UV/vis/NIR spectra were recorded at a Jasco V-670 (US-MD) with
a temperature control unit. Nanoparticle solutions were dissolved
10 times with the respective surfactant to reduce extinction. TEM
images were obtained with a LEO CEM902 operating at an acceleration
voltage of 80 kV and with a LEO 922 OMEGA EFTEM with an acceleration
voltage of 200 kV from Zeiss (Germany). Zero-loss filtered images
were recorded using a bottom mounted Ultrascan 1000 (Gatan) CCD camera
system. Gatan Digital Micrograph 3.9 for GMS 1.4 software was used
for image acquisition. For TEM analysis 1 mL of nanoparticle solutions
were concentrated to 100 μL via centrifugation and washed twice
to adjust the surfactant concentration to 1 mM. 5 μL of the
as-prepared solution was dried on Quantifoil 300 mesh copper grid
with carbon films. Measurements performed for edge sharpening evaluation
(Figure4 ) were prepared under a N2 environment. For size evaluation the software ImageJ (version 1.44p,
U.S. National Institutes of Health) was used.
a temperature control unit. Nanoparticle solutions were dissolved
10 times with the respective surfactant to reduce extinction. TEM
images were obtained with a LEO CEM902 operating at an acceleration
voltage of 80 kV and with a LEO 922 OMEGA EFTEM with an acceleration
voltage of 200 kV from Zeiss (Germany). Zero-loss filtered images
were recorded using a bottom mounted Ultrascan 1000 (Gatan) CCD camera
system. Gatan Digital Micrograph 3.9 for GMS 1.4 software was used
for image acquisition. For TEM analysis 1 mL of nanoparticle solutions
were concentrated to 100 μL via centrifugation and washed twice
to adjust the surfactant concentration to 1 mM. 5 μL of the
as-prepared solution was dried on Quantifoil 300 mesh copper grid
with carbon films. Measurements performed for edge sharpening evaluation
(Figure
U.S. National Institutes of Health) was used.