용매의 선택에 따른 전도성 Polyaniline의 자기적 성질변화

오응주,서정선,노태호,류광선,정상국,송승기 명지대학교 자연과학연구소 1994 자연과학논문집 Vol.11 No.-

Polyaniline(emeraldine base:EB)를 pH에 따라 HCI로 1차 doping을 한후ESR을 사용하여 자기적 성질을 조사했다.또한 emeraldine base를 camphorsulfonic acid(HCSA), dodecylbenzene sulfonic acid(HDBSA)등의 산으로 1차 doping 시키고 이것을 m-cresol, acetic acid, 및 formic acid에 녹여 2차 doping을 한 후 SQUID 를 이용하여 자기적 성질을 측정하였다. Doping에 사용된 HCI용액의pH가 감소함에 따라 ESR 신호의 강도가 증가하였으며, 이로부터 doping에 따라 상자성을 나타나게 하는 화학종이 가타다는 것을아타내고 있다.m-cresol내에서 HCSA 및 HDBSA로 각각 doping된 EB-CSA/m-cresol 과 EB-DBSA/m-cresol 시료 무두 상자성을 나타내었고, 온도가 증가함에 따라 자하율값이 감소하는 경향을 나타내었다.χ?값은 2.18x10?과 7.87x10?emu/mol2-rings unit 보이며 두 스핀에 대한 Fermi 에너지 level(E?)에서의 상태밀도를 나타내는 N(E?)는 0.67과 0.24 상태(eV/2-rings unit?)로 나타났다.Camphorsulfonic ascid(HCSA)로 doping 된 EB를 m-cresol, acetic acid 및 chloroform 등 다른 용매에서 처리시 관찰된 자화율의 변화를 온도에 의존하지 않는 χ?값과 온도에 의존하는 χ? 값으로 구분하여 curie spin의 온도의존성을 규명하였다. Dependency of magnetic properties of polyaniline(emeraldine base:EB)on the pH of HCI used in doping was inverstigated by electron spin resonance spectroscopy. Emeraldine base doped with functionalized acid (primary dopant) such as camphorsulfonic acid (HCSA), dodecylbenzene sulfonic acid(HDBSA) was processed in various solvents (m-cresol, acetic acid, formic acid etc.)into homogeneous solution and free standing film and its magnetic properties were measured by SQUID. The intensity of ESR signal was increased with decrese in pH of HCL solution and paramagnetic behavior of doped polyaniline due to the formation of polaron upon doping could be confoirmed from these results. The same g value of 2.004±0.001 measured for all of the samples means that the chemical species which show paramagnetism are sasme. Polyanilines doped with HCSA and HDBSA in m-cresol showed paramagnetism and decrease in susceptibility with increase in temperature. χ? value was appered 2.18x10? and 7.87x10? emu/mol2-rings unit and N(E?) which is density of states at Fermi energy level for two spins was 0.67 and 0.24 state eV? 2rings unit? respectively. The changes in susceptibility of polyanilines doped with HCSA in m-cresol, acetic acid, formic acid etc. were divided into temperature independent χ? term and temperature dependent χ? term and temperature dependency of curie spin concentration was examined.

Tin,Copper,Silicon-Phthalocyanine과 그 유도체의 합성에 관한 연구(Organic Semiconductor의 개발Ⅰ)

오응주,송양헌 明知大學校 産業技術硏究所 1984 産業技術硏究所論文集 Vol.3 No.-

Tin, Copper, Silicon-Phthalocyanine and its derivatives which seems to possess semiconductivities were synthesized by various methods to develop the new organic semiconductors. The most desirable starting materials for the syntheses were o-cyanobenzamide. Electrical Conductivities of Tin, Copper, Silicon-Phthalocyanine were ?? at room temperature, respectively.

