Positron Lifetime Spectroscopy of Silicon Nanocontainers for Cancer Theranostic Applications

Abstract

Biocompatibility and biodegradability of porous silicon (por-Si) nanoparticles (NPs), as well as the fact that they can selectively accumulate in tumor tissues, allow using them as containers for delivery of diagnostic markers or drugs for therapy of cancer tumors. Advantages of por-Si NPs as carriers of drugs are also favorable due to the high surface area and large pore volume. To apply por-Si NPs as nanocontainers it is necessary to have the comprehensive information about their porosity. In our work we use the positron annihilation lifetime (PAL) spectroscopy for porosity investigation. Samples of por-Si were prepared by electrochemical etching of heavily boron doped crystalline Si wafers in a hydrofluoric acid solution. The prepared por-Si films were dried and mechanically milled to obtain powder of NPs, which was pressed into tablets for PAL investigation. Ortho-positronium components of the measured positron lifetime spectra allowed us to evaluate the pore size distribution in por-Si NPs as continuous bimodal one with two peaks near 1 nm and 3 nm.

Solid State Chemistry: Computational Chemical Analysis for Materials Science

“…If the thermalised positron is in the vicinity of an electron, the two charged particles will be attracted by their electrostatic charges instead of being annihilated, hence forming a positronium. [74] From a computational point of view, it is possible to employ a two-component generalization of the Density Functional Theory (TCDFT), to probe the positron state and annihilation characteristics. The positron-electron correlation-energy functional is usually calculated on the limit of the vanishing positron density.…”