Beilstein J. Nanotechnol.2023,14, 1085–1092, doi:10.3762/bjnano.14.89
experiments.
Concurrently with the determination of the film thickness via ex situ measurements, the film growth upon cycling precursor pulses and purge periods was monitored in real time. The in situ monitoring helped in the visualization of the stepwisegrowth process (Figure 2). One can see that the
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Figure 1:
Dependence of SnO2 film GPC on the evaporation temperature of the SnI4 precursor. The cycle times w...
Beilstein J. Nanotechnol.2019,10, 2410–2421, doi:10.3762/bjnano.10.231
followed by a stepwisegrowth of these particles without a purification step, where in each step equal volumes of tetraethyl orthosilicate and ammonia water are added, while the volumes of cyclohexane and the surfactant Igepal® CO-520 are increased so that the ammonia water and surfactant concentrations
stepwisegrowth, falls below −40 mV, the particles can be dispersed in an ammoniacal ethanol solution and grown further by the continuous addition of tetraethyl orthosilicate to a diameter larger than 500 nm. Due to the high colloidal stability, a coalescence of the particles can be suppressed, and single
-core particles are obtained. This strategy can be easily transferred to other nanomaterials for the design of plasmonic nanoconstructs and sensor systems.
Keywords: reverse microemulsion; silica coating; stepwisegrowth; thick shells; upconversion nanoparticles; Introduction
Lanthanide-based
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Figure 1:
TEM images of (A) NaYF4:(Yb,Er) cores (C1; diameter: 24 ± 1 nm) and (B) the same core after coating...