臺灣博碩士論文加值系統

在過去幾十年中，已發展出製備奈米結構銀顆粒的幾種製程（例如，化學還原法、沉澱法與溶膠凝膠法），因噴霧熱裂解法可以大量製備不同尺寸（奈米與微米）且高純度的銀顆粒而成為有潛力的製程。大部分對於噴霧熱裂解的研究皆利用調整前驅物濃度達成尺寸的控制，並使用低濃度以得到小顆粒，且只有部分研究調查了造霧機的超聲波頻率與顆粒尺寸的關係，然而，此方法有著低產率且難以建立高頻率之造霧機設備的缺點，本研究建立了新的噴霧熱裂解技術以克服這些缺點。本實驗藉由雙頭噴霧熱裂解設備製備奈米結構的銀顆粒，尤其是使用醋酸銀與硝酸銀作為銀鹽類的前驅物並溶於去離子水中且不添加任何有機溶劑。藉由X光繞射儀、掃描式電子顯微鏡與穿透式電子顯微鏡分析所製備之銀粉體的物理性質，使用硝酸銀所製備的銀粉體有著比使用醋酸銀所製備的銀粉體更大的晶體尺寸，且晶體尺寸會隨著濃度增加而增加，掃描式電子顯微鏡與穿透式電子顯微鏡之結果證實了使用醋酸銀所製備的銀粉體，其形貌有著不規則的團聚形狀，同時，使用硝酸銀所製備的銀粉體有著球的形狀，且計算了奈米銀顆粒在銀粉體中所占的比例，此外，部分狀況發現團聚與Ostwald粗化的現象，因此，結果顯示雙頭噴霧熱裂解可以應用於合成奈米結構的銀顆粒。

In last decades, several techniques have been developed in order to synthesis nanostructured silver particles (e.g., chemical reduction, precipitation method, and so gel methods). Spray pyrolysis (SP) process has been known as a promising technique to produce silver particle in various size (nano and sub-micron) with high purity and mass production feasibility. Most of the previous studies in SP process directly propose size control by adjusting precursor concentration and suggested the low concentration to get small particle. Also there were only few studies investigated the correlation between ultrasound frequency of the atomizer and the particle size. However, these approaches have disadvantages such as low yield product and difficulty to built-up high frequency atomizer SP equipment. Here, we have developed a new SP technique to overcome these problems. In this study, nanostructured silver particles were synthesized via two atomized SP. In particular, two type silver acetate (AgA) and silver nitrate (AgN) were used as silver salt precursors and dissolved in DI-water without any organic solvent. The physical properties of silver powders were measured. The synthesized silver powders were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The average crystallite size of silver powders prepared from AgN has larger crystallite size than AgA and increased with the increasing concentration. SEM and TEM results affirmed that the silver particles morphology prepared from AgA has irregular aggregate shape. Meanwhile, for silver particles prepared from AgN has spherical shape. Ratio of silver nano particles in silver powders was calculated. Furthermore, aggregation and Ostwald ripening phenomenon were identified for some cases. Therefore, these results suggest that this two atomized SP could be applied to synthesis nanostructured silver particles.

Table of Contents
Abstract ii
摘要 iii
Acknowledgements iv
Table of Contents v
Table of Figures viii
List of the Tables xii
Chapter 1 Introduction 1
Chapter 2 Literature Review 3
2.1 Importance of silver nano particles 3
2.1.1 Silver properties 3
2.1.2 Silver nano particles in engineering applications 9
2.1.3 Silver nano particles in biomedical applications 12
2.2 Challenges of silver nano particles 13
2.2.1 Particle aggregation 13
2.2.2 Ostwald ripening 15
2.3 Synthesis of silver nano particles 16
2.3.1 Chemical reduction 16
2.3.2 Precipitation method 18
2.3.3 Sol-gel method 20
2.3.4 Hydrothermal synthesis 21
2.3.5 Spray Pyrolysis (SP) 22
2.4 Spray Pyrolysis (SP) equipment 26
2.4.1 Atomization of the droplets 27
2.4.2 Electrostatic deposition 29
2.5 Particles Formation Mechanism 30
2.5.1 One-particle-per-droplet 30
2.5.2 Gas-to-particle conversion 31
Chapter 3 Experimental Procedures 33
3.1 Powder preparation 33
3.2 Starting Materials 37
3.3 Experimental Equipments 37
3.4 Characterization 38
3.4.1 Thermogravimetry analysis 38
3.4.2 X-ray Diffraction 39
3.4.3 Scanning Electron Microscope 39
3.4.4 Transmission Electron Microscope 40
Chapter 4 Results and Discussion 41
4.1 Thermal Analysis 41
4.2 One atomized Spray Pyrolysis 44
4.2.1 Crystallography Structures 44
4.2.2 Particle size and Surface morphology 47
4.2.3 Particle Geometry 53
4.3 Two Atomized Spray Pyrolysis 60
4.3.1 Crystallography Structures 60
4.3.2 Particle Size and Surface Morphology 63
4.3.3 Particles geometry 73
4.4 General discussion 83
Chapter 5 Conclusions 85
Chapter 6 Future work 86
References 87

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