Structural characterization and properties of nanocrystalline Sn_1−xCo_xO₂ based dilute magnetic semiconductors

Abstract

Monophasic Sn 1Àx Co x O 2 (x 5 0.05, 0.10, and 0.15) nanoparticles with tetragonal structure have been successfully synthesized by solvothermal method using oxalate precursor route. Powder x-ray diffraction and selected area electron diffraction studies confirmed highly crystalline cassiterite SnO 2 structure. The contraction of lattice constants confirmed the incorporation of Co 21 in SnO 2 host lattice. Hexagonal nanoparticles with average grain size of 8-13 nm have been formed. With the increasing Co content, the decreasing crystallite size of SnO 2 with increasing surface areas from 194 to 219 m 2 /g was found. The percentage reflectance increases on increasing the cobalt concentration, and a noticeable blue shift appeared. The band gap was found to be 3.85, 3.91, and 4.09 eV, respectively. Co-doped SnO 2 showed distinct magnetic behavior with different Co 21 concentration. For x 5 0.05 and 0.10, nanoparticles showed paramagnetism with antiferromagnetic interaction, however, on further increasing x 5 0.15, the nanoparticles showed canted antiferromagnetic coupling.

Structural Investigations of (Ni,Cu) Co–Doped ZnO Nanocrystals by X‐ray Absorption Spectroscopy

“…Besides ZnO, TM doping has been done in other oxide materials viz.,CdO, In 2 O 3 , SnO 2 etc. also in their nanocrystalline form, however, most of them do not show any ferromagnetic behavior …”

Enhanced Structural and Electrochemical Stability of Self-Similar Rice-Shaped SnO2 Nanoparticles

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Structural, Optical, and Magnetic Properties of Nickel‐Doped Tin Dioxide Nanoparticles Synthesized by Solvothermal Method

“…In addition, polymeric citrate precursor route is insensitive to the presence of moisture and it does not require any inert atmosphere as well as even without careful control of the gel processing time, a high degree of homogeneity may be obtained in nanoproducts. Recently, this method has been used for the successful synthesis of Mn‐ and Co‐doped SnO 2 nanoparticles with controlled morphology . In this paper, we present our investigation to understand the structural, optical, and magnetic properties of Ni‐doped SnO 2 nanoparticles synthesized by modified solvothermal method through oxalate precursor route.…”