Weak Molecular Interactions in Organic Composite Dry Film Lead to Degradable, Robust Wireless Electrophysiological Signal Sensing (Adv. Mater. Interfaces 24/2022)

Abstract

Conductive Dry Electrode for Electrophysiological Signal Detection In article number 2200594, Young‐Joon Kim, Hocheon Yoo, and co‐workers demonstrate that a biodegradable polymeric composite electrode allows long‐term and sensitive electrophysiological biosignal sensing. The robust mechano‐electrical properties of the dry organic film are achieved through the weak‐molecular interaction between the PEDOT:PSS, HEC, and dopamine. Consequently, the epidermal electrodes successively detect the ECG and EMG signals using a wireless measurement system.

Bioelectronic Applications of Intrinsically Conductive Polymers

“…Although the wet electrodes can have good compliance with the skin, they are not suitable for long‐term biopotential monitoring because of the skin irritation they cause and dehydration over time. [ 49 ] Instead, dry electrodes with compliant contact to skin can be used for long‐term monitoring. [ 50–52 ] There are mainly three types of dry electrodes, that is, flexible patch electrodes, [ 53 ] textile electrodes, [ 54 ] and thin film e‐tattoo electrodes.…”

“…also reported self‐adhesive dry electrodes consisting of PEDOT:PSS, polydopamine, and hydroxyethyl cellulose (Figure 3d). [ 49 ] In addition, good permeability is also required for long‐term use. Zhang et al.…”

A moldable PEDOT:PSS dry electrode with excellent epidermal compliance for wearable electrocardiogram monitoring

“…3 Silver/silver chloride (Ag/AgCl) gel electrodes are dominant in clinical practice, but they are prone to signal attenuation during prolonged monitoring induced by the evaporation of liquid in the gel electrolyte, as well as skin irritation. 4 Therefore, extensive efforts have been devoted to the development of skin-friendly dry electrodes for long-term wearable ECG measurements. Dry electrodes in the literature can be mainly divided into contact dry electrodes and non-contact dry capacitive electrodes.…”

“…11 Recently, porous dry electrodes have been reported intensively because of their good softness and gas permeability. In such porous electrodes, conductive materials like thin metal films, 12,13 conductive nanomaterials, 14 and intrinsically conductive polymers 4 are mostly decorated on the surface of a porous structure or incorporated into porous polymer composites. The surface conductive coating on the porous structure is fragile and easily gets delaminated from the substrate, leading to signal degradation over time.…”

Overcoming Downscaling Limitations in Organic Semiconductors: Strategies and Progress

“…OFETs possess unique advantageous characteristics, including mechanical flexibility, [17,18] compatibility with various form factors, [19] accessibility to chemical synthesis, [20] mass scalability in the fabrication process (such as printable electronics), [21] and cost competitiveness. [22] Over the past few decades, much effort has been put in to realize electronic devices with unprecedented features, such as wearable sensors, [23,24] disposable electronics, [25,26] and foldable and even stretchable displays, [27] by harnessing these desirable qualities of organic semiconductors (OSCs). These groundbreaking achievements highlight that while the down-scalability of organic electronic device products is an important factor to consider, it cannot be the sole determining factor in this field.…”