This paper describes silica-coating of rod-structured nanoparticles composed of cadmium compounds, or quantum rods (QR), by means of a sol–gel method. QRs surface-modified with polyethyleneimine (PEI) (QR/PEI) had an average lateral size of 6.7 ± 0.9 nm and an average longitudinal size of 24.4 ± 2.5 nm. Silica-coated QR nanoparticles (QR/SiO2) were fabricated with a sol–gel process using water, sodium hydroxide, and tetraethylorthosilicate in ethanol in the presence of the QR/PEI nanoparticles. The QR/SiO2 nanoparticles were core-shell particles composed of the QRs as the core, the PEI as the matrix, and the silica as the shells. The colloid solution of QR/SiO2 nanoparticles showed more stable fluorescence to aging in a dark box in atmosphere at room temperature than that of QR/PEI nanoparticles.
Journal of Sol-Gel Science and Technology – Springer Journals
Published: May 15, 2018