Preparation of Non-Agglomerated Submicron Nickel and Copper Particles by Chemical Vapor Synthesis = 화학기상합성을 이용한 비응집 서브마이크론 니켈 그리고 구리 입자 합성에 관한 연구|RISS 상세보기

국문 초록 (Abstract)

기상 합성법을 통해 제조된 니켈 및 구리 서브마이크론 입자는 고순도 및 고결정화 이점으로 인해 다층 세라믹 커패시터(MLCC) 전극에 선호됩니다. 전자기기의 경박단소화 추세에 따라 MLCC또한 고집적화가 지속되고 있으며, 이에 따라 MLCC에 사용되는 Ni, Cu 입자도 미립화가 요구되고 있습니다. 일반적으로 기상 합성법에서 입자의 제조는 응집입자가 다수 형성되는 문제가 있습니다. 그러나 지금까지의 기상 합성법에 관한 보고에서는 분류를 통해 제거하는 방법에 대해서만 논의되어 있습니다. 따라서 본 연구에서는 Ni 및 Cu 입자의 미세화 과정에서 발생하는 응집을 억제하는 방법에 대해 논의하였습니다. 화학 증기 합성법을 사용하여 응집되지 않은 니켈 및 구리 나노입자를 준비하는 세 가지 방법을 제시합니다. 본 논문에서는 응집된 입자를 단단한 응집과 부드러운 응집으로 분류하고 단단한 응집을 물리적으로 분해될 수 없는 응집 입자로 정의하고, 이것을 억제합니다. 이는 반응기 말단에서 급냉 가스의 비효율적인 주입으로 인해 응집 입자가 발생하는 것으로 추정되며, 단순하고 새로운 구조의 설치로 급랭가스의 효율을 극대화하여 응집입자를 제거할 수 있을 것으로 판단된다. 그 결과, 응집 입자가 억제된 응집되지 않은 니켈 나노 입자가 합성되었다. 또한 입자 미립화로 인해 주입되는 과량의 급냉 가스를 최소화하기 위해 코팅제를 이용한 화학 기상 합성 방법을 개발하여 응집입자를 억제했습니다. 마지막으로 황을 첨가하여 생성된 니켈 나노입자의 형태와 응집입자의 생성을 제어하였습니다.

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기상 합성법을 통해 제조된 니켈 및 구리 서브마이크론 입자는 고순도 및 고결정화 이점으로 인해 다층 세라믹 커패시터(MLCC) 전극에 선호됩니다. 전자기기의 경박단소화 추세에 따라 MLCC또...

다국어 초록 (Multilingual Abstract)

Nickel (Ni) and copper (Cu) nanoparticles (NP) prepared via vapor phase synthesis (VPS) are preferred for multilayer ceramic capacitor (MLCC) electrodes due to their high purity and high crystallization advantages. MLCC is an electrical energy storage device that accumulates and emits electricity, and is an essential passive element that is used in smartphones, LED TVs, PCs, about 1000 to 2000 pieces. MLCC continues to be highly integrated in accordance with the trend toward lighter, thinner and smaller electronic and electronic devices. Accordingly, Ni and Cu particles used in MLCC are also being atomized. Refinement of particles in the vapor phase synthesis accelerates the formation of aggregates. However, in the reports related to the vapor phase synthesis so far, I have discussed only the method of removing agglomerated particles through classification rather than suppressing the occurrence. Therefore, I discuss how to suppress the agglomeration that occurs during the refinement of Ni and Cu particles. I present three methods for the preparation of non-agglomerated nickel and copper nanoparticles using chemical vapor synthesis. In this paper, I classify aggregated particles as hard-agglomerated and soft-agglomerated, and hard-agglomerated are defined as particles that cannot be physically decomposed. It was assumed that the generation of hard-agglomerated particles was caused by inefficient injection of quenching gas at the end of the reactor, and it was believed that a simple and new structure installation could maximize the efficiency of the quenching gas to remove hard-agglomerated particles. As a result, non-agglomerated nickel nanoparticles with suppressed hard-agglomerated particles were synthesized. In addition, in order to minimize the excess quenching gas injected due to particle atomization, and I developed a coating-assisted chemical vapor synthesis method that can be used in chemical vapor synthesis to suppress connected particles. Furthermore, by adding sulfur, the shape of the nickel nanoparticles produced and the generation of connecting particles were controlled. Consequently, in this paper, I present a method to suppress the formation of agglomerated particles, a common problem in vapor phase methods caused by industry-required particle size refinement. The text of the abstract begins here.

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목차 (Table of Contents)

ABSTRACT I
국문 초록 III
PREFACE V
NOMENCLATURE XIV
CHAPTER 1. INTRODUCTION XVII

ABSTRACT I
국문 초록 III
PREFACE V
NOMENCLATURE XIV
CHAPTER 1. INTRODUCTION XVII
1.1 Introduction of particles １
1.2 Introduction of multilayer ceramic capacitor ３
1.3 Outline of the dissertation ５
CHAPTER 2. THEORETICAL BACKGROUND ６
2.1 Preparation of particles ７
2.2 Chemical vapor synthesis １０
2.3 Vapor pressure of precursors １２
2.4 Evaporation rate １４
2.5 Reactivity and process temperature １５
2.6 Nucleation and growth of nanoparticles １７
2.7 Wulff construction １９
2.8 Terminology for assemblages of particles ２１
2.9 Monodisperse particles ２５
CHAPTER 3. CHEMICAL VAPOR SYNTHESIS OF NON-AGGLOMERATED NICKEL NANOPARTICLES BY IN-FLIGHT COATING ２７
3.1 Introduction ２８
3.2 Theoretical Basis ３１
3.3 Experimental Section ３５
3.4 Results And Discussion ４０
3.5 Conclusions ５８
CHAPTER 4. PURE COPPER NANOPARTICLES PREPARED BY COATING-ASSISTED VAPOR PHASE SYNTHESIS WITHOUT AGGLOMERATION. ５９
4.1 Introduction ６０
4.2 Experimental ６２
4.3 Results and discussion ６５
4.4 Conclusions ８２
CHAPTER 5. SULFUR-MEDIATED SYNTHESIS OF SPHERICAL NICKEL NANOPARTICLES IN A CHEMICAL VAPOR REACTOR. ８３
5.1 Introduction ８４
5.2 Methods ８６
5.3 Characterization ８８
5.4 Computational method ８９
5.5 Results and discussion ９１
5.6 Conclusions １０８
REFERENCES １０９

참고문헌 (Reference)

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