폴리아닐린을 이용한 전기변색소자의 제작 및 특성

오응주,이경민,민혜경,노성변,서정선 명지대학교 자연과학연구소 1995 자연과학논문집 Vol.12 No.-

ITO/폴리아닐린/고분자고체전해질/ITO구조의 전기변색소자가 제작되었다.IM p-toluenesulfonic acid 용액내에서 0.7V의 전압하에 potentiostaic method로 아닐린을 전기화학적으로 중합하여 salt form의 폴리아닐린을 ITO glass 위에 deposite시켰다.또한 화학적으로 합성한 base form의 폴리아닐린을 10? torr의 압력하에 진공승화법에 의해 ITO glass 위에 증착시켰다. PEI(polyethyleneimine)과 2-acrylamido-2-methyl-propanesulfonic acid 를 이용하여 고분자 고체전해질을 제조하였다. 제작된 ITO/polyaniline salt/고분자고체전해질/ITO 구조의 전기변색소자는 인가전압 -2.0V~+2.OV의 영역에서 무색에서 푸른색을 나타내었다.Potential pulse를 통하여 측정된 이들 변색소자의 cyvlic number 는 10? 이상으로 나타났고, 응답시간은 50ms로 생기는 전자전이를 통하여 색의 변화를 알 수 있었다. 또한 각각 변색물질로 폴리아닐린 salt 와 base를 사용하여 제작된 변색소자의 경우 I-V곡선은 counter 이온인 SO?-의 발생확률에 따라 다른 곡선을 나타내었다. Electrochromic devices(ECD) with ITO/polyaniline/polymer solid electrolyte /ITO structure were fabricated . In these devices both of poyaniline salt and base forms were deposited onto ITO conducting glass substrate by electrochemical and vacuum sublimation method, respectively, Polymer solid electrolye were prepared by the reaction of polyethyleneimine with 2-acrylamido-2-methyl-propanesulfonic acid . ECDs based on polyaniline salt showed color change from colirless to blue in the range of applied voltage of -2.OV ~+2.0V.Cyclic number and response time of these devices appear to be 10? and 50ms respectively. The color change which is relatd to teh electronic transition by the variation of electron density was observed from the UV/Vis. spectra measurement. I-V curves for ECDs based on polyaniline salt and base repectively shoe different behaviors due to the different degree of contribution of SO?- ion as a counterion for each case.

내식성 첨가물질로서 폴리아날린/금속(산화물) 복합체의 제조

조정환,오영주,최영주 고신대학교 자연과학연구소 2007 고신대학교 자연과학연구소 논문집 Vol.14 No.-

폴리아닐린 합성에는 아닐린 단량체에 파라-툴루엔설폰산(ρ-TSA)과 같은 유기도판트를 사용하였으며, 복합체 제조에는 산화알루미늄, 산화마그네슘 등의 금속 산화물이나 나노사이즈의 아연 분말을 사용하였다. 이렇게 제조한 복합체를 다양한 조성으로 수분산 바인더에 첨가하여 내식성 코팅 물질을 제조하였다. Aniline monomers and ρ-toluenesulfonic acid as a dopant were used to synthesize polyanilines, and metal oxides such as Aluminum oxides, Magnesium oxides, and metal powders such as Zinc and Aluminium were used to prepare polyaniline/metal(oxides) complexes. The coating materials for corrosion protection of metals were prepared by adding the complexes of various ratios into a water soluble binder.

공침범으로 제조한 마그네시아 부분안정화 지르코니아 소결체의 특성에 미치는 열처리 효과

이재원,오응주,정윤중,이형복 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-

The powder of ZrO₂-MgO systems prepared by co-precipitation method using ZrOCl₂· 8H₂O and MgCl₂· 6H₂O as the sintering materials. They are sintered and than heat treated to know that effects of agoing time and temperature on mechanical and electrical properties. The powder ZrO₂-MgO systems have∼30nm crystal size and tetragonal phase. The mechanical properties of these partially stabilized ZrO₂- MgO specimens are shown the best value when they are aged at 1,100℃ for 1 hr and at 1,450℃ for 10 hrs, but these are better than those, and while the specimens of 9.5 mole% in these thermal conditions. Electrical conductivities are measured as a function of temperature in the range of 500℃ to 1,000℃. The temperature dependence of electrical doncutivities is shown the activation energies by the heat reat conditions; no heat treating, heat treating at 1,100℃ for 1 hr, and heat treating at 1,450℃ for 10 hrs, and their values are 21.5㎉/㏖, 34.3㎉/㏖, and 43.5㎉/㏖, respectively.

Camphorsulfonic acid로 doping된 전도성 polyaniline의 free standing film 제조 및 용매의 선택에 따른 특성변화

정상국,오응주,서정선 명지대학교 자연과학연구소 1994 자연과학논문집 Vol.11 No.-

aniline을 0℃, 1M HCI 용액내애서 (NH4)2S208을 산화제로 사용하여 산화중합시킴에 의하여 polyanline(emeraldine salt)을 합성하였고, 이르 NH4OH로 deprotonation시켜 절연성의 emeraldine base(EB)를 합성하였다. EB를 o-chlorophenol, m-cresol, chloroform등의 용매내이서 camphorsulfonic acid(HCSA)로 DOPING 하여 높은 전도성의 polyaniline을 제조하였다.o-chlorophenol, m-cresol내에서 가공된 용액은 440nm에서의 흡수피크와 1000nm에서 시작하여 2600nm까지 점차 흡수세기가 증가하는 free carrier tail 을 보였고, 이로부터 가공된 free standing film은 ~220S/cm의 높은 전기전도도와 부분적으로 결정성인 X-선 회절패턴을 나타내었다.반면에 chloroform내에서 가공된 용액은 ~800nm에서의 localized polaron에 기인하는 흡수피크를 나타내었고, 이로부터 가공된 free standing film은 ~10??S/cm의 전기전도도와 비정형의 X-선 회절패턴을 나타내었다. 이와같이 같은 양성자산으로 doping된 polyaniline이 사공시 사용된 용매에 따른 전기도도,UV/Vis,-NIR spectra및 결정구조를 갖는 현상을 용매에 따른 고분자사슬의 conformational change로 설명하였다. Insulating polyaniline (emeraldine base :EB) was synthesized by oxidative polymerization of aniline at~0℃ in IM HCI using (NH4)2S2O8 as a oxidnt and then deprotonation in 0.1M NH4OH and was converted to highly conducing form by protonic acid doping with camphorsulfonic acid (HCSA) in various ewak or non polar solvents. Free standing films of camphorsulfonic acid doped polyamilines cast from these solvents exhibited conductivities of 10?~200S/cm which depends on the kinds ofn silvents.(e.g.~200S/cm in m-cresol, 0.1S/cm in chloroform, 0.5S/cm in formic acid etc.).Thin films spun from m-cresol slution onto quartz substrates exhibited an electronic abosorption at~440nm and a intense free carrier tail comencing at ~1000nm and steadyily increasing in intensity to ~2600nm which is consistent with delocalized electrons in polarn band supporting metalic character. On the other hand those spun from chloroform showed localized polaron absorption at 440nm and ~800nm. Also free standing films cast from m-cresol showed partly crystalline structure whereas those cast from chlorofrm showed amorphous X-ray diffraction pattern. These phenomena were explained by the changes in polymer chain conformation in different solvents.

