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首页> 外文期刊>Advanced Functional Materials >Electrically Tunable Surface Acoustic Wave Propagation at MHz Frequencies Based on Carbon Nanotube Thin-Film Transistors
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Electrically Tunable Surface Acoustic Wave Propagation at MHz Frequencies Based on Carbon Nanotube Thin-Film Transistors

机译：基于碳纳米管薄膜晶体管的MHz频率在MHz频率下电动表面声波传播

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摘要

Surface acoustic waves (SAWs) that propagate on the surface of a solid at MHz frequencies are widely used in sensing, communication, and acoustic tweezers. However, their properties are difficult to be tuned electrically, and current devices suffer from complicated configurations, complicated tuning mechanisms, or small ranges of tunability. Here a structure featuring a thin-film transistor configuration is proposed to achieve electrically tunable SAW propagation based on conductivity tuning. When a DC gate voltage is applied, the on-site conductivity of the piezoelectric substrate is modulated, which leads to velocity and amplitude tuning of SAWs. The use of carbon nanotubes and crystalline nanocellulose as the channel and gate materials results in high tuning capacity and low gate voltage requirement. The tunability is manifested by a 2.5% phase velocity tuning and near 10 dB on/off switching of the signals. The proposed device holds the potential for the next generation SAW-based devices.
机译：在MHz频率下在固体表面上传播的表面声波（锯）广泛用于感测，通信和声学镊子。然而，它们的性质难以被电动调谐，并且电流装置遭受复杂的配置，复杂的调谐机构或小的可调性范围。这里提出了一种具有薄膜晶体管配置的结构，以基于电导调谐来实现电调谐锯传播。当施加DC栅极电压时，压电基板的现场电导率被调制，这导致锯的速度和幅度调谐。用碳纳米管和结晶纳米纤维素作为通道和浇口材料导致高调能力和低栅极电压要求。可随局性由2.5％相速调谐和近10dB的信号接近/关闭信号。所提出的设备具有下一代基于锯的设备的潜力。

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