Polyaniline modified

C.L. Wang and A. Mulchandani, Ferrocene-conjugated polyaniline-modified enzyme electrodes for determination of peroxides in organic media. Anal. Chem. 67, 1109-1114 (1995). 

Polyaniline-modified electrodes allow electrometric determination of hydrogen peroxide produced in aminooxidase systems, without interference of electroreactive amino acids, such as cysteine, histidine, methionine, tyrosine and tryptophan359. 

Figure 13.6 In situ infrared reflectance spectra of polyaniline-modified electrodes in solution containing 0.10 M HC1. Spectra collected at applied potentials indicated at right of curves, and normalized according to Eq. 13.12 using R0 collected at -0.1 V. Potentials measured against saturated calomel electrode. [From Ref. 54.]...

A. Eftekhari, Glycerol biosensor based on glycerol dehydrogenase incorporated into polyaniline modified aluminum electrode using hexacyano-ferrate as mediator, Sens. Actuators B Chem., 80(3) (2001) 283-289. 

X Li, D. Wang, G. Cheng, Q. Luo, J. An, Y. Wang, Preparation of polyaniline-modified Ti02 nanoparticles and their photocatalytic activity under visible light illumination . Applied Catalysis B Environmental, 81, 24, 267-273, (2008). 

L.H. Mascaro, D. Goncalves, and L.O.S. BuUioes, Electrocatalytic propereties and electrochemical stahihty of polyaniline and polyaniline modified with platinum nanoparticles in formaldehyde medium. Thin Solid Films, 461, 243-249 (2004). 

The second example is the polyaniline modified electrode known for some time in detail. 

Fig. 10. ESR-spectrum of a polyaniline modified electrode, a) anodic oxidation at +1.0 V, b) renewed spins under UV-irradiation. 

Fig.ll. ESR-spectrum of a polyaniline modified electrode before (a) and after (b) the reaction with benzoquinone (The amplification ratio of a to b is 20). 

Polyaniline is an attractive electropolymerizable polymer for surface modifications due to its unique redox properties, high electrical conductance, and ease of preparation. In addition, polyaniline-modified surfaces retain a large specific surface area and can remain conductive facilitating subsequent electron transfer. Feng and coworkers [8] constructed a DNA impedance biosensor based on gold nanoparticle/pol5 niline nanotube membranes formed in the presence of chitosan as shown in Fig. 14.1. Chitosan was used... 

Carbon paper Polyaniline modified by Carbon paper Palm oil mill Two-chamber Glucose P.D. = 136.2 P.D. = 92.4 mW 106... 

Polyaniline modified GCEs were prepared by depositing polyaniline film on polished GCE from 0.1 M aniline in 1.0 M perchloric acid and 0.1 M aniline plus 0.2 M TBAP in acetonitrile by cycling the potential at 100 mV s- between -0.2 and 0.9 V vs. Ag/AgCl for 5 cycles. 

Figure 7 shows the response of polyaniline modified with copper chloride (CuCy and unmodified polyaniline to 10 ppm H2S. The unmodified film shows essentially no change in resistance, while the modified polyaniline film shows a resistance decrease of over four orders of magnitude. 

These authors have reported a greater current for oxidation of formic acid on a polyaniline-modified platinum electrode than on a bare platinum electrode. This increase in current indicates the promoting effect of polyaniline, which can be due to the prevention of contamination of the platinum electrode by strong adsorption of the carbonyl group. These authors have also reported that CO (carbon monoxide) does not become adsorbed on polyaniline. Aurian-Blageni et al... 

Chawla, S., Rawal, R., Sharma, S. and Pundir, C.S. (2012) An amperometric biosensor based on laccase immobihzed onto nickel nanoparticles/carboxylated multiwalled carbon nanotubes/polyaniline modified gold electrode for determination of phenolic content in fmit juices. Biochem. Eng. J., 68,76-84. 

We have found similar results in our laboratories making impregnated papers with PPy and PAn for inverse thin layer chromatography. 7 0 method we used to prepare polyaniline-modified paper was to load filter paper strips with aniline, which was allowed to diffuse throughout the paper for about ten minutes. The strips were then immersed in FeClj that had been acidified with HCl. Chemical polymerization was allowed to proceed for about forty hours. The chemical structure of polyaniline prepared in this matter was presumed to be the same as the electrochemically polymerized polymer. However, the morphology of the polymer surface was that of the filter paper substrate. The polyaniline adheres well to the filter paper when it is dried, and no problems with chemical instability were observed. 

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