Xiao Lin, Chen Zhuo, Feng Chen, Liu Liang, Bai Zai-Qiao, Wang Yang, Qian Li, Zhang Yuying, Li Qunqing, Jiang Kaili, Fan Shoushan
Department of Physics & Tsinghua-Foxconn Nanotechnology Research Centre, Tsinghua University, Beijing 100084, People's Republic of China.
Nano Lett. 2008 Dec;8(12):4539-45. doi: 10.1021/nl802750z.
We found that very thin carbon nanotube films, once fed by sound frequency electric currents, could emit loud sounds. This phenomenon could be attributed to a thermoacoustic effect. The ultra small heat capacity per unit area of carbon nanotube thin films leads to a wide frequency response range and a high sound pressure level. On the basis of this finding, we made practical carbon nanotube thin film loudspeakers, which possess the merits of nanometer thickness and are transparent, flexible, stretchable, and magnet-free. Such a single-element thin film loudspeaker can be tailored into any shape and size, freestanding or on any insulating surfaces, which could open up new applications of and approaches to manufacturing loudspeakers and other acoustic devices.
我们发现，极薄的碳纳米管薄膜一旦被声频电流驱动，就能发出响亮的声音。这种现象可归因于热声效应。碳纳米管薄膜每单位面积的超小热容量导致了宽频率响应范围和高声压级。基于这一发现，我们制造出了实用的碳纳米管薄膜扬声器，其具有纳米厚度的优点，并且是透明、柔性、可拉伸且无磁的。这种单元素薄膜扬声器可以被制作成任何形状和尺寸，可独立存在或附着在任何绝缘表面上，这可能会开辟扬声器及其他声学设备制造的新应用和新方法。
