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- 저자 : 허영덕 (검색결과 92 건)
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허영덕,송하철,국원근,Heo, Yeong-Deok,Song, Ha-Cheol,Guk, Won-Geun 대한화학회 2006 대한화학회지 Vol.50 No.1
has been synthesized using the layered organic-inorganic hybrids, Cu2(OH)3(CH3COO)·H2O as a precursor. Cubic Cu2O is synthesized by reducing Cu2(OH)3(CH3COO)·H2O with glucose in water at 75oC. The effects of precursor and glucose are investigated. The structure of Cu2(OH)3(CH3COO)·H2O plays an important role in preparing the uniform size of Cu2O.
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데칸술폰이 삽입된 니켈 화합물의 층상 구조의 열적 성질
허영덕,전태현,박용준 한국결정성장학회 1999 한국결정성장학회지 Vol.9 No.6
The synthesis and characterization of intercalated compound of decansulfonate into hydrated nickel is presented. The compound shows a layered structure as determined by high temperature powder X-ray diffraction (HTXRD). The layer distance of the product is increased from 24.7 $\AA$ to 30.5 $\AA$ by increasing the temperature which is in turn accomplished by changing the structure of the intercalated nickel compound. From the X-ray diffraction data and the decanesulfonate size, the orientation of the decanesulfonate onto the nickel layer is determined. The molecular axis of the decanesulfonate with bilayer structure is tilted to the perpendicular of the nickel layer.
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유도 라만 산란 분광기의 제작과 C_6H_6과 C_6D_6의 유도 라만 스펙트럼 측정
허영덕,조영식 단국대학교 2000 論文集 Vol.35 No.-
In this study, we constructed a nonlinear Raman Laser spectrometer and analyzed the potential applicability of this apparatus by experimenting the stimulated Raman specrtoscopy which is one of the nonlinear Raman spectroscopy. For the case of stimulated Raman scattering, the interaction between a strong pump laser and a molecule leads to an energy exchange between pump beam and Stokes or anti-Stokes beams which may result in a strong, directional output of the Raman beams. Stimulated Raman spectra of C_6H_6 and C_6D_6 are obtained. For the case of C_6H_6, stimulate Raman scaterring generate eight beams from Rayleigh beam (ν_0) in the center to the 4th Stokes beam(ν_0 + 3ν_2), where ν_2 is the ring breathing mode of benzene of 992cm^-1. The line intensity of first Stokes beam is about 30∼40% of pump beam. Therefore, the resulting Stokes efficiency including second and third Stokes is about 40∼50% of pump beam. Similar results are obtained for C_6D_6. Finally, we found taht the Raman cross section of ν_2 mode of C_6D_6 is larger than that of C_6H_6.
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허영덕,정우찬 단국대학교 1996 論文集 Vol.30 No.-
Intercalation compound between a Phenol Red and a layered double hydroxide of Al and Zn (Zn - Al - PR LDH) was directly synthesized by the hydrolysis of ZnCl_2, AlCl_3, and the Phenol Red with a NaOH solution. From X-ray diffraction studies, the orientation of the intercalation species can be roughly estimated. The size of the Phenol Red was calculated by using Alchemy Program. The length of the Phenol Red is 11.98Å. The gallery height of the Zn - Al - PR LDH which is measured from the X-ray diffraction peaks is 12.35Å. Therefore, the Phenol Red lies nearly perpendicular to the hydroxide layers. The formula of the Zn - Al - PR LDH was checked by ICP-AES and C, H, N, S elemental analysis. As increasing the stoichiometric aluminum content, the percent contents of intercalated Phenol Red in the hydroxide layers decreases. Therefore, the interaction between the Phenol Red and a hydroxide layer is dependent upon the stoichiometric aluminum content.
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허영덕,성혜진,도영락,Heo, Yeong-Deok,Seong, Hye-Jin,Do, Yeong-Rak 대한화학회 2006 대한화학회지 Vol.50 No.6
series of Ca1-xSrxS:Ce phosphors were synthesized by solid-state reactions. The Ca1-xSrxS:Ce phosphors have a strong absorption in region from 430 nm to 470 nm. The emission peaks of CaS:Ce are located at 510 nm and 570 nm. The partial replacement of Ca by Sr in Ca1-xSrxS:Ce causes a blue shift of emission wavelengths. The Ca1-xSrxS:Ce can be used as bluish green and yellow emitting phosphors for white light emitting diodes (LEDs) pumped by the blue LED. We reported the optical properties of Ca1-xSrxS:Ce phosphors for application in phosphor converted white LEDs.
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허영덕,임수미,Young-Duk Huh,Su-Mi Lim 대한화학회 2003 대한화학회지 Vol.47 No.4
$BaMg_2Al_16O_27:Eu,\SrGa_2S_4:Eu$, and ZnCdS:Ag,Cl phosphors were chosen to produce blue, green, and red emissions, respectively, under excitation from a violet light emitting diode (LED). A four-band white LED was obtained by a combination of nonabsorbed violet emission from a violet LED and blue, green, and red emissions from $BaMg_2Al_16O_27:Eu,\SrGa_2S_4:Eu$, and ZnCdS:Ag,Cl phosphors. The luminescent properties of the four-band white LED were also discussed.
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