Pub Date : 2001-10-01DOI: 10.1080/10587250108030099
Y. Park, Yound Il Kim, D. Baik, C. Park
Abstract The electroconductive polyacrylonitrile(PAN)/polyaniline composite can be synthesized by the electrochemical polymerization of aniline on the PAN-coated Pt electrode in acetonitrile/water medium. The electrochemical properties of PAN/polyaniline composites were investigated comparing with polyaniline.
{"title":"Electrochemical Synthesis of Polyaniline Composite Films in Acetonitrile/Water Medium","authors":"Y. Park, Yound Il Kim, D. Baik, C. Park","doi":"10.1080/10587250108030099","DOIUrl":"https://doi.org/10.1080/10587250108030099","url":null,"abstract":"Abstract The electroconductive polyacrylonitrile(PAN)/polyaniline composite can be synthesized by the electrochemical polymerization of aniline on the PAN-coated Pt electrode in acetonitrile/water medium. The electrochemical properties of PAN/polyaniline composites were investigated comparing with polyaniline.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"41 1","pages":"327 - 332"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80984095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024737
C. Lee, Eugene Kim, S. Oh
Abstract Organic electroluminescent (EL) devices with color tunable function using poly[N-(p-diphenylamine)phenylmethacrylamide], PDPMA doped by various fluorescent dyes (nile red, DCM, TPP) as a polymer hole transporting material and Alq3 as a host emitting material were fabricated. The fluorescent dyes used as guest emitting materials. The luminescence of the doped devices was significantly influenced by the amount and the structure of the fluorescent dyes. Especially, the DCM doped device emitted red light with the brightness of 1500 cd/m2.
{"title":"Electroluminescence of Organic EL Device using PDPMA Doped by Various Fluorescent Dyes","authors":"C. Lee, Eugene Kim, S. Oh","doi":"10.1080/10587250108024737","DOIUrl":"https://doi.org/10.1080/10587250108024737","url":null,"abstract":"Abstract Organic electroluminescent (EL) devices with color tunable function using poly[N-(p-diphenylamine)phenylmethacrylamide], PDPMA doped by various fluorescent dyes (nile red, DCM, TPP) as a polymer hole transporting material and Alq3 as a host emitting material were fabricated. The fluorescent dyes used as guest emitting materials. The luminescence of the doped devices was significantly influenced by the amount and the structure of the fluorescent dyes. Especially, the DCM doped device emitted red light with the brightness of 1500 cd/m2.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"6 1","pages":"265 - 268"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79865703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030045
Jeong-woo Choi, Yun-Suk Nam, Dongho Kim, W. Lee, M. Fujihira
Abstract The charge transfer characteristics of molecular homo-films composed of green fluorescence protein (GFP) were investigated by time-resolved fluorescence measurement. In this work, time-resolved fluorescence decay of GFP homo film was measured to investigate the solid-state fluorescence lifetime and to observe the charge transfer by using time-correlated single photon counting method (TCSPC).
{"title":"Time-Resolved Fluorescence Study of GFP Homo-Film","authors":"Jeong-woo Choi, Yun-Suk Nam, Dongho Kim, W. Lee, M. Fujihira","doi":"10.1080/10587250108030045","DOIUrl":"https://doi.org/10.1080/10587250108030045","url":null,"abstract":"Abstract The charge transfer characteristics of molecular homo-films composed of green fluorescence protein (GFP) were investigated by time-resolved fluorescence measurement. In this work, time-resolved fluorescence decay of GFP homo film was measured to investigate the solid-state fluorescence lifetime and to observe the charge transfer by using time-correlated single photon counting method (TCSPC).","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"9 1","pages":"93 - 96"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83195823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030077
Y. Jung, S. Ahn, H. Chae, Haeseong Lee, E. Kim, Haiwon Lee
Abstract Selective deposition of gold particles on a patterned substrate was studied for fabrication of a single electrons transistor. In the present study, a selective positioning technique was achieved using atomic force microscope (AFM). Various self-assembled monolayers (SAMs) on silicon surface such as hexamethyldisilazane (HMDS) and octadecyl dimethylmethoxy silane (ODMS) SAMs were prepared as a system for AFM lithography. A uniform pattern was engraved on the SAMs. The selective deposition of gold was efficiently accomplished. This gold particle assembly was characterized by AFM.
