Showing papers by "Andrew Hamnett published in 1994"
TL;DR: In this article, it was shown for the first time that it is possible to employ electrochemical in situ Fourier transform infrared (FTIR) spectroscopy to study the electro-oxidation of methanol at small platinum particles.
80 citations
TL;DR: In this article, the conductivity of polythiophene films was measured in various states of oxidation, the doping anion being PF6−, with the transport number for the electronic charge being at least 0.95 and the diffusion coefficient for the anion must be less than 10−11 cm2 s−1.
71 citations
TL;DR: In this paper, the results of combined in situ Fourier transform infrared spectrometric and ellipsometric investigations of three types of film are reviewed, and the complementary nature of these two powerful techniques is explored.
Abstract: The results of combined in situ Fourier transform infrared spectrometric and ellipsometric investigations of three types of film are reviewed, and the complementary nature of these two powerful techniques is explored. The films were chosen to represent three possible levels of redox centre interaction, varying from the essentially independent in poly(4-vinyl-4′-methyl-2,2′-bipyridylrheniumtricarbonyl chloride) through optically coupled systems such as Prussian Blue to the strongly correlated systems exemplified by poly(pyrrole), and in each instance, the detailed behaviour of the film during growth and cycling can be derived.
34 citations
TL;DR: In this paper, a quantitative model of the intensities of electronic and ir active bands was developed to support this hypothesis, and significant differences in ir response in the 1000-6400 cm −1 region were observed and interpreted in terms of different film morphologies.
26 citations
TL;DR: In this paper, the mechanism of anionic electropolymerisation of [(vbpy)Re(CO)3Cl], where vbpy is 4-vinyl-4-methyl-2,2′-bipyridyl, has been studied with ellipsometry, and the nature of the film formed established.
Abstract: The mechanism of anionic electropolymerisation of [(vbpy)Re(CO)3Cl], where vbpy is 4-vinyl-4′-methyl-2,2′-bipyridyl, has been studied with ellipsometry, and the nature of the film formed established. The chemical transformations of this film on reduction to – 1.9 V have been studied by in situ FTIR spectroscopy in the presence and absence of CO2, and the spectra assigned using Timney's ligand effect parameters. This analysis shows that the reduction chemistry is somewhat simplified as compared to the homogeneous case studied earlier, with dimerisation of the reduction products much less prevalent. The films are highly active for CO2 reduction but show long-term degradation, and one possible mechanism for this is explored with a combination of ellipsometry and FTIR.
21 citations
TL;DR: In this paper, the potential distribution across the GaAs | electrolyte and Ga 1- x Al x As | interface was investigated using electroreflectance spectroscopy (EER) and electrode admittance measurements.
3 citations