Open AccessSynthesis of Vanadium Oxide Nanofibers with Variable Crystallinity and V5+/V4+ Ratios
Author(s) -
R. Berenguer,
María Olga Guerrero-Pérez,
Isabel Niño de Guzmán,
José RodríguezMirasol,
Tomás Cordero
Publication year - 2017
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.7b01061
Subject(s) - crystallinity , materials science , nanofiber , vanadium oxide , calcination , crystallite , vanadium , annealing (glass) , electrospinning , orthorhombic crystal system , monoclinic crystal system , chemical engineering , oxide , analytical chemistry (journal) , nanotechnology , crystallography , crystal structure , composite material , polymer , chemistry , metallurgy , catalysis , organic chemistry , engineering
Tailoring the morphological, chemical, and physical properties of vanadium oxides (VOx) is crucial to optimize their performance in current and future applications. The present contribution proposes a new route to obtain VOx nanofibers with different V 4+ /V 5+ ratios and crystallinity. The method involves the exclusive electrospinning of water-free NH 4 VO 3 -saturated solutions including a reductant. Subsequent air-annealing under suitable conditions yields vanadium oxide fibers of 20-90 nm diameter and 10-50 m 2 /g surface area. The presence of the reductant gives rise to VOx nanofibers with a considerable proportion of V 4+ . Then, the right choice of the calcination heating rate and temperature permits to modify the V 4+ /V 5+ ratio as well as the crystalline phase and crystallite size of the fibers. With the proposed methodology, long-range continuous single-phase orthorhombic V 2 O 5 and monoclinic V 3 O 7 nanofibers are obtained.
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