Journal article
Deposition Behavior of Polyaniline on Carbon Nanofibers by Oxidative Chemical Vapor Deposition
Langmuir, v 36(43), pp 13079-13086
03 Nov 2020
PMID: 33095586
Abstract
Oxidative chemical vapor deposition (oCVD) offers unique advantages as a liquid-free processing technique in synthesizing and integrating conducting polymers, including polyaniline (PANI), by enabling conformal coatings onto nanostructured substrates, like carbon nanofibers. With relatively thick nanofiber mats, the challenge is to ensure uniform coating thickness through the porous substrates. Here, the substrate temperature during oCVD is found to be a primary factor influencing PANI coating uniformity. Coating uniformity is enhanced by operating at a higher substrate temperature, where monomer adsorption is believed to be limiting relative to intrinsic reaction kinetics. Also, a higher substrate temperature leads to significantly less PANT oligomers and more PANT in the emeraldine oxidation state. A systematic study of oCVD kinetics with substrate temperature shows a reaction-limited regime at lower substrate temperatures with an activation energy of 12.0 kJ/mol, which is believed to be controlled by the self-catalyzed PANI polymerization reaction that transitions at higher substrate temperatures above 90 degrees C to an adsorption-limited regime as indicated by a negative activation energy of -18.8 kJ/mol. Overall, by operating within an adsorption-limited oCVD regime, more uniform oCVD PANI coatings on electrospun carbon nanofiber mats have been achieved.
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Details
- Title
- Deposition Behavior of Polyaniline on Carbon Nanofibers by Oxidative Chemical Vapor Deposition
- Creators
- Xiaobo Li - Drexel UniversityAyda Rafie - Drexel UniversityVibha Kalra - Drexel UniversityKenneth K. S. Lau - Drexel University
- Publication Details
- Langmuir, v 36(43), pp 13079-13086
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 8
- Grant note
- CMMI1463170 / U.S. National Science Foundation; National Science Foundation (NSF) CMMI1950964 / NSF; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000589253600031
- Scopus ID
- 2-s2.0-85095461088
- Other Identifier
- 991019167524504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary