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TEM focus series of gold nanoparticles deposited on a carbon membrane. The objective aperture size was (here ). (b) The minimum of contrast on the carbon film is taken as the zero defocus. The particle sizes were measured on this zero defocus image.
Phase information retrieved from image series. (a) Phase map derived from the series in Fig. 1 (b) Particles with phase below 0.5 rad consistent with a quantitative analysis. (c) Some particles with too high phase discarded from analysis as artifact due to dynamical effect. (d) Large particles (commercial sample) with phase allowing for MIP measurement.
MIP as a function of the particle size. The plot is obtained from measurement of the phase [Fig. 2(a)] and size using the TEM image [Fig. 1(b)]. About 300 particles were measured; the error bars are the standard deviation. Note that the main source of error is here the estimation of the height from the lateral size since the particles have some small deviation to spherical shape. The dotted line shows a function describing the evolution of the MIP (V in volts) as a function of size, d (nm).
High-resolution images of the gold nanoparticles revealing that the particle organization strongly depends on size. (a) Particle above 2 nm showing a fivefold symmetry axis consistent with a decahedral shape. (b) and (c) Particles below 2 nm with ill-defined shape and inner structure.
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