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A parallel double helix wire‐shaped supercapacitor protocol has been developed by H. Li, T. Zhai and co‐workers, presented on page 1024. Two symmetric titanium@MnO2 fiber electrodes are wound on a flexible nylon fiber by a simple and reliable process. Due to rational structure design, the devices demonstrate excellent mechanical and electrochemical stability under both static and dynamic deformations...
Wire‐shaped flexible supercapacitors (SCs) have aroused much attention due to their small size, light weight, high flexibility, and deformability. However, the previously reported wire‐shaped SCs usually involve complex assembly processes, encounter potential structural instabilities, and the influence of dynamic bending on the electrochemical stability of wire‐shaped SCs is also not clear. Here,...
Managing the mechanical mismatch between hard semiconductor components and soft biological tissues represents a key challenge in the development of advanced forms of wearable electronic devices. An ultralow modulus material or a liquid that surrounds the electronics and resides in a thin elastomeric shell provides a strain‐isolation effect that enhances not only the wearability but also the range...
Wearable health monitoring by flexible sensing electronics will bring a revolution for diagnostic methods towards portable, wearable, remote, and timely devices. In article number 1602790, Xuewen Wang, Zheng Liu, and Ting Zhang, comprehensively review the recent progress in nanomaterial‐based flexible sensing electronics from materials to device configurations to healthcare applications.
Wearable or attachable health monitoring smart systems are considered to be the next generation of personal portable devices for remote medicine practices. Smart flexible sensing electronics are components crucial in endowing health monitoring systems with the capability of real‐time tracking of physiological signals. These signals are closely associated with body conditions, such as heart rate, wrist...
Moore's law predicts the performance of integrated circuit doubles every two years, lasting for more than five decades. However, the improvements of the performance of energy density in batteries lag far behind that. In addition, the poor flexibility, insufficient‐energy density, and complexity of incorporation into wearable electronics remain considerable challenges for current battery technology...
Flexible transparent conductors are an enabling component for large‐area flexible displays, wearable electronics, and implantable medical sensors that can wrap around and move with the body. However, conventional conductive materials decay quickly under tensile strain, posing a significant hurdle for functional flexible devices. Here, we show that high electrical conductivity, mechanical stretchability,...
Carbon nanotube metals in a polydimethylsiloxane composite exhibit distinct electromechanical responses under high tensile strain. In article number 1802625, YuHuang Wang and co‐workers demonstrate that long nanotubes efficiently bridge strain‐induced cracks in the composite, maintaining high conductivity even after 1000 stretch‐release cycles, while short nanotubes respond sensitively to shape changes,...
This work describes a flexible and stretchable battery pack configuration that exhibits highly stable performance under large deformation up to 100% biaxial stretching. Using stress‐enduring printable inks and serpentine interconnects, the new screen‐printing route offers an attractive solution for converting rigid battery units into a flexible, stretchable energy storage device. Coin‐cell lithium...
The popularization of personalized wearable devices has accelerated the development of flexible/stretchable supercapacitors (SCs) that possess remarkable features of miniaturization, high security, and easy integration to build an all‐in‐one integrated system, and realize the functions of comfortable, noninvasive and continuous health monitoring, motion records, and information acquisition, etc. This...
Supercapacitors (SCs) have shown great potential for mobile energy storage technology owing to their long‐term durability, electrochemical stability, structural simplicity, as well as exceptional power density without much compromise in the energy density and cycle life parameters. As a result, stretchable SC devices have been incorporated in a variety of emerging electronics applications ranging...
Living systems can respond to external stimuli by dynamic interface changes. Moreover, natural wrinkle structures allow the surface to switch dynamically and reversibly from flat to rough in response to specific stimuli. Artificial wrinkle structures have been developed for applications such as optical devices, mechanical sensors, and microfluidic devices. However, chemical molecule‐triggered flexible...
In article number 1900216, Ting Zhang and co‐workers propose a dual‐signal responsive flexible volatile organic compound sensor based on surface wrinkles with both dynamic visual feedback and a quantitative electrical signal. Tunable sensitivity and selectivity are well‐controlled, and the high selectivity toward ethanol vapor is explained by a proximity mechanism. This platform can provide a novel...
The dawn of the age of wearable electronics: buckling structures, which are widely used in nature, provide the required deformability of wearable electronic devices. In article number 1804805, Zunfeng Liu and co‐workers provide fundamental insights into recent advances of fabrication of buckling structures and their applications in wearable electronics. Challenges and future perspectives for buckled...
Wearable electronics have attracted a tremendous amount of attention due to their many potential applications, such as personalized health monitoring, motion detection, and smart clothing, where electronic devices must conformably form contacts with curvilinear surfaces and undergo large deformations. Structural design and material selection have been the key factors for the development of wearable...
Wearable devices are mainly based on plastic substrates, such as polyethylene terephthalate and polyethylene naphthalate, which causes environmental pollution after use due to the long decomposition periods. This work reports on the fabrication of a biodegradable and biocompatible transparent conductive electrode derived from bamboo for flexible perovskite solar cells. The conductive bioelectrode...
High‐performance supercapacitors (SCs) are important energy storage components for emerging wearable electronics. Rendering low‐temperature foldability to SCs is critically important when wearable devices are used in a cold environment. However, currently reported foldable SCs do not have a stable electrochemical performance at subzero temperatures, while those that are performing are not foldable...
Motivated by the increasing demand of wearable and soft electronics, liquid metal (LM)‐based microfluidics has been subjected to tremendous development in the past decade, especially in electronics, robotics, and related fields, due to the unique advantages of LMs that combines the conductivity and deformability all‐in‐one. LMs can be integrated as the core component into microfluidic systems in the...
In article number 1901124, Tian‐Ling Ren and co‐workers comprehensively review wearable electronics based on two‐dimensional materials including graphene, transition‐metal dichalcogenides (TMDs), and transition metal carbides or carbonitrides (MXenes). Due to their extraordinary physiochemical properties, they have displayed promising applications in various physiological information detection.
Recently, advancement in materials production, device fabrication, and flexible circuit has led to the huge prosperity of wearable electronics for human healthcare monitoring and medical diagnosis. Particularly, with the emergence of 2D materials many merits including light weight, high stretchability, excellent biocompatibility, and high performance are used for those potential applications. Thus,...
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