Water-soluble poly(allylamine) Mn-doped Si (Si) nanoparticles (NPs) were prepared and show promise for biologically related applications. The nanoparticles show both strong photoluminescence and good magnetic resonance contrast imaging. The morphology and average diameter were obtained through transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM); spherical crystalline Si NPs with an average diameter of 4.2 ± 0.7 nm were observed. The doping maximum obtained through this process was an average concentration of 0.4 ± 0.3% Mn per mole of Si. The water-soluble Si NPs showed a strong photoluminescence with a quantum yield up to 13%. The Si NPs had significant contrast with an relaxivity of 11.1 ± 1.5 mM s and relaxivity of 32.7 ± 4.7 mM s where the concentration is in mM of Mn. Dextran-coated poly(allylamine) Si NPs produced NPs with and contrast with a relaxivity of 27.1 ± 2.8 mM s and relaxivity of 1078.5 ± 1.9 mM s. X-band electron paramagnetic resonance spectra are fit with a two-site model demonstrating that there are two types of Mn in these NP's. The fits yield hyperfine splittings () of 265 and 238 MHz with significant zero field splitting ( and terms). This is consistent with Mn in sites of symmetry lower than tetrahedral due to the small size of the NP's.
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| http://dx.doi.org/10.1021/acs.jpcc.6b11000 | DOI Listing |
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