Polypyrrole을 증착시킨 Poly(vinyl alcohol) 나노섬유 제조 및 전극용 텍스타일 센서로의 활용 가능성 탐색-딥 코팅과 현장중합 증착 방식을 중심으로-

양혁주,김재현,이승신,조길수 한국의류산업학회 2020 한국의류산업학회지 Vol.22 No.3

This study compared dip-coating and in situ polymerization methods for the development of nanofiber-based E-textile using polypyrrole. Nanofiber webs were fabricated by electrospinning an aqueous poly (vinyl alcohol) (PVA) solution. Subsequently, the PVA nanofiber web underwent thermal treatment to improve water resistance. Dip-coating and in situ polymerization methods were used to deposit polypyrrole on the surfaces of the nanofiber web. An FE-SEM analysis was also conducted to examine specimen surface characteristics along with EDS and FT-IR that analyzed the chemical bonding between polypyrrole and specimens. The line resistance and sheet resistance of the treated specimens were measured. Finally, an electrocardiogram (ECG) was measured with textile sensors made of the polypyrrole-deposited PVA nanofiber webs. The polypyrrole-deposited PVA nanofiber webs fabricated by dip-coating dissolved in the dip-coating solution and indicated damage to the nanofibers. However, in the case of in situ polymerization, polypyrrole nanoparticles were deposited on the surface and inter-web structure of the PVA nanofiber web. The resistance measurements indicated that polypyrrole-deposited PVA nanofiber webs fabricated by in situ polymerization with an average sheet resistance of 5.3 k(Ω/□). Polypyrrole-deposited PVA nanofiber webs fabricated by dip-coating showed an average sheet resistance of 57.3 k(Ω/□). Polypyrrole-deposited PVA nanofibers fabricated by in situ polymerization showed a lower line and sheet resistance; in addition, they detected the electrical activity of the heart during ECG measurements. The electrodes made from polypyrrole-deposited PVA nanofiber webs by in situ polymerization showed the best performance for sensing ECG signals among the evaluated specimens.

The Comparative Study on Vapor-Polymerization and Pressure-dependent Conductance Behavior in Polypyrrole-hybridized Membranes

자히드,Seyeong Lee,Nasir Arsalani,Kurt E. Geckeler,홍석원,윤명한 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.2

In this study, commercially available cellulose membranes were hybridized with conjugated polymer via vapor-phase polymerization using pyrrole and iron chloride as a monomer and oxidant, respectively. The iron (III) chloride layer dip-coated on the hydrophilic cellulose surface oxidized the vaporized pyrrole monomer leading to the polypyrrole–cellulose hybrid membrane. The conductivity of hybrid membrane was optimized by varying the oxidant concentration and the monomer vapor exposure time. The various surface characterizations of polypyrrole–cellulose hybrid membrane show that the conductive polypyrrole layer was uniformly deposited onto the surface of cellulose fibrous networks unlike the polypyrrole–nylon hybrid membrane prepared in the similar way. The polypyrrole-incorporated cellulose networks exhibits steeper electrical conductance increase over the vertical pressure than its nylon counterpart. Our result suggests that the polypyrrole–cellulose hybrid membrane can be applicable for a disposable high-load pressure sensor.

폴리피롤-사이클로덱스트린 혼성체를 이용한 유해화합물질의 검출

배준원 ( Joonwon Bae ) 한국공업화학회 2019 공업화학 Vol.30 No.2

폴리피롤(polypyrrole)은 전기를 전도하는 고분자로 뛰어난 전기적 신호 전달을 지니며, 사이클로덱스트린(cyclodextrin)은 환형다당류(cyclic oligosaccharide) 분자들로서 저분자량 물질을 포획할 수 있는 친환경 물질로 널리 활용되고 있다. 따라서 이들 두 가지 물질을 혼합하여 혼성체를 제조할 수 있다면 사이클로덱스트린이 host가 되어 guest 물질을 포획하였을 때 발생하는 전기 신호를 폴리피롤이 민감하게 전달할 수 있게 되어 우수한 감지 능력을 갖게 된다. 따라서 본 연구에서는 폴리피롤/사이클로덱스트린 혼성체를 간단한 수용액 방식으로 제조하여, 제조된 혼성체를 하이드로젤(hydrogel)에 도입하여 건조한 후 금 전극 위에 적용하여 대표적인 유해성 분자인 메틸파라벤(methyl paraben)을 검출할 수 있는지에 대해서 살펴보았다. 그리고 폴리피롤만으로 이루어진 물질과 비교해 봤을 때, 사이클로덱스트린의 도입 효과는 존재하는 것으로 나타났다. 이 연구는 전도성 고분자와 친환경 분자 혼성체를 유해물질 감지에 활용할 수 있는 가능성을 제시하고 있다. Polypyrrole is a typical electrical conducting polymer, which has an excellent charge transport property. Cyclodextrins are a group of toxic-free and cyclic oligosaccharide molecules, capable of capturing low molecular weight chemicals. Considering these advantages, hybrid materials of polypyrrole and cyclodextrin can be used to detect hazardous compounds. Cyclodextrin molecules can accommodate toxic chemicals by the formation of host-guest complexes and generate electric signals, which are effectively delivered by polypyrrole backbone. In this study, the polypyrrole/cyclodextrin hybrid material was prepared using a facile wet method and included into a hydrogel. Subsequently, it was applied to a simple sensor system with a gold-patterned electrode for the detection of potentially hazardous material, methyl paraben. Compared with pristine polypyrrole, it was found that the polypyrrole/cyclodextrin hybrid showed an improved performance. This study can be an example of using environmentally benign conducting polymer/cyclodextrin hybrids as sensing media.