{"title":"The Fabrication of Gold Nanoparticle Assemblies on the Functionalized Surface Patterned by AFM Lithography","authors":"Y. Jung, S. Ahn, H. Chae, Haeseong Lee, E. Kim, Haiwon Lee","doi":"10.1080/10587250108030077","DOIUrl":"https://doi.org/10.1080/10587250108030077","url":null,"abstract":"Abstract Selective deposition of gold particles on a patterned substrate was studied for fabrication of a single electrons transistor. In the present study, a selective positioning technique was achieved using atomic force microscope (AFM). Various self-assembled monolayers (SAMs) on silicon surface such as hexamethyldisilazane (HMDS) and octadecyl dimethylmethoxy silane (ODMS) SAMs were prepared as a system for AFM lithography. A uniform pattern was engraved on the SAMs. The selective deposition of gold was efficiently accomplished. This gold particle assembly was characterized by AFM.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"67 1","pages":"231 - 234"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83957148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024761
K. Yoon, M. Kim
Abstract With controlling the amount of methyltrimethoysilane (MIMS) in silica films via sol-gel process, the surface free energy of the films has been changed. The contact angle was Measured to characterize the modifeid was determined, and correlated to the surface characteristic (hydrophobicity) of the films.
{"title":"Preparation and Characterization of Hydrophobic Modified Silica Film via Sol-Gel Process","authors":"K. Yoon, M. Kim","doi":"10.1080/10587250108024761","DOIUrl":"https://doi.org/10.1080/10587250108024761","url":null,"abstract":"Abstract With controlling the amount of methyltrimethoysilane (MIMS) in silica films via sol-gel process, the surface free energy of the films has been changed. The contact angle was Measured to characterize the modifeid was determined, and correlated to the surface characteristic (hydrophobicity) of the films.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"19 1","pages":"365 - 368"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81874001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030044
Y. Shimizu
Abstract A mesogenic long-chain tetraphenylporphyrin and its metal complexes(Ni(II), V˭O(IV) and Si(OH)2) were studied on the mesomorphism and photoconductivity in a symmetrical sandwich-type ITO cell. These complexes show so-called “lamellar-type” mesophases having a layered structure like smectic mesophase. The photocurrent behaviour of these compounds were compared to clarify the characteristic properties of photoconductivity for lamellar mesophases.
{"title":"Photoconductivity of Discotic Liquid Crystals: a Mesogenic Long-Chain Tetraphenylporphyrin and Its Metal Complexes","authors":"Y. Shimizu","doi":"10.1080/10587250108030044","DOIUrl":"https://doi.org/10.1080/10587250108030044","url":null,"abstract":"Abstract A mesogenic long-chain tetraphenylporphyrin and its metal complexes(Ni(II), V˭O(IV) and Si(OH)2) were studied on the mesomorphism and photoconductivity in a symmetrical sandwich-type ITO cell. These complexes show so-called “lamellar-type” mesophases having a layered structure like smectic mesophase. The photocurrent behaviour of these compounds were compared to clarify the characteristic properties of photoconductivity for lamellar mesophases.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1997 1","pages":"83 - 91"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72754524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024723
Tae-Woo Lee, O. Park
Abstract A single anionic conductor (SAC) was employed to improve the hole injection properties in an Al anode/SAC/poly[2-methoxy-5-(2′-(ethylhexyloxy)-1,4-phenylenevinylene) emissive layer/indium tin oxide cathode device. The SAC possesses an excellent hole-injection property, because of ionic space charge accumulation near the anode by the good chain segmental motion of the soft block in the polymer chains of the SAC. Thus, a balanced injection of an electron-hole pair can be achieved to greatly improve the quantum efficiency.
{"title":"Use of a Single Anionic Conductor as a Hole-Injecting Material for Polymer Light-Emitting Diodes","authors":"Tae-Woo Lee, O. Park","doi":"10.1080/10587250108024723","DOIUrl":"https://doi.org/10.1080/10587250108024723","url":null,"abstract":"Abstract A single anionic conductor (SAC) was employed to improve the hole injection properties in an Al anode/SAC/poly[2-methoxy-5-(2′-(ethylhexyloxy)-1,4-phenylenevinylene) emissive layer/indium tin oxide cathode device. The SAC possesses an excellent hole-injection property, because of ionic space charge accumulation near the anode by the good chain segmental motion of the soft block in the polymer chains of the SAC. Thus, a balanced injection of an electron-hole pair can be achieved to greatly improve the quantum efficiency.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1 1","pages":"207 - 210"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89872710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030055
H. Kimura-Suda, T. Sassa, T. Wada, H. Sasabe
Abstract The average direction of molecules and the absolute value of an effective second order nonlinear optical constant (∣d eff 7∣) were simultaneously determined using a new second harmonic generation (SHG) phase measurement with theoretical curve fitting. The theoretical curve fitting process was demonstrated using poled poly (methyl methacrylate) films doped with p-nitroaniline (PNA/PMMA), which were used as a reference and a sample. The second harmonic (SH) interference generated between the two poled PNA/PMMA films was modulated by rotating the phase generator inserted between the two. The fitting process derived d eff itself. The average direction of molecules was shown by the sign of d eff . The obtained value of ∣d eff ∣ was verified by that from a Maker fringe measurement. The obtained average direction of molecules coincided with that determined by a poling geometry.
