• Membrane Journal
• /
• v.13 no.3
• /
• pp.162-173
• /
• 2003

The pseudo n-type polyaniline was prepared by doping of camphorsulfonic acid(CSA) and dodecylbenzenesulfonic acid(DBSA) as the dopants in solvent of N-methyl-2-pyrrolidinone(NMP). The dopants in polymer structure was qualitatively analyzed using FT-IR. The influence on electrochemical properties with dopant concentration of PANI film were investigated. The electrochemical characteristics of the n-type PANI electrode that coated on ITO were evaluated by cyclic voltammetry(CV) and AC impedance method. The prepared PANI were confirmed as n-type PANI from FT-IR and CV. The charge transfer resistance of film on PANI/CSA electrode were measured as 1.14{\sim}1.09k{\mu}$by AC impedance. The charge transfer resistance of PANI/DBSA electrode decreased with increasing the mole ratio of DBSA as 27.73{\sim}8.37 k{\mu}$. The double layer capacitance of PANI/CSA electrode was showed almost constant value as $13.47{\sim}14.59 {\mu}F$ and that of PANI/DBSA electrode increased with increasing mole ratio of DBSA from 0.49 to $1.20 {\mu}F$.

• Journal of the Korean Society for Precision Engineering
• /
• v.30 no.6
• /
• pp.658-664
• /
• 2013

Bending actuators composed of cellulose with an electrically conducting polymer (CP) are fabricated and their performance is characterized in the air. Two different counter ions, perchlorate and tetrafluoroborate are used as dopant ions in the polyaniline CP processing. CP-cellulose-CP trilayer and CP-cellulose bilayer samples are fabricated with different dopant ions, and their actuation performance is evaluated in terms of tip displacement, blocked force and electrical power consumption along with the humidity level and actuation frequency. The trilayer samples substantially enhanced the tip displacement compared to the bilayer ones. The actuation performance of the trilayer actuator is three times better than that of original cellulose electro-active paper (EAPap) actuator. The displacement and blocked force of CP-EAPap actuators are dependent on the humidity and frequency.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.12 no.2
• /
• pp.293-298
• /
• 2001

EB-NMP free standing film is manufactured from NMP solution of polyaniline(emeraldine base EB). Also ES(emeraldine salt EB . HCl) film is manufactured by doping of EB-NMP film with 1 mole HCI aqueous solution. And EB-mixture films containing conductor(carbon black, graphite, Ag etc.) are prepared, In this study, electromagnetic interference shielding efficiency(EMI SE) of ES free standing film ($\sigma$=5 S/cm, t=0.14mm) is 23~25 dB in the frequency range of 10 MHz~1 GHz. ES-mixture(carbon black, graphite, Ag etc.) films, polyaniline film doped camphorsulfonic acid(CSA) show higher EMI SE(30~34 dB, 36~42 dB, 44~52 dB, 34~43 dB) property than that of ES free standing film, respectively.

• Journal of the Korean Applied Science and Technology
• /
• v.23 no.3
• /
• pp.230-237
• /
• 2006

Anti-corrosive coatings for steel structures with an alternative anti-corrosive pigment, polyaniline was prepared and anti-corrosive characteristics of the prepared coatings were investigated. The structure of the polyaniline was identified by using FT-IR, UV/Vis. and TGA analysis, and the anti-corrosive properties were analyzed from the results of the salt spray experiment. We found that the anti-corrosion properties of the prepared coatings varied in accordance with the types of primer coating resins as well as with the existence and nonexistence of the top coating. In this condition, the properties of adhesion, chemical resistance, and water resistance were found to be very satisfactory when using the single-packaged urethane resin as the primer coating resin and the urethane resin as the top coating resin.

• Fashion & Textile Research Journal
• /
• v.14 no.6
• /
• pp.1018-1023
• /
• 2012

Smartphone is integrated into the daily lives of all types of people not even young generation. A touch screen display is a primary input device of a smart phone, a tablet computer, etc. While there are many tough technologies in existence, resistive and capacitive are dominant and currently lead the touch screen panel industry. And a capacitive touch screen panel widely used in smart phones is coated with a material that stores electrical charges. In this study, we tried to manufacture gloves produced with electro-conducting leather as a tool to operate a touch panel screen. Therefore, electrically conductive materials, Polyaniline(PANI), Poly(3,4-ethylenedioxythiophene) (PEDOT), and Carbon nanotubes (CNT) were applied to the surface of leather to be used as a touching operator for capacitive touch screen panel. The leather samples were treated by simple painting method; firstly, they were painted with aqueous solution containing each of the electrically conductive materials and then dried. This cycle was repeated three times. Consequently, the treated leather samples showed electrical conductivity and reasonable working performance to the capacitive touch screen. And, PANI showed the best performance and highest electrical conductivity, and then PEDOT and, CNT in decreasing order. This is because the solubilities of PANI and PEDOT show higher than dispersibility of CNT. Thus, the concentration of conducting polymers was greater than that of CNT in the treating solutions.

