Dissertations / Theses on the topic 'Polyaniline'
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Smith, Jon Anthony. "Polyaniline Gold Nanocomposites." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4900.
Full textWang, Weining. "Electronic transport in polyaniline films and polyaniline/silicon heterostructure solar cellsWeining." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full textAbbas, Zaid Kahtan. "Intrinsically conducting polyaniline blends." Thesis, Kingston University, 2009. http://eprints.kingston.ac.uk/20400/.
Full textGill, Michael. "Polyaniline-silica colloidal nanocomposites." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239632.
Full textFocke, Walter Wilhelm. "Conduction mechanisms in polyaniline." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14642.
Full textJonke, Alex P. "Atomic metal/polyaniline composites." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49070.
Full textMilton, A. J. "Structural properties of polyaniline films." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5548/.
Full textDeng, Chengming. "Synthesis and Characterization of Polyaniline." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1603712965215724.
Full textGinder, John Matthew. "Electronic defect states in polyaniline." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343059710.
Full textSebantu, Lambert. "Electrochemistry of polyaniline-DNA system." [Johnson City, Tenn. : East Tennessee State University], 2004. https://dc.etsu.edu/etd/895.
Full textTitle from electronic submission form. ETSU ETD database URN: etd-0331104-130134. Includes bibliographical references. Also available via Internet at the UMI web site.
SHAH, KUNAL G. "SYNTHESIS AND CHARACTERIZATION OF POLYANILINE,SUBSTITUTED POLYNAILINES AND THEIR COMPOSITES COATINGS ON AL-2024." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004469624.
Full textPADILLA, RONALD MARCOS ARCOS. "STUDY OF TRANSPORT OF POLYMER POLYANILINE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18472@1.
Full textO desenvolvimento de materiais com propriedades elétricas incomuns, como é o caso dos polímeros condutores, vem sendo estudado por muito tempo. Este tipo de sistema orgânico apresenta característica isolante pura, mas quando são introduzidas impurezas por meio da dopagem variam a sua condutividade de forma significativa em comparação com os metais. No presente trabalho, investigamos o transporte de carga eletrônica no sistema molecular do polímero Polianilina (PAN), através de cálculos quânticos mediante o método de Hückel e acoplado com a metodologia das funções de Green de não equilíbrio (FGNE) foram obtidas expressões para a condutância e densidade local de estados (LDOS). Realiza-se o estudo da estrutura eletrônica da PAN conformada de 200 anéis apresentando algum tipo de defeito estrutural tipo polaron o bipolaron onde os efeitos provocados pela desordem desempenham um papel fundamental. Investigamos assim a LDOS e a condutância para formações de cadeias de PAN tanto protonadas e não protonadas, verificando assim que a rede bipolarônica presente na estrutura do sistema apresenta um deslocamento da energia de Fermi para dentro da banda de valência, região de estados espacialmente estendidos onde a condutância é finita, comprovando assim a transição metal-isolante para este material.
The development of materials with unusual electrical properties as is the case of conducting polymers has been studied for a long time. This type of organic system provides insulation characteristic pure, but when impurities are introduced by doping the conductivity varies significantly in comparison with metals. In this study, we investigated the transport of electronic charge in the system polymer molecular Polyaniline (PAN) through quantum calculations by the Hückel method and coupled with the methodology of Green functions of nonequilibrium (FGNE) were obtained expressions for the conductance and local density of states (LDOS). Is carried out to study the electronic structure of PAN conformed to 200 rings showing some type of structural defect type polaron bipolaron where the effects of the disorder play a key role. Thus investigated the LDOS and conductance to PAN formation of chains of both protonated and non protonated, thus verifying that the structure of the bipolaron in this system has a displacement of the Fermi energy into the valence band region of spatially extended states where conductance is finite, thus proving the metal-insulator transition for this material.
Kim, Kwangjoon. "Dynamics of photoexcited states in polyaniline." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343060920.
Full textLong, Stephen M. "Structure of defect states in polyaniline." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343061764.
