Pixis 400br excelon

First, the Te nanoparticle colloidal suspension prepared by ns-LAL was diluted with nine volumes of deionized water. Then, one drop of the solution was transferred to a piece of clean indium tin oxide glass. After the evaporation of water, the Te nanoparticles were marked by SEM. Any two nano-objects were separated with a distance of at least 1 μm to avoid interference between them. The backward scattering spectra of individual Te nanoparticles and their oligomers were obtained using a dark-field optical microscope (BX51, Olympus) integrated with a quartz tungsten halogen lamp (100 W), a monochromator (SpectraPro 2300i, Acton), and a charge-coupled device (CCD) camera (Pixis 400BR_eXcelon, Princeton Instruments). The CCD camera was thermoelectrically cooled to −70°C during the measurements. It should be noted that the quantum efficiency of the CCD dropped quickly near the UV range, so the measured scattering spectrum intensities decreased to nearly zero at λ = 400 nm. In the scattering measurements, an objective lens (100×; numerical aperture, 0.80) was used to illuminate Te nanoparticles with white excitation light. All the scattering experiments were carried out under the same temperature (25°C) in the dark environment. The scattering measurement process was discussed in our previous work (40 ).