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Multinuclear Magnetic Resonance Tracking of Hydro, Thermal and Hydrothermal Decomposition of CH3NH3PbI3
Download2017-01-01
Askar, A.,, Bernard, G.M, Wiltshire,, B., Shankar, K., Michaelis, V.K.
An NMR investigation of methylammonium lead iodide, the leading member of the hybrid organic-inorganic perovskite class of materials, and of its putative decomposition products as a result of exposure to heat and humidity, has been undertaken. We show that the 207Pb NMR spectra of the compound of...
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2017-01-01
Bernard, G.M., Goyal, A., Miskolzie, M., McKay, R., Wu, Q., Wasylishen, R.E., Michaelis, V.K.
A new solid-state nuclear magnetic resonance (NMR) thermometry sample is proposed. The 207Pb NMR chemical shift of a lead halide perovskite, methylammonium lead chloride (MAPbCl3) is very sensitive to temperature, 0.905 ± 0.010 ppm K−1. The response to temperature is linear over a wide...
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2017-01-01
Zhou, B., Faucher, A., Laskowski, R., Terskikh, V.V., Kroeker, S., Sun, W., Lin, J., Mi, J-X., Michaelis, V.K., Pan, Y.
A series of well-characterized magnesium borate minerals and synthetic analogues have been studied via ultrahigh-field 25Mg solid-state NMR spectroscopy. Correlations between 25Mg NMR parameters and the local structure at the magnesium site(s) are highlighted and discussed. First-principles...
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Composition-Tunable Formamidinium Lead Mixed Halide Perovskites via Solvent-Free Mechanochemical Synthesis: Decoding the Pb Environments Using Solid-State NMR Spectroscopy
Download2018-01-01
Askar, A.M., Karmakar, A., Bernard, G.M., Ha, M., Terskikh, V.V., Wiltshire, B.D., Patel, S., Fleet, J., Shankar, K., Michaelis, V.K.
Mixed-halide lead perovskites are becoming of paramount interest in the optoelectronic and photovoltaic research fields, offering band gap tunability, improved efficiency, and enhanced stability compared to their single halide counterparts. Formamidinium-based mixed halide perovskites (FA-MHPs)...
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Ultrahigh-Resolution 7Li Magic-Angle Spinning Nuclear Magnetic Resonance Spectroscopy by Isotopic Dilution
Download2018-01-01
Michaelis, V.K., Levin, K., Germanov, Y., Lelong, G., Kroeker, S.
The functional importance of lithium in many types of materials requires reliable methods for studying its local structure and dynamics. Nuclear magnetic resonance (NMR) spectroscopy should be ideal for this purpose but suffers from poor resolution due to intrinsic dipolar broadening. We overcome...
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A 11B and 31P MAS NMR study of the impact of Ca2+ and Sr2+ network modifying cations on the structure of borate and borophosphate glasses
Download2018-01-01
Jin, T., Bernard, G.M., Miskolzie, M., Terskikh, V.V., Michaelis, V.K.
A detailed qualitative and quantitative analysis of the short and medium range order of alkaline earth binary borate and ternary borophosphate glasses has been carried out through the use of 11B and 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. In order to understand...
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2018-01-01
Karmakar, A., Dodd, M.S., Agnihotri, S., Ravera, E., Michaelis, V.K.
Lead-free halide double perovskites with a generic formula of A2B′(III)B″(I)X6 (A and B are cations and X is a halide anion) are being explored as a less toxic, higher thermal- and moisture-stable alternative to well-studied lead halide perovskite (APbX3) solar energy absorbers. However, the...
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Mechanochemical Synthesis of Methylammonium Lead Mixed–Halide Perovskites: Unraveling the Solid-Solution Behavior Using Solid-State NMR
Download2018-01-01
Karmakar, A., Askar, A.M., Bernard, G.M., Terskikh, V.V., Ha, M., Patel, S., Shankar, K., Michaelis, V.K.
Mixed-halide lead perovskite (MHP) materials are rapidly advancing as next-generation high-efficiency perovskite solar cells due to enhanced stability and bandgap tunability. In this work, we demonstrate the ability to readily and stoichiometrically tune the halide composition in...
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Alkaline Earth Metal–Organic Frameworks with Tailorable Ion Release: A Path for Supporting Biomineralization
Download2019-01-01
Matlinska, M.A., Ha, M., Hughton, B., Oliynyk, A.O., Iyer, A.K., Bernard, G.M., Lambkin, G., Lawrence, M.C., Katz, M.J., Mar, A., Michaelis, V.K.
An innovative application of metal–organic frameworks (MOFs) is in biomedical materials. To treat bone demineralization, which is a hallmark of osteoporosis, biocompatible MOFs (bioMOFs) have been proposed in which various components, such as alkaline-earth cations and bisphosphonate molecules,...
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2019-01-01
Ha, M., Thiessen, A.N., Sergeyev, I.V., Veinot, J.G.C., Michaelis, V.K.
Silicon nanoparticles (SiNPs) are intriguing materials and their properties fascinate the broader scientific community; they are also attractive to the biological and materials science sub-disciplines because of their established biological and environmental compatibility, as well as their...