首页> 外文会议>ASME international mechanical engineering congress and exposition >ATOMIC SCALE INVESTIGATION OF NANOPARTICLE AND FABRICATION TEMPERATURE EFFECTS ON CARBON NANOTUBE DIAMETER AND CHIRALITY
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ATOMIC SCALE INVESTIGATION OF NANOPARTICLE AND FABRICATION TEMPERATURE EFFECTS ON CARBON NANOTUBE DIAMETER AND CHIRALITY

机译:纳米粒子和制造温度施加对碳纳米管直径和手性的原子规模研究

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Carbon nanotubes (CNTs) are one of the best candidates for utilizing in the future nanoelectronic devices. However, the semiconductivity property of CNTs varies as diameter and chirality number change. Several nanoelectronic applications require semiconductivity to be of a certain value with little variability. Therefore, it is necessary to reliably produce uniform CNTs with unique diameter and chirality. However, this still remains one of the challenging problems in the large scale production and application of CNTs. In this paper, the effect of fabrication temperature change on CNTs diameter and chirality are experimentally and theoretically studied. Utilizing chemical vapor deposition (CVD) fabrication process and by conducting experimental investigation, it is observed that a CNT possesses a larger diameter at its base compared to the section far away from deposited nanoparticles. Moreover, using MD simulation technique, it is observed that the energy of the CNTs molecular structure will increase by applying higher fabrication temperature. Usually this energy increase is greater in the thicker CNTs. However, the energy increase percentage is found to be affected by the chirality of the CNT. Among CNTs of the same diameter, the armchair conformation has the highest percent increase, followed by the chiral CNTs, and the zigzag nanotube has the lower percent increase. The obtained results can be utilized in a controllable CNTs diameter and chirality design process.
机译:碳纳米管(CNT)是利用未来纳米电子器件的最佳候选者之一。然而,CNT的半导体性能随着直径和手性数变化而变化。几种纳米电子应用需要半导体具有一定的可变性的值。因此,必须可靠地产生具有独特直径和手性的均匀CNT。然而,这仍然仍然是CNTS大规模生产和应用中的具有挑战性问题之一。在本文中,实验和理论地研究了制造温度变化对CNT直径和手性的影响。利用化学气相沉积(CVD)制造工艺并通过进行实验研究,观察到与远离沉积的纳米颗粒的截面相比,CNT在其基部具有较大直径。此外,使用MD仿真技术,观察到通过施加更高的制造温度来增加CNT分子结构的能量。通常,这种能量增加在较厚的CNT中更大。然而,发现能量增加百分比受CNT的手性影响。在相同直径的CNT中,扶手椅构象具有最高百分比的增加,其次是手性CNT,Z字形纳米管的增加百分比较低。所得结果可用于可控的CNT直径和手性设计过程。

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