Full textMenardo, Christine. "La polyaniline : propriétés magnétiques et conductivité." Grenoble 1, 1989. http://www.theses.fr/1989GRE10099.
Full textBaker, M. Christina Opimo. "Applications of polyaniline nanofibers and nanocomposites." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1666392621&sid=19&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textAl, Zohbi Fatima. "Etude de Polyanilines et de nanocomposites Polyaniline/Graphène en milieu liquide ionique protique pour la réalisation de supercondensateurs." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4026/document.
Full textThe work carried out during this PhD thesis is based on the preparation of conducting polymers such as polyaniline (Pani) and their composites associated with graphene for use as electrode materials for supercapacitors application. This work was first dedicated to the synthesis of new protic ionic liquids (PILs) combining pyrrolidinium (Pyrr+) or imidazolium (Imi+) cations with p-toluene sulfonate (PTS-), hydrogen sulfate (HSO4-) or (+)-camphor-10-sulfonate (Cs-) anion, and the study of their physico-chemicals properties (conductivity, viscosity) in binary mixtures PILs/water. After determining the formulations needed to achieve the optimum of transport properties, the specific capacitance of Pani/HCl in these PILs medium was determined, and we have shown that the performance of symmetrical devices are improved in capacitance, specific energy and specific power (400F/g, 7Wh/kg and 4kW/kg for the higher values) in comparison to those obtained in a H2SO4 1M medium. These PILs mediums were also used as a synthesis medium of Pani. We have shown that the nature of PILs, acting as soft template, could change the electronic, morphological and thermal properties of Pani. An optimum of electronic conductivity of Pani (22 S/cm) was obtained with a synthesis realized in the binary mixture [Imi][HSO4]/water 70/30 generating a fibrillar morphology and a good cyclability (93% capacitance retention over 1000 cycles in H2SO4 1M at 2 A/g). For Pani synthesis in [Pyrr][PTS]/water, a thermal stability gain (360 °C) is obtained thanks to a PTS- doped Pani. Finally, a preliminary study on the preparation of composite Pani/graphene and Pani/graphene oxide was performed. The syntheses of nanocomposites were realized in PILs/water mixtures. The optimization of the composition of the Pani nanocomposites was studied and it was found that a mass ratio of about 15% in weight of graphene or graphene oxide enables to obtain promising nanomaterials with higher electrochemical performances compared with pristine Pani
Chiou, Nan-Rong. "Aligned and oriented polyaniline nanofibers: frabrication and applications." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1148485692.
Full textLennartz, Werner. "Strukturuntersuchungen an intrinsisch leitfähigen Polyanilin-, PMMA-Blends SAXS als Messverfahren zur Bestimmung der Morphologie synthetischer Metalle /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970154267.
Full textTian, Shengjun. "Thin functional conducting polymer films preparation, properties and applications /." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975929003.
Full textJameel, Dler Adil. "Electrical properties of sulfonated polyaniline (Span) and polyaniline (Pani) polymers grown on conventional and high index GaAs substrates." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/36040/.
Full textYilmaz, Faris Sad. "Polyaniline: Synthesis, Characterization, Solution Properties, And Composites." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608598/index.pdf.
Full texts modulus of polyaniline-filled low density polyethylene composites became poorer as polyaniline content increased. Moreover, a sudden increase in the electrical conductivity with increasing polyaniline contents was also observed. The conductivity of the tubular composites of multi wall nanotubes (MWNTs)-filled polyaniline increased with increasing MWNTs loading, and became weakly temperature dependent. The morphological analysis indicated that the MWNTs were well dispersed and isolated, and the tubes became crowded proportionally to MWNTs weight percent used in the composites.
West, Ryan Matthew. "Work function fluctuation analysis of polyaniline films." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47586.
Full textOu, Runqing. "Nondestructive characterization of polyaniline emeraldine base films." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/9143.
Full textMonkman, Andrew Paul. "The characterisation of the conducting polymer polyaniline." Thesis, Queen Mary, University of London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363035.
