We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Direct Electrochemistry and Electrocatalysis of Hemoglobin on Aligned Carbon Nanotubes Based Electrodes Modified with Au Nanoparticles and SiO<sub>2</sub> Gel.
- Authors
Yang, Jing; Xu, Ying; He, Pingang; Fang, Yuzhi
- Abstract
Here we report on the preparation and characterization of new electrodes based on aligned carbon nanotubes (ACNTs) for hemoglobin (Hb) electrochemistry and electrocatalysis. The ACNTs are obtained by a thermal chemical vapor deposition method under normal pressure. Then the electrodes are elaborated by first sputtering a thin Au film (thickness of 200 nm) onto the top of the ACNTs, and then removing the Au layer/ACNTs from the quartz substrate with the aide of hydrofluoric acid (HF) treatment. Field emission scanning electron microscopy (FESEM) demonstrates that after nitric acid (HNO3) treatment, the nanotubes of the removed Au layer are totally tip-opened, purified and organized in a perfect vertically aligned architecture. The final ACNTs electrode is obtained by attaching the Au layer of ACNTs onto a glassy carbon electrode. Then the electrode was modified to act as a matrix for hemoglobin (Hb) immobilization and as an electrode for Hb electroanalysis by the assistance of Au nanoparticles (AuNPs) and SiO2 gel. Due to the individual specific effects of AuNPs, SiO2 gel and ACNTs, the resulting SiO2/Hb-AuNPs/ACNTs electrode showed good direct electrochemistry of Hb with an apparent MichaelisMenten constant of 0.44 mM. The electrode showed an excellent electrocatalytic activity towards H2O2, possessing a linear range from 40 µM to 4 mM and the detection limit was 22 µM based on a signal to noise ratio of 3.
- Subjects
ELECTROCHEMISTRY; ELECTROCHEMICAL analysis; HEMOGLOBINOMETRY; CARBON nanotubes; CHEMICAL vapor deposition; FIELD emission electron microscopy; SCANNING electron microscopy
- Publication
Electroanalysis, 2013, Vol 25, Issue 10, p2345
- ISSN
1040-0397
- Publication type
Article
- DOI
10.1002/elan.201300196