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用旋涂法在金属钛衬底上涂敷纳米金刚石,经过适当的热处理形成金刚石涂层与金属钛衬底的化学键合,即形成衬底与涂层之间的过渡层,从而为纳米金刚石颗粒提供电子,使其成为有效的发射体。用扫描电镜、原子力显微镜、X射线衍射和拉曼散射等手段分析了温度对键合效果以及场发射性能的影响,温度过高或过低都不利于提高纳米金刚石涂层的场发射性能,只有在700℃左右对样品进行热处理,才能得到较好的键合状态。改变涂膜时旋涂的次数以获得不同涂层厚度的样品,对其在700℃的相同温度下进行热处理,发现涂层过厚或过薄都不利于样品发射性能的提高。旋涂9次并于700℃热处理的样品具有较好的场发射性能,其发射阈值场强可达4.6V/μm,而15.3V/μm场强下的电流密度为59.7μA/cm2。
Nano-diamond is coated on the metallic titanium substrate by a spin-coating method, and after proper heat treatment, a chemical bond between the diamond-coated layer and the metallic titanium substrate is formed, ie, a transition layer between the substrate and the coating layer is formed to form nano-diamond particles Provide electronics to make it an effective emitter. Scanning electron microscopy, atomic force microscopy, X-ray diffraction and Raman scattering were used to analyze the effect of temperature on the bonding performance and field emission performance. If the temperature is too high or too low, the field emission performance of the nano-diamond coating will not be improved. At about 700 ℃ for heat treatment of the sample, in order to get a better bonding state. Change the number of spin-coating when changing the coating to obtain samples of different coating thickness, heat treatment at the same temperature of 700 ℃, and found that the coating is too thick or too thin are not conducive to the improvement of the emission performance of the sample. The samples that were spin-coated nine times and heat-treated at 700 ℃ have good field emission performance with emission threshold of 4.6V / μm and current density of 59.7μA / cm2 at 15.3V / μm.