Conformation, molecular structure, and vibrational assignment of bis(2,2,6,6-tetramethylheptane-3,5-dionato)copper(II)

The steady and stoichiometric delivery of metal-organic precursor mixtures is essential for the production of complex, functional nanomaterials in the gas phase. Chemical vapor synthesis (CVS) is a corresponding process which enables the production of complex oxide nanoparticles such as perovskites. While there exist a vast number of compositions that form perovskite structures, many technically relevant materials consist of transition metals and lanthanides. Their corresponding metal organic precursors often deviate significantly in their thermal behavior, resulting in a challenging delivery of precursors to the reactor. One suitable method for precursor delivery is flash evaporation by an infrared laser, where a mixture of solid precursors is instantly sublimed. Using flash evaporation, the stoichiometry of the generated vapor corresponds to the composition of precursors in the solid mixture. In this study, we present an alternative flash evaporation system based on a marking laser which rapidly scans a focused infrared beam across a precursor powder bed. By focusing the beam, higher energy densities are reached, compared to existing systems while a large area powder bed is repeatedly scanned and sublimed. Fourier-transform infrared spectroscopy (FTIR) measurements confirm the decomposition-free sublimation of precursor mixtures. Furthermore, we confirm the successful precursor delivery by the synthesis of LaFeO3 nanoparticles with an average crystallite size of 5.3 nm. The structure of the ensemble of nanoparticles is examined using X-ray diffraction (XRD) and Rietveld refinement, transmission electron microscopy (TEM), selected area diffraction (SAED), and extended X-ray absorption fine structure (EXAFS) at the Fe-K edge analyzed by reverse Monte Carlo (RMC) analysis.

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Flash evaporation of low volatility solid precursors by a scanning infrared laser

Geiss

Schulte

Winterer

2022

J Nanopart Res

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The effect of alkyl substituents in the β-side on the conformation, molecular structure, and copper-oxygen bond strength of bis(β-diketonato)copper(II) complexes by DFT results and experimental vibrational and UV spectra

Hakimitabar¹,

Vakili²,

Darugar³

et al. 2023

Transit Met Chem

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Authentication of potential energy distribution by VEDA in vibrational assignment some of copper (II) of β-diketone complexes

et al. 2022

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Conformation, molecular structure, and vibrational assignment of bis(2,2,6,6-tetramethylheptane-3,5-dionato)copper(II)

Cited by 13 publications

References 20 publications

Flash evaporation of low volatility solid precursors by a scanning infrared laser

Flash evaporation of low volatility solid precursors by a scanning infrared laser

The effect of alkyl substituents in the β-side on the conformation, molecular structure, and copper-oxygen bond strength of bis(β-diketonato)copper(II) complexes by DFT results and experimental vibrational and UV spectra

Authentication of potential energy distribution by VEDA in vibrational assignment some of copper (II) of β-diketone complexes

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