Ratiometric Piezochromism of Electrospun Polymer Films: Intermolecular Interactions for Enhanced Sensitivity and Color Difference. Issue 3 (23rd March 2018)

• Record Type: Journal Article
• Authors: Yang, Heyi; Sun, Zhanghua; Lv, Chunyan; Qile, Moge; Wang, Kai; Gao, Huiwen; Zou, Bo; Song, Qingbao; Zhang, Yujian
• Is Part Of: ChemPlusChem. Volume 83:Issue 3(2018)
• Page Start: 132
• Page End: 139
• Publication Date: 2018-03-23
• Subjects: dyes/pigments -- electrospinning process -- high-pressure chemistry -- sensors -- thin films; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201800080
• Languages: English
• ISSNs: 2192-6506

Abstract

Abstract: Many piezochromic luminescent (PCL) dyes are known for their fluorescent switching capacity in the powdered phase, but they are usually difficult to utilize practically owing to poor mechanical properties. Herein, a nanofiber film fabricated through an electrospinning process is doped with PCL dye. The electrospun film not only reveals the mechanics of macromolecular materials, but also achieves precise, gradient pressure recognition (ratiometric PCL behavior). The PCL sensitivity and color difference of the dye in a crystalline state are calculated to be 15.7 nm GPa −1 and 149 nm, respectively. The sensitivity of an electrospun film containing 0.1 % (w/w) dye decreased to 3.6 nm GPa −1 . Moreover, the individual effects of molecular conformation and intermolecular interaction on the PCL properties have been clearly distinguished through in situ high‐pressure experiments. Intermolecular interactions play a more significant role in PCL color difference and sensitivity. The film fabricated through an electrospinning process contributes to understanding of the working mechanism and real applications of piezochromic materials. Abstract : True colors under pressure : A flexible dye‐doped film, fabricated through an electrospinning process, reveals ratiometric piezochromism under hydrostatic pressure (see figure). Moreover, intermolecular π–π interactions contribute to enhanced piezochromic sensitivity and color difference in high‐pressure experiments.