Study of the electrical conductivity and piezoelectricity in iron doped collagen films

摘要

In this paper we did a study of collagen membranes prepared with iron as an impurity. In this study one try to understand the function of the iron in the collagen structure in view of increasing the value of piezoelectric strain tensor element d_(14). We prepared different samples with different iron doping levels. One has samples doped by immersion in solutions of FeCl_2 at 0.1 M and 0.2 M (ColFeCl01 and ColFeCl02) and iron doped directly in solution with Fe_2O_3 at 5% and 15% (Col7Fe5 and Col7Fe15). We did a study of the Mossbauer spectroscopy, DC electrical conductivity and the piezoelectric strain tensor element d_(14), the elastic constant s_955), and the dielectric function ε_(11) of the samples. The loss factor Q~(-1) of the samples was also measured using the admittance resonance method. The role played by the iron in the different situations and the consequences for the transport properties is discussed.