Abstract
Although polymerized aniline (polyaniline, PANI) with and without iodine (I2) doping has already been extensively studied, little work has been done on the synthesis of PANI films using atmospheric pressure plasma (APP) deposition. Therefore, this study characterized pure and I2-doped PANI films synthesized using an advanced APP polymerization system. The I2 doping was conducted ex-situ and using an I2 chamber method following the APP deposition. The pure and I2-doped PANI films were structurally analyzed using field emission scanning electron microscope (FE-SEM), atomic force microscope (AFM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and time of flight secondary ion mass spectrometry (ToF-SIMS) studies. When increasing the I2 doping time, the plane and cross-sectional SEM images showed a decrease in the width and thickness of the PANI nanofibers, while the AFM results showed an increase in the roughness and grain size of the PANI films. Moreover, the FT-IR, XPS, and ToF-SIMS results showed an increase in the content of oxygen-containing functional groups and C=C double bonds, yet decrease in the C–N and C–H bonds when increasing the I2 doping time due to the reduction of hydrogen in the PANI films via the I2. To check the suitability of the conductive layer for polymer display applications, the resistance variations of the PANI films grown on the interdigitated electrode substrates were also examined according to the I2 doping time.
Highlights
Low-pressure plasma polymerization is a well-established and extensively studied area [1,2,3]
Pure and I2 -doped polymerized aniline (PANI) films were prepared using an advanced atmospheric pressure plasma (APP) polymerization system to study the formation of thin films for potential application
field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM) studies revealed that the thickness of the PANI films decreased while the roughness increased when increasing the I2 that the thickness of the PANI films decreased while the roughness increased when increasing the I2 doping time; this increased roughness was mainly due to a high porosity from disconnected networks doping time; this increased roughness was mainly due to a high porosity from disconnected networks between adjacent nanofibers
Summary
Low-pressure plasma polymerization is a well-established and extensively studied area [1,2,3] Use of such system, is costly and requires routine maintenance, thereby limiting its application to batch processes. An attractive alternative is the use of atmospheric pressure plasma (APP) polymerization for the synthesis of novel thin film materials [4,5,6,7,8,9,10,11,12,13,14,15,16]. With various advantages, including a low-temperature dry process and low-cost routine maintenance, APP polymerization is a promising growth system for the deposition of novel plasma polymer thin films with functional features that are well-suited for a wide range of applications and substrates. The application of APP polymerization for fabricating PANI thin films, is not well developed
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