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IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy#
신권수,조충만,최은우,김성규,김인철,박도현,강영일 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
Microgratings that were designed and fabricated to generate IR absorption spectra of SF6 and NH3 on diffraction into a specific detection angle were tested by correlation spectroscopy. The micrograting diffraction provides a reference spectrum for a target molecule, and its cross-correlation with the transmission spectrum of a gas cell is obtained by varying the diffraction angle. As our optical setup can measure the dispersive transmission spectrum and the correlation spectrum under the same conditions, the two kinds of spectra were compared directly in terms of signal-to-noise ratio (SNR). The SNR’s of the correlation spectra were a few times lower than those of the dispersed spectra; therefore, the correlation spectroscopy can hardly be placed above the dispersive spectroscopy with respect to the SNR. The merit of the correlation spectroscopy is that a rather small range of modulation wavelength is needed to identify the target. Therefore, the correlation spectroscopy would be more useful for such target molecules whose spectra consist of broad peaks spread throughout a wide wavelength range.
NH₃-O₂-Ar 혼합기체의 점화 과정에서 H₂기체의 첨가 효과에 관한 연구
신권수,배균택 崇實大學校 2000 論文集 Vol.30 No.1
The addition effect of H₂on ignition of NH₃-O₂-Ar mixtures was examined in the temperature range of 1521-2193 K and the pressures in the range of 0.86-1.78 bar behind reflected shock waves. The ignition delay times were measured by monitoring pressure profiles and the OH emissions at 1.0 cm from the end wall. To complement the experiment, computer modeling study of the ignition of NH₃-O₂-Ar mixtures was carried out using various mechanisms reported previously.
신권수,Young Kwan Cho,Kyung Lock Kim,김관 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
In this work, we describe a very simple electroless deposition method to prepare moderate-SERS-active nanostructured Pd films deposited on the glass substrates. To the best of our knowledge, this is the first report on the one-pot electroless method to deposit Pd nanostructures on the glass substrates. This method only requires the incubation of negatively charged glass substrates in ethanol-water mixture solutions of Pd(NO3)2 and butylamine at elevated temperatures. Pd films are then formed exclusively and evenly on glass substrates. Due to the aggregated structures of Pd, the SERS spectra of benzenethiol and organic isonitrile could be clearly identified using the Pd-coated glass as a SERS substrate. This one-step fabrication method of Pd thin film on glass is cost-effective and suitable for the mass production.
신권수,김지훈,김인현,김관 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.3
Hollow gold-silver bimetallic nanoparticles (AuAg-HNPs) have been synthesized and their optical and structural properties were characterized. Initially Ag nanoparticles (Ag-NPs) were prepared using poly(ethylenimine) (PEI) as a reducing and a stabilizing agent simultaneously. AuAg-HNPs could then be synthesized via galvanic replacement reaction in a PEI aqueous solution by reacting sacrificial Ag template with a precursor compound of Au, i.e., HAuCl4. Due to the presence of abundant amine functional groups in PEI, which could act as the dissolving ligand for AgCl, the precipitation problem of Ag+ in the presence of Cl from HAuCl4 salt was avoided. On this basis, the relatively high concentrations of HAuCl4 and PEI-stabilized Ag nanoparticles could be used for the fabrication of AuAg-HNPs. Because of their increased surface areas and reduced densities, the AuAg-HNPs were expected and confirmed to outperform their solid counterparts in applications such as catalysis for the reduction of 4-nitrophenol in the presence of NaBH4.
Surface-Enhanced Raman Scattering of Benzenethiol Adsorbed on Silver-Exchanged Copper Powders
신권수,김관,Hyunwoo Ryoo,Yoon Mi Lee 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.2
Micrometer-sized copper (mCu) powders are weakly surface-enhanced Raman scattering (SERS) active by the excitation at 632.8 nm, but nearly ineffective as a SERS substrate at 514.5 nm excitation. The SERS activity of mCu powders at both excitation wavelengths can be increased dramatically by a simple method of the galvanic exchange reaction with AgNO3 in aqueous medium. In this work, the SERS activity of the Ag-exchanged Cu powders (mCu@Ag) has been evaluated by taking a series of Raman spectra using benzenethiol (BT) as the probe molecule. It is clearly confirmed by field emission scanning electron microscopy and X-ray diffractometry that the SERS activity of mCu@Ag powders is, in fact, highly dependent on the extent of galvanic reaction.
신권수,Shin, Kuan Soo 대한화학회 1995 대한화학회지 Vol.39 No.10
메틸 라디칼과 산소 분자 사이의 반응 속도를 입사 충격파를 이용하여 1390부터 2250k 온도범위 및 1.5에서 5.3mol/$m^3$ 밀도 범위에서 213.9nm 파장에서의 메틸 라디칼의 흡수 스펙트럼을 측정하여 고찰하였다. 메틸 라디칼을 생성하기 위한 원천 분자로는 azomethane이 사용되었다. 실험 결과 $CH_3 + O_2{\rightarrow}CH_2O + OH$ 반응의 속도상수는 $k_2=1.35{\times}10^{12}\;exp( - 5900 K/T)\;cm^3 mol^{-1}s^{-1}$ 같이 표현할 수 있었다. The reaction between $CH_3$ radicals and $O_2$ was investigated in incident shock waves at temperatures between 1390 and 2250 K and densities from 1.5 to 5.3 mol/$m^{+30/3}$ using azomethane as a source of methyl radicals by following the consumption of CH3 radicals with time resolved UV absorption measurements at 213.9 nm. The rate constant expression $k_2=1.35{\times}10^{12}\;exp( - 5900 K/T)\;cm^3 mol^{-1}s^{-1}$ for the reaction of $CH_3 + O_2{\rightarrow}CH_2O + OH$ was derived.