Full textTzamalis, Georgios. "Optical and transport properties of polyaniline films." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4148/.
Full textShaw, Tiana C. "Preparation of Derivatized Polyaniline for Biosensing Applications." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2016. http://digitalcommons.auctr.edu/cauetds/54.
Full textAbia, Atogho Jude. "Polyaniline and Its Derivatives for Environmental Analysis." Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etd/2240.
Full textBrault, Damien. "Synthèse et caractérisations thermoélectriques de polyaniline dopée." Thesis, Tours, 2018. http://www.theses.fr/2018TOUR4032/document.
Full textIn the actual frame of energy efficiency research, namely, the energy management including wasted energy, this PhD project deals with the synthesis and characterization of thermoelectric properties of doped polyaniline. Consequently, polyanilines have been synthesized and the effect of the synthesis conditions, the doping level, the type of dopant, the crystallinity or the sample preparation of the final material on the thermoelectric properties have been studied. Firstly, we measured the thermal dependencies of electrical and thermal conductivities as well as Seebeck coefficient hydrochloric acid doped polyaniline (Pani/HCl). We showed that a low polymerization temperature (223K) lead to better electric conductivity and so improved thermoelectric properties. On the other side, the pressure used to compress powders should as high as 1.109GPa to optimize the thermoelectric performance. Then, in order to have a better understanding of the transport properties of chloride doped polyaniline, we investigate the magnetic and thermal properties. Measurements of the specific heat and the magnetic susceptibility of chloride doped polyaniline as a function of the temperature allowed to determine the electronic states and the mechanism of transport in the polymer chains. Finally, we synthesized and studied camphorsulfonate doped polyaniline by varying the doping level between 30% and 90%. The electrical, thermal conductivities and Seebeck coefficient as a function of the temperature show clearly on optimum of doping level at 50% with camphorsulfonate doping agent
Muthukumaraswamy, Sivaneswary. "Evaluation of electrochromic materials for displays." Thesis, London South Bank University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367908.
Full textGottwald, Tomáš. "Vodivé polymery a jejich využití v superkondenzátorech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218316.
Full textMichaelson, Jeff C. "Polyaniline and related compounds : synthesis, morphology and electrochemistry /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1211.
Full textChiou, Nan-Rong. "Aligned and oriented polyaniline nanofibers fabrication and applications /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1148485692.
Full textSummerour, Jamie Maddox. "Tritium doped polyaniline as a β-irradiation source." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/26962.
Full textGupta, Yogesh. "A study of polyaniline membranes for gas separations." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/8003.
Full textPan, Bo-Hong, and 潘柏宏. "Synthesis of polyaniline gold and polyaniline silver bilayer nanotubes." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/60805822812617525318.
Full text國立中央大學
化學工程與材料工程研究所
93
Abstract Polyaniline gold/silver bilayer nanotubes are synthesized by reduction of aqueous HAuCl4 and AgNO3 with polyaniline. Polyaniline nanotubes of uniform size are synthesized inside the channels of anodic alumina membrane. After dissolving anodic alumina with NaOH and polyaniline with NMP, the remaining gold and silver tubes can be obtained. We also synthesized polyaniline palladium bilayer nanotubes by electroless plating of Pd in SnCl2-PdCl2 solution. SEM photographs show the formation of polyaniline gold/silver/palladium bilayer nanotubes. EDX results confirm the formation of metal tubes. TEM photographs show the formation of bilayer tubes and selected area electron diffraction results indicate gold and silver nanotubes grow along the [100],[110] respectively. In this study, we also use polycarbonate track-etched membrane as templates to synthesize polyaniline nanotubes. Owing to different characteristics of the two templates, the morphology of the polyaniline tubes synthesized in them are different. Polyaniline tubes firmed in channels of anodic alumina membrane are conform gold, silver and palladium deposited are highly crystalline nanotubes. Polyaniline tubes formed in polycarbonate membrane are not uniform, hence only gold or silver particles are deposited on local areas.
ju, yu hui, and 游蕙如. "new chical polyaniline." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/18112536780359026850.
