Remarkable influence of slack on the vibration of a single-walled carbon nanotube resonator.
Remarkable influence of slack on the vibration of a single-walled carbon nanotube resonator.
复制标题
DOI：
10.1039/c6nr00713a
复制
发表时间：
2016-04
期刊：
影响因子：
6.7
通讯作者：
Z. Ning;M. Fu;Gongtao Wu;Chenguang Qiu;J. Shu;Yao Guo;Xianlong Wei;Song Gao;Qing Chen
中科院分区：
文献类型：
--
作者：
Z. Ning;M. Fu;Gongtao Wu;Chenguang Qiu;J. Shu;Yao Guo;Xianlong Wei;Song Gao;Qing Chen
我们第一次定量研究实验上的显着影响松弛的单壁碳纳米管（SWCNT）谐振器的振动与可变的通道长度内原位制造的扫描电子显微镜，比较实验结果与理论预测计算从测量的几何和机械参数相同的SWCNT，并发现以下新的点。我们的实验表明，随着松弛s从约0增加到1.8%，检测到的振动从单模到多模振动的转换，和门调谐能力逐渐衰减的所有振动模式。当栅极电压V（g）dc较小时，纳米管谐振器工作在梁区时，二次调谐系数α随1/μ s线性减小。当V（g）dc具有中间值且纳米管谐振器工作在悬链线区域时，线性调谐系数γ以1/（4 μ S）线性减小。计算的α和γ与均匀面内模的实验值吻合得相当好。随着松弛的增加，谐振器的品质因数Q线性上升，但增加远不如以前的理论研究预测的那么陡峭。我们的研究结果对于理解和设计基于CNT和其他纳米材料的谐振器具有重要意义。
We for the first time quantitatively investigate experimentally the remarkable influence of slack on the vibration of a single-walled carbon nanotube (SWCNT) resonator with a changeable channel length fabricated in situ inside a scanning electron microscope, compare the experimental results with the theoretical predictions calculated from the measured geometric and mechanical parameters of the same SWCNT, and find the following novel points. We demonstrate experimentally that as the slack s is increased from about zero to 1.8%, the detected vibration transforms from single-mode to multimode vibration, and the gate-tuning ability gradually attenuates for all the vibration modes. The quadratic tuning coefficient α decreases linearly with 1/√s when the gate voltage V(g)dc is small and the nanotube resonator operates in the beam regime. The linear tuning coefficient γ decreases linearly with 1/ (4√S) when V(g)dc has an intermediate value and the nanotube resonator operates in the catenary regime. The calculated α and γ fit the experimental values of the even in-plane mode reasonably well. As the slack is increased, the quality factor Q of the resonator linearly goes up, but the increase is far less steep than that predicted by the previous theoretical study. Our results are important to understand and design resonators based on CNT and other nanomaterials.