Premium
Molecularly Ordered Bioelectrocatalytic Composite Inside a Film of Aligned Carbon Nanotubes
Author(s) -
Yoshino Syuhei,
Miyake Takeo,
Yamada Takeo,
Hata Kenji,
Nishizawa Matsuhiko
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200422
Subject(s) - materials science , glucose oxidase , composite number , composite film , electron transfer , carbon nanotube , electrode , molecule , chemical engineering , nanotechnology , composite material , organic chemistry , biosensor , chemistry , engineering
Molecularly ordered composites of polyvinylimidazole‐[Os(bipyridine) 2 Cl] (PVI‐[Os(bpy) 2 Cl]) and glucose oxidase (GOD) are assembled inside a film of aligned carbon nanotubes. The structure of the prepared GOD/PVI‐[Os(bpy) 2 Cl]/CNT composite film is entirely uniform and stable; more than 90% bioelectrocatalytic activity could be maintained even after storage for 6 d. Owing to the ideal positional relationship achieved between enzyme, mediator, and electrode, the prepared film shows a high bioelectrocatalytic activity for glucose oxidation (ca. 15 mA cm −2 at 25 °C) with an extremely high electron‐transfer turnover rate (ca. 650 s −1 ) comparable to the value for GOD solutions, indicating almost every enzyme molecule entrapped within the ensemble (ca. 3 × 10 12 enzymes in a 1 mm × 1 mm film) can work to the fullest extent. This free‐standing, flexible composite film can be used by winding on a needle device; as an example, a self‐powered sugar monitor is demonstrated.