나노 다공성 물질은 부피 대비 높은 비표면적, 높은 규칙성, 균일한 물질 구조 등으로 인해 흡착성, 내구성, 안정성 등 다양한 특성을 보인다. 그로 인해 촉매, 센서, 전기전자 등 그 응용 범위가 매우 넓다. 또한 나노 다공성 소재의 종류에 따라서 기공의 크기, 분포, 조성, 표면 특성 등이 달라지기 때문에 각 응용분야에 맞춰 적절한 소재를 선택할 수 있어 중요한 기술로 인식되고 있다. 본 연구에서는 LDH를 이용하여 판상형 다공성 구조의 무기물을 제조하고 이들의 표면 성질을 이용해 ...
나노 다공성 물질은 부피 대비 높은 비표면적, 높은 규칙성, 균일한 물질 구조 등으로 인해 흡착성, 내구성, 안정성 등 다양한 특성을 보인다. 그로 인해 촉매, 센서, 전기전자 등 그 응용 범위가 매우 넓다. 또한 나노 다공성 소재의 종류에 따라서 기공의 크기, 분포, 조성, 표면 특성 등이 달라지기 때문에 각 응용분야에 맞춰 적절한 소재를 선택할 수 있어 중요한 기술로 인식되고 있다. 본 연구에서는 LDH를 이용하여 판상형 다공성 구조의 무기물을 제조하고 이들의 표면 성질을 이용해 나노 입자를 코팅하였다. Part 1에서는 넓은 비표면적을 갖는 LDH를 얻기 위해 AMO washing을 통해 porous-LDH를 합성하였고 XRD pattern과 BET 분석을 통해 확인하였다. 측정결과 300 m2/g 이상의 우수한 표면적을 가지는 판상형 다공성 구조물임을 확인하였다. Part 2에서는 silane 화합물과 silica를 사용하여 LDH 표면을 개질 (modification)시킨 후 그 구조 및 특징을 XRD pattern, FT-IR, SEM, BET 분석 등을 통해 확인하였다. Part 3에서는 금속이온 환원법과 수열처리법을 이용하여 금이온과 LDH의 비율을 달리하여 금 나노 입자로 코팅된 LDH를 제조하고 그 크기가 조절 가능함을 UV/Vis spectroscopy, SEM, TEM으로 확인하였다.
나노 다공성 물질은 부피 대비 높은 비표면적, 높은 규칙성, 균일한 물질 구조 등으로 인해 흡착성, 내구성, 안정성 등 다양한 특성을 보인다. 그로 인해 촉매, 센서, 전기전자 등 그 응용 범위가 매우 넓다. 또한 나노 다공성 소재의 종류에 따라서 기공의 크기, 분포, 조성, 표면 특성 등이 달라지기 때문에 각 응용분야에 맞춰 적절한 소재를 선택할 수 있어 중요한 기술로 인식되고 있다. 본 연구에서는 LDH를 이용하여 판상형 다공성 구조의 무기물을 제조하고 이들의 표면 성질을 이용해 나노 입자를 코팅하였다. Part 1에서는 넓은 비표면적을 갖는 LDH를 얻기 위해 AMO washing을 통해 porous-LDH를 합성하였고 XRD pattern과 BET 분석을 통해 확인하였다. 측정결과 300 m2/g 이상의 우수한 표면적을 가지는 판상형 다공성 구조물임을 확인하였다. Part 2에서는 silane 화합물과 silica를 사용하여 LDH 표면을 개질 (modification)시킨 후 그 구조 및 특징을 XRD pattern, FT-IR, SEM, BET 분석 등을 통해 확인하였다. Part 3에서는 금속이온 환원법과 수열처리법을 이용하여 금이온과 LDH의 비율을 달리하여 금 나노 입자로 코팅된 LDH를 제조하고 그 크기가 조절 가능함을 UV/Vis spectroscopy, SEM, TEM으로 확인하였다.
Many inorganic porous materials provide a large surface area, structural regularity, and specific surface functionality based on their structure and compositions. In the past few decades, they have been potentially applied to various fields such as catalysts, adsorbents, sensors, catalyst supporters...
Many inorganic porous materials provide a large surface area, structural regularity, and specific surface functionality based on their structure and compositions. In the past few decades, they have been potentially applied to various fields such as catalysts, adsorbents, sensors, catalyst supporters, electronics, and cosmetics, providing better adsorption, durability, sensibility, and structural stability. Considering the growing interest in hybrid materials in nanotechnologies, the porous inorganic materials will play an increasingly important role as a host in hybrid materials. Also, the functionality of inorganic porous materials can be tuned by simple chemical modifications with functional organic molecules or inorganic nanoparticles. In this study, we suggest porous layered double hydroxide (LDH) as a porous inorganic template for stabilizing gold nanoparticles and silica nanoparticles. Recently, the LDH have been attained significant interest for use in catalyst supports, adsorbents, polymer additives, and cosmetic ingredients due to its large surface area and highly tunable composition. In part 1, we suggest the synthetic process for porous LDH materials and provide characterizations to verify the LDH phase and porous structure. We employ the aqueous miscible organic solvent (AMO) washing to obtain the porous LDH and characterize their surface areas by BET measurement. In part 2, we modify the surface of porous LDH with silane coupling agents and commercial silica nanoparticles. The silane coupling agents are chemically crafted on the hydroxide surface of LDH. In contrast, the silica nanoparticles are assembled on the LDH surface by an electrostatic attraction between the positive LDH surface and the negative silica surface. In part 3, we decorate the gold nanoparticles on the porous LDH by using either chemical reduction or hydrothermal treatment of gold precursor. Notably, we synthesize the stable gold nanoparticles on porous LDH in aqueous solution without any organic stabilizing agents. We can control the particle size of gold nanoparticles by varying the combination of reducing chemicals. We characterize the synthesis and structure of the hybrid of gold nanoparticles and porous LDH with surface plasmon resonance of gold nanoparticles and TEM inspection, respectively. We developed a one-pot synthetic method for uniform decoration of pure gold nanoparticles on porous LDH. We also found that the hydroxide functionality of LDH plays a crucial role in the formation of gold seed and immobilizing the gold nanoparticles.
Many inorganic porous materials provide a large surface area, structural regularity, and specific surface functionality based on their structure and compositions. In the past few decades, they have been potentially applied to various fields such as catalysts, adsorbents, sensors, catalyst supporters, electronics, and cosmetics, providing better adsorption, durability, sensibility, and structural stability. Considering the growing interest in hybrid materials in nanotechnologies, the porous inorganic materials will play an increasingly important role as a host in hybrid materials. Also, the functionality of inorganic porous materials can be tuned by simple chemical modifications with functional organic molecules or inorganic nanoparticles. In this study, we suggest porous layered double hydroxide (LDH) as a porous inorganic template for stabilizing gold nanoparticles and silica nanoparticles. Recently, the LDH have been attained significant interest for use in catalyst supports, adsorbents, polymer additives, and cosmetic ingredients due to its large surface area and highly tunable composition. In part 1, we suggest the synthetic process for porous LDH materials and provide characterizations to verify the LDH phase and porous structure. We employ the aqueous miscible organic solvent (AMO) washing to obtain the porous LDH and characterize their surface areas by BET measurement. In part 2, we modify the surface of porous LDH with silane coupling agents and commercial silica nanoparticles. The silane coupling agents are chemically crafted on the hydroxide surface of LDH. In contrast, the silica nanoparticles are assembled on the LDH surface by an electrostatic attraction between the positive LDH surface and the negative silica surface. In part 3, we decorate the gold nanoparticles on the porous LDH by using either chemical reduction or hydrothermal treatment of gold precursor. Notably, we synthesize the stable gold nanoparticles on porous LDH in aqueous solution without any organic stabilizing agents. We can control the particle size of gold nanoparticles by varying the combination of reducing chemicals. We characterize the synthesis and structure of the hybrid of gold nanoparticles and porous LDH with surface plasmon resonance of gold nanoparticles and TEM inspection, respectively. We developed a one-pot synthetic method for uniform decoration of pure gold nanoparticles on porous LDH. We also found that the hydroxide functionality of LDH plays a crucial role in the formation of gold seed and immobilizing the gold nanoparticles.
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