Combination of iCVD and porous silicon for the development of a controlled drug delivery system

Steven McInnes, Endre Szili, Sameer Al-Bataineh, Jingjing Xu, Mariah Alf, Karen Gleason, Robert Short, Nicolas Voelcker

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    65 Citations (Scopus)


    We describe a pH responsive drug delivery system which was fabricated using a novel approach to functionalize biodegradeable porous silicon (pSi) by initiated chemical vapor deposition (iCVD). The assembly involved first loading a model drug (camptothecin, CPT) into the pores of the pSi matrix followed by capping the pores with a thin pH responsive copolymer film of poly(methacrylic acid-co-ethylene dimethacrylate) (p(MAA-co-EDMA)) via iCVD. Release of CPT from uncoated pSi was identical in two buffers at pH 1.8 and pH 7.4. In contrast, the linear release rate of CPT from the pSi matrix with the p(MAA-co-EDMA) coating was dependent on the pH; release of CPT was more than four times faster at pH 7.4 (13.1 nmol/(cm 2 h)) than at pH 1.8 (3.0 nmol/(cm 2 h)). The key advantage of this drug delivery approach over existing ones based on pSi is that the iCVD coating can be applied to the pSi matrix after drug loading without degradation of the drug because the process does not expose the drug to harmful solvents or high temperatures and is independent of the surface chemistry and pore size of the nanoporous matrix.

    Original languageEnglish
    Pages (from-to)3566-3574
    Number of pages9
    JournalACS Applied Materials & Interfaces
    Issue number7
    Publication statusPublished - 25 Jul 2012


    • drug release
    • iCVD
    • pH-responsive
    • porous silicon


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