2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity
Abstract
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.
- Authors:
-
- Rice Univ., Houston, TX (United States)
- Univ. of Houston, TX (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1649561
- Alternate Identifier(s):
- OSTI ID: 1617393
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Volume: 32; Journal Issue: 24; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Apte, Amey, Mozaffari, Kosar, Samghabadi, Farnaz, Hachtel, Jordan, Chang, Long, Susarla, Sandhya, Idrobo Tapia, Juan, Litvinov, Dmitri, Sharma, Pradeep, Puthirath, Anand B., and Ajayan, Pulickel. 2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity. United States: N. p., 2020.
Web. doi:10.1002/adma.202000006.
Apte, Amey, Mozaffari, Kosar, Samghabadi, Farnaz, Hachtel, Jordan, Chang, Long, Susarla, Sandhya, Idrobo Tapia, Juan, Litvinov, Dmitri, Sharma, Pradeep, Puthirath, Anand B., & Ajayan, Pulickel. 2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity. United States. https://doi.org/10.1002/adma.202000006
Apte, Amey, Mozaffari, Kosar, Samghabadi, Farnaz, Hachtel, Jordan, Chang, Long, Susarla, Sandhya, Idrobo Tapia, Juan, Litvinov, Dmitri, Sharma, Pradeep, Puthirath, Anand B., and Ajayan, Pulickel. Wed .
"2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity". United States. https://doi.org/10.1002/adma.202000006. https://www.osti.gov/servlets/purl/1649561.
@article{osti_1649561,
title = {2D Electrets of Ultrathin MoO2 with Apparent Piezoelectricity},
author = {Apte, Amey and Mozaffari, Kosar and Samghabadi, Farnaz and Hachtel, Jordan and Chang, Long and Susarla, Sandhya and Idrobo Tapia, Juan and Litvinov, Dmitri and Sharma, Pradeep and Puthirath, Anand B. and Ajayan, Pulickel},
abstractNote = {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.},
doi = {10.1002/adma.202000006},
journal = {Advanced Materials},
number = 24,
volume = 32,
place = {United States},
year = {Wed May 06 00:00:00 EDT 2020},
month = {Wed May 06 00:00:00 EDT 2020}
}
Web of Science
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