title: Maghemite (hematite) core (shell) nanorods via thermolysis of a molecular solid of Fe-complex.
abstract: An Fe-metal complex with 2'-hydroxy chalcone (2'-HC) ligands [Fe(III) (2'-hydroxy chalcone)(3)] is synthesized by a chemical route and is subjected to different thermal treatments. Upon thermolysis in air at 450 °C for 3 h the complex yields maghemite (γ-Fe(2)O(3)) nanorods with a thin hematite (α-Fe(2)O(3)) shell. X-Ray diffraction (XRD), Mössbauer spectroscopy, diffuse reflectance spectroscopy (UV-DRS), high resolution transmission electron microscopy (HR-TEM), field emission scanning electron microscopy (FE-SEM) and vibrating sample magnetometry (VSM) are used to characterize the samples. The stability of the ligand and the Fe-complex is further examined by using thermogravimmetric/differential thermal analysis (TGA/DTA). We suggest a residual ligand controlled mechanism for the formation of an anisotropic nanostructure in a crumbling molecular solid undergoing ligand decomposition. Since the band gap of iron oxide is in the visible range, we explored the use of our core shell nano-rod sample for photocatalytic activity for H(2) generation by H(2)S splitting under solar light. We observed high photocatalytic activity for hydrogen generation (75 ml h(-1)).
authors: Center for Materials for Electronics Technology, Department of Information Technology, Govt. Of India, Panchwati, Off Pashan Road, Pune, 411 008, Pune, India.
authors: N S
authors: NS
authors: Chaudhari
authors: S S
authors: SS
authors: Warule
authors: S
authors: S
authors: Muduli
authors: B B
authors: BB
authors: Kale
authors: S
authors: S
authors: Jouen
authors: B
authors: B
authors: Lefez
authors: B
authors: B
authors: Hannoyer
authors: S B
authors: SB
authors: Ogale
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D006358:Hot Temperature; D007501:Iron / Q000737:chemistry*; D008027:Light; D046529:Microscopy, Electron, Transmission; D008958:Models, Molecular; D043942:Nanotubes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D009942:Organometallic Compounds; C000499:ferric oxide; D007501:Iron