Solvent-free fabrication of a biodegradable all-carbon paper based field effect transistor for human motion detection through strain sensing

Abstract

(a) Schematic diagram of a fabrication method of a pencil on paper FET device; (b) image of flexible and wearable FET based strain sensors attached to the fore-finger for human motion detection; (c) strain sensing considering the resistance in stretched condition as the reference.

Flexible, Stretchable Sensors for Wearable Health Monitoring: Sensing Mechanisms, Materials, Fabrication Strategies and Features

“…Many efforts have been invested to detect the movement of hands and limbs, especially fingers. The simplest way to observing finger is adhering a strip to the target one, and the strip can be made of paper with pencil trace or organics membrane with carbon or metals [ 38 , 39 ] (as shown in Figure 2 a). However, the adhesion may bring uncomfortableness to the covered skin, and neatening the electrical wires will also become a chore if more strips are adhered.…”

“… Movement detection of fingers, wrist and knee: ( a )detection of finger movement by single strip; ( b ) detection of finger movement by glove-like device; ( c ) detection of knee and wrist movement. Reproduced from [ 38 ] with permission of The Royal Society of Chemistry. Reprinted with permission from [ 36 ].…”

Highly sensitive wearable sensor based on a flexible multi-layer graphene film antenna

“…Significantly, this FGF antenna sensor can be attached to human skin in the future for human motion detection. Different from some other sensors, this antenna sensor does not need communication equipment such as Bluetooth, ZigBee or WiFi for teletransmission information devices [35].…”

Drawing WS2 thermal sensors on paper substrates

“…3,9,10 This method, similar to writing or drawing with a pencil on paper, allows for the deposition of continuous films of material on the paper surface. Up to now this method have been extensively used to fabricate several sensors and electronic devices based on graphite 9,[11][12][13][14][15][16][17][18] and very recently it has been extended to other van der Waals materials like semiconducting transition metal dichalcogenides. 19,20 Here, we exploit the strong temperature dependence of the resistance of semiconducting WS 2 to fabricate thermal sensors on paper substrates.…”