Preparation of polypyrrole microtubules by selective deposition on peptide-decorated microtubular templates

Lee, I.,Dong, H.,Lee, S.Y. 한국물리학회 2009 Current Applied Physics Vol.9 No.4_SUP

In this study, polypyrrole microtubules were prepared by the assistance of a designer peptide. Polypyrrole clusters were deposited on the peptide-decorated tubular templates through the chemical oxidation. The tubular templates were prepared by the self-assembly of bolaamphiphile molecules following immobilization of designer peptides that have specific affinity to the polypyrrole. Due to the specific affinity of the immobilized peptide, polypyrrole clusters were selectively deposited on the peptide-immobilized template forming polypyrrole microtubules. The prepared polypyrrole microtubules showed blue shifted photoluminescence spectrum of polypyrrole clusters due to the interaction with peptide. These findings suggest that the designer peptide with its specific affinity can be applied for the selective deposition of polymeric materials and the controls on photoluminescence property.

In-situ Chemical Synthesis of Polypyrrole/Silver Nanocomposite for the Use as a Room Temperature Ammonia Gas Sensor

Gholamreza Kiani,Abolfazl Nourizad,Rahimeh Nosrati 한국섬유공학회 2018 Fibers and polymers Vol.19 No.10

Two different types of polypyrrole/Ag nanocomposites were prepared by the use of in-situ chemical polymerization of pyrrole monomers in the presence of silver nitrate. Template-free and template-assisted methods were used to the preparation of polypyrrole nanosphere/Ag nanocomposite and polypyrrole fiber/Ag nanocomposite, respectively by the use of ammonium persulfate as oxidant and lithium perchlorate (LiClO4) as dopant agent. The materials were characterized using SEM imaging and EDS analysis. Thin films of prepared nanocomposites were spin coated on interdigitated electrodes to study the ammonia gas sensing property. It was found that ammonia gas sensing performance including sensitivity, response time, and recovery time of polypyrrole fiber/Ag nanocomposite sensor is better than that of polypyrrole nanosphere/ Ag nanocomposite sensor. It was also revealed that polypyrrole fiber/Ag nanocomposite sensor was not saturated even in the presence of 250 ppm ammonia gas whereas polypyrrole nanosphere/Ag nanocomposite was saturated with 100 ppm ammonia gas concentration.

Characterization of Conductive Polypyrrole Coated Wool Yarns

Kaynak, Akif,Wang, Kijing,Hurren, Chris,Wang, Xungai The Korean Fiber Society 2002 Fibers and polymers Vol.3 No.1

Wool yams were coated with conducting Polypyrrole by chemical synthesis methods. Polymerization of pyrrole was caned out in the presence of wool yarn at various concentrations of the monomer and dopant anion. The changes in tensile, moisture absorption, and electrical Properties of the yam upon coating with conductive polypyrrole are Presented. Coating the wool yams with conductive Polypyrrole resulted in higher tenacity, higher breaking strain, and lower initial modulus. The changes in tensile properties are attributed to the changes in surface morphology due to the coating and reinforcing effect of conductive Polypyrrole. The thickness of the coating increased with the concentration of p-toluene sulfonic acid, which in turn caused a reduction in the moisture regain of the wool yin. Reducing the synthesis temperature and replacing p-toluenesulfonic acid by anthraquinone sulfonic acid resulted in a large reduction in the resistance of the yam.

