Full text loading...
(a) TEM image of as-synthesized Co MNPs; [(b) and (c)] the STEM image of Co/P3HT hybrid film (15 vol % Co) (d) Chantrell’s fitting with experiment data of the composite film, the fitting gives the magnetic diameter of 7.6 nm with standard deviation of 0.6 nm; (e) the size distribution extracted from Chantrell’s fitting (Ref. 24) by assuming log-normal distribution; and [(f) and (g)] representative EDX spectra collected at points A and B in (c), respectively.
X-ray diffraction scans of Co MNPs, P3HT, and their composite film. Peaks (△) at 5.4°, 10.8°, and 16° correspond to (100), (200), and (300) -axis orientations of P3HT; and the peak (○) at 44.2° corresponds to the (221) crystallographic planes of .
(a) The dependence of resistance of the 12 vol % Co hybrid film on temperature is well-fitted to the fluctuation-induced tunneling (FIT) conduction model (adjusted ) at low temperature (nonlinear curve fitting using ORIGIN software), giving and . The turning point is due to the differential thermal expansion between cobalt and P3HT matrix. curves (, 2, and 3) for variable range hopping at are also plotted (inset) and these curves are a poor fit with significant deviation from the expected straight line. (b) The resistance change at 10 K of Co/P3HT hybrid composite film, for different nanoparticle concentrations, as a function of the externally applied magnetic field.
Article metrics loading...