All gold hydrosols were characterized using a Perkin-Elmer
25 UV-vis spectrometer in the wavelength range from 350 to 800
nm, with a resolution of 1 nm. A “FEI 120 KV Tecnai G2 Sprint
BioTwin” transmission electron microscope (TEM) was used to
take several pictures of each batch of particles. The diameter of
at least 100 particles of each batch was determined from these
TEM images to characterize the size distribution of the particles.
Figure 1 shows the size distribution of GNPs having an average
size of 60 ( 9 nm together with a typical TEM image as an inset.
The Feret diameter of the particles, i.e., the diameter of a sphere
having the equivalent surface area, was determined automatically
using “Immage Tool” software. The elongation of the particles,
i.e., the ratio of the long to the short axes, was typically between
1.05 and 1.25. The particles can therefore be described as spherical
in good approximation.
All gold hydrosols were characterized using a Perkin-Elmer
25 UV-vis spectrometer in the wavelength range from 350 to 800
nm, with a resolution of 1 nm. A “FEI 120 KV Tecnai G2 Sprint
BioTwin” transmission electron microscope (TEM) was used to
take several pictures of each batch of particles. The diameter of
at least 100 particles of each batch was determined from these
TEM images to characterize the size distribution of the particles.
Figure 1 shows the size distribution of GNPs having an average
size of 60 ( 9 nm together with a typical TEM image as an inset.
The Feret diameter of the particles, i.e., the diameter of a sphere
having the equivalent surface area, was determined automatically
using “Immage Tool” software. The elongation of the particles,
i.e., the ratio of the long to the short axes, was typically between
1.05 and 1.25. The particles can therefore be described as spherical
in good approximation.
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