A novel, high-fidelity (hi-fi) thermophone based on three-dimensional porous CNT sponge is designed for attachable and wearable sound generation devices. In addition to its simple structure and easy fabrication, CNT sponge thermophone exhibits excellent thermoacoustic and mechanical characteristics, particularly its wideband frequency response, due to its highly efficient energy conversion capability through the CNT nano-structural materials. In this paper, the hi-fi sound response of suspended CNT sponge thermophones is analyzed by theory and experiment. A theoretical thermoacoustic model for CNT sponge thermophone is proposed and the corresponding analytical solutions are established. To explore applications of CNT sponges, a flexible thermophone and a hi-fi thermoacoustic loudspeaker are developed and investigated by experiment. The flexible CNT sponge thermophone presents stable sound response before and after it is attached to some complicated surfaces. The CNT sponge thermoacoustic loudspeaker shows a wide bandwidth, high-quality audio output, and stable sound response. Such premium characteristics ensure its feasibility as a potential replacement for the conventional voice coil and piezoelectric loudspeakers.

一种基于三维多孔碳纳米管海绵的新型高保真 ( hi-fi ) 热听器专为可连接和可穿戴的发声设备而设计。碳纳米管海绵热听器除了结构简单、易于制造外，还表现出优异的热声和机械特性，特别是其宽带频率响应，这是由于其通过碳纳米管纳米结构材料的高效能量转换能力。本文从理论和实验的角度对悬置式碳纳米管海绵热听器的高保真声音响应进行了分析。提出了碳纳米管海绵热听器的理论热声模型，并建立了相应的解析解。探索碳纳米管海绵、柔性热听器和高保真音响的应用热声扬声器的开发和实验研究。柔性碳纳米管海绵热听器在附着在一些复杂的表面之前和之后都表现出稳定的声音响应。CNT海绵热声扬声器具有宽带宽、高品质音频输出和稳定的声音响应。这种卓越的特性确保了其作为传统音圈和压电扬声器的潜在替代品的可行性。