Full text國立清華大學
化學系
90
Abstract New chiral aniline copolymers containing L-cysteine substituent have been first prepared from unsubstituted polyaniline, utilizing a concurrent reduction and substitution reaction performed in the solid-state matrix of polyaniline. The chemical, electrical and chiroptical properties of the resultant copolymer powder have been characterized by XPS, ATRIR, CV, UV-vis, CD ( circular dichroism ) spectroscopy. The resultant copolymer powder was found to contain ca. 24 mol % (based on atomic ratio S/(N-S) measured by XPS ) of L-cysteine group and are very conductive (2 S/cm ). XPS spectra of PAN-L-Cys show a newly appeared S 2p line at around 163.6 eV, confirming the formation of the sulfide linkage. The ATRIR spectrum of the resulting aniline copolymer powder clearly showed reduction in the intensities of the peaks associated with diiminoquinoid ring at 1600 cm-1 (C=C stretching vibration of diiminoquinoid ring ). The oxidation potential E0 of the resulting aniline copolymer was lower than that of parent polyaniline. This result is consistent with the expectation that the attachment of electron-donating L-cysteine group that help lower the oxidation potential of polyaniline backbone . The UV-vis spectra of the resulting aniline copolymer showed that the lmax of the p-p* transition band is longer than the corresponding band of the parent unsubstituted polyaniline, possibly due to the enhanced electron density of the copolymer backbone as contributed by the electron-donating L-cysteine group. The corresponding CD spectra for PAN-L-Cys and PAN-D-Cys ( in NMP solutions ) are mirror image of each other, indicating that these two chiral form of polyaniline possess opposite handedness.
Chiang, Cheng-Hsien, and 江政憲. "Electropolymerization of polyaniline." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/345g6d.
Full text國立臺北科技大學
有機高分子研究所
100
The research consists of three sections. The first section involves the electropolymerization of aniline under different enviroments. The variables are electrolytes, doping chemicals. The stracture-properties relationships are elucidated. The second section illustrate the electropolymerization of aniline and pyrrole. The copolymerization of thiophene and aniline is also studied. The electrical conductivity is elucidated in this sections. The third section involve the silane modification of aniline to increase the thermal stability of the copolymer. The thermal phenomena are elucidated in this research.
Chen, Yi-Jie, and 陳怡潔. "Structure and properties of water-soluble polyaniline and porous polyaniline membrane." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04897272703282890330.
Full text長庚大學
化工與材料工程研究所
95
Polyaniline is an intrinsically conducting polymer because of ease in preparation and good environment stability; therefore it has potential for electronics industry applications. Since it is limited in solubility of most common solvents and only soluble in solvents with high boiling points, it causes a lot of difficulties on the manufacturing process. In this thesis, a water soluble conducting polyaniline was prepared by hydrogen bond interaction with formic acid, succinic acid, benzoic acid, malonic acid and poly acrylic acid. The dialysis time effect on the doping level of polyaniline was analyzed by UV-Vis near IR. It was also found by FT-IR spectra that only a little amount of carboxylic acid was used to make polyaniline soluble in water. After doping with succinic acid for 8 hrs, the conductivities of solid polyaniline film increase from 3.1×10-9 up to 3.6×10-3 S/cm, a six orders increasing, as measured by conductivity and EPR analysis. In XRD spectra, the structures of polyaniline changed from amorphous phase to crystalline phase after doping with carboxylic acid. After doping with either formic acid or succinic acid, no toxic effect of polyailine film on the growth of HEK 293 cells was found. The HEK 293 cells even grew better in PAn-SA film as analyzed by HEK 293 cells biocompatibility tests. Meanwhile, a porpous membrane polyaniline and polyaniline blended membrane was prepared by a simple freeze gel method. After the extraction of ethanol, the smaller pore size and denser structure of the blended membrane was observed as measured by SEM.
Chung, Wei Ming, and 陳偉明. "Study of polyaniline complex." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/a47atf.
