@article{oai:kutarr.kochi-tech.ac.jp:00000213,
 author = {Wang, Pengyu and Yokoyama, Kazuya and Konishi, Tomoya and Nishiwaki, Nagatoshi and Kobiro, Kazuya},
 journal = {The Journal of Supercritical Fluids},
 month = {},
 note = {Rare earth doped spherical mesoporous metal oxide nanospheres with upconversion emission ability and large surface area were successfully synthesized by a rapid one-pot single-step method. The reaction medium comprised supercritical methanol with carboxylic acid as an organic additive. Mesoporous Er doped CeO_2 and Er and Yb co-doped CeO_2 nanospheres emit green light under even low-power IR laser irradiation (980 nm, 10 mW) without calcination. Stronger intensity was achieved by high-temperature calcination. Spherical mesoporous nanoparticles were successfully doped with other metals and nitrogen to form TiO_2:Eu, TiO_2:Ce, TiO_2:Yb, TiO_2:Fe, and TiO2:N according to the similar procedure combining supercritical methanol.},
 pages = {71--77},
 title = {Ultimately Simple One-pot Single-step Synthesis of Rare Earth Doped Spherical Mesoporous Metal Oxide Nanospheres with Upconversion Emission Ability in Supercritical Methanol},
 volume = {80},
 year = {2013}
}