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Title: Enhancement of Local Piezoresponse in Polymer Ferroelectrics via Nanoscale Control of Microstructure

Polymer ferroelectrics are flexible and lightweight electromechanical materials that are widely studied due to their potential application as sensors, actuators, and energy harvesters. However, one of the biggest challenges is their low piezoelectric coefficient. Here, we report a mechanical annealing effect based on local pressure induced by a nanoscale tip that enhances the local piezoresponse. This process can control the nanoscale material properties over a microscale area at room temperature. We attribute this improvement to the formation and growth of beta-phase extended chain crystals via sliding diffusion and crystal alignment along the scan axis under high mechanical stress. We believe that this technique can be useful for local enhancement of piezoresponse in ferroelectric polymer thin films.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [4] ;  [2] ;  [2] ;  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
  3. Xiangtan Univ., Hunan (China)
  4. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; LDRD FY2014-063-R1; User Facilities under Contract DE-AC02-06CH11357
Type:
Published Article
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; P(VDF-TrFE ); ferroelectric polymers; mechanical annealing effect; piezoresponse hysteresis loops
OSTI Identifier:
1172270
Alternate Identifier(s):
OSTI ID: 1357171