Protein Adsorption on Titanium Dioxide: Effects on Double Layer and Semiconductor Space Charge Region Studied by EIS

OSVALDO R. CÁMARA; LUCÍA B. AVALLE; FABIANA Y. OLIVA

Elsevier

Lugar: Amsterdam; Año: 2010 vol. 55 p. 4519 - 4519

p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; LINE-HEIGHT: 200%; TEXT-ALIGN: justify">The semiconductor properties of an n-type TiO2 oxide surface and its modification by protein adsorption using electrochemical impedance spectroscopy (EIS) were studied.  Impedance spectra under steady state conditions were obtained as a function of electrode potential and human serum albumin (HSA) concentration in solution. The effect of the adsorption potential on the EIS response was also analyzed (Eads -0.70, -0.50 and -0.080 V vs. saturated calomel electrode). The impedance spectra were modeled using different equivalent circuits, and data analysis were performed by data fitting in the whole frequency range, as well as in the low and