Controlled fabrication of macroscopic mesostructured silica spheres for potential diagnostics and sensing applications

Naqshbandi, M., Canning, J.,Lau, A.,Crossley, M.J.

Quantum Electronics Conference & Lasers and Electro-Optics（2011）

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摘要

We report on fabricating macro-scale mesostructured silica spheres on superhydrophobic surfaces from silica nanoparticles via evaporative self-assembly. The problem of cracking and shattering of the dried macro-spheres has been addressed by using dopants such as graphite, porphyrins and rhodamine-B as well as increasing the evaporation time by using anti-freeze. Limits in size reduction associated with hand-held deposition are overcome using ink-jet deposition - spheres <; 100 μm are routinely produced. Silica spheres doped with porphyrin and fluorescent dyes demonstrate an ability of functionalising these spheres to improve biocompatibility and allow fluorescent diagnostics.

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关键词

dyes,hydrophobicity,liquid phase deposition,nanofabrication,nanoparticles,self-assembly,silicon compounds,cracking,dried macrospheres,evaporation time,evaporative self-assembly,fluorescent diagnostics,fluorescent dyes,handheld deposition,inkjet deposition,macroscopic mesostructured silica spheres,optical fabrication,porphyrin,shattering,silica nanoparticles,size reduction,superhydrophobic surfaces,self assembly

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