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Formation of Iron-oxide Nanorods on the Surface of Silicon by Using Annealing Technique
Nitin Rawat,Sarita Kumari,Rajesh Kumar 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.12
In this article, we report the synthesis of iron-oxide nanorods on silicon (Si) substrates. The nanorods were formed by annealing an iron chloride solution on the surface of a Si at 950 C in the presence of a reducing gas (H2) and a diluting gas (Ar). The surface morphologies of the nanorods were investigated by using field-emission scanning electron microscopy, and their compositions and structural characterization were investigated by elemental using energy dispersive X-ray spectroscopy and high-resolution transmission electron microscopy (HRTEM), respectively. The HRTEM study shows a crystalline formation of the nanorods. The electron diffraction pattern along the viewing (111) direction and the HRTEM result shows an interplanar distance equal to 2.17 °A, which is nearly equal to the standard value 2.3 °A of FeO. The as-fabricated nanorods can be used for many technological applications.
Controlling Band Gap and Refractive Index in Dopant-Free α-Fe2O3 Films
Pawan Kumar,Nitin Rawat,Da-Ren Hang,이흥노,Rajesh Kumar 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Dopant-free hematite (α-Fe2O3) films are formed at a liquid-vaporinterface by means of an easy method in order to control the bandgap and refractive index of the films. The α-Fe2O3 films after beingtransferred to a glass substrate are studied for their structural andoptical properties. Control over the thickness of the films in therange from 75 to 400 nm and the constituent nanocrystallite sizefrom 3 to 46 nm is achieved by controlling the synthesisparameters. By controlling the film thickness, crystallite size, andcrystallinity of dopant-free α-Fe2O3 films, the optical band gap isincreased significantly (by ≈ 0.64 eV) from 2.30 to 2.94 eV, alongwith increase in the refractive index from 1.35 to 2.8. Theobserved increase in the optical band gap is explained on thebasis of change in lattice symmetry (via change in the c/a ratio) ofα-Fe2O3 crystallites.
Pharmacognostic Evaluation of Curcuma aeurigenosa Roxb.
Sharad Srivastava,Nitin Chitranshi,Sanjay Srivastava,Mathew Dan,AKS Rawat,Palpu Pushpangadan 한국생약학회 2006 Natural Product Sciences Vol.12 No.3
aeruginosa Roxb. (FamilyZingeberaceae), comonly known as “pink and blue ginger” iscultivated in southern India. The plant is distinguished by red corolla lobes and ferruginous or greenish-bluerhizome. Rhizoma is used medicinally as anti-diarrheal, anti-fungal; external use as astringent for wounds. Adetailed pharmacognostic evaluation of its rhizome showed total ash 6.1%, acid insoluble ash 1.20%, alcoholsoluble extractives 3.70%, water soluble extractives 14.50%, sugar 20.93%, starch 41.85%, and tannins 0.68%.On hydro distillation, the rhizomes and sesile tubers yielded 0.17% oil.KeywordsCurcuma aueriginosa, rhizome, pharmacognosy, standardization