Loss of hyperfine structure in the liquid helium EPR spectra of some cobalt oxygen adducts

Lever, A. B. P.; Gray, H.B.

doi:10.1016/0022-2364(78)90089-6

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…This high g value agrees well with related literature reports (see Supporting Information). − Based on the g value of 4.3, we can estimate the value of E/D to be ∼0.02 (unitless). ,− A signal at ∼3400 G is due to Cu 2+ defects, with g z = g ∥ = 2.26 and g x , g y = g ⊥ = 2.025, A x , A y = A ⊥ = 16 × 10 –4 cm –1 , and A z = A ∥ = 133 × 10 –4 cm –1 (see Supporting Information). These values are similar to those in previous reports for Cu 2+ spectra. − We believe that the resolution differences are due to changes in concentration of the Cu 2+ impurity in each sample.…”

Section: Resultsmentioning

confidence: 99%

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺

Thompson

Blakeney²,

Cady³

et al. 2016

Chem. Mater.

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Because of its useful optoelectronic properties and the relative abundance of its elements, the quaternary semiconductor Cu 2 ZnSnS 4 (CZTS) has garnered considerable interest in recent years. In this work, we dope divalent, high spin transition metal ions (M 2+ = Mn 2+ , Co 2+ , Ni 2+ ) into the tetrahedral Zn 2+ sites of wurtzite CZTS nanorods. The resulting Cu 2 M x Zn 1−x SnS 4 (CMTS) nanocrystals retain the hexagonal crystalline structure, elongated morphology, and broad visible light absorption profile of the undoped CZTS nanorods. Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and infrared (IR) spectroscopy help corroborate the composition and local ion environment of the doped nanocrystals. EPR shows that, similarly to Mn x Cd 1−x Se, washing Cu 2 Mn x Zn 1−x SnS 4 nanocrystals with trioctylphosphine oxide (TOPO) is an efficient way to remove excess Mn 2+ ions from the particle surface. XPS and IR of as-isolated and thiol-washed samples show that, in contrast to binary chalcogenides, Cu 2 Mn x Zn 1−x SnS 4 nanocrystals aggregate not through dichalcogenide bonds, but through excess metal ions cross-linking the sulfur-rich surfaces of neighboring particles. Our results may help in expanding the synthetic applicability of CZTS and CMTS materials beyond photovoltaics and into the fields of spintronics and magnetic data storage.

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Section: Resultsmentioning

confidence: 99%

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺

Thompson

Blakeney²,

Cady³

et al. 2016

Chem. Mater.

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show abstract

“…This high g value agrees well with related literature reports (see Supporting Information). [92][93][94][95] Based on the g value of 4.3, we can estimate the value of E/D to be ~0.02 (unitless). 89,[96][97][98] The signal at ~3400 G is due to Cu 2+ defects, with gz = g∥ = 2.26 and gx, gy = g⊥ = 2.025, Ax, Ay = A⊥ =16×10 -4 cm -1 and Az = A∥ = 133×10 -4 cm -1 (see Supporting Information).…”

Section: Epr Characterization and Effect Of Topo Washingmentioning

confidence: 99%

Synthesis and modification of ternary and quaternary chalcogenide nanocrystals

Thompson

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Cu2ZnSnS4 (CZTS) is a promising material for solar energy conversion, but synthesis of phase pure, anisotropic CZTS nanocrystals remains a challenge. We demonstrate that the initial concentration (loading) of cationic precursors has a dramatic effect on the morphology (aspect ratio) and composition (internal architecture) of hexagonal wurtzite CZTS nanorods. Our experiments strongly indicate that Cu(C5H7O2)2 is the most reactive of the metal salt precursors, Zn(CH3CO2)2 is the next most reactive, and Sn(CH3CO2)4 is the least reactive of the three. Using this reactivity series, we are able to purposely fine-tune the morphology (dots vs. rods) and degree of axial phase segregation of CZTS nanocrystals. These results will improve our ability to fabricate CZTS nanostructures for photovoltaics and photocatalysis.

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Loss of hyperfine structure in the liquid helium EPR spectra of some cobalt oxygen adducts

Cited by 2 publications

References 7 publications

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺

Synthesis and modification of ternary and quaternary chalcogenide nanocrystals

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Loss of hyperfine structure in the liquid helium EPR spectra of some cobalt oxygen adducts

Cited by 2 publications

References 7 publications

Cu2ZnSnS4 Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn2+, Co2+, and Ni2+

Cu2ZnSnS4 Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn2+, Co2+, and Ni2+

Synthesis and modification of ternary and quaternary chalcogenide nanocrystals

Contact Info

Product

Resources

About

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺

Cu₂ZnSnS₄ Nanorods Doped with Tetrahedral, High Spin Transition Metal Ions: Mn²⁺, Co²⁺, and Ni²⁺