Electrochemical properties of ferrocenylalkane dithiol-gold nanoparticle films prepared by layer-by-layer self-assembly

Synthesis and characterization of ferrocene modified Fe3O4@Au magnetic nanoparticles and its application

“…Min et al (2007) has reported that the acetylcholinesterase (AChE) biosensor was fabricated by immobilizing of AChE on the surface of Au-doped magnetic Fe 3 O 4 NPs and used to determine organophosphorus pesticides. The immobilization of single-stranded biotinylated oligonucleotides onto gold-coated magnetic NPs as a DNA sensor was also conducted (Kouassi and Irudayaraj, 2006 Ferrocene and its derivatives are well-known substances as mediators (Petersson, 1986;Kulys and Dcosta, 1991;Escorcia and Dhirani, 2007), due to their various very desirable properties of relatively low molecular mass, good electrochemical reversibility, regeneration at low potential, and generation of stable redox forms (Pham et al, 2008;Qiu et al, 2007a,b;Fernandez and Carrero, 2005). However, for small electron transfer mediators, ferrocene and its derivatives modified electrodes are unstable and difficult to be controlled because of their weak adsorption on electrode surface, and leakage has been a main problem for the ferrocene and its derivatives modified electrodes.…”

Synthesis and Characterization of MWNTs/Au NPs/HS(CH2)6Fc Nanocomposite: Application to Electrochemical Determination of Ascorbic Acid

“…À1 n as (CH 2 ), 2848 cm À1 n s (CH 2 )] were clearly observed. Peak assignments were based on previous work performed on bulk and self-assembled ferrocene-terminated alkanethiolate monolayers on gold surfaces [34,46]. In addition, the S À H peak (2550 cm À1 ) [47] for HS(CH 2 ) 6 Fc was completely absent in Figure 4b.…”

Selective Determination of Dopamine on a Boron‐Doped Diamond Electrode Modified with Gold Nanoparticle/Polyelectrolyte‐coated Polystyrene Colloids

“…Herein, the construction of the assembly is important because a degree of randomness inherent in a self-assembly process would result in defects, disorder, and percolation effects, which may strongly influence the final properties of the materials. [47] As such the charge transfer rates were accordingly slower between the outer layers and the electrode surface as a result of intervention at each stage of the self-assembly process and obstruction of potentially insulting layers and complicated architectures, which results in the increasingly separated and wider CV peaks. These results combined with the above CV data were consistently observed and have been reported in other studies of multilayer films that contain AuNP/redoxactive linker units, [47][48][49] which highlights the significant effect of nanostructured building blocks and complicated architecture on influencing charge transfer.…”

“…[47] As such the charge transfer rates were accordingly slower between the outer layers and the electrode surface as a result of intervention at each stage of the self-assembly process and obstruction of potentially insulting layers and complicated architectures, which results in the increasingly separated and wider CV peaks. These results combined with the above CV data were consistently observed and have been reported in other studies of multilayer films that contain AuNP/redoxactive linker units, [47][48][49] which highlights the significant effect of nanostructured building blocks and complicated architecture on influencing charge transfer. Similar results have been reported for electrodes coated with oppositely charged PE films that are alternately assembled onto the electrode surface, in which the response of the Fe(CN) 6 4À/3À redox couple was severely suppressed when the surface was covered with a negatively charged PE layer.…”