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Strain-induced damage typically limits the bending radius of electronic circuits to a few millimetres. The development of very thin organic transistors and electronic circuit designs that show a bending radius down to 100 μm will enable novel applications with unconventional form factors.

Printable electronics is highly desirable for high throughput device manufacture. Here, Matsuhisa et al. report an electric ink, made of a self-assembled network of sliver flakes on the surface of a fluorine rubber matrix, which exhibits high conductivity and mechanical durability to achieve this goal.

Stretchable electronics enables applications on arbitrary curved surfaces or on movable parts to be made. Based on a new technique for printing with carbon nanotube pastes, stretchable active matrix displays containing integrated electronic circuits are now realized.

Ultrathin sheets of polymer LEDs that emit light even when being crumpled or stretched have been realized. The 2-μm-thick devices emit red or orange light with a sufficiently high brightness for indoor applications, and they could prove useful for integration with textiles.

Flexible electronics promise the opportunity to monitor biological activity via implanted devices. Here, the authors develop a biocompatible conductive carbon nanotube/gel composite and couple it with an ultrathin flexible amplifier, enabling in vivomeasurement of epicardial electrocardiogram signals.

Birds and many other animals can sense the Earth’s magnetic field, but not human beings. Here, Melzer et al. develop a type of artificial skin based on giant magnetoresistive sensor foils with micrometre thickness, which can be stretched up to >250% without sacrifices in device performance.

Organic solar cells are promising for technological applications, as they are lightweight and mechanically robust. This study presents flexible organic solar cells that are less than 2 μm thick, have very low specific weight and maintain their photovoltaic performance under repeated mechanical deformation.

An ultraflexible organic differential amplifier, which is only 2 μm thick and can conform to a person’s skin, can be used to record electrocardiograms with a signal-to-noise ratio of 34 dB.

Biocompatibility is a limiting factor in the use of electronic sensors in physiological applications. Here, the authors present a flexible and conductive polymer gel as an adhesive interface material for electronic biosensors, also demonstrating in vivoheart attachment and monitoring.

A functional bioadhesive has been developed to possess properties such as mechanical compliance, electrical conductivity and optical transparency, and is utilized for bonding electronic devices to various organs in the body for up to several months.

Next-generation energy autonomous biomedical devices must easily conform to human skin, provide accurate health monitoring and allow for scalable manufacturing. Here, the authors report ultraflexible ferroelectric transducers and organic diodes for biomedical sensing and energy harvesting.

Ultraflexible ferroelectric transducers based on P(VDF:TrFE) co-polymer with optimised crystalline structure by thermal annealing are utilised as sensors for vital parameters detection and as piezoelectric nanogenerators (PENG). The PENGs were incorporated in an energy harvesting system including OTFT-based rectifying circuits and thin film capacitors on a single ultrathin substrate. Both developments could pave the way towards self-powering, imperceptible e-health systems.

Organic electronic devices are promising for many applications, particularly in biomedical research, but are hindered by thermal instability and low melting points. Now, organic thin-film transistors are shown with excellent thermal properties that can withstand medical sterilization processes.

A composite fibrous material made of carbon nanotubes and graphene responds to small pressure but not to bending deformation.

Self-assembled few-layer organic films based on paraffinic tripodal triptycene provide an efficient surface functionalization strategy for high-performance organic electronic devices.

Electronic sensor foils only 2 μm thick are extremely light, 27-fold lighter than office paper, durable and flexible and conform to curvilinear surfaces for many innovative applications.