SAMs modified gold

Campuzano et al. [39] Soft drinks Glucose oxidase (GOx)/ cross-linked with glutaraldehyde Mercaptopropionic acid (MPA)-SAM-modified gold electrode/+0.2 V vs. Ag/AgCl Tetrathiafulvalene (TTF) (also cross-linked with glutaraldehyde)... 

FDH)/with glutaraldehyde monolayer (SAM) modified gold disc electrode/+0.1 V vs. Ag/AgCl glutaraldehyde... 

Figure 7.5. Typical Osteryoung square wave voltammograms of CoOBTPc-SAM modified gold electrodes in pH 4 buffer solutions before (i) and after the addition of (ii) 9.30 x 10 mol dm 3 1.98 x 10 mol dm 3 (iv) 40.5 x 10 mol dm 3 (y) 80.0 x 10 mol...

Fig. 2 Potential dependence of photocurrents of the PQSH SAM-modified gold electrode measured in a phosphate buffer solution containing 0.1 M Na2S04 + 50 mM EDTA + 5 mM MV + at a pH of 3.5 (a), 4.5 (b), and 5.5 (c) [56, 57].

Fig. 3 Time course of the current at the PorFcSH SAM-modified gold electrode held at various potentials when the electrode was illuminated with 430 nm pulsed light (40 tW cm 8.7 x 10 photon s cm ) [58. ...

Fig. 11 Schematic illustration of control of electron transfer by photo-irradiation at the FcAzSH SAM-modified gold electrodes (112].

When the potential was scanned to 0 mV, a pair of waves due to the redox of the azobenzene moiety appeared, in addition to that of ferrocene in the first potential scan (sohd line in Fig. 13c). The wave due to the redox of azobenzene, however, disappeared, and the redox potential and the peak separation of the redox wave due to ferrocene became more negative and smaller, respectively, in the second scan (dotted line in Fig. 13c). The redox potential and the peak separation returned to the original values after UV irradiation. These changes in the electrochemical characteristics of the latter electrode were reversible. On the basis of the structural analysis results by in situ Fourier-transform infrared reflection absorption spectroscopy (FT-IRRAS), we concluded that the electrochemical properties, that is, the redox potential and the charge transfer rate, of the ferrocene group in the SAM-modified gold electrode can be reversibly controlled... 

Fig. 13 CVs of (a) the 100% tra/is-AzFcSH SAM-modified gold electrode measured in the potential range between 0 and +750 mV (b) the 20% cis- and 80% trans-AzFcSH SAM-modified gold electrode measured in the potential range between +200 and +750 mV. (c) The first scan (solid line) and second scan (dotted line) of the CVs of the 20% cis- and 80% trans-AzFcSH SAM-modified gold electrode measured in the potential region between 0 and +750 mV. Note that the potential scan was started from +200 mV in the positive direction. The electrolyte and scan rate in all of the above experiments were 0.1 M HCIO4 and 50 mV s" respectively [118].

Spiropyran/merocyanine photoisomerization was also used at the alkylthiol SAM-modified gold electrodes to gate/ungate electron transfer [130-133]. WiUner etal. constructed a spiropyran/merocyanine-... 

Fig. 14 Schematic illustration at the interface (a) between the 100% trans-AzFcSH SAM-modified gold electrode and the electrolyte solution containing perchlorate anions and (b) between the 20% cis-and 80% trans-AzFcSH SAM-modified gold electrode and the electrolyte solution containing perchlorate anions before the potential scan to OmV [118],...

The immobilization of interesting biosystems such as DNA, protein, enzymes, and cells on SAM modified gold. 

An example of the selective detection of E. coli involved an impedimetric immunosensor developed using SAM-modified gold screen-printed electrodes (SPEs) [27]. In this... 

Calix[4,6,8]arene derivatives were prepared for the fabrication of SAM redox-active ion, steroids, aromatic amines, metolcarb sensors on Au surfaces. SPR spectroscopy, CV and electrochemical impedance spectroscopy, contact angle measurements were used to monitor guest recognition of the SAM-modified gold electrodes [36-41], Furthermore, multilayering calix[4]resorcinarene was also deposited on ordered Au, quartz and other substrates [42]. 

---