Size Control of Porous Silicon-Based Nanoparticles via Pore-Wall Thinning

Langmuir : the ACS Journal of Surfaces and Colloids
Emilie SecretJennifer S Andrew

Abstract

Photoluminescent silicon nanocrystals are very attractive for biomedical and electronic applications. Here a new process is presented to synthesize photoluminescent silicon nanocrystals with diameters smaller than 6 nm from a porous silicon template. These nanoparticles are formed using a pore-wall thinning approach, where the as-etched porous silicon layer is partially oxidized to silica, which is dissolved by a hydrofluoric acid solution, decreasing the pore-wall thickness. This decrease in pore-wall thickness leads to a corresponding decrease in the size of the nanocrystals that make up the pore walls, resulting in the formation of smaller nanoparticles during sonication of the porous silicon. Particle diameters were measured using dynamic light scattering, and these values were compared with the nanocrystallite size within the pore wall as determined from X-ray diffraction. Additionally, an increase in the quantum confinement effect is observed for these particles through an increase in the photoluminescence intensity of the nanoparticles compared with the as-etched nanoparticles, without the need for a further activation step by oxidation after synthesis.

References

Apr 5, 2007·Journal of the American Chemical Society·Zhenhui KangShuit-Tong Lee
Jan 3, 1992·Science·J L HeinrichK L Kavanagh
Jul 26, 2008·Nature Nanotechnology·Yimin ChaoBenjamin R Horrocks
Feb 24, 2009·Nature Materials·Ji-Ho ParkMichael J Sailor
Mar 3, 2009·Biomaterials·Suet P LowKeryn A Williams
Jul 3, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Emilie SecretBenoit Coasne
Jan 1, 2004·Nano Letters·Austin M DerfusSangeeta N Bhatia

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