By Topic

Optical Properties of a Fluorinated Polyimide as Related to Ethanol and Water-Vapor-Sensing Capability

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)

Thin films of a fluorinated polyimide derived from 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and 2,3,5,6-tetramethyl-1,4-phenylenediamine have been obtained by spin-coating a solution of polyimide powder dissolved in chloroform. The synthesized polyimide has been characterized by a variety of techniques including Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis, differential scanning calorimetry, solubility tests, optical transmission spectroscopy, and fluorescence spectroscopy. Changes in the intensity, peak shape, and position of the intrinsic fluorescence features as observed under exposure to ethanol and water vapors have been correlated to specific chemical interactions between the analytes and the macromolecules. Interactions stronger than dipole-dipole forces such as hydrogen bonds, evidenced by FTIR, are thought to play an important role in the changes of the fluorescence features. Single-wavelength fluorescence versus time measurements have also been performed by exposing the samples to alternating pulses of N 2 and different organic-vapor concentrations in order to evaluate the response and recovery times and the quantitative determination capability of the material. The polymer proved to be sensitive to both the tested analytes, with response and recovery times in the order of the tens of seconds

Published in:

Sensors Journal, IEEE  (Volume:6 ,  Issue: 6 )