Surface Potential Tuned Single Active Material Comprised Triboelectric Nanogenerator for a High Performance Voice Recognition Sensor

Abstract

To fabricate a high‐performance and ultrasensitive triboelectric nanogenerator (TENG), choice of a combination of different materials of triboelectric series is one of the prime challenging tasks. An effective way to fabricate a TENG with a single material (abbreviated as S‐TENG) is proposed, comprising electrospun nylon nanofibers. The surface potential of the nanofibers are tuned by changing the voltage polarity in the electrospinning setup, employed between the needle and collector. The difference in surface potential leads to a different work function that is the key to design S‐TENG with a single material only. Further, S‐TENG is demonstrated as an ultrahigh sensitive acoustic sensor with mechanoacoustic sensitivity of ≈27 500 mV Pa–1. Due to high sensitivity in the low‐to‐middle decibel (60–70 dB) sounds, S‐TENG is highly capable in recognizing different voice signals depending on the condition of the vocal cord. This effective voice recognition ability indicates that it has high potential to open an alternative pathway for medical professionals to detect several diseases such as neurological voice disorder, muscle tension dysphonia, vocal cord paralysis, and speech delay/disorder related to laryngeal complications.

Deep Learning Enabled Early Predicting Cardiovascular Status Using Highly Sensitive Piezoelectric Sensor of Solution‐Processable Nylon‐11

“…They are supposed to be superior for the fabrication of electronic devices in contrast to inorganic materials in view of their flexibility, stretchability, and biocompatibility features. [6][7][8][9][10][11][12] Piezoelectricity-based flexible sensors have numerous advantages over the existing technologies such as photoplethysmography (PPG) and electrocardiogram (ECG) as piezoelectricity-based sensors are self-powered, easy to fabricate, cost-effective, confirmable with the skin, and it provides direct measurements of the physiological events with greater sensitivity.Among the several piezoelectric polymers, odd-nylons (e.g., nylon-11) are treated as one of the best suitable materials for Cardiovascular diseases are found as one of the major cause of deaths globally, these can be reduced substantially if early-stage detection and intervention is possible. Regular monitoring of the arterial pulse is one of the possible solutions, however, existing technologies have put limitations, due instability in continuous monitoring, lack of information in real-time recording of cardiovascular parameters and bulky instruments.…”

“…They are supposed to be superior for the fabrication of electronic devices in contrast to inorganic materials in view of their flexibility, stretchability, and biocompatibility features. [6][7][8][9][10][11][12] Piezoelectricity-based flexible sensors have numerous advantages over the existing technologies such as photoplethysmography (PPG) and electrocardiogram (ECG) as piezoelectricity-based sensors are self-powered, easy to fabricate, cost-effective, confirmable with the skin, and it provides direct measurements of the physiological events with greater sensitivity.…”

Rational Design of Advanced Triboelectric Materials for Energy Harvesting and Emerging Applications

“…Currently, the effects of the electrical polarity applied to the nozzle were researched. [263,282] The alternating polarity between the positive and the negative electrodes contributes to changes in the surface chemistry of materials, which not only fills a gap in the research on electrospinning technology, but also proposes a new approach for the design of electrospun triboelectric materials.…”

A Piezoelectric MEMS Speaker with a Combined Function of a Silent Alarm

“…Over recent years, there has been much research interest in audio electronics, such as micro speakers [ 1 , 2 ], hearing aids [ 3 , 4 ], and speech recognition sensors [ 5 , 6 , 7 ]. These single-function devices have greatly improved people’s quality of life, but they are still far from meeting the ever-increasing demands for convenience.…”