| 摘要: | 本研究以電漿迴旋共振化學氣相沉積法成功製備出一維氧化銦奈米結構，但在不同氧分壓下成長出了四種氧化銦奈米結構如垂直成長的奈米線、粗糙球殼、海膽狀成長的奈米線和實心球，因此啟發了對此的探討。
我們知道在電漿系統下可以高度解離氣體分子去形成高反應性的氧原子，但在不同氧分壓下，氧吸附於氧化物表面的反應程度卻不同，而推測是否在電漿處理下有助於表面的升溫並強化表面活化的可能性，因此我們將透過直接熱氧化去了解熱對銦奈米粒子的影響有多少，但在此途徑要成長出一為氧化銦奈米結構是需要夠厚的氧化層，相比於直接電將氧化是可以在奈米尺寸且低溫下成長，代表著兩者有著大大不同的成長機制，而熱氧化目前尚無法進行其他分析而進行機制的闡述。
但在電漿的分析我們利用OES針對各氧激發態的特徵波段所量測到的強度去比對各氧分壓所繪製出的關係中，來得知是否是因所產生的氧自由基有所改變才導致形成不同的氧化銦奈米結構，可以知道的是氧自由基越多越容易反應成長一維奈米結構，但卻在氧自由基的解離量數對各氧分壓的關係圖中，發現當氧分壓過高時電漿解離出的氧原子濃度會大幅下降，因此可驗證出氧化反應將會受到高濃度未解離的氧分子影響。隨著氧分壓降低發現氧激發態777.4波段強度逐漸下降但氧原子的解離量卻是逐漸的上升，此外，因為了降低至更低的氧分壓，增加了氬氣的比率，也於氬激發態750.2對各氧分壓的關係圖中，觀察到越低氧分壓下強度明顯上升，而在氬和氧氣中性物質的相互反應中，氬激發態的能量足以將氧分子解離，產生的氧自由基能量較低，但在氬激發態相互碰撞下所產生的正電荷氬離子對基板的貢獻而加速了表面擴散。因此在成長一維氧化銦奈米結構中，因氧分子或原子的吸附造成了氧化反應不同，但可透過離子對基板轟擊下使表面活化加速表面擴散而使氧化程度大幅提升。
;In this study, one-dimensional indium oxide nanostructures were successfully prepared by plasma cyclotron resonance chemical vapor deposition. However, four indium oxide nanostructures have grown under different oxygen partial pressures, such as vertically grown nanowires, rough spherical shells, sea urchin-like nanowires and solid balls. So it inspired the discussion on this.
We know that in a plasma system, gas molecules can be highly dissociated to form highly reactive oxygen atoms, but under different oxygen partial pressures, the degree of reaction of oxygen adsorption on the oxide surface is different. It is speculated whether the plasma treatment will help the surface heat up and strengthen the possibility of surface activation. Therefore, we will use direct thermal oxidation to understand how much heat affects indium nanoparticles. But to grow an indium oxide nanostructure in this way, a thick enough oxide layer is required. Compared with direct electro-oxidation, it can grow at nanometer size and low temperature, which means that the two have greatly different growth mechanisms, and thermal oxidation is currently unable to conduct other analysis to explain the mechanism.
However, in the analysis of plasma, we use the intensity measured by OES for the characteristic band of each oxygen excited state to compare the relationship drawn by each oxygen partial pressure. It can be known that the more excited oxygen states, the easier it is to grow a one-dimensional nanostructure. But in the graph of the dissociation amount of oxygen free radicals versus each oxygen partial pressure, it is found that when the oxygen partial pressure is too high, the concentration of oxygen atoms dissociated from the plasma will drop significantly, so it can be verified that the oxidation reaction will be high. The concentration of undissociated oxygen molecules is affected. As the oxygen partial pressure decreases, it is found that the intensity of the 777.4 band of the oxygen excited state gradually decreases, but the dissociation amount of oxygen atoms is gradually increased. In addition, in order to reduce the oxygen partial pressure, we increased the ratio of argon. Therefore, we also used the argon excited state 750.2 to graph the relationship between the oxygen partial pressures, and observed that the lower the oxygen partial pressure, the intensity also increased significantly. In the mutual reaction of argon and oxygen neutral substances, the energy of the excited state of argon is sufficient to dissociate oxygen molecules, and the generated oxygen radicals have lower energy, but the positively charged argon ions generated under the collision of the excited state of argon The contribution to the substrate accelerates surface diffusion. Therefore, in the growth of one-dimensional indium oxide nanostructures, the oxidation reaction is different due to the adsorption of oxygen molecules or atoms, but the surface activation can be accelerated by the ion bombardment of the substrate, and the degree of oxidation can be greatly increased. |
