A general strategy for high performance nonvolatile polymer memory devices, with wrinkled reduced graphene oxide (rGO) films as electrodes and common insulating polymers as active layers, is proposed. The fabricated device exhibits electrical bistability and nonvolatile write‐once‐read‐many times‐type memory, with a low switching voltage of 2.7 V, high ON/OFF ratio of 104 and desirable long retention time over 104 s. The resistive switching of the device might be attributed to carbon‐rich filaments induced by the wrinkled rGO surface. Moreover, this polymer memory device based on a wrinkled rGO electrode can be further applied to flexible data storage systems. The strategy combining such advances in polymer memory devices with simple structure, common materials, excellent reproducibility, and high performance will demonstrate great potential in permanent archival storage applications.

Dissolvable and flexible light emitting fibers toward multicolor lighting are fabricated via an all-solution processing method.

Bioskins possess a great ability to detect and deliver external mechanical or temperature stimuli into identifiable signals such as color changes. However, the integration of visualization with simultaneous detection of multiple complex external stimuli in a single biosensor device remains a challenge. Here we propose an allsolution-processed bioinspired stretchable electronic skin with interactive color changes and four-mode sensing properties. The fabricated biosensor demonstrates sensitive responses to various stimuli including pressure, strain, voltage, and temperature. Sensing visualization is realized by color changes of the e-skin from brown to green and finally bright yellow as a response to intensified external stimuli, suggesting great application potential in military defense, healthcare monitoring, and smart bionic skin.

interpret the sensory information brought by irritating gas (e.g. liquefied petroleum gas, volatile organic compounds (VOCs), rancid smell). This sensory information is transmitted to brain via olfactory sensory nerves, which is followed by storage and interpretation of the smell information in brain via memory cells. [6][7][8][9][10][11][12][13] Such a process can provide awareness surrounding environment and major guide for our decision making and taking actions (Figure 1). [6,12] Volatile organic compounds (VOCs), are commonly present in industrial production, home decoration, paint materials, automobile exhaust, and so on. [14][15][16][17][18][19] Some VOCs are highly carcinogenic or toxic, which are detrimental to human health, such as headache, nausea, dizziness, coughing, and even death. [18][19][20][21] As part of risk assessment to prevent these health threats, developing artificial olfactory memory electronics, which aim at establishing bioinspired electronics to highly simulate biological recognition, learning, and memorization, is of great interest in several fields, like environmental monitoring, health care, food industry, and explosives detection. [22][23][24][25][26][27][28][29] In order to mimic biological olfactory system, several strategies have been demonstrated to construct artificial olfactory electronics. The prevailing strategy is to construct arrays of devices with multiple sensors, such as chemical sensor, color sensor, and optoelectronic Schottky sensor. [30][31][32][33][34][35][36] For instance, Dodd and Persaud introduced a gas sensors array with three metal oxide gas sensors to mimic the smell discrimination ability of mammalian olfactory system. [30] Another approach is integrating chemical color sensors array with intelligent analysis networks to achieve olfactory system. [37][38][39][40] Recently, Chen and co-workers designed a bioinspired artificial scent screening system to monitor meat freshness, which was based on combining colorimetric barcode combinatorics with deep convolutional neural networks. [37] All these findings have focused on the development of artificial olfactory systems by gas sensing and establishing complicated neural networks; however, the memory part of the complete process of biological recognition, learning, and memorization is still missing due to the lack of memory units.Here, we propose an artificial olfactory memory system for mimicking human olfactory memory by integrating highly selective gas sensor with resistive switching memory (Figure 1). A gas sensor system was developed to mimic smell sensing function of the electronic nose via depositing ceramic In biology, the sensory memory system plays a critical role by providing awareness and guidance for human action/decision. Olfactory memory, which is based on odor detection by receptor cells within the nasal cavity and followed by rapid decision making in the brain, is one of the most important, but least studied, sensory memory systems. Mimicking the olfactory memory by developing recognition, learni...