Self-assembled monolayers of pyridylthio-functionalized carbon nanotubes used as a support to immobilize cytochrome c

Abstract

Self-assembled monolayers (SAMs) of pyridylthio-functionalized multiwalled carbon nanotubes (pythio-MWNTs) have been constructed on the gold substrate surface, which were used as a support to immobilize cytochrome c (Cyt c). The assembly processes of the SAMs and adsorption of Cyt c were monitored by using quartz crystal microbalance (QCM). Based on the frequency change of the QCM resonator, the surface coverage for the SAMs of pythio-MWNTs was estimated to be about 5.2 μg/cm2, and that of the Cyt c adsorbed was about 0.29 μg/cm2. For the gold electrode modified by the SAMs of pythio-MWNTs-Cyt c, a quasi-reversible redox wave was recorded with the cathodic and anodic potentials at about −0.55 and −0.28 V vs Ag/AgCl, respectively. Compositions and morphologies of the SAMs before and after immobilization of Cyt c were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and atomic force microscopy.

Simultaneous and Highly Sensitive Determination of Hydroquinone and Catechol Using Carboxyl Functionalized Graphene Self‐Assembled Monolayers

“…Self‐assembled monolayers (SAMs) can realize the ordered assembling of nanomaterials and many organic compounds onto a solid surface 27, 28. The SAMs are highly ordered two‐dimensional monolayers with interesting advantages, including densely packed molecular arrangement and controllable structural regularity 29. They have been applied in variety aspects, such as adhesion, micro‐/nanoelectronic devices and lubrication, etc 30–32.…”

Silver(I)-directed growth of metal-organic complex nanocrystals with bidentate ligands of hydroquinine anthraquinone-1,4-diyl diethers as linkers at the water-chloroform interface

“…Figure 7 B shows the CV curves for the Ag-(DHQ) 2 AQN nanocrystals in the 0.01 mol/L HClO 4 electrolyte solutions in the potential range of -0.1 to 0.5 V at the scan rates from 0.05 to 0.6 V/s. One couple of redox wave was recorded with the cathodic and anodic potentials at around -0.13 ~ 0.07 and 0.28 ~ 0.32 V, which was attributed to the redox reaction of the connector of Ag + ions [ 36 ], with the electron transfer process of Ag-(DHQ) 2 AQN and Ag + -(DHQ) 2 AQN. The potential difference Δ E was 0.35 V when the scan rate was 0.05 V/s, which increased to 0.45 V when the scan rate was 0.6 V/s.…”

“…A close inspection of the figure could further find that this line did not go through the zero point. This feature suggested that, besides the diffusion layer, the electron transfer process between the Ag-(DHQ) 2 AQN nanocrystals and electrode surface may be also influenced by some other issues, such as the interfacial resistance between the nanocrystals and electrode surface and the connectors of AgNO 3 between the ligands and electrode surface [ 36 ].…”