如何精準控制奈米材料的形狀和生長方向一直以來都是製備奈米材料的熱門研究課題，因此了解材料製備過程的生長機制相對地更是重要。本研究利用兩種金奈米材料(金奈米粒子與金奈米棒)的自催化反應來觀察其生長過程與了解其生長機制，並主要以紫外光-可見光光譜儀和穿透式電子顯微鏡作為觀察工具。在金奈米粒子的自催化反應當中，發現金粒子的粒徑是隨著生長試劑的量增加而增加，而吸收特徵峰則隨著粒徑變大而隨著紅位移，材料型態仍是維持球體狀；金奈米棒進行自催化反應時會發現其長軸的特徵吸收波長藍移，造成長寬比縮短的現象。金奈米粒子的實驗結果顯示自催化反應會使金奈米粒子尺寸增加 ，然而，對於金奈米棒並沒有顯示出相同的結果，之前的研究也沒有發生類似的反應。因為自催化反應後觀察到金奈米棒的長寬比縮短，為了了解自催化反應在金奈米棒的生長機制，設計不同實驗條件(有無銀離子參與反應、CTAB量的多寡、不同比例的金奈米棒/生長試劑)來進行測試，並主要以紫外線-可見光光譜儀、火焰式原子吸收光譜儀(AA)、穿透式電子顯微鏡來觀察生長過程並推論生長機制。實驗結果表明在紫外-可見光光譜上，多餘的CTAB與金離子量的多寡對於金奈米棒長寬比縮短呈現正相關性；額外銀離子的添加會對總實驗的反應時間有關、透過AA測得離心後的上清液中存在的金離子濃度，並以TEM影像觀察金奈米棒在反應完全中止後最終生長型態，達到建立金奈米棒在進行自催化反應後的生長機制。
The precise control of the shape and growth direction of nanomaterials has long been a research hotspot in the preparation of nanomaterials, so it is relatively important to understand the growth mechanism of the material preparation process. In this study, the autocatalytic reaction of two gold nanomaterials (gold nanoparticles and gold nanorods) was used to observe the growth process and understand the growth mechanism, mainly using UV-vis spectroscopy and transmission electron microscopy as observation tools. In the self-catalytic reaction of gold nanoparticles, it was found that as the amount of growth reagents increased, the particle size increased, and with the increase of particle size, the absorption peak red-shifted, while the shape of the material remained spherical. Experimental results with gold nanoparticles showed that an autocatalytic reaction increases the size of gold nanoparticles, however, gold nanorods did not show the same result and similar reactions did not occur in previous studies. To understand the growth mechanism of AuNR after the autocatalytic reaction, different experimental conditions (presence or absence of silver ions, amount of CTAB, different ratios of AuNR/growth reagent) were designed to test the growth process and infer the main growth process. Use UV-Vis spectrophotometer, flame atomic absorption spectrometer (AA), transmission electron microscope, etc. to observe the growth process and infer the growth mechanism. The experimental results show that the amount of excess CTAB and gold ions in the UV-vis spectrum is related to the shortening of the radius ratio of gold nanorods; the addition of extra silver ions is related to the reaction time of the whole experiment. The growth mechanism of gold nanorods after the autocatalytic reaction was established.