벽면부착방식 PV시스템의 建築物 適用可能性에 關한 硏究

김재원,오민석,이성주,최인창,이응직,김회서 대한건축학회 2003 대한건축학회논문집 Vol.19 No.6

Building integrated photovoltaic(BiPV)systems can from a cohesive design, construction, and energy solution for the built environment. The benefits of building integration are well documented and are gaining significant public recognition and government support. PV cells, however, convert only a small portion of the incoming isolation in to electricity. The rest is either reflected or lost in the form of sensible heat and light. In order to judge of the Integration capability to the BIPV system, energy efficiency, capacity and integration capability is studied by considering the production quantity of electric power and U-value of PV system.

가용성 폴리피롤의 합성 및 특성분석

장관식,박종주,오응주,서정선 명지대학교 자연과학연구소 1996 자연과학논문집 Vol.13 No.-

Dodecylbenzenesulfonate와 naphthalenesulfonic acid를 음이온도판트로 사용하고 산화제로 (NH₄)₂S₂O??을 사용하여 상온에서 가용성 폴리피롤을 화학적으로 합성하였다. 제조된 폴리피롤을 여러가지 유기용매(m-cresol, 콜로포름, NMP, DMSO등)에 녹여 free standing film을 제조하였다. 폴리피롤 free standing film은 실온에서 10??∼6S/cm의 전기전도도와 15∼20MPa의 인장강도를 나타내었다. 클로로포름, m-cresol용매에서 제조한 폴리피롤 용액은 UV-Vis./NIR 스펙트라의 측정결과 근적외선영역에서의 free carrier tail 현상을 보여주었고, 폴리피롤 free standing film은 매끈한 표면을 형성하였으며 TGA 측정결과 450℃ 부근에서의 고분자의 분해에 기인되는 중량감소를 나타내었다. 제조된 폴리피롤은 PMMA 등의 고분자와의 우수한 혼합특성을 나타내었다. Doped polypyrroles with anionic dopants, dodecylbenzenesulfonate and naphthalenesulfonic acid which are soluble in various organic solvents are chemically synthesized by oxidative polymerization of pyrrole with ammonium persulfate as a oxidant. Free standing films prepared from several solvents(m-cresol, chloroform, NMP, DMSO etc.) show electrical conductivities of 10??∼6S/cm and tensile strength of 15∼20MPa. Polypyrrole solution prepared from m-cresol and chloroform shows free carrier tail in the near IR region which is attributed to the delocalization of charge carriers and free standing films prepared from these solvents shows smooth surface morphology and the weight loss due to the degradation of polymer chain around 450oC. Polypyrrole solutions prepared from m-cresol and chloroform show high degree of miscibility with PMMA and good film forming property.

PPV 공중합체의 합성 및 발광특성

민혜경,이경민,한동제,박성진,오응주 명지대학교 자연과학연구소 1997 자연과학논문집 Vol.16 No.-

Blue light emitting PPV [poly (p-phenylene vinylene)] copolymers soluble in common organic solvents are synthesized and their structural and light emitting properties are studied. Copolymers show π-π* transition in UV-Vis. spectra and their λmax shift to shorter wavelength compare to that of monomers. The PL and absorption spectrum shows the symmetric vibration modes with muror images which means that copolymers are highly, aligned. The band gap energy of these copolymers are ~3.0 eV. By introducing aliphatic hydrocarbon group into polymer main chain, the stability of copolymers is increased and no significant effects of substituents are observed.

All Plastic Inverter based on polyaniline FET

Eung Ju Oh,Byung Il Lee 한국고분자학회 2006 한국고분자학회 학술대회 연구논문 초록집 Vol.2006 No.10