MEMS 공정을 이용한 전도성 고분자 액추에이터용 마이크로 구조물의 제작

이승기 ( Lee Seung Gi ),정승환 ( Jeong Seung Hwan ) 한국센서학회 2003 센서학회지 Vol.12 No.4

일반적인 표면 마이크로머시닝 공정과 고분자의 중합공정을 결합하여 전도성 고분자인 폴리피롤 액추에이터를 제작하였다. 폴리피롤 액추에이터의 제작 공정을 검증하기 위한 가장 기본적인 구조물은 폴리피롤 캔틸레버이며 이를 이용하여 세포 조작에 응용 가능한 폴리피롤 그리퍼 및 밸브의 기본 구조물들을 제작하였다. 그리퍼는 손가락과 유사한 형태로 뼈에 해당하는 단단한 고분자와 근육에 해당하는 폴리피롤 등으로 구성된다. 밸브는 폴리피롤 캔틸레버에 유로가 결합된 형태로 제작되었다. 제안한 폴리피롤 액추에이터의 제작 공정 및 기본 구조물들은 세포 조작기구와 같은 바이오 관련 응용에 이용될 수 있을 것이다. Polypyrrole microactuators have been fabricated by the standard surface micromachining method combined with the electropolymerization of polypyrrole. The fundamental structure to verify the feasibility of the fabrication process is polypurrole cantilever. Based on these process, polypyrrole grippers and valves for the manipulation of the cell have been fabricated. Grippers have the structure of bone and muscle which are rigid polymers and polypyrrole, respectively. Valves have the assembled structure of channels with polypyrrole cantilevers. The proposed fabrication process and structures are expected to be used for bio-related applications, for example, the cell manipulation.

Preparation of Graphene–Polypyrrole Hollow Sphere by Pickering Emulsion Method and Their Electrochemical Performances as Supercapacitor Electrode

Sai Wu,Jie Tian,Xianglu Yin,Wei Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5

Graphene–polypyrrole hollow sphere composite was synthesized for the first time via Pickering emulsion polymerization using graphene oxide as Pickering stabilizer. It was found that polypyrrole and graphene were well hybrid and all graphene–polypyrrole composites had a uniform hollow sphere structure, whose diameters gradually decreased as the pyrrole content decreased. The electrochemical properties of the composites as supercapacitor electrode were investigated. The test results displayed that the specific capacitance of the optimal ratio of composite could reach 238 F/g at a current density of 1 A/g, and a 90.7% capacitance retention could be achieved after 1500 cycles, which was a significant improvement compared with the 62.2% retention of pure polypyrrole.

Preparation of polypyrrole by chemical oxidation: applications for sensor studies

S. Pavithra,R. Thejas,H. N. Anil Rao,B. S. Krishna,G. Nagaraju 한국고분자학회 2024 Macromolecular Research Vol.32 No.1

Polypyrrole has gained more attention in conducting polymer science due to its ease of preparation and many advantages. In this article, by chemical oxidation method, three different polypyrroles were prepared using ferric chloride as an oxidant, including surfactant and natural directing agent, and named the samples PPY-1, PPY-2, and PPY-3. XRD, XPS, EDX, FT-IR, SEM, and electrical conductivity was used to characterize the synthesized polypyrrole. XRD confirms that the prepared samples were polypyrrole by showing peaks in the range of 20°–23°. SEM analysis shows that the sizes are between 120 and 180 nm. The present research work is a modest attempt to demonstrate for the first-time detection of hazardous gas using natural directing agent during polypyrrole synthesis. The prepared samples were used for the sensing of butane. PPY-2 shows a high electrical conductivity of 14 × 10– 3 S cm− 1 and gas sensing with a sensitivity value of 42.03 with lesser response and recovery time. This study reveals the fabrication of low-cost materials for butane sensors.

전도성 고분자-리그닌 복합소재의 전기화학적 특성 분석

배준원,Bae, Joonwon 한국공업화학회 2022 공업화학 Vol.33 No.2

Two types of lignin materials with a different surface ionic character were used and polypyrrole layer was introduced on the lignin surface to obtain polypyrrole@lignin and polypyrrole@lignosulfonate composites using a simple chemical oxidation polymerization, reported in a previous article. Polypyrrole was effectively prepared regardless of the lignin type and the resulting composites were investigated using scanning electron microscope (SEM), cyclic voltammetry (CV), and impedance analysis. SEM and CV results showed that the obtained composites retained stable electrochemical properties after introduction of polypyrrole on the lignin surface. Impedance analyses showed that the surface properties of composites were dependent on lignin characteristics. In addition, the composites were embedded in agarose, an gelifying agent, to obtain conductive gels. It was found that the conductive gels possessed an electrical conductivity and also retained stable electrochemical properties, which indicated that the conductive gels might be useful for some applications.