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Multi-furcation assembly of charged aerosols and its application to gas sensing

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dc.contributor.advisor최만수-
dc.contributor.author배용준-
dc.date.accessioned2017-07-13T06:28:59Z-
dc.date.available2017-07-13T06:28:59Z-
dc.date.issued2017-02-
dc.identifier.other000000141331-
dc.identifier.urihttps://hdl.handle.net/10371/118590-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 기계항공공학부, 2017. 2. 최만수.-
dc.description.abstractIn this thesis, we describe a simple yet practical parallel method to realize novel multi-furcated 3D micro/nanostructures by using the assembly of charged aerosols via spatial differentiation of electric field at atmospheric condition. A combination of generating charged aerosols by spark discharge and manipulating 3D electric field together with ion-induced electrostatic lenses lead to the formation of exotic 3D multi-furcated structures consisting of nanoparticles. By changing the arrangement of dielectric pre-patterns on the silicone substrate, bi-, tri-, tetra- or penta-furcated 3D nanoparticle structures and even interconnections between neighboring structures are precisely controlled. Based on these 3D multi-furcated micro/nanostructures, we propose a novel 3D gas sensor consisting of copper oxide nanoparticles, which exhibits excellent gas sensitivity significantly superior to that of two dimensional film type by more than 200 %. Also, we fabricate the sensor array with CuO and SnO2 nanoparticle bridge structures to demonstrate the selective detecting of NO2 and H2.-
dc.description.tableofcontentsChapter 1. Introduction 1
1.1. Background of Research 2
1.2. Objectives for Research 5
1.3. References 6
Chapter 2. Multi-furcation Growth of Charged Nano-aerosols via Ion Assisted Aerosol Lithography (IAAL) 9
2.1. Introduction 10
2.2. Method 13
2.2.1. Nanoparticle generations and characterizations 13
2.2.2. Spark discharge and Ion Assisted Aerosol Lithography (IAAL) 16
2.2.3. Numerical simulation for electric field calculation 23
2.2.4. Homemade Matlab code for the particle trajectory simulation 27
2.3. Results and Discussion 29
2.3.1. Formation of multi-directional assembly with charged nanoparticles 29
2.3.2. Particle assembly simulation for the bifurcation structure 35
2.3.3. Alignment distance and angle for the bifurcation growth 41
2.3.4. Multi-furcation and spontaneous connections between structures 44
2.4. Summary 51
2.5. References 52
Chapter 3. Enhancement of the Metal Oxide Gas Sensor using Nano-aerosol Assembly Structures 55
3.1. Introduction 56
3.2. Method 58
3.2.1. Copper and tin nanoparticle generation and assembly 58
3.2.2. Characterization techniques 60
3.2.3. Gas sensor measurements 61
3.3. Results and Discussion 63
3.3.1. Network and interconnection with nanoparticle assembly 63
3.3.2. Sensitivity enhancement with multi-furcation structure of nanoparticle assembly 67
3.3.3. Selective detection of NO2 and H2 using heterogeneous metal oxide gas sensor array with nanoparticle assembly 77
3.4. Summary 90
3.5. References 91
국문초록 93
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dc.formatapplication/pdf-
dc.format.extent1697388 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoko-
dc.publisher서울대학교 대학원-
dc.subjectAerosol-
dc.subjectNanotechnology-
dc.subjectSelf-assembly-
dc.subjectNanoparticle assembly-
dc.subjectGas sensor-
dc.subject.ddc621-
dc.titleMulti-furcation assembly of charged aerosols and its application to gas sensing-
dc.typeThesis-
dc.contributor.AlternativeAuthorBae, Yongjun-
dc.description.degreeDoctor-
dc.citation.pages93-
dc.contributor.affiliation공과대학 기계항공공학부-
dc.date.awarded2017-02-
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Theses (Ph.D. / Sc.D._기계항공공학부)
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