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Báo cáo hóa học: " Hydrothermal synthesis of amorphous MoS2 nanofiber bundles via acidification of ammonium heptamolybdate tetrahydrate"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hydrothermal synthesis of amorphous MoS2 nanofiber bundles via acidification of ammonium heptamolybdate tetrahydrate | Nanoscale Res Lett 2007 2 461-468 DOI 10.1007 s11671-007-9087-z NANO EXPRESS Hydrothermal synthesis of amorphous MoS2 nanofiber bundles via acidification of ammonium heptamolybdate tetrahydrate G. Nagaraju C. N. Tharamani G. T. Chandrappa J. Livage Received 16 March 2007 Accepted 10 August 2007 Published online 1 September 2007 to the authors 2007 Abstract MoS2 nanofiber bundles have been prepared by hydrothermal method using ammonium molybdate with sulfur source in acidic medium and maintained at 180 C for several hours. The obtained black crystalline products are characterized by powder X-ray diffraction PXRD Fourier transform infrared spectrometer FTIR X-ray photoelectron spectroscopy XPS scanning electron microscopy SEM and transmission electron microscopy TEM . The PXRD pattern of the sample can be readily indexed as hexagonal 2H-MoS2. FTIR spectrum of the MoS2 shows the band at 480 cm- corresponds to the 7as Mo-S . SEM TEM images of the samples exhibit that the MoS2 nanofiber exist in bundles of 120-300 nm in diameter and 20-25 m in length. The effects of temperature duration and other experimental parameters on the morphology of the products are investigated. Keywords Hydrothermal Nanofiber bundles MoS2 Citric acid G. Nagaraju G. T. Chandrappa El Department of Chemistry Central College Campus Bangalore University Bangalore 560001 India e-mail gtchandrappa@yahoo.co.in C. N. Tharamani Department of Chemistry University of Saskatchewan Saskatoon Canada SK s7n 5C9 J. Livage Laboratoire Chimie de la Matiere Condensee Universite Pierre et Marie Curie 4 place Jussieu Paris cedex 05 75252 France Introduction Nowadays one-dimensional nanostructural materials nanorods nanowires nanobelts and nanotubes have attracted heightened attention because of their potential applications in nanodevices and functional materials 1 . Continuous effort has been devoted to the investigation on the crystalline phases of the layered transition metal dichalcogenides because of their .