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유성일,Thu Trang Do,Ye Eun Ha,Mi Young Jo,Juyun Park,Yong-Cheol Kang,Joo Hyun Kim 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
Inverted bulk hetero-junction polymer solar cells (iPSC) composed of P3HT/PC61BM blends on the ZnO modified with benzoic acid derivatives-based self-assembled monolayers (SAM) are fabricated. Compared with the device using the pristine ZnO, the devices with ZnO surface modified SAMs derived from benzoic acid such as 4-(diphenylamino)benzoic acid (DPA-BA) and 4-(9H-carbazol-9-yl)benzoic acid (Cz-BA) as an electron transporting layer show improved the performances. It is mainly attributed to the favorable interface dipole at the interface between ZnO and the active layer, the eective passivation of the ZnO surface traps, decrease of the work function and facilitating transport of electron from PCBM to ITO electrode. The power conversion eciency (PCE) of iPSCs based on DPA-BA and Cz-BA treated ZnO reaches 2.78 and 2.88%, respectively, while the PCE of the device based on untreated ZnO is 2.49%. The open circuit voltage values (Voc) of the devices with bare ZnO and SAM treated ZnO are not much different. Whereas, higher the fill factor (FF) and lower the series resistance (Rs) are obtained in the devices with SAMs modification.
유성일,윤상현,손병혁 한국고분자학회 2004 고분자 과학과 기술 Vol.15 No.3
블록공중합체를 한 블록에 대해서만 선택적인 용매에 용해시키면 자발적인 상분리에 의하여 크기가 50 nm에서 200 nm 정도인 마이셀 구조로 자기 조립되며, 그 크기와 형태는 벌크상에서와 마찬가지로 블록공중합체의 분자량, 각 블록의 부피비, 각 블록간과 블록과 용매간의 Flory-Huggins 상호작용계수 ($\chi$)등에 의해서 결정된다. (중략)
Micro-contact printing of polydiacetylene liposomes using a surface-modified PDMS stamp
유성일,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Micron-sized polydiacetylene (PDA) liposome patterns have been fabricated on titanium (Ti) substrates using micro-contact printing (μ-CP) techniques. Two types of stamps (PDMS and agarose) and inking methods (“soaking” and “dropping”) are used for μ-CP, and we compare their effect on the morphology of the PDA patterns. When the agarose stamp is inked by the “dropping” method, PDA patterns are most efficiently transferred to the Ti substrate. However, the thickness of the transferred PDA patterns is not homogeneous, with the edge of the transferred pattern being thicker than its center. In contrast, when the PDMS stamp is used for μ-CP, the center of the pattern is thicker than the edge. Red fluorescence patterns are readily obtained by heat treatment of the PDA-immobilized solid substrate.
Flexible, fiber-shaped supercapacitors with roll-type assembly
유성일,Bebi Patil,안희준 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Afiber-shaped supercapacitor (FSC) with a unique roll-type configuration is developed by simply rollingpolyaniline-coated carbonfiber bundle electrodes with an H2SO4/polyvinyl alcohol gel electrolyte. Theroll-type polyaniline-coated carbonfibers FSC exhibits four times higher capacitance retention than thetwist-typefiber-shaped supercapacitor and shows an energy density of 2.97 Wh kg 1 at a power densityof 4 kW kg 1, which is almost three orders of magnitude higher than that of the twist-type FSC(0.004 Wh kg 1). The enhanced performance of the roll-type FSC is attributable to its unique roll-typeconfiguration, which creates a short and consistent distance between the electrodes.
유성일,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Polydiacetylenes (PDAs), a family of conjugated polymers that have alternating ene-yne backbone structures, are intriguing substances in several respects. First, PDAs are produced by radiation (UV or γ-ray)- induced polymerization of molecularly-assembled diacetylene monomers in the absence of chemical initiators or catalysts. Second, in general the resultant polymer displays an intense blue color which has a maximum absorption wavelength at around 640 nm. Lastly, the blue-colored PDAs undergo a color transition to form a red phase in response to a variety of environmental stimulations, such as heat, solvent, mechanical stress, and molecular recognition. Owing to the blue-to-red chromic transition and nonlinear optical properties, PDAs have been extensively investigated as potential chemosensors and photonic materials. Recently, fabrication of patterned images on solid substrates using functionalized PDAs has gained much attention. Crooks and his coworkers reported photolithographic creation of microsized patterns on Au films using thiol derived self-assembled diacetylenes. Direct generation of nanoscale PDA images using a scanning tunneling microscopy (STM) is also an elegant example of patterned imaging. In addition, patterned fluorescence images have been generated by photolithographic polymerization of solid-supported diacetylenic lipid bilayers. More recently, we described a technique for producing patterned fluorescence images of PDA vesicles on functionalized glass substrates by using a conventional microarray spotter. In this research, micron-sized patterns of polydiacetylene liposomes are fabricated on silicon substrate using micro-contact printing in conjunction with Langmuir-Blodgett deposition. SEM and AFM revealed the morphology of the patterned PDA liposomes. Fluorescence microscopy demonstrated the capability of the PDA liposomes for sensor materials. This investigation has led to the development of a new strategy for the fabrication of conjugated polymer patterns on solid substrates. When combined with the novel optical properties of polydiacetylene, this methodology should enhance the versatility of conjugated polymers in sensor and optical applications.