• Korean Journal of Materials Research
• /
• v.12 no.2
• /
• pp.146-152
• /
• 2002

Effect of polyaniline and additives on surface appearance of Zn electrodeposition was investigated by SEM and XRD analyzing. We carried out the experiment from sulfate Zinc bath containing sulfonated polyaniline, gelatin and thiourea by EG(Electrogalvanizing) simulator. Addition of polyaniline and gelatin in bath, crystal size and shape of hexagonal plane of Zn crystal reduced. Mixing of thiourea, however, brittle deposits were observed because of the difference between vertical growth and parallel growth. (1011) peak appeared with polyaniline and gelatin in XRD analysis. In case of mixing of polyaniline, gelatin and thiourea, (1011) peak appeared and intensity of Zn basal plane decreased. These results suggested that overpotential increased with addition of polyaniline and additives In bath.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2017.05a
• /
• pp.86-86
• /
• 2017

고효율의 에너지 변환 및 친환경적인 이점들을 이유로, 고분자전해질 연료전지(PEMFC)는 차세대 에너지 장치로 이목을 끌어왔다. 반면, 값비싼 백금 촉매의 이용은 연료전지의 상업적 이용에 주요한 결점으로 작용했다. 최근, Zelenay와 연구팀은 폴리아닐린-철-탄소 복합체구조에서 산소환원활성이 백금과 견주어 비슷한 성능을 낼 수 있음을 보고 하였다. Dodelet은 이러한 높은 성능이 전이금속의 영향에 의한 것일 수 있다는 주장을 하였다. 본 연구팀은 지난 연구에서 제일원리전산모사를 통해 니켈, 코발트, 구리등과 같은 전이금속이 질소가 도핑된 탄소 그래핀층에 미치는 거동을 밝혔다. 결론적으로, 금속들은 질소가 도핑된 그래핀의 전자구조를 바꿀 수 있고, 이러한 전자구조의 변화는 산소 환원반응에서 긍정적으로 작용할 수 있음을 확인하였다. 이러한 이론적 연구에 기반하여, 탄소층으로 감싼 금속은 내구성과 활성을 동시에 보유한 향후 전망있는 촉매 물질로 예상되어진다. 특히, 질소가 도핑된 탄소층으로 코팅된 철-코발트 합금은 계산을 통해 산소환원반응에서 우수할 것으로 예측되었다. 본 연구팀은 FeCo@N-C 나노입자를 직접 합성하였고, 이 촉매의 우수한 활성을 전기화학적, 구조적 관점에서 1) 질소의 도핑 효과, 2) 탄소의 두께 효과, 3) 합금효과에 집중하여 분석하였다.

• Korean Journal of Materials Research
• /
• v.17 no.8
• /
• pp.433-436
• /
• 2007

Nano-structured polyaniline have been synthesized by interfacial polymerization method at room temperature. An aqueous solution of aniline in chloroform and another solution of ammonium peroxydisulfate in doping acid were prepared at different times terminated with methanol at room temperature. SEM, UV-vis were used to characterize the polyaniline with regard to their morphology and structure. The diameter and length of polyaniline can be controlled by the reaction time. Nano-structured polyaniline were found to have superior sensitivity for volatile organic compounds(VOCs). As the reaction time to increase from 30minute to 2hours the sensitivity were decreased to VOCs vapors. The sensitivity of Nano-structured polyaniline sensor appeared to VOCs better than the sensitivity of chemical synthesis sensors. The sensitivity of Nano-structured polyaniline sensor improved benzene vapors.

• Korean Journal of Materials Research
• /
• v.16 no.6
• /
• pp.386-393
• /
• 2006

Increasing environmental concerns require to solve the problem produced due to the use of heavy metals in coating formulations. Therefore, it is necessary to develop new coating strategy employing inherently conducting polymers such as polyaniline. Polyaniline is a conductive polymer that is synthesized by oxidation polymerization, and the electrochemical and chemical polymerization are possible for the oxidation of aniline. Electrochemical oxidation polymerization produces a fine surface and although voltage control is more convenient, it require electrolytic cells, and elaborate thin film can be acquired with the polymerization. Polyaniline films were electro-polymerized on cold rolled sheets using the galvanostat mode in the oxalic acidaniline-sodium molybdate electrolyte. The structure and properties of polyaniline film were studied using Potentiostat/Galvanostat 263A, FE-SEM,, AFM, SST, Colorimetry. A high corrosion resistance of polyaniline film was observed with an increase of corrosion potential by $500{\sim}600$ mV for the substrate covered with polyaniline.

• Electrical & Electronic Materials
• /
• v.10 no.1
• /
• pp.54-60
• /
• 1997

The electrical and electromagnetic shielding properties have been investigated in polyaniline free standing films with different degrees of elongation cast from N-methyl 2-pyrrolidone(NMP) solution and camphorsulfonic acid(HCSA) doped polyaniline film. The degree of crystallinity of the crosslinked films increased with increasing the draw ratio. For the case of the oriented films doped with hydrochloric acid, we have the values of conductivities up to 173 S/cm. It is considered that the physical micro-crystalline crosslinking domains act as nucleation sites for the increase of relative crystallinity during stretching. We have obtained the value of conductivity 210 S/cm in the HCSA doped polyaniline film cast from the solvent of m-cresol, which is higher than that of the crosslinking oriented films. The electromagnetic shielding efficiency of HCSA doped polyaniline film obtained 37-41 dB in the frequency range of 10MHz-1GHlz, which is higher than that of the crosslinking oriented films. The higher value of electromagnetic shielding efficiency of HCSA doped polyaniline film suggests strong possibility of electromagnetic shielding material.