Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Chosun Natural Science
Journal Basic Information
Journal DOI :
The Research Institute of Chosun Natural Science
Editor in Chief :
Volume & Issues
Volume 2, Issue 4 - Dec 2009
Volume 2, Issue 3 - Sep 2009
Volume 2, Issue 2 - Jun 2009
Volume 2, Issue 1 - Mar 2009
Selecting the target year
Photopolymerization of Vinyl Monomers Using Organic Initiators
Kim, Myoung-Hee ; Lee, Jun ; Cha, Hyo Chang ; Ham, Heui-Suk ; Woo, Hee-Gweon ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 1~12
This miniaccount presents the selective examples of our recent discoveries in the photopolymerization of vinyl monomers using the organic initiators such as hydrosilanes, poly(hydroarylsilane)s, benzoin silyl ethers, and thianthrene cation radical. In the photopolymerization of vinyl monomers with silanes polysilanes, while the polymerization yields and polymer molecular weights of the poly(MMA)s containing the silyl moieties decreased, the TGA residue yields and intensities of SiH stretching IR bands increased as the mole ratio of the silanes over MMA increased. The hydroarylsilane and poly(hydroarylsilane) seemed to influence strongly on the photopolymerizaiton of olefinic monomers as both chain initiation and chain transfer agents. For the photohomopolymerization and photocopolymerization of MA and AA, the similar trends were observed. Benzoin silyl ethers and thianthrene cation radical also exhibit the photoinitiating ability in the photopolymerization of MMA.
Recent Trends in the Development of Organic Thin Film Transistor Including SAM Dielectric
Kim, Sungsoo ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 13~17
A newly developed OTFT manufacturing process using the combination of self-assembly techniques and vapor phase polymerization method revealed that a thick
dielectric layer (100~200 nm) is not well compatible with conducting polymer electrode, thereby resulting in still recognizable contact resistance, unstable
and leaking off current. A couple of very recent studies showed that this issue may be solved by replacing such inorganic dielectric with a self-assembled monolayer or multilayer (organic) dielectric. Therefore, this short review introduces recent trends in the development of high performance thin film transistor consisting of both organic semiconductor and SAM dielectric.
Polymerization of Hydrosilanes and Vinyl Monomers in the Presence of Transition Metal Complex
Kim, Myoung-Hee ; Lee, Jun ; Cha, Hyo Chang ; Shin, Joong-Hyeok ; Woo, Hee-Gweon ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 18~23
This minireview provides the chosen examples of our recent discoveries in the polymerization of hydrosilanes, dihydrosilole, lactones, and vinyl derivatives using various catalysts. Hydrosilanes and lactones copolymerize to give poly(lactone-co-silane)s with
/Red-Al (M = Ti, Zr, Hf) catalyst. Hydrosilanes (including dihydrosilole) reduce noble metal complexes (e.g.,
) to give nanoparticles along with silicon polymers such as polysilanes, polysilole, polysiloxanes (and silicas) depending on the reaction conditions. Interestingly, phenylsilane dehydrocoupled to polyphenylsilane in the inert nitrogen atmosphere while phenylsilane dehydrocoupled to silica in the ambient air atmosphere.
(M = Fe, Co, Ni; X = Cl, Br, I) combination initiate the polymerization of vinyl monomers. In the photopolymerization of vinyl monomers using
(M = Fe, Co, Ni), the photopolymerization of MMA initiated by
(M = Fe, Co, Ni) shows while the polymerization yield decreases in the order
, the molecular weight decreases in the order
. For the photohomopolymerization and photocopolymerization of MA and AA, the similar trends were observed. The photopolymerizations are not living. Many exciting possibilities remain to be examined and some of them are demonstrated in the body of the minireview.
Electrochemistry of Tris(2,2'-bipyridyl)Ruthenium(II)-Sodium Dodecyl Sulfate in 300 mM
Ko, Young Chun ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 24~27
Electrochemistry of 1.0 mM tris(2,2'-bipyridyl)ruthenium(II) (
) in 300 mM
solution with and without sodium dodecyl sulfate (SDS) is studied. In the presence of SDS,
shifts to positive direction compared to the SDS free case. The intersection of two lines on
vs. -log[SDS] plot is measured as a critical micelle concentration (CMC), which is 3.67 mM SDS.
