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Evidence by Electrochemical Impedance Spectroscopy of Surface States Mediated SiMo12O404− Reduction at an n-InP Electrode

“…Note that X-ray photoelectron spectroscopy (XPS) analyses performed after SiMo 12 reduction have shown that no species are adsorbed on the InP surface. 4 At potentials more negative than -0.5 V/MSE, there is a large increase in the so-called C p capacitance in the equivalent circuit analysis (Figure 2D). It means that an additional capacitance C ss * lies in parallel with the space-charge capacitance C sc .…”

“…This shift that is potential-dependent is ascribed to surface state charging. Note that X-ray photoelectron spectroscopy (XPS) analyses performed after SiMo 12 reduction have shown that no species are adsorbed on the InP surface …”

“…For a better control of the etching process, it is essential to know the reaction mechanism and then the relevant experimental parameters. Recently, it was shown that n-InP could be selectively, with respect to p-InP, photoetched under open circuit conditions using an unusual oxidizing agent, namely, the dodecamolybdosilicate Keggin-type heteropolyanion (HPA), α-SiMo 12 O 40 4− . , This compound (noted SiMo 12 ) is able to capture a large number of electrons compensated, in acidic solution, by a protonation process.…”

XPS and RBS characterizations of electrosynthesized polypyrrole films doped with a heteropolyanion, SiMo12O404−

“…Indeed, the curve-fitting was accomplished using the parameters obtained for the fit of the Mo 3p 1/2 peak (not shown), which was performed using two components, the main one being due to Mo 6C and a small one at the lower binding energy attributed are reduced to Mo 5C . 8 Taking into account the parameters obtained from the fit of the Mo 3p 1/2 peak, the binding energies for the Mo 3p 3/2 contributions were fixed at 17.5-eV lower binding energy 9 and the peak area was multiplied by 2. After the removing of the Mo 3p 3/2 contributions from the experimental peak obtained in the energy range 394-404 eV, the resultant envelop was assigned to the N contributions and was decomposed into three components: 10,11 neutral N due to the Py ring (-NH-) at 400.0 š 0.…”