Full textYou, Yun-wen, and 尤韻雯. "Preparation and characterization of Fe3O4 nanowire–polyaniline composites and Ag nanowire-polyaniline composites." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/14663905001244124071.
Full text國立中央大學
化學工程與材料工程研究所
97
In this thesis, we study two research topics: one is the composite of Fe3O4 nanowire and polyaniline, the other is the composite of silver nanowire and polyaniline. In the first part, the Fe3O4 nanowires (diameter: 50nm, aspect ratio: 150) were previously dispersed in the polyethylene glycols (PEG) solution obtained from Industrial Technology Research Institute. Fe3O4-polyaniline was prepared by polymerization of aniline in the presence of Fe3O4 nanowires, dodecylbenzenesulfonic acid (DBSA) and ammonium persulfate (APS). We varied the relative amount of Fe3O4 nanowires to aniline monomer. The morphology of core-shell structure was observed by SEM and TEM. FTIR spectra show functional groups of polyaniline synthesized. TGA was used to measure the content of Fe3O4 nanowires. Vibrating sample magnetometer (VSM) was used to measure the magnetic properties. Four-Point Probe method was used to measure the conductivity. The prepared composites show both properties of conductivity and magnetism. The thermal stability of the polymer can be enhanced by forming the composites. In the second part, the Ag nanowires were previously dispersed in polyvinylpyrrolidone solution obtained from Industrial Technology Research Institute. Ag nanowires -polyaniline was prepared by five different methods. Four methods were prepared in aqueous solution, and one of the methods was prepared in chloroform solution. We use thioglycolic acid to modify the surface of Ag nanowire, and then polymerization of aniline occurs near the surface of Ag nanowires. The morphology of core-shell structure was observed by SEM and TEM. FTIR spectra show functional groups of polyaniline synthesized. TGA was used to measure the content of Ag nanowires. Semiconductor parameter analyzer was used to measure the conductivity. The composites prepared by using thioglycolic acid as dopant, and ammonium persulfate (APS) as the oxidant were the best.
Chen, Kang-Hung, and 陳岡宏. "The study of montmorillonite/epoxy, montmorillonite/polyaniline and polyaniline tubes in nano-materials." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/54035787015932969513.
Full text"Electrochemistry of Polyaniline-DNA System." East Tennessee State University, 2004. http://etd-submit.etsu.edu/etd/theses/available/etd-0331104-130134/.
Full textLevin, Zachary Solomon. "Polyaniline-Based Nanocomposite Strain Sensors." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10322.
Full textChen, Chien-Hsiang, and 陳建翔. "Electrical Property of Polyaniline Nanofibers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/t22rku.
Full text國立交通大學
電子物理系所
96
We present temperature dependent current-voltage behaviors of doped-PANI/HCl nanofiber devices with a two-probe configuration. The contribution of electrical transport result not only from the intrinsic PANI/HCl nanofibers but also from the contact. In order to reduce the contact resistance so as to obtain the intrinsic electrical property of the PANI/HCl nanofibers, the contacts of our nanofiber devices were exposed to the electron beam in the scanning electron microscope. The temperature dependent resistance of our PANI/HCl nanofiber devices reveal a negative temperature dependence (dρ/dT <0) and display semiconducting behaviors. The resistance can be fitted well with the variable range hopping (VRH) model, and the dimensional parameter p lie in the range of 1 - 10. The conduction can be understood as electron hopping between localized states in a disorder system. Moreover, we found that the nanofiber devices with low room-temperature resistances could exhibit intrinsic electrical properties of PANI/HCl nanofibers which the p value smaller than 3 so we argue that PANI/HCl nanofibers could be taken as a quasi-one dimension system. On the other hand, the nanofiber devices with high room-temperature resistances show contact electrical properties with the dimensional parameter p > 3.
White, Honda, and 白鴻達. "Synthesis of zeolite encapsulated polyaniline." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/99583335277678670054.