A New Approach to Synthesis and Photoluminescence of Silicon Nanoparticles
Kim, Beomsuk ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 28~31
We describe the synthesis and characterization of silicon nanoparticles prepared by the soluton reduction of SiCl4. These reactions produce Si nanoparticles with surfaces that are covalently terminated. The resultant organic derivatized Si nanoparticles as well as a probable distribution of Water-soluble Si nanoparticles are observed and characterized by photoluminescence(PL) spectroscopy. This work focuses originally on the organic- and water-soluble silicon nanoparticles in terms of the photoluminescence. Further this work displays probably the first layout of hydrogen terminated Si nanoparticles synthesized in solution at room temperature.
Optical Cmharacterization of Dihydrotetraphenylsilole and Nanoaggregates
Lee, Sung Gi ; Yang, Jinseok ; Choi, Tae-Eun ; Han, Joungmin ; Sohn, Honglae ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 32~36
The purpose of this project is the synthesis of dihydrosilole and its optical characterization for their applications. Dihydrosilole was synthesized from the reduction reaction of either dichlorosilole or chlorohydrosilole with lithium aluminium hydride. The reaction yield for the dihydrosilole through the latter method was higher. The optical characteristics and AIEE effect of dihydrosilole nanoaggregates was investigated for the purpose of increasing the photoluminescence efficiency. Photoluminescence efficiency of dihydrosilole nanoaggregates increased about 100 times compared to that of molecular state.
Detection of Nitroaromatic Compounds Based on Silicon Nanoparticles
Song, Jinwoo ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 37~40
Synthesis and characterization of alkyl-capped nanocrystalline silicon (R-n-Si) have been achieved from the reaction of silicontetrachloride with magnesiumsilicide. Surface of silicon nanocrystal has been derivatized with various alkyl groups (R=methyl, n-butyl, etc.). Silicon nanoparticles have been also obtained by the sonication of luminescent porous silicon. Former exhibits an emission band at 360 nm, but latter exhibits an emission band at 680 nm. In this study very sensitive detection of TNT (2,4,6-trinitrotoluene), DNT (2,4-dinitrotoluene), NB (nitrobenzene), and PA (picric acid) has been achieved in gas phase with porous silicon using photoluminescence quenching of the silicon crystallites as a transduction mode. Porous silicon are electrochemically etched from crystalline silicon wafers in an aqueous solution of hydrofluoric acid. We have characterized these silicon nanoparticles by Luminescence Spectrometer (LS 55).
Characteristic Analysis of Band Width Based on Rugate Porous Silicon Containing Photonic Nanocrystal
Kwon, Yonghee ; Han, Joungmin ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 41~44
Photonic crystals containing multiple rugate structure are prepared by electrochemical etchings. Typically etched rugate PSi prepared in this study. Etching is carried out in a Teflon cell by using a two-electrode configuration with a Pt mesh counter electrode. They exhibit sharp photonic band gaps in the optical reflectivity spectrum. This reflectivity can be tuned to appear anywhere in the visible to near-infrared spectral range, depending on the programmed etch waveform. We study the method of full width half maxima and reflectivity index control by using amplitude.
Synthesis and Optically Characterization of Bragg Structure Porous Silicon
Kim, Sung Gi ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 45~49
Electrochemical etching of heavily doped p-type silicon wafers (boron doped, <100> orientation, resistivity;
) with different current density resulting two different refractive indices resulted in DBR (Distributed Bragg Reflectors) porous silicon, which exhibited strong in-plane anisotropy of refractive index (birefringence). Dielectric stacks of birefringent porous silicon acting as distributed Bragg reflectors have two distinct reflection bands depending on the polarization of the incident linearly polarized light. This effect is caused by a three-dimensional (in plane and in depth) variation of the refraction index. Optical characteristics of DBR porous silicon were investigated.
Synthesis and Optical Chracterization of 2,5-Difunctional Siloles
Choi, Tae-Eun ; Yang, Jinseok ; Han, Joungmin ; Um, Sungyong ; Jin, Sunghoon ; Cho, Bomin ; Cho, Sungdong ;
Journal of the Chosun Natural Science, volume 2, issue 1, 2009, Pages 50~53
New functionalized siloles have been synthesized and their optical characterizations are investigated. Silole unit has been interested, since silole has a unique optical and electronic properties. Here we report the synthesis of new type of photoluminescent silole. New siloles have been characterized by NMR, FTIR, and UV-vis absorption spectroscopy. Their optical characteristics have been also investigated using photoluminescence spectroscopy. Possible applications such as OLED and chemical sensors will be presented.