Structural and Spectroscopic Studies of Hydroxyapatite Nanorods Formed via Microwave‐Assisted Synthesis Route
In the present investigation Hydroxyapatite [Ca10(PO4)6(OH)2:(HAp)] nanorods
were synthesized using microwave irradiation technique taking ethylene diamine tetra‐acetic acid as a complexing reagent. Hydroxyapatite precursor obtained using microwave irradiation was subjected to differential thermal analysis. Later it was calcined in the temperature range 450°C–900°C.
The crystal, grain, and bonding structures of resulting HAp were characterized structurally using X‐ray diffraction and scanning electron microscopy (SEM) techniques and spectroscopically using Fourier
transform infrared (FT‐IR) and Raman techniques. The structural and spectroscopic characterizations of precursor revealed the formation of hydrated HAp. SEM
images of the specimens calcined at 600°C and 900°C are presented. This study clearly reveals that nanorods are not formed below 700°C and nanorods are formed only after heat treatment of HAp precursor at 700°C and above. The diameter
of nanorods was estimated to be ~200 nm. No nanostructures were found to be formed if the precursor is calcined below 700°C. FT‐IR and Raman spectra of HAp samples obtained
after calcinations at 700°C and above further confirm the formation of HAp nanorods.