Esmaspäeval, 9. Aprillil 2018 kell 16.15 toimub Physicumis W.Ostwaldi 1 seminariruumis D312
Laserspektroskoopia seminar No 253
Esineb: Matas Janulevičius
Department of Analytical and Environmental Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania, matas.janulevicius [ät] chf.stud.vu.lt
Synthesis and Morphology Control of GdPO4 Particles via Hydrothermal Route
Development and improvement of nano- and micro- sized particles and structures has caught focus of scientists in recent years. Rare-earth doped –nano and –micro orthophosphate particles are promising materials for their chemical and thermal stability, luminescence properties, low toxicity and have wide field of applications such as luminescent phosphors, electronics, drug delivery, down/up-conversion materials, catalysis and bio-applications.
Controllable size and morphology is important aspect of this research area, responsible for unique luminescent and physical properties (density, specific area, solubility, stability, reactivity, zeta-potential) of sintered particles. Synthesis of various LnPO4 particles has been studied extensively lately and various morphologies such as nanorods, nanowires, nanofibers, nanocubes, microspheres are reported. Yet, effectiveness in synthesis of LnPO4 particles with an aim to obtain desired morphology, narrow distribution in size, good dispersability in various solvents is still to be improved.
Herein, we report hydrothermal synthesis route of GdPO4 particles assisted by tartaric acid as a coordinating agent. Several different morphologies such as nanofiber, nanorods, nanoprisms, microspheres were synthesized. Obtained particles are uniform, well-shaped and comparatively small-sized (see Fig. 1). Dispersions of GdPO4 samples remained stable for months. Some properties of sintered particles and the impact of synthesis conditions upon particle phase and morphology were investigated and is discussed in this work.
Further tasks are formulated as follows:
- Synthesis and investigaion of PL properties of Nd3+, Dy3+, Yb3+/Er3+ doped phosphate particles;
- Attempt to modify particle surface with ADCs (Antibody-drug conjugates).
Figure 1. SEM images of GdPO4 particles. Images represent NH4H2PO4/Gd3+ molar ratio impact upon particle morphology: (a) 1, (b) 4, (c) 7, (d) 10, (e) 20, (f) 50, (g) 75 and (h) 100 respectively.
Kõikide huviliste osavõtt oodatud! Teate edastab I. Sildos 5. aprillil 2018 a.