Full text國立中央大學
化學工程研究所
82
The polymerization of polyaniline in appropriate zeolite inrder to synthesize isolated straight chain polymer with fewefects. This series of studies try to intercalate polyanilinen different zeolites with different pore size in three methods: nilium ion exchange oxidative polymerrization, vacuum adsorptionxidative polymerization and photopolymerization. In anilium ionxchange oxidative polymerization, the polymer is identified asolyaniline from IR,UV-Vis and NMR spectrum. The delocalizationf polyaniline's electrons is characterized by EPR. The weightverage molecular weight of the polymer was characterized byPC and was between 1200-3000. In vacuum adsorption oxidativeolymerization, we prove the polymers polymerizing in the poress polyaniline by IR spectrum,the weight average molecular weights smaller than that of anilium ion exchange oxidativeolymerization. In photopolymerization, we can judge if theeaction occurs by observing the change of colors apparently.
Chih, Yi-Kai, and 池易楷. "Nanomaterials of Self-Doped Polyaniline." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/61861576625777819608.
Full text南台科技大學
化學工程系
93
Polyaniline (PANI) is a conducting polymer that has been widely studied for electronic and optical applications. Which the investigation of materials with nanotubular structure is of great importance from both scientific and technological points of view due to their unique propertied and promising potential applications in nanodevices. In recent year, PANI nanostructures, including nanowires, nanotubes, and nanofibers have been studied with the expectation that such materials will possess a variety of advantages. In this,Self-doping polyaniline (SPANI) nanofibers were synthesized by using self-assembly process consisting of a self-doping monomer (o-aminobenzenesulfonic acid, SAN) and aniline (AN). SAN plays the key roles of a self-doping monomer and a surfactant in the process of forming nanostructures. TEM and SEM results revealed that the morphology, average diameter of the resulting nanostructures depended on the mole ratio of AN to SAN and reaction conditions. NMR, FTIR, XPS, UV-Vis spectra were used to describe the molecular structures of the nanostructures. X-ray diffraction was used to characterize the degree of order in nanometer range structures. Results revealed that the molecular structures of polymer chains were similar to those of the emeraldine form of polyaniline (PANI). The doping degree ranged from 21 to 27 % corresponding to the AN/SAN mole ratio from 4 to 1. In the second part, The self-doped polyaniline demonstrates nanotube and nanofibril structures corresponding to the AN/SAN mole ratio of 4 and 1, respectively, through the examination of transmission electron microscopy. Reduction of ionic silver along the nanotubes resulted in the production of nanorod about 140 nm in diameter. An immersing self-assembly method was developed to buildup an SPANI nanofibril or nanofilm on an ITO glass, providing an electrode material to fabricate a stable electrochromic device. Total solid-state electrochromic device was fabricated under atmospheric conditions and presented the following configuration: ITO ∣ SPANI nanofilm ∥ WPU/LiClO4∥ PEDOT-PSS∣ITO This device showed blue at +1.5 V and pale grey at -1.5 V with respect to a SPANI potential, respectively.
Kabomo, Tlhabologo Moses. "Properties of nanometal-polyaniline composites." Thesis, 2011. http://hdl.handle.net/10539/10307.
Full textHuang, Yi-Ming, and 黃逸閩. "Iron Corrosion Inhibition by Polyaniline." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/30886214844522247250.
Full text淡江大學
化學學系碩士班
96
In this research, p-PANI was prepared in a solution containing 0.15 M aniline and 0.20 M phosphoric acid (pH = 2.19) on a low carbon steel (SAE 1018) substrate by a 2.00 V DC power source in order to study the anti-corrosion effect of the electropolymerized film. Comparing the corrosion potential of p-PANI/steel with the bare steel by the Tafel plot (scanning rate, 1 mV/s; potential range, -0.9 V to -0.1 V), the former is 111 mV higher than the latter. The blue p-PANI had two XRD peaks at 2θ = 20.35° and 25.48°. They are probably due to the long range ordering of the quinoid and benzenoid rings. The rings have a length near 4.39 Å and the parallel packed polymers have a van der Waal distance of 3.51 Å. FT-IR spectra of the p-PANI show absorption bands at 1578 cm-1 and 1490 cm-1 corresponding to the quinoid (C=N) and benzenoid (C=C) rings, respectively. The p-PANI/steel film has a porous morphology observed under SEM. Dissolving the p-PANI in DMF, the 618 nm absorption corresponding to the π-π*transition is found in the UV-Vis spectra that is a characteristic peak of emeraldine base. Adding a PPDT, poly(2-N-phenylamino-4,6-dimercapto-S-triazine), layer between PANI and steel. PPDT is strongly adsorbed on the surface of steel and allows low permeability of water and oxygen. As a consequence, the corrosion potential of p-PANI/PPDT/steel is further increased, 200 mV higher than the bare steel. Hence, the p-PANI/PPDT bilayer material has a better anti-corrosion effect.
