NDLI: Interplay Between Size and Crystal Structure of Molybdenum Dioxide Nanoparticles—Synthesis, Growth Mechanism, and Electrochemical Performance

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Interplay Between Size and Crystal Structure of Molybdenum Dioxide Nanoparticles—Synthesis, Growth Mechanism, and Electrochemical Performance

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Interplay Between Size and Crystal Structure of Molybdenum Dioxide Nanoparticles—Synthesis, Growth Mechanism, and Electrochemical Performance

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Koziej, Dorota Rossell, Marta D. Ludi, Bettina Hintennach, Andreas Novák, Petr Grunwaldt, Jan-Dierk Niederberger, Markus
Description	Country affiliation: United States Author Affiliation: Koziej D ( Harvard University, School of Engineering and Applied Science, 29 Oxford Street, Cambridge, MA 02138, USA. koziejd@seas.harvard.edu)
Abstract	A detailed study is presented on the formation of $MoO_{2}$ nanoparticles from the dissolution of the precursor to the final rodlike product, with a focus on the exploration of the inorganic reaction occurring ahead of the nucleation step, and interplay between size and crystal structure of $MoO_{2}.$ In situ X-ray absorption spectroscopy experiments show that the crystallization and the growth process of $MoO_{2}$ nanorods is initiated by rapid reduction of the $MoO_{2}Cl_{2}$ precursor in benzyl alcohol and acetophenone. This reaction triggers the nucleation of 2 nm $MoO_{2}$ particles with spherical shape and hexagonal crystal structure. The transformation from spheres into rods emerges as a complex process driven by oriented attachment. High-resolution transmission electron microscopy and X-ray diffraction results provide evidence that the 2 nm particles first aggregate into 5–20 nm-large oriented assemblies. The increase in particle size induces the phase transition from hexagonal to the less symmetrical monoclinic crystal structure, and finally the transformation into rods. Is it shown that electrodes for lithium-ion batteries based on $MoO_{2}$ nanorods have a long-term cycling life. The specific discharge capacity even after 200 cycles at a discharge rate of 1 C is about 300 Ah $kg^{−1}.$
File Format	HTM / HTML
ISSN	16136810
Issue Number	3
Volume Number	7
e-ISSN	16136829
Journal	Small
Language	English
Publisher	Wiley-VCH
Publisher Date	2011-02-07
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Nanotechnology Molybdenum Chemistry Nanoparticles Oxides Electrochemistry Microscopy, Electron, Scanning Ultrastructure Nanotechnology Nanotubes X-ray Absorption Spectroscopy Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Medicine Biomaterials Engineering Biotechnology

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Interplay Between Size and Crystal Structure of Molybdenum Dioxide Nanoparticles—Synthesis, Growth Mechanism, and Electrochemical Performance

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Interplay Between Size and Crystal Structure of Molybdenum Dioxide Nanoparticles—Synthesis, Growth Mechanism, and Electrochemical Performance