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Journal article
Free-standing bilayered vanadium oxide films synthesized by liquid exfoliation of chemically preintercalated delta-LixV2O5 center dot nH(2)O
Materials advances, v 2(8), pp 2711-2718
21 Apr 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
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, delta-LixV2O5 center dot nH(2)O, was prepared using a simple sol-gel based chemical preintercalation synthesis procedure. delta-LixV2O5 center dot nH(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 to 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 similar to 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 V5+ and V4+ 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.
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Details
- Title
- Free-standing bilayered vanadium oxide films synthesized by liquid exfoliation of chemically preintercalated delta-LixV2O5 center dot nH(2)O
- Creators
- Luke Houseman - Drexel UniversitySantanu Mukherjee - Drexel UniversityRyan Andris - Drexel UniversityMichael J. Zachman - Oak Ridge National LaboratoryEkaterina Pomerantseva - Drexel University
- Publication Details
- Materials advances, v 2(8), pp 2711-2718
- Publisher
- Royal Soc Chemistry
- Number of pages
- 8
- Grant note
- 2016K1A4A3945038; 2015K1A4A3047100 / Leading Foreign Research Institute Recruitment Program - Korean National Research Foundation (NRF) via the NNFC-KAIST-Drexel-SMU FIRST Nano2 Co-op Center DMR-1752623 / National Science Foundation; National Science Foundation (NSF) DE-SC0012673 / U.S. Department of Energy, Office of Science, Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000634610800001
- Scopus ID
- 2-s2.0-85104970157
- Other Identifier
- 991019168403604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary