• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2007년도 춘계학술발표회 초록집
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• pp.35-36
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• 2007

고분자는 다양한 산업 분야에 응용되고 있으며, 표면의 기능화 처리로 그 응용 분야를 넓히는 것이 가능하다. 본 연구에서는 고분자 (PC, PET) 표면에 N - (2 - aminoethyl) 3 -aminopropyl trimethoxysilane (AEAPS) 분자막을 Thermal CVD법에 의해 형성시키고, XPS와 수적접 촉각을 이용하여 표면 상태를 측정하였다. 또한, AEAPS 분자막에 Carboxy acid과 Pd 이온의 흡착 실험을 통해 고분자 표면에서의 amino기 작용에 대한 연구를 하였다.

• 전자공학회논문지SC
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• 제48권6호
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• pp.51-56
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• 2011

자성 산화철 나노입자(iron oxide nanoparticle, ${\gamma}-Fe_2O_3$) 표면을 기능성 유기 분자를 이용하여 아민기($-NH_2$), 카르복실기(-COOH)로 표면 처리 하였으며, 이들 기능기로 표면 처리된 산화철 나노입자를 FT-IR을 이용하여 나노입자 표면을 분석하였다. 아민기, 카르복실기로 표면처리된 산화철 나노입자 표면에 특정 배열을 갖는 21-base pair 길이의 프로브 DNA를 고정하였고, 형광 라벨(Cy5)이 부착된 상보적, 비상보적 타게트 DNA를 이용하여 고정된 프로브 DNA와 hybridization을 진행하였다. 각각의 상보적, 비상보적 타게트 DNA와 hybridization 처리한 산화철 나노입자를 confocal microscopy를 이용하여 관찰하였으며, 그 결과 산화철 나노입자를 이용하여 특정 배열의 DNA검출에 성공하였다.

• Bulletin of the Korean Chemical Society
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• 제32권12호
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• pp.4171-4175
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• 2011

Bio-functionalized gold nanoparticles (AuNPs), which bio-specifically interact with biotin-(strept)avidin, were investigated in this study. AuNPs were functionalized with a synthetically-provided biotin-linked thiol (BLT), which was synthesized by amidation of the active ester of biotin with 2-mercaptoethylamine. The BLT-attached AuNP was bio-specific for streptavidin, making it potentially useful for biosensor applications. To test the bio-specific interactions, the colors, absorption spectra and TEM images were investigated for proteins such as streptavidin, cytochrome C, myoglobin and hemoglobin. The colors and absorption spectra changed when streptavidin was added to the BLT-attached AuNP solution. However, the color and spectra did not change when the other proteins were added to the same solution. These results show that the AuNPs provided a colloidal solution with excellent stability and highly selective absorption characteristics for streptavidin as a target molecule. Proteins were also screened in order to identify a general strategy for the use of optical biosensing proteins based on AuNPs. In addition, TEM images confirmed that streptavidin led the BLT-attached AuNPs to aggregate or precipitate.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.369.1-369.1
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• 2014

Au-functionalized $WO_3$ nanotubes were synthesized using ZnO nanowire templates. Transmission electron microscopy revealed the Au nanoparticles on the outer surface of a typical $WO_3$ nanotube ranged from 5 to 25 nm. The multiple networked Au-functionalized $WO_3$ nanotube sensors showed responses of 820-3, 924% in the $NO_2$ concentration range of 1-5 ppm at $300^{\circ}C$. These responses were approximately 5-12 fold higher than those observed for pristine $WO_3$ nanotube sensors over the same $NO_2$ concentration range. A model describing the gas sensing mechanism of Au-functionalized $WO_3$ nanotubes is discussed.

• Bulletin of the Korean Chemical Society
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• 제29권2호
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• pp.405-407
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• 2008

Functionalized SAB-15 samples by octadecyltrimethoxysilane (OTC) were studied by 13C magic angle spinning (MAS) cross polarization (CP) nuclear magnetic resonance (NMR) spectroscopy. In the SBA-15 sample fully functionalized by 3-aminopropyltrimethoxysilane (APS) and OTC in 1:1 molar ratio, octadecyl chains were observed to have, on average, more trans conformation than those in the SBA-15 samples fully modified by OTC only. Our results confirm that long chain molecules tend to organize themselves better in the co-presence of short chain molecules on the surface of mesoporous materials by packing of the different length chains in an interdigitized fashion even when the short chains are long enough to have three carbons and a functional group at the ends. In addition, our results indicate that solid-state 13C CP MAS NMR spectroscopy is a simple and non-destructive method to probe the molecular structures of the domains composed of long alkyl chains.

• Macromolecular Research
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• 제16권3호
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• pp.261-266
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• 2008

A variety of end-functionalized polymers were grafted spontaneously onto multi-walled carbon nano-tubes (MWNTs) using a solution mixing process. The end-functional groups of the polymers underwent noncovalent grafting to the defect sites at the surface of the purified MWNTs through zwitterionic interaction or hydrogen bonding. The physically grafted polymers including polystyrene (PS), poly(methyl methacrylate) (PMMA), polyethylene oxide (PEO), and polydimethylsiloxane (PDMS) provided sufficient compatibility with an organic solvent or polymer matrix, such that the nanotubes could be finely dispersed in various organic media. This approach is universally applicable to a broad range of polymer-solvent pairs, ensuring highly dispersed carbon nanotubes through simple solution mixing.

• 마이크로전자및패키징학회지
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• 제27권2호
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• pp.11-17
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• 2020

본 연구에서는 Ag 금속입자가 기능화된 SnO₂ 나노선을 제작 및 저온 NO₂ 가스 센싱 특성을 평가하였다. Vapor-liquid-solid 공법을 이용하여 SnO₂ 나노선을 합성하였고, flame chemical vapour deposition 공법을 이용하여 Ag 금속입자를 SnO₂ 나노선 표면에 기능화하였다. 합성된 Ag 금속입자가 기능화된 SnO₂ 나노선을 이용하여 50℃에서 NO₂ 10 ppm에 대한 가스 센싱 테스트를 진행한 결과, 감응도(R_g/R_a) 1.252를 얻었다. 본 연구를 통하여, 금속입자가 기능화된 나노선을 이용한 저온동작 반도체식 가스센서의 산업 적용을 현실화 할 수 있을 것으로 기대된다.

• 폴리머
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• 제38권3호
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• pp.307-313
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• 2014

Poly(ethylene-co-vinyl acetate) (EVA) 중에 포함된 비닐아세테이트의 함량을 0~40 wt% 범위에서 변화시키면서, 관능화 그래핀 쉬트(functionalized graphene sheet, FGS)/EVA 복합재료의 물성 변화를 조사하였다. EVA 중 극성을 가진 비닐아세테이트의 함량이 증가할수록 FGS와의 혼화성이 증가하여, FGS의 분산이 좋아지면서 EVA의 표면 저항 감소, 모듈러스 증가가 효과적으로 발현되었다. EVA 중 비닐아세테이트의 함량이 적어 FGS와의 상호작용이 작은 경우는 계면에서의 접착력이 낮아 인장력을 부가한 경우 파괴가 급격히 진행되어 파괴점에서의 신도가 크게 감소하였다. 복합재료에서 EVA의 결정화는 FGS와의 상호작용으로 대체적으로 감소하였다. 하지만, 비닐아세테이트 함량이 작은 EVA에 소량의 FGS를 첨가한 경우는 기핵효과에 의한 결정화 촉진이 관찰되었다.

• Bulletin of the Korean Chemical Society
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• 제28권11호
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• pp.1985-1992
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• 2007

Ordered mesoporous silica (MCM-41) materials with different textural properties were prepared using alkyl (dodecyl, cetyl, eicosane) trimethyl ammonium bromide (DTAB, CTAB, ETAB, respectively) as structure directing surfactants, functionalized with amine groups and used as adsorbent for the toxic metal ions, Cr (VI), As (V), Pb (II) and Hg (II). Amino functionalization of mesoporous MCM-41 was achieved by cocondensation of N-[3-(trimethoxysilyl)-propyl] aniline with tetraethyl orthosilicate. Adsorption isotherm and adsorption capacity of the amine functionalized materials for Cr (VI), As (V), Pb (II) and Hg (II) ions were followed by inductively coupled plasma mass spectrometry (ICP-MS). Results demonstrate that amine functionalized MCM-41 prepared with ETAB showed higher adsorption capacity for Cr (VI), As (V), Pb (II) and Hg (II) ions in comparison to MCM-41 prepared with CTAB and DTAB. The higher adsorption capacity for MCM-41(ETAB) was correlated with amine content in the material (determined by CHN analysis) and relative decrease in pore volume and pore diameter. X-ray diffraction (XRD) analysis, nitrogen adsorptiondesorption measurements and Fourier Transform infrared spectrometry (FTIR) were used to follow the changes in the textural parameters and surface properties of the mesoporous materials as a result of amine functionalization to correlate with the adsorption characteristics. The adsorption process was found to depend on the pH of the medium.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2018년도 춘계학술대회 논문집
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• pp.101-101
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• 2018

Quantitative measurement of chloride ion concentration has an important role in various fields of electrochemistry, medical science, biology, metallurgy, architecture, etc. Among them, its importance of architecture is ever-growing due to unexpected degradations of building structure. These situations are caused by corrosion of reinforced concrete (RC) structure of buildings. And chloride ions are the most powerful factors of RC structure corrosion. Therefore, precise inspection of chloride ion concentration must be required to increase the accuracy of durability monitoring. Multi-walled Carbon nanotubes (MWCNTs) have high chemical resistivity, large surface area and superior electrical property. Thus, it is suitable for the channels of electrical signals made by the sensor. Silver nanoparticles were added to giving the sensing property. CuBTC, one of the metal organic frameworks (MOFs), was employed as a material to improve the sensing property because of its hydrophilicity and high surface area to volume ratio. In this study, sensing element was synthesized by various chemical reaction procedures. At first, MWCNTs were functionalized with a mixture of sulfuric acid and nitric acid because of enhancement of solubility in solution and surface activation. And functionalized MWCNTs, silver nanoparticles, and CuBTC were synthesized on PTFE membrane, one by one. Electroless deposition process was performed to deposit the silver nanoparticles. CuBTC was produced by room temperature synthesis. Surface morphology and composition analysis were characterized by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), respectively. X-ray photoelectron spectroscopy (XPS) was also performed to confirm the existence of sensing materials. The electrical properties of sensor were measured by semiconductor analyzer. The chloride ion sensing characteristics were confirmed with the variation of the resistance at 1 V.