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以镍金属为催化剂,在600℃条件下,采用化学气相沉积法(CVD)制备碳纳米管。将制得的碳纳米管用高能球磨法处理0.5～1h后,以空气氧化法进行提纯,并研究了氧化温度对碳纳米管形貌和场发射性能的影响。用扫描电镜、Raman光谱分别对300～500℃的氧化提纯后的碳纳米管的形貌和结构进行了表征。结果表明:碳纳米管的场发射性能随温度的升高而升高,经400～450℃加热10min后,非晶碳成分减少,碳管纯度得到提高,场发射性能达到最高;当氧化温度继续升高时,碳纳米管的缺陷密度增大,非晶化程度增加,场发射特性变差。因此,通过控制氧化温度可以有效提高碳纳米管的纯度和场发射性能。
Carbon nanotubes were prepared by chemical vapor deposition (CVD) using nickel metal as a catalyst at 600 ℃. The obtained carbon nanotubes were treated by high energy ball milling for 0.5 ~ 1 h and then purified by air oxidation method. The effect of oxidation temperature on the morphology and field emission properties of carbon nanotubes was also studied. The morphology and structure of the oxidized carbon nanotubes were characterized by scanning electron microscopy and Raman spectroscopy respectively at 300 ~ 500 ℃. The results show that the field emission properties of carbon nanotubes increase with the increase of temperature. After heating at 400-450 ℃ for 10min, the composition of amorphous carbon decreases, the purity of carbon nanotubes increases, and the field emission performance reaches the maximum. When the oxidation temperature continues Increasing, the defect density of carbon nanotubes increases, the degree of amorphization increases, and the field emission characteristics deteriorate. Therefore, the purity and field emission properties of carbon nanotubes can be effectively improved by controlling the oxidation temperature.