Bio-Cellulose Substrate for Fabricating Fully Biodegradable Resistive Random Access Devices

Abstract

Organic resistive random access memory (RRAM) has high potential in the nonvolatile memory field for next-generation green electronics. In general, RRAM devices are usually fabricated on substrates, for example, glass and plastic. In the present study, an Al/gelatin/Ag sandwiched structure on a bio-cellulose (BC) film is demonstrated, whose texture is flexible, ductile, and can be adapted to uneven surfaces. The BC film could be degraded completely in soil in only 5 days. In addition, the gelatin dielectric layer and the BC film substrate are non-toxic and environmentally friendly, realizing a skin-inspired and fully biodegradable device. This Al/gelatin/Ag/BC device shows a high on/off current ratio (>104), low operation voltage (<3 V), and good uniformity at room temperature without obviously aging by which it can still retain its ability. Moreover, this device also withstands the simulation of the effects on temperature and perspiration of human skin, investigated by measuring the electrical characteristics after attaching it onto pigskin. The results show that the device can be operated repeatedly, and the high on/off current ratio (close to 104) is still retained. The outstanding performances prove its feasibility as a skin-attachable wearable device. The demonstration implies that the skin-inspired biodegradable device is a forward-looking development and can be applied to the physiological evaluation and daily recording of wearable devices.

Applications of biomemristors in next generation wearable