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Issue 2, 2019
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Bi2SiO5@g-SiO2 upconverting nanoparticles: a bismuth-driven core–shell self-assembly mechanism

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Abstract

Core–shell systems have attracted increasing interest among the research community in recent years due to their unique properties and structural features, and the development of new synthetic strategies is still a challenge. In this work, we have investigated lanthanide-doped Bi2SiO5 nanocrystal formation inside mesoporous silica nanoparticles (MSNs). The role of both synthesis temperature and concentration of the bismuth precursor impregnated into the MSNs is discussed, showing an unprecedented strategy for the simultaneous stabilization of a crystalline core and a glassy shell. Temperature dependent synchrotron radiation X-ray powder diffraction (SR-XRPD) and high resolution transmission electron microscopy (HR-TEM) analyses allow one to follow the crystalline core growth. A mechanism for the formation of a Bi2SiO5@g-SiO2 core–shell nanosystem is proposed. In addition, the easy tunability of the color output of the upconverting system is demonstrated by means of suitable doping lanthanide ions with potential applications in several fields.

Graphical abstract: Bi2SiO5@g-SiO2 upconverting nanoparticles: a bismuth-driven core–shell self-assembly mechanism

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Publication details

The article was received on 26 Oct 2018, accepted on 03 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR08649D
Citation: Nanoscale, 2019,11, 675-687

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    Bi2SiO5@g-SiO2 upconverting nanoparticles: a bismuth-driven core–shell self-assembly mechanism

    M. Back, E. Trave, G. Zaccariello, D. Cristofori, P. Canton, A. Benedetti and P. Riello, Nanoscale, 2019, 11, 675
    DOI: 10.1039/C8NR08649D

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