Mechanical Characterization of Stacked Single-Crystal of Polyethylene and Monolayer MoSe2

Dong Zhou; Gang Feng; Henna Khosla; Scott T. Retterer; Bo Li

doi:10.1002/adfm.202201612

Mechanical Characterization of Stacked Single-Crystal of Polyethylene and Monolayer MoSe₂

Dong Zhou, Gang Feng, Henna Khosla, Scott T. Retterer, Bo Li

Center for Nanophase Matls Sciences

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Polymer single crystal (SC) is a key building block of semicrystalline polymers. However, direct experimental measurement of freestanding mono-lamella polymer SC has not been demonstrated. This is, in large part, due to the difficulties associated with manipulating freestanding individual mono-lamella SC because of its extremely low rigidity and low robustness. Here, we demonstrate a new strategy to successfully suspend and test a polymer SC by using a 2D material as backing. In particular, mono-lamella polyethylene (PE) SC is stacked on monolayer MoSe₂, and the hybrid stacks can be suspended over microholes. Nanoindentation is used to probe the suspended PE-SC/MoSe₂ stacks and MoSe₂ monolayers. The results suggest the first experimentally-measured in-plane moduli of PE-SC and 2D MoSe₂ as 32 ± 3 and 237 ± 15 GPa, respectively. Such a stacked unit represents an ultrathin structure of polymer-ceramic laminate and the idea can be applied to other laminated composite systems. Therefore, this research will pave the way to accurately measure the mechanical properties of polymer SCs and their composites, as well as provide a key insight on designing composite structures.

Original language	English
Article number	2201612
Journal	Advanced Functional Materials
Volume	32
Issue number	33
DOIs	https://doi.org/10.1002/adfm.202201612
State	Published - Aug 15 2022

Funding

D.Z. and G.F. contributed equally to this work. Particularly, D.Z. synthesized the samples and G.F. conducted nanoindentation tests and mechanical analysis. B.L. and G.F. initiated and sponsored the research. H.K. performed finite element analysis modeling, and S.R. fabricated the substrate with microholes. D.Z and B.L. acknowledge the financial support from the Startup fund of Villanova University. D.Z. and B.L. were partially supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Visiting Faculty Program (VFP). Fabrication of the microhole arrays used in this study was conducted at the Center for Nanophase Materials Sciences, which was a DOE Office of Science User Facility. H.K. acknowledges the financial support from the scholarship from Villanova University as well as the “Bernard Henry AIMCAL‐SVC Scholarship” from the Society of Vacuum Coaters (SVC) Foundation.

Funders	Funder number
Society of Vacuum Coaters
U.S. Department of Energy
Office of Science
Workforce Development for Teachers and Scientists
Villanova University

Keywords

MoSe
mechanical properties
nanoindentation
polyethylene
single crystal

Access to Document

10.1002/adfm.202201612

Cite this

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title = "Mechanical Characterization of Stacked Single-Crystal of Polyethylene and Monolayer MoSe2",

abstract = "Polymer single crystal (SC) is a key building block of semicrystalline polymers. However, direct experimental measurement of freestanding mono-lamella polymer SC has not been demonstrated. This is, in large part, due to the difficulties associated with manipulating freestanding individual mono-lamella SC because of its extremely low rigidity and low robustness. Here, we demonstrate a new strategy to successfully suspend and test a polymer SC by using a 2D material as backing. In particular, mono-lamella polyethylene (PE) SC is stacked on monolayer MoSe2, and the hybrid stacks can be suspended over microholes. Nanoindentation is used to probe the suspended PE-SC/MoSe2 stacks and MoSe2 monolayers. The results suggest the first experimentally-measured in-plane moduli of PE-SC and 2D MoSe2 as 32 ± 3 and 237 ± 15 GPa, respectively. Such a stacked unit represents an ultrathin structure of polymer-ceramic laminate and the idea can be applied to other laminated composite systems. Therefore, this research will pave the way to accurately measure the mechanical properties of polymer SCs and their composites, as well as provide a key insight on designing composite structures.",

keywords = "MoSe, mechanical properties, nanoindentation, polyethylene, single crystal",

author = "Dong Zhou and Gang Feng and Henna Khosla and Retterer, {Scott T.} and Bo Li",

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AU - Zhou, Dong

AU - Feng, Gang

AU - Khosla, Henna

AU - Retterer, Scott T.

AU - Li, Bo

PY - 2022/8/15

Y1 - 2022/8/15

N2 - Polymer single crystal (SC) is a key building block of semicrystalline polymers. However, direct experimental measurement of freestanding mono-lamella polymer SC has not been demonstrated. This is, in large part, due to the difficulties associated with manipulating freestanding individual mono-lamella SC because of its extremely low rigidity and low robustness. Here, we demonstrate a new strategy to successfully suspend and test a polymer SC by using a 2D material as backing. In particular, mono-lamella polyethylene (PE) SC is stacked on monolayer MoSe2, and the hybrid stacks can be suspended over microholes. Nanoindentation is used to probe the suspended PE-SC/MoSe2 stacks and MoSe2 monolayers. The results suggest the first experimentally-measured in-plane moduli of PE-SC and 2D MoSe2 as 32 ± 3 and 237 ± 15 GPa, respectively. Such a stacked unit represents an ultrathin structure of polymer-ceramic laminate and the idea can be applied to other laminated composite systems. Therefore, this research will pave the way to accurately measure the mechanical properties of polymer SCs and their composites, as well as provide a key insight on designing composite structures.

AB - Polymer single crystal (SC) is a key building block of semicrystalline polymers. However, direct experimental measurement of freestanding mono-lamella polymer SC has not been demonstrated. This is, in large part, due to the difficulties associated with manipulating freestanding individual mono-lamella SC because of its extremely low rigidity and low robustness. Here, we demonstrate a new strategy to successfully suspend and test a polymer SC by using a 2D material as backing. In particular, mono-lamella polyethylene (PE) SC is stacked on monolayer MoSe2, and the hybrid stacks can be suspended over microholes. Nanoindentation is used to probe the suspended PE-SC/MoSe2 stacks and MoSe2 monolayers. The results suggest the first experimentally-measured in-plane moduli of PE-SC and 2D MoSe2 as 32 ± 3 and 237 ± 15 GPa, respectively. Such a stacked unit represents an ultrathin structure of polymer-ceramic laminate and the idea can be applied to other laminated composite systems. Therefore, this research will pave the way to accurately measure the mechanical properties of polymer SCs and their composites, as well as provide a key insight on designing composite structures.

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