Simple manufacturing and metal type-dependent properties of M3 (OH)2 V2 O7·n H2 O (M; Co, Ni, Cu, Zn) nanostructures
[ X ]
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Iranian Chemical Society
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
M3 (OH)2 V2 O7·nH2 O (M: Co, Ni, Cu, Zn) nanostructures were synthesized by a simple and economic chemical precipitation route. For Co and Ni compounds, very small (~9 nm), irregularly shaped and poor crystalline nanoparticles occurred, probably due to high tendency for complexing with ammonia molecules releasing from ammonium metavanadate. However, more crystalline Co compounds could be synthesized in high reactant concentrations, but not for Ni. Zn and Cu compounds are well crystallized in the hexagonal and monoclinic unit cell, respectively. Their shapes were nanoflake or nanoplate and their thickness were about 20 nm and 25 nm, respectively. Both have an average diameter of less than 500 nm. The chemical formulas determined were Co3 V2 O7 (OH)2·2.8H2 O, Ni3 V2 O7 (OH)2·5.6H2 O, Cu3 V2 O7 (OH)2·2H2 O and Zn3 V2 O7 (OH)2·2.8H2 O. The band gaps of samples were found in the range from 3.22 to 4.34 eV. Magnetic measurements show that all Co samples have a magnetic transition from ferromagnetic (FM) to paramagnetic (PM) around 300 K, on the ground that samples with FM characteristics and coupling at 5 K temperature turn into PM samples at room temperature. These results are important for large-scale synthesis of nanovanadate structures. © 2020, Iranian Chemical Society. All rights reserved.
Açıklama
Anahtar Kelimeler
Co, Cu, Nanovanadates, Ni, Zn
Kaynak
Nanochemistry Research
WoS Q Değeri
Scopus Q Değeri
Q3
Cilt
5
Sayı
2
