2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity

Apte, Amey; Mozaffari, Kosar; Samghabadi, Farnaz; Hachtel, Jordan; Chang, Long; Susarla, Sandhya; Idrobo Tapia, Juan; Litvinov, Dmitri; Sharma, Pradeep; Puthirath, Anand B.; Ajayan, Pulickel

doi:10.1002/adma.202000006

Title: 2D Electrets of Ultrathin MoO₂ with Apparent Piezoelectricity

Journal Article · Wed May 06 00:00:00 EDT 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202000006· OSTI ID:1649561

Apte, Amey ^[1]; Mozaffari, Kosar ^[2]; Samghabadi, Farnaz ^[2];

^[3]; Chang, Long ^[2]; Susarla, Sandhya ^[1];

^[3]; Litvinov, Dmitri ^[2]; Sharma, Pradeep ^[2]; Puthirath, Anand B. ^[1]; Ajayan, Pulickel ^[1]

Rice Univ., Houston, TX (United States)
Univ. of Houston, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Abstract Since graphene, a variety of 2D materials have been fabricated in a quest for a tantalizing combination of properties and desired physiochemical behavior. 2D materials that are piezoelectric, i.e., that allow for a facile conversion of electrical energy into mechanical and vice versa, offer applications for sensors, actuators, energy harvesting, stretchable and flexible electronics, and energy storage, among others. Unfortunately, materials must satisfy stringent symmetry requirements to be classified as piezoelectric. Here, 2D ultrathin single‐crystal molybdenum oxide (MoO ₂ ) flakes that exhibit unexpected piezoelectric‐like response are fabricated, as MoO ₂ is centrosymmetric and should not exhibit intrinsic piezoelectricity. However, it is demonstrated that the apparent piezoelectricity in 2D MoO ₂ emerges from an electret‐like behavior induced by the trapping and stabilization of charges around defects in the material. Arguably, the material represents the first 2D electret material and suggests a route to artificially engineer piezoelectricity in 2D crystals. Specifically, it is found that the maximum out‐of‐plane piezoresponse is 0.56 pm V ⁻¹ , which is as strong as that observed in conventional 2D piezoelectric materials. The charges are found to be highly stable at room temperature with a trapping energy barrier of ≈2 eV.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649561

Alternate ID(s):: OSTI ID: 1617393

Journal Information:: Advanced Materials, Vol. 32, Issue 24; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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