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Qiu W.,Chongqing University | Qiu W.,Guizhou Nanomaterials Engineering Center | Qiu W.,Guizhou Institute of Metallurgy and Chemical Engineering | Ma L.,Chongqing University | And 5 more authors.
Polymer Engineering and Science | Year: 2013

Polyaniline (PANI) nanofibers were prepared via the reaction of aniline with ammonium persulfate carried out in ethylene glycol (EG) medium without water. These purified PANI nanofibers could be dispersed in water and other polar solvents, such as ethanol, EG, and N,N-dimethylformamide, to form colloids. The morphology and structure of the PANI nanofibers were characterized and the effects of mechanical stirring on the morphology, structure, and electrical performance of PANI were investigated. The results indicated that the intermolecular H-bonding interaction between molecules of PANI and alcohol is advantageous to the one-dimensional growth of PANI, and a stirring reaction results in a lager size, a higher doping level, conductivity, degree of crystallinity, and oxidation than a nonstirring reaction. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers. Copyright © 2012 Society of Plastics Engineers.


Qiu W.,Guizhou Institute of Metallurgy and Chemical Engineering | Qiu W.,Guizhou Nanomaterials Engineering Center | Huang H.,China Electric Power Research Institute | Liu J.-X.,Guizhou Institute of Metallurgy and Chemical Engineering | And 4 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

The polyaniline-gold (PANI-Au) composite film was prepared using HAuCl4 as oxidant and aniline (ANI) as reduction agent by in-situ polymerization. The morphology of composite film was characterized by scanning electron microscopy (SEM), and the formation of composite film was monitored by quartz crystal microbalance (QCM). The kinetics of the film formation was investigated by QCM technique. The results indicate that the gold particles uniformly disperse in the composite film. The composite film growth rate increases with the rise of HAuCl4, ANI and reaction temperature. The reaction exhibits half-order with respect to HAuCl4 and 1.5-order to aniline, and the activation energy calculated from the temperature dependence of the growth rate is (40.32±0.15) kJ/mol.


Qiu W.,Chongqing University | Qiu W.,Guizhou Nanomaterials Engineering Center | Qiu W.,Guizhou Institute of Metallurgy and Chemical Engineering | Ma L.,Chongqing University | And 6 more authors.
Journal of Nanoparticle Research | Year: 2014

The uniform polyaniline (PANI) nanorods were prepared by the chemical method with the assistance of ethylene glycol (EG) medium. The morphology and structure of the PANI nanorods were characterized by SEM, TEM, FTIR, and UV-vis technique, and the effects of stirring on the morphology, structure, electrical conductivity, and electrochemical behavior of PANI were investigated. The results showed that as-synthesized PANI can be facilely dispersed in water and ethanol to form colloids. During the reaction, the H-bonding between molecules of PANI and EG plays a key role for the one-dimensional. In the presence of stirring, uniform PANI nanorods with diameters of 50-80 nm and length up to 400-800 nm can be obtained, and the aspect ratio is about 4. While in the absence of stirring, the aspect ratio of nanorods increases to more than 10, the diameter and length are 20-60 nm and 0.2-1 lm, respectively. In addition, the stirring can result in a higher doping level, conductivity, and degree of oxidation. Based on these results, a possible formation mechanism of PANI nanostructures is presented. © Springer International Publishing Switzerland 2014.


Bai Y.,Chongqing University | Gan M.,Chongqing University | Qiu W.,Chongqing University | Qiu W.,Guizhou Nanomaterials Engineering Center | And 5 more authors.
Polymer Science - Series B | Year: 2014

The polyaniline-gold (PANI-AuNPs) fibrillar nanocomposites were prepared via a simple onepot synthesis route in ethylene glycol (EG) medium. The morphology of PANI-AuNPs was characterized by transmission electron microscopy (TEM), and their electrochemical properties were studied by CV, TAF and EIS measurement using an electrochemical workstation. The results show that the morphology of nanocomposites can be controlled by changing the temperature. The diameter of PANI-AuNPs composite nanofiber reduce from about 80 to 30 nm, and the size of AuNP also reduce from about 20 to 4 nm, with the rise of synthesized temperature. When the synthesized temperature is 10°C, the distribution of AuNPs is the best, and the amount of AuNPs dispersed in PANI is the most, as well as the electrochemical performance of PANI-AuNPs is the most excellent. © Pleiades Publishing, Ltd., 2014.

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