Effect of thickness on the crystallinity and Curie transition behavior in P(VDF/TrFE) (72/28) copolymer thin films using FTIR-transmission spectroscopy

A. Anand Prabu, Kap Jin Kim, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The effect of thickness on the ferroelectric behavior in spin-cast poly(vinylidene fluoride/trifluoroethylene) (P(VDF/TrFE)) (72/28 mol%) random copolymer films with varying degree of crystallinity was analyzed qualitatively and quantitatively using Fourier transform infrared-transmission spectroscopy (FTIR-TS) data. From the qualitative analysis of raw IR data, the critical thickness of crystallization was observed near 130 nm, below which the films exhibited significant changes in crystalline peak (1292 cm-1) absorption. Using factor analysis (FA) of their raw IR data, we have isolated the pure crystalline and amorphous phase spectra, and also quantitatively calculated their degree of crystallinity as a function of thickness. FA of the mixture spectra obtained at varying temperatures during a heating-cooling cycle (30 °C → 140 °C → 30 °C) was conducted to isolate the pure spectra of the low-temperature (ferroelectric) and high-temperature (paraelectric) crystalline phases and to determine the content of each phase quantitatively as functions of thickness and temperature. Curie transition temperature during heating (Tc) and cooling (Tc) decreased and increased, respectively, resulting in reduced temperature range between Tc ↔ Tc with decreasing film thickness used in our study and the quantitative data obtained from FA were quite comparable with the qualitative data obtained from raw IR analysis.

Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalVibrational Spectroscopy
Volume49
Issue number2
DOIs
Publication statusPublished - 2009 Mar 18

Bibliographical note

Funding Information:
This study was supported by “The National Research Program for the 0.1 Terabit Non-volatile Memory Development sponsored by Korea Ministry of Commerce, Industry and Energy” and Korea Science and Engineering Foundation (KOSEF) through the SRC/ERC Program of MOST/KOSEF (R11-2005-065). The authors (AAP and KJK) also wish to thank the Korea Research Foundation (KRF) for their partial financial support based on International Academic Exchange Program (KRF-2006-D00021).

All Science Journal Classification (ASJC) codes

  • Spectroscopy

Fingerprint

Dive into the research topics of 'Effect of thickness on the crystallinity and Curie transition behavior in P(VDF/TrFE) (72/28) copolymer thin films using FTIR-transmission spectroscopy'. Together they form a unique fingerprint.

Cite this