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1. Free-standing bilayered vanadium oxide films synthesized by liquid exfoliation of chemically preintercalated δ-Li _x V ₂ O ₅ · n H ₂ O

   https://doi.org/10.1039/D1MA00085C  

   Houseman, Luke ; Mukherjee, Santanu ; Andris, Ryan ; Zachman, Michael J. ; Pomerantseva, Ekaterina ( April 2021 , Materials Advances)

   A free-standing film composed of bilayered vanadium oxide nanoflakes is for the first time synthesized using a new low-energy process. The precursor powder, δ-Li x V 2 O 5 · n H 2 O, was prepared using a simple sol–gel based chemical preintercalation synthesis procedure. δ-Li x V 2 O 5 · n H 2 O was dispersed and probe sonicated in N -methyl pyrrolidone to exfoliate the bilayers followed by vacuum filtration resulting in the formation of a free-standing film with obsidian color. X-ray diffraction showed lamellar ordering of a single-phase material with a decreased interlayer distance compared tomore »that of the precursor powder. Scanning electron microscopy images demonstrated stacking of the individual nanoflakes. This morphology was further confirmed with scanning transmission electron microscopy that showed highly malleable nanoflakes consisting of ∼10–100 vanadium oxide bilayers. One of the most important consequences of this morphological rearrangement is that the electronic conductivity of the free-standing film, measured by the four-probe method, increased by an order of magnitude compared to conductivity of the pressed pellet made of precursor powder. X-ray photoelectron spectroscopy measurements showed the coexistence of both V 5+ and V 4+ oxidation states in the exfoliated sample, possibly contributing to the change in electronic conductivity. The developed approach provides the ability to maintain the phase purity and crystallographic order during the exfoliation process, coupled with the formation of a free-standing film of enhanced conductivity. The produced bilayered vanadium oxide nanoflakes can be used as the building blocks for the synthesis of versatile two-dimensional heterostructures to create innovative electrodes for electrochemical energy storage applications.« less
2. Hydrated Sulfate Clusters SO ₄ ^2– (H ₂ O) _n ( n = 1–40): Charge Distribution Through Solvation Shells and Stabilization

   https://doi.org/10.1021/acs.jpcb.9b01744  

   Kulichenko, Maksim ; Fedik, Nikita ; Bozhenko, Konstantin V. ; Boldyrev, Alexander I. ( April 2019 , The Journal of Physical Chemistry B)
3. Microsolvation in V ⁺ (H ₂ O) _n Clusters Studied with Selected-Ion Infrared Spectroscopy

   https://doi.org/10.1021/acs.jpca.9b11275  

   Carnegie, Prosser D. ; Marks, Joshua H. ; Brathwaite, Antonio D. ; Ward, Timothy B. ; Duncan, Michael A. ( January 2020 , The Journal of Physical Chemistry A)
4. Charge-State Control of Mn ²⁺ Spin Relaxation Dynamics in Colloidal n -Type Zn _1–x Mn _x O Nanocrystals

   https://doi.org/10.1021/acs.jpclett.5b00621  

   Schimpf, Alina M. ; Rinehart, Jeffrey D. ; Ochsenbein, Stefan T. ; Gamelin, Daniel R. ( May 2015 , The Journal of Physical Chemistry Letters)
5. Orbital competition of Mn ³⁺ and V ³⁺ ions in Mn _1+x V _2-x O ₄

   https://doi.org/10.1088/1361-648X/abd9a1  

   Jiao, J L ; Zhang, H P ; Huang, Q ; Wang, W ; Sinclair, R ; Wang, G ; Ren, Q ; Lin, G T ; Huq, A ; Zhou, H D ; et al ( January 2021 , Journal of Physics: Condensed Matter)