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[ Instrument R & D of Instrument Network ] Flexible pressure sensors have attracted widespread attention due to their potential applications in electronic skins. So far, there have been many methods reported to achieve effective conversion from mechanical stimulation to electrical signals. However, the problem of distorted signals in actual flexible matrix scenes has not been well resolved.
Concept and application example of artificial body reflex arc (Photo: SIAT)
Researchers from the Shenzhen Institute of Advanced Technology (SIAT) of the Chinese Academy of Sciences have proposed a flexible pressure sensor with high performance, zero standby power consumption, ultra-high sensitivity, and wide linear response range. The research was published in the journal Nano Energy ("High-Performance Zero-Standby Power Consumption for Artificial Reflected Arc Bending Pressure Sensors").
In the sensor structure, the researchers truncated pyramidal polydimethylsiloxane (PDMS) / aluminum-doped zinc oxide (AZO) and polyimide (PI) / gold (Au) interdigitated electrodes at the top ( PDMS-AZO / PS / PI Au) introduced a tunable photoresist spacer (PS).
The newly designed pressure sensor has the characteristics of zero standby power consumption when the bending angle is less than 20.5 °, while achieving an effective transition from the insulated state to the conductive state when the bending angle is greater than 20.5 °. In the ultra-wide linear response range of 62pa-9.6kpa, the sensitivity is 2200kpa-1, and the response and recovery time are fast (<20ms).
The research team further designed an artificial body reflex arc that simulates the response of the biological system. The sensor is installed on the volunteer's elbow. As the subject's bending angle increases, the signal is transmitted to the functional unit through the wireless Bluetooth module. The amount of LED lighting also increases accordingly.
These results show the great potential of the newly proposed sensor in smart wearable devices. This new sandwich structure plays a key role in achieving the advantages of bending insensitivity and zero standby power consumption, enhancing our ability to bend insensitive pressure sensors. understanding.