Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 29 (Xinhua) according to data from the World Health Organization, about 430 million people worldwide suffer from hearing loss due to cochlear damage, which is mainly improved by cochlear implants. However, the speech recognition ability of traditional cochlear implant is low, and the mismatch between rigid electrode and soft tissue may lead to nerve injury and tinnitus. With the development of the Internet of things and artificial intelligence, the research of flexible self-powered cochlear implant has attracted wide attention.

According to the release of the Chinese Academy of Sciences, the Song Yanlin Research Group of the Institute of Chemistry of the Chinese Academy of Sciences has recently made a series of progress in the synthesis of anisotropic materials and the preparation of patterned devices, such as two-dimensional MXene and nanocrystalline composites (J. Mater. Chem. A, 2022, 10, 14674-14691 X Nano Res. 2022, DOI:10.1007 / s 12274-022-4667 SIREX), direct writing of high performance atomic thick two-dimensional semiconductor thin films and devices (Adv. Mater. 2022, DOI:10.1002 / adma.202207392), humidity sensing supercapacitors based on alternating stack microelectrodes (Energy Environ. Mater. 2022, DOI:10.1002 / eem2.12546).

Piezoelectric materials can be used as favorable candidates for cochlear implants in the future. however, the mainstream lead-containing piezoelectric materials are incompatible with biology and are not environmentally friendly, and the electrical output power of other piezoelectric materials is low due to their low acoustoelectric conversion performance. not enough to directly stimulate the auditory nerve. Therefore, it is of great significance to manufacture high-performance lead-free flexible piezoelectric acoustic sensors. Recently, inspired by human cochlear outer ear hair cells, the team reported a direct writing microcone array strategy of multi-component lead-free perovskite rods based on quasi-homomorphic phase boundaries. On the one hand, the orientation engineering and the quasi-homomorphic phase boundary formed between two different orthogonal phases (Amm2 and Pmmm) are used to significantly improve the effect of stress on the properties of piezoelectric materials and enhance the piezoelectric response; on the other hand, a microcone array is introduced into the surface of the piezoelectric film to increase the contact area with sound waves and enhance the absorption of sound waves, thus preparing a high-performance flexible piezoelectric acoustic sensor (FPAS).

CTOnews.com learned that the sensor shows the characteristics of high sensitivity and wide frequency response, covers commonly used speech frequencies, and has angle sensitivity, which can be used to record sound signals, and to achieve speech recognition and human-computer interaction. FPAS also has the characteristics of waterproof and acid-alkali resistance to meet the requirements of the natural environment for wearable acoustic sensors. The relevant research results were recently published on Matter.

Fig. 1 demonstration diagram of the application of micro-cone array flexible piezoelectric acoustic sensor

Fig. 2 Sound data acquisition, human-computer interaction application and waterproof performance of FPAS

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