| Abstract
| - A new method is described for surface functionalization of silicon nanocrystals. Organicmonolayers were self-assembled via gas-phase adsorption of amines, alkenes, alkynes, and aldehydesonto the surfaces of aerosolized crystalline silicon nanoparticles of 12.2 nm diameter in an atmosphericpressure tube reactor. Assembly took place within 4 s at temperatures between 200 and 500 °C. Theextent of adsorption was measured by using tandem differential mobility analysis (T-DMA), an on-linediagnostic method for measuring changes in particle size. Functionalized particles were further characterizedby high-resolution transmission electron microscopy and diffuse reflectance Fourier transform infraredspectroscopy. The apparatus described in this work can be used for continuous mass production offunctionalized silicon nanoparticles. Moreover, the overall strategy of using T-DMA for monitoring monolayeruptake could be generally applied to study surface processing of other aerosolized nanoparticle systems.
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