw-Terng Chern, Rung Ywan Tsai, Hsiao Chien Chen |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Polymers Biomedical Engineering Biophysics Electrons Biosensing Techniques Conjugated system Sensitivity and Specificity Catalysis Choline law.invention Electron Transport chemistry.chemical_compound law Polymer chemistry Benzene Derivatives Electrochemistry Electrodes Benzoxazoles Aqueous solution Graphene Succinic anhydride Chemical modification Electrochemical Techniques Hydrogen Peroxide General Medicine Benzoxazole Electrochemical gas sensor Glucose chemistry Chemical engineering Butyric Acid Graphite Gold Biosensor Biotechnology |
| Zdroj: | Biosensors and Bioelectronics. 46:84-90 |
| ISSN: | 0956-5663 |
| DOI: | 10.1016/j.bios.2013.01.064 |
| Popis: | To break through the long time and complex procedures for the preparation of highly conjugated reduced graphene oxide (r-GO) in developing electrochemical sensor, a time-saving and simple method is investigated in this study. One novel step of the exfoliated accompanying carboxylated graphene sheet from pristine is achieved via Friedel-Crafts acylation. By electrophilic aromatic substitution, the succinic anhydride ring is opened and attaches covalently to the graphene sheet (Gs) to form exfoliated graphene with grafted 1-one-butyric acid (Gs-BA). The grafting chain converts anions in aqueous solution to maintain Gs-BA in a stable dispersion and noticeably decreases the π-π stacking of the exfoliated Gs during the drying process. The analytical results of the absorption spectroscopy demonstrate that the conjugation of Gs-BA is not significantly destroyed by this chemical modification; Gs-BA retains the Gs electrical properties favorable for developing electrochemical sensors. When polyamic acid-benzoxazole (PAA-BO), a hydrogen peroxide (H₂O₂)-sensitive probe, hybridizes with Gs-BA to form Gs-BA-PAA-BO, the electron transfer rate relating to the response time improves markedly from 1.09 s(-1) to 38.8 s(-1). Additionally, it offers a high performance for H₂O₂ sensing in terms of sensitivity and response time, making this method applicable for developing glucose and choline biosensors. |
| Databáze: | OpenAIRE |
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