In Situ Topotactic Synthesis of Monodispersed Hierarchically Nanostructured Yttrium‐Based Microspindles from a Mesocrystal Precursor

Abstract

Monodispersed hierarchically nanostructured yttrium‐based materials including Y(OH)3, Y6O5F8, and H‐NaYF4 were successfully synthesized from the same mesocrystal Y(OH)xF3–x precursor. It was found that there was a close crystallographic relationship between the precursor and the final products and all of the processes underwent an in situ topotactic transformation.

Carbon Dots in Hydroxy Fluorides: Achieving Multicolor Long-Wavelength Room-Temperature Phosphorescence and Excellent Stability via Crystal Confinement

“…Herein, we designed a simple and universal strategy to prepare CDs@YOHFs (including CDs-g, CDs-y, CDs-o) by a simple hydrothermal treatment (Figure a). First, the CDs were synthesized according to the methods in previous works (see the Experimental Section in the Supporting Information for details), and then the resulting CDs were added to the precursor solution of YOHF . In a hydrothermal environment, YOHF grew on the surface of CDs as seeds, and confined the CDs in situ in its internal nanospaces.…”

“…First, the CDs were synthesized according to the methods in previous works (see the Experimental Section in the Supporting Information for details), and then the resulting CDs were added to the precursor solution of YOHF. 59 In a hydrothermal environment, YOHF grew on the surface of CDs as seeds, and confined the CDs in situ in its internal nanospaces. Finally, CDs@YOHFs with multicolor RTP and excellent stability were easily fabricated by the above method.…”

“…The corresponding HRTEM images exhibit apparent lattice fringes with interplanar spacings of 0.30 and 0.22 nm, which can be assigned to the (110) facet of YOHF and the (100) facet of graphite carbon for the embedded CDs. 32,59 The above results preliminarily indicate the successful synthesis of the CDs@YOHF composites. The Raman spectra of CDs-g and CDs-g@YOHF are shown in Figure S3.…”