Journal article
Size-Dependent Physical and Electrochemical Properties of Two-Dimensional MXene Flakes
ACS applied materials & interfaces, Vol.10(29), pp.24491-24498
25 Jul 2018
PMID: 29956920
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Two-dimensional (2D) particles, including transition metal carbides (MXenes), often exhibit large lateral-size polydispersity in delaminated colloidal solutions. This heterogeneity results in challenges when conducting fundamental studies, such as investigating correlations between properties and the 2D flake size. To resolve this challenge, we have developed solution-processable techniques to control and sort 2D titanium carbide (Ti3C2T x ) MXene flakes after synthesis based on sonication and density gradient centrifugation, respectively. By tuning the sonication conditions, Ti3C2T x flakes with varied lateral sizes, ranging from 0.1 to ∼5 μm, can be obtained. Furthermore, density gradient centrifugation was used to sort Ti3C2T x flakes with different lateral sizes into more monodisperse fractions. These processing techniques allow for the characterization of size-dependent optical and electronic properties by measuring the absorption spectra and film conductivity, respectively. Additionally, by testing the material as electrochemical capacitor electrodes, we show the Ti3C2T x flake-size dependence of electrochemical performance. Ti3C2T x films made of flakes with lateral sizes of ∼1 μm showed the best capacitance of 290 F/g at 2 mV/s and rate performance with 200 F/g at 1000 mV/s. The work provides a general methodology which can be followed to control the size of MXenes and other 2D materials for a variety of applications and fundamental size-dependent studies.
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Details
- Title
- Size-Dependent Physical and Electrochemical Properties of Two-Dimensional MXene Flakes
- Creators
- Kathleen Maleski - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials InstituteChang E Ren - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials InstituteMeng-Qiang Zhao - University of PennsylvaniaBabak Anasori - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials InstituteYury Gogotsi - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials Institute
- Publication Details
- ACS applied materials & interfaces, Vol.10(29), pp.24491-24498
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991014969759004721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology