Open Access Nano Express

Hydrothermal synthesis of amorphous MoS2nanofiber bundles via acidification of ammonium heptamolybdate tetrahydrate

G Nagaraju1, CN Tharamani2, GT Chandrappa1* and J Livage3

Author Affiliations

1 Department of Chemistry, Central College Campus, Bangalore University, Bangalore, 560001, India

2 Department of Chemistry, University of Saskatchewan, Saskatoon, Canada, SK S7N 5C9

3 Laboratoire Chimie de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, Paris cedex 05, 75252, France

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Nanoscale Research Letters 2007, 2:461-468  doi:10.1007/s11671-007-9087-z

Published: 1 September 2007

Abstract

MoS2nanofiber 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 MoS2shows the band at 480 cm−1corresponds to the γas(Mo-S). SEM/TEM images of the samples exhibit that the MoS2nanofiber exist in bundles of 120–300 nm in diameter and 20–25 μm 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