| Summary: | 碩士 === 國立中正大學 === 化學暨生物化學研究所 === 101 === We demonstrate a series of nanosyntheses for several interesting nanostructures based on the selenium nanobrush (SeNB), including (i) the core-shell selenium nanobrush-silica (SeNB-SiO2) particles with controllable shell thickness, (ii) hollow silica nanobrush particles (hSiO2NB), (iii) core-shell gold-selenium and silver-selenium nanobrush-silica particles (AuSeNB-SiO2 and AgSeNB-SiO2), and (iv) gold nanoparticles or silver selenide nanoparticles nanoparticles decorated hollow silica nanobrush composites (AuNP-hSiO2NB and Ag2SeNP-hSiO2NB).
The coating of silica for SeNB-SiO2 core-shell nanostructures with various shell thickness was conducted via a well-known sol-gel method and the thickness was controlled up to 15 nm for our needs. The length of the SeNB used ranging from 80 nm to ca. 2500 nm. These core-shell nanostructures served as the starting materials for subsequent syntheses. We demonstrate that by selectively removing the core SeNB we were able to obtain high yields and well dispersed hSiO2NB particles. The Se removal was achieved via two different ways: physical heating and chemical reduction methods. The final products of the hSiO2NB usually retain their brush-like interior structure except those with very thin silica. We also demonstrate a synthetic route utilizing spontaneous and selective redox reaction between elemental Se on the surface of SeNB and several metal ions, such as Au3+ and Ag+. It resulted in the formation of AuSeNB-SiO2 and AgSeNB-SiO2. We can then move a step forward to remove the remaining Se in the above structures by the use of chemical reduction method. High yields of nanoparticles decorated hSiO2NB can thus be obtained, such as AuNP-hSiO2NB and Ag2SeNP-hSiO2NB.
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