A Facile Preparation of H2O2 Sensors Using Layer-by-Layer Deposited Thin Films Composed of Poly(ethyleneimine) and Carboxymethyl Cellulose as Matrices for Immobilizing Hemin
✍ Scribed by Baozhen Wang; Xiaoyan Du; Maoqing Wang; Weilei Gong; Jun-ichi Anzai
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 429 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1040-0397
No coin nor oath required. For personal study only.
✦ Synopsis
A layer-by-layer (LbL) thin film composed of poly(ethyleneimine) (PEI) and carboxymethyl cellulose (CMC) was prepared on the surface of a gold (Au) disk electrode and the LbL layer was impregnated with hemin to fabricate amperometric hydrogen peroxide (H 2 O 2 ) sensors. Hemin can be easily immobilized in the LbL layer by immersing the LbL film-coated electrode in the hemin solution. The hemin-modified electrode thus prepared exhibited an amperometric response to H 2 O 2 on the basis of the electrochemical reduction catalyzed by hemin. The output current of the hemin-modified electrode depended on the concentration of H 2 O 2 over the range of 0.005 -1.0 mM. Thus, the LbL film composed of PEI and CMC was found to be an excellent material for the facile preparation of hemin-based H 2 O 2 sensors.