Tang, Shiow-Jing, and 湯秀靜. "Synthesis and characterization of polyaniline." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78749842992720593762.
Full text中原大學
應用物理研究所
99
Effects from various initial molar ratios of aniline, APS, and HCl ([AN]:[APS]:[HCl]) on the polymerization of aniline were investigated. First, a scheme derived from a molecular point of view was proposed to distinguish the formation mechanisms based on their initial conditions. Then, by choosing a relatively low ratio of [APS]/[AN] = 0.23 at [AN] = 0.27 M, three cases can be categorized according to this scheme: (A) [AN] >> [HCl], (B) [AN] slightly larger than [HCl], and (C) [AN] < [HCl]. For case (A), the initial solution has a richness of neutral anilines. Both the doped and dedoped samples are confirmed to have features of phenazine-like oligomers. For case (C), neutral anilines are almost protonated to become anilinium cations. The final products possess features of polyaniline. For case (B), the samples possess both features from cases (A) and (C). Finally, the formation mechanisms for polymerization of aniline were discussed. Polyaniline (PANI) films consisted of emeraldine base (EB) powders made by various pressing pressures p and sandwiched by two Au-electrodes are characterized by current-voltage (I-V) measurements. A linear behavior in I-V curves is observed and from which the dark electrical conductivity of the sandwiched Au/PANI/Au sample is deduced. The sample is then put into a cryostat to study the variations in upon dynamic vacuum-pumping and under cooling processes. During dynamic vacuum-pumping process, H2O molecules inside the film are gradually removed from the lateral edge, thus, decreases. The temporal decay in (t) of these dedoped PANI films can be fitted via a stretched exponential function and from which the decay exponent and decay time constant associated with the diffusion of H2O molecules out of the as-pressed film can be obtained. The relations for and with respect to p are discussed, respectively. Next, by measuring the temperature dependence of (T) of these dedoped PANI films, the charge-carriers transport is discussed in terms of 1D variable-range-hopping model and Arrhenius activated-barrier-crossing model, respectively. Finally, the physical significance from the fitting results is discussed. Electrical characterization of pelletized samples made from polyaniline (PANI), phenazine-like aniline oligomer (PZAO) and PANI/PZAO composite together with the effects from de-doping and re-doping were studied. A numerical fit by using Arrhenius nearest-neighbor hopping, quasi-1D and 3D variable-range hopping models was applied. For samples composed of PANI nanogranules/nanofibers obtained at high [HCl] = 1.0 M, both as-prepared and re-doped samples possess high σDC with a weak T-dependence due to the dopants effects; and small EA (4.8 and 18 meV) for nearest-neighbor hopping and large L and N(EF) for quasi-1D and 3D variable-range hopping were obtained. After de-doping, low σDC with a strong T-dependence was obtained and large EA (520 meV) and small L and N(EF) were resulted. For samples composed of planar PZAO structure obtained at [HCl] = 0.10 M, σDC becomes very small. Both as-prepared and re-doped samples possess high EA (510 and 580 meV), and after de-doping EA increases (870 meV). For samples composed of PANI/PZAO composites obtained at [HCl] = 0.20 M, both as-prepared and re-doped samples possess relatively high σDC at 320 K and low EA (33 and 41 meV); and after de-doping, EA increases again (420 meV).