Sodium peroxostannate nanoparticles with graded composition were produced from aqueous hydrogen peroxide-sodium hydroxostannate solution. The uniform particles were converted to composition graded sodium stannate by mild thermal treatment for peroxide decomposition and yielded yolk-shell tin dioxide particles by dilute acid treatment. The mechanism of formation of the graded sodium concentration is explained in view of the solubility of peroxostannate in H2O2-H2O solution and based on 119Sn NMR, XRD, dynamic light scattering (DLS) and electron microscopy studies. Initial studies illuminating sensitive hydrogen sensing by yolk-shell tin oxide particles are presented.
Bibliographical noteFunding Information:
This study was supported by the Russian Science Foundation, grants 17-73-10482 (material synthesis and characterization) and 16-13-00110 (solubility diagram and studies of particle formation and growth). We thank the Harvey M. Krueger Family Centre for Nanoscience and Nanotechnology of the Hebrew University of Jerusalem. This research was performed using the equipment of the JRC PMR IGIC RAS.
© The Royal Society of Chemistry 2017.