Flexible Magnetoreceptors: Flexible Magnetoreceptor with Tunable Intrinsic Logic for On‐Skin Touchless Human‐Machine Interfaces (Adv. Funct. Mater. 25/2021)

A Flexible Self-Powered Noncontact Sensor with an Ultrawide Sensing Range for Human–Machine Interactions in Harsh Environments

“…At a distance of 2.5 m, the voltage outputs range from approximately 0.15 to 0.25 V, and the background electrical noise is just 0.05 V. When using our ENS to monitor walking motions in 2.5 m, the signal-to-noise ratio (SNR) ranges from ∼9.5 to ∼14. The sensing range of 2.5 m surpasses most of the reported values of current field-based electronics. ,,,,,,,, Moreover, our 5-layer ENS with a size of 5 × 5 cm 2 can distinguish typical motions like walking, falling, and jumping at a distance of 2 m away. Each motion produces distinct and recognizable patterns in the corresponding outputs of the ENS (Figure b and Video S4).…”

“…The multilayer ENS exhibits excellent flexibility and transparency, improving its adaptability as an interactive interface, as shown in Figure c. More importantly, to highlight the sensing performance of our ENS, the maximum sensing range of the ENS and the relative humidity (RH) range in which the ENS can work stably are compared with those values reported in current works, ,,− ,,,,− as shown in Figure d and Table S1. Our ENS demonstrates a maximum sensing range exceeding 2.5 m and a humidity range of up to 100% RH, which are superior to previous works.…”

“…To overcome these challenges and facilitate seamless interactions between humans and machines, researchers have explored noncontact field-based electronics that can work effectively through changes in the spatiotemporal varying electric or magnetic field between the sensor and the sensing object. 9 These noncontact electronics are usually based on electromagnetic techniques, 4,10,11 capacitance or resistance changes, 12−20 tion, 21−31 etc. They can theoretically detect any movements that disturb their fields and are highly determined by these fields, but most of them are effective within a few centimeters.…”

“…To overcome these challenges and facilitate seamless interactions between humans and machines, researchers have explored noncontact field-based electronics that can work effectively through changes in the spatiotemporal varying electric or magnetic field between the sensor and the sensing object . These noncontact electronics are usually based on electromagnetic techniques, ,, capacitance or resistance changes, − electrostatic induction, − etc. They can theoretically detect any movements that disturb their fields and are highly determined by these fields, but most of them are effective within a few centimeters. ,,,, To break through this limitation, approaches such as enhancing inherent electric fields by improving the electron storage of the active layer or amplifying magnetic fields by filling rich percolation networks of magnetic fillers have been proposed. , However, these methods face challenges posed by environmental interference, particularly under high humidity conditions.…”