{"title":"Analysis of Second Harmonic Generation Phase Measurement for Determination of Molecular Orientation and Effective Second Order Nonlinear Optical Constant","authors":"H. Kimura-Suda, T. Sassa, T. Wada, H. Sasabe","doi":"10.1080/10587250108030055","DOIUrl":"https://doi.org/10.1080/10587250108030055","url":null,"abstract":"Abstract The average direction of molecules and the absolute value of an effective second order nonlinear optical constant (∣d eff 7∣) were simultaneously determined using a new second harmonic generation (SHG) phase measurement with theoretical curve fitting. The theoretical curve fitting process was demonstrated using poled poly (methyl methacrylate) films doped with p-nitroaniline (PNA/PMMA), which were used as a reference and a sample. The second harmonic (SH) interference generated between the two poled PNA/PMMA films was modulated by rotating the phase generator inserted between the two. The fitting process derived d eff itself. The average direction of molecules was shown by the sign of d eff . The obtained value of ∣d eff ∣ was verified by that from a Maker fringe measurement. The obtained average direction of molecules coincided with that determined by a poling geometry.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"48 1","pages":"135 - 138"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75095298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024781
Ho-Sik Lee, T. Kim, Won-jae Lee, Jongwook Park, D. Kang
Abstract We have synthesized green light-emitting material, poly(3,6-N−2-ethylhexyl carbazolyl cyanotere-phthalidene)(PECCP), which has an electron-donor and electron-acceptor moiety in a repeated unit of polymer. Organic light-emitting diodes were made with PECCP Langmuir-Blodgett(LB) films in a sandwich structure between indium-tin-oxide(ITO) and aluminum electrodes. Z-type LB films were manufactured using a Kuhn type to use for an emissive layer. We have observed green photoluminescent and electroluminescent spectra at λmax = 536 nm corresponding to 2.31 eV.
{"title":"Characteristics of Organic Light-Emitting Diodes Using PECCP Langmuir-Blodgett Film as an Emissive Layer","authors":"Ho-Sik Lee, T. Kim, Won-jae Lee, Jongwook Park, D. Kang","doi":"10.1080/10587250108024781","DOIUrl":"https://doi.org/10.1080/10587250108024781","url":null,"abstract":"Abstract We have synthesized green light-emitting material, poly(3,6-N−2-ethylhexyl carbazolyl cyanotere-phthalidene)(PECCP), which has an electron-donor and electron-acceptor moiety in a repeated unit of polymer. Organic light-emitting diodes were made with PECCP Langmuir-Blodgett(LB) films in a sandwich structure between indium-tin-oxide(ITO) and aluminum electrodes. Z-type LB films were manufactured using a Kuhn type to use for an emissive layer. We have observed green photoluminescent and electroluminescent spectra at λmax = 536 nm corresponding to 2.31 eV.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"8 1","pages":"451 - 454"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75400954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030095
Kitae Song, Byoung Suhk Kim, Jae Wook Lee, H. Rhee
Abstract A conventional DSC was used to investigate the thermal curing behavior of methylsilsesquioxane (MSSQ) which transforms into the low dielectric constant material, poly(MSSQ). Temperature scan of MSSQ up to 350°C revealed that the curing of MSSQ is an endothermic reaction that occurs over the wide temperature range. From the isothermal scan of MSSQ, it was found that the curing of MSSQ follows the first-order reaction.
{"title":"DSC Studies upon Thermal Curing of Methylsilsesquinoxane","authors":"Kitae Song, Byoung Suhk Kim, Jae Wook Lee, H. Rhee","doi":"10.1080/10587250108030095","DOIUrl":"https://doi.org/10.1080/10587250108030095","url":null,"abstract":"Abstract A conventional DSC was used to investigate the thermal curing behavior of methylsilsesquioxane (MSSQ) which transforms into the low dielectric constant material, poly(MSSQ). Temperature scan of MSSQ up to 350°C revealed that the curing of MSSQ is an endothermic reaction that occurs over the wide temperature range. From the isothermal scan of MSSQ, it was found that the curing of MSSQ follows the first-order reaction.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"52 1","pages":"309 - 312"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74103269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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