Hydroxyapatite Nano- and Microcrystals with Multiform Morphologies: Controllable Synthesis and Luminescence Properties

• Published in: Crystal growth & design Vol. 9; no. 6; pp. 2725 - 2733
• Main Authors: Zhang, Cuimiao, Yang, Jun, Quan, Zewei, Yang, Piaoping, Li, Chunxia, Hou, Zhiyao, Lin, Jun
• Format: Journal Article
• Language: English
• Published: Washington,DC American Chemical Society 03.06.2009
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; Field emission, ionization, evaporation, and desorption; Materials science; Nanoscale materials and structures: fabrication and characterization; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Other topics in nanoscale materials and structures; Physics; Quantum wires; Fourier transform spectroscopy; Pressure effects; Crystal lattices; Carbon dioxide; Luminescence; Photoluminescence; Hydroxyapatite; Field emission; XRD; Microspheres; Optical properties; Calcium sulfide; Nanorod; Scanning electron microscopy; pH value; Citrates; Experimental result; Transmission electron microscopy; Hydrothermal synthesis; Morphology; Nanowires; Electron paramagnetic resonance; Microcrystal; Formation mechanism; Nanostructured materials
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/cg801353n

Hydroxyapatite (Ca5(PO4)3OH) nano- and microcrystals with multiform morphologies (separated nanowires, nanorods, microspheres, microflowers, and microsheets) have been successfully synthesized by a facile hydrothermal process. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL) spectra, kinetic decay, and electron paramagnetic resonance (EPR) were used to characterize the samples. The experimental results indicate that the obtained Ca5(PO4)3OH samples show an intense and bright blue emission under long-wavelength UV light excitation. This blue emission might result from the CO2 •− radical impurities in the crystal lattice. Furthermore, the organic additive (trisodium citrate) and pH values have an obvious impact on the morphologies and luminescence properties of the products to some degree. The possible formation and luminescent mechanisms for Ca5(PO4)3OH nano- and microcrystals are presented in detail.