Efficient growth of multi-walled carbon nanotubes by continuous-wave laser vaporization of graphite containing B4C
Efficient growth of multi-walled carbon nanotubes by continuous-wave laser vaporization of graphite containing B4C
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DOI：
10.1016/j.carbon.2010.11.033
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发表时间：
2011-04
期刊：
影响因子：
10.9
通讯作者：
F. Kokai;Iori Nozaki;T. Okada;A. Koshio;T. Kuzumaki
中科院分区：
文献类型：
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作者：
F. Kokai;Iori Nozaki;T. Okada;A. Koshio;T. Kuzumaki
采用室温连续波激光在氩气中气化含B4C的石墨靶，制备了厚度为7 ~ 70nm、长度为30μm的多壁碳纳米管（MWCNTs）。调整靶材中的硼含量和氩气压力可使MWCNTs在沉积层中的最大分数达到~ 60%。MWCNTs和石墨烯层的直线度（层间距约0.35nm）表明，生长的MWCNTs石墨化程度相当高。然而，沉积层拉曼光谱中的D、G和2D波段的特征表明MWCNTs中掺杂了硼。生长的MWCNT的表观杨氏模量测量为0.68TPa，与热处理的蒸汽生长碳纳米纤维相当。MWCNTs被认为在高达~ 2400°C的高温下，在熔融碳化硼颗粒上作为种子生长。
Multi-walled carbon nanotubes (MWCNTs), 7–70nm thick and up to 30μm long, were efficiently grown by room-temperature continuous-wave laser vaporization of a graphite target containing B4C in an ambient Ar gas. Adjusting the boron content in the target and Ar gas pressure resulted in a maximum fraction of ∼60% of MWCNTs in the deposits. The straightness of the MWCNTs and graphene layers with an interlayer spacing of ∼0.35nm indicated that the degree of graphitization was fairly high in the grown MWCNTs. However, the features of D, G, and 2D bands in the Raman spectrum of a deposit suggested boron doping in the MWCNTs. An apparent Young’s modulus of a grown MWCNT was measured to be 0.68TPa and comparable to those of heat-treated vapor grown carbon nanofibers. MWCNTs are thought to grow on molten boron carbide particles acting as seeds at high temperatures of up to ∼2400°C.