RT journal article
T1 Transcription of nanofibrous cerium phosphate using a ph-sensitive lipodipeptide hydrogel template
A1 Llusar, Mario
A1 Escuder, Beatriu
A1 López Castro, Juan de Dios
A1 Trasobares Llorente, Susana
A1 Monrós, Guillermo
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
A2 Ingeniería Mecánica y Diseño Industrial
K1 transcription
K1 templating
K1 hydrogel
K1 cerium phosphate nanofibers
K1 hexagonal rhabdophane
K1 monazite
K1 FE-SEM
K1 TEM/HRTEM
K1 STEM-HAADF
K1 UV-photo-luminescence
AB A novel and simple transcription strategy has been designed for the template-synthesisof CePO4·xH2O nanofibers having an improved nanofibrous morphology using a pH-sensitivenanofibrous hydrogel (glycine-alanine lipodipeptide) as structure-directing scaffold. The phosphorylatedhydrogel was employed as a template to direct the mineralization of high aspect ratio nanofibrouscerium phosphate, which in-situ formed by diffusion of aqueous CeCl3 and subsequent drying (60 ◦C)and annealing treatments (250, 600 and 900 ◦C). Dried xerogels and annealed CePO4 powders werecharacterized by conventional thermal and thermogravimetric analysis (DTA/TG), and Wide-AngleX-ray powder diffraction (WAXD) and X-ray powder diffraction (XRD) techniques. A molecularpacking model for the formation of the fibrous xerogel template was proposed, in accordance withresults from Fourier-Transformed Infrarred (FTIR) and WAXD measurements. The morphology,crystalline structure and composition of CePO4 nanofibers were characterized by electron microscopytechniques (Field-Emission Scanning Electron Microscopy (FE-SEM), Transmission ElectronMicroscopy/High-Resolution Transmission Electron Microscopy (TEM/HRTEM), and ScanningTransmission Electron Microscopy working in High Angle Annular Dark-Field (STEM-HAADF))with associated X-ray energy-dispersive detector (EDS) and Scanning Transmission ElectronMicroscopy-Electron Energy Loss (STEM-EELS) spectroscopies. Noteworthy, this templatingapproach successfully led to the formation of CePO4·H2O nanofibrous bundles of rather co-alignedand elongated nanofibers (10–20 nm thick and up to ca. 1 µm long). The formed nanofibersconsisted of hexagonal (P6222) CePO4 nanocrystals (at 60 and 250 ◦C), with a better-grown andmore homogeneous fibrous morphology with respect to a reference CePO4 prepared under similar(non-templated) conditions, and transformed into nanofibrous monoclinic monazite (P21/n) around600 ◦C. The nanofibrous morphology was highly preserved after annealing at 900 ◦C under N2,although collapsed under air conditions. The nanofibrous CePO4 (as-prepared hexagonal and900 ◦C-annealed monoclinic) exhibited an enhanced UV photo-luminescent emission with respect tonon-fibrous homologues.
PB MDPI
SN 2310-2861
YR 2017
FD 2017
LK http://hdl.handle.net/10498/36480
UL http://hdl.handle.net/10498/36480
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026