| Autor: |
Hsiao Chien Chen, Yin Chih Liu, Yu Chen Lin, Mu-Yi Hua, Rung Ywan Tsai |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 56:9488-9495 |
| ISSN: |
0013-4686 |
| DOI: |
10.1016/j.electacta.2011.08.043 |
| Popis: |
We have developed a polyaniline/carboxy-functionalized multiwalled carbon nanotube (PAn/MWCNTCOOH) nanocomposite by blending the emeraldine base form of polyaniline (PAn) and carboxy-functionalized multiwalled carbon nanotubes (MWCNT) in dried dimethyl sulfoxide (DMSO) at room temperature. The conductivity of the resulting PAn/MWCNTCOOH was 3.6 × 10−3 S cm−1, mainly as a result of the protonation of the PAn with the carboxyl group and the radical cations of the MWCNT fragments. Horseradish peroxidase (HRP) was immobilized within the PAn/MWCNTCOOH nanocomposite modified Au (PAn/MWCNTCOOH/Au) electrode to form HRP/PAn/MWCNTCOOH/Au for use as a hydrogen peroxide (H2O2) sensor. The adsorption between the negatively charged PAn/MWCNTCOOH nanocomposite and the positively charged HRP resulted in a very good sensitivity to H2O2 and an increased electrochemically catalytical current during cyclic voltammetry. The HRP/PAn/MWCNTCOOH/Au electrode exhibited a broad linear response range for H2O2 concentrations (86 μM–10 mM). This sensor exhibited good sensitivity (194.9 μA mM−1 cm−2), a fast response time (2.9 s), and good reproducibility and stability at an applied potential of −0.35 V. The construction of the enzymatic sensor demonstrated the potential application of PAn/MWCNTCOOH nanocomposites for the detection of H2O2 with high performance and excellent stability. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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