Simple synthesis of polyaniline microtubes for the application on silver microrods preparation
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izhen Guo, Binghua Yang, Minhong He, Ye Tian, JianChao Cheng, and Yaqing Liu Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051, People’s Republic of China (Received 19 December 2010; accepted 8 November 2011)
Polyaniline (PANI) microtubes were successfully synthesized by a simple way without using any templates. Their structure was characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, ultraviolet–visible absorption spectra, and Fourier transform infrared spectroscopy. The average length and diameter of the microtubes were about 12.0 and 3.0 lm, respectively. In addition, silver microrods were further prepared using the PANI microtubes as templates. Scanning electron microscopy, energy-dispersive x-ray spectra, x-ray diffraction, and ultraviolet–visible absorption spectra analyses were performed to characterize the structure of the sample. The results indicated the formation of silver microrods inside PANI microtubes. Moreover, the microwave absorption and electrical properties of PANI microtubes, PANI particles, and silver microrods were compared. It shows that the silver microrods coated with PANI have good microwave absorption and electrical properties, which can apply on electromagnetic interference shielding and microwave absorption materials.
I. INTRODUCTION
In the past few decades, conductive polymers have attracted considerable attention due to the important role they play in electromagnetic interference (EMI) shielding and microwave absorption technologies.1 Among the conducting polymers, polyaniline (PANI) is perhaps the most versatile because of its easy and inexpensive preparation methods and also its desirable properties, such as thermal and chemical stability, low specific mass, controllable conductivity, and high conductivity at microwave frequencies.2 It has been demonstrated that these physical properties are usually closely related to the particle shape, independent of size.3 So, lots of methods to control the morphology of PANI, for example, electrochemical methods,4 anodized alumina template,5 physical methods,6 and soft template,7–10 have been used in the preparation of PANI nanofibers, nanowires, rods, and tubes. PANI microtubes with moderate conductivity and dielectric property should be an excellent microwave absorbing and EMI shielding material, but very little has been reported on their synthesis and properties. On the other hand, silver is an attractive material because it a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2011.408 J. Mater. Res., Vol. 27, No. 2, Jan 28, 2012
exhibits high electrical and optical properties for applications in catalysis, electronics, photonics, and photography.11,12 Especially, as interconnects or active components in fabricating micro/nanodevices, silver microrods may provide an ideal system for experimentally probing physical phenomena such as quantized conductance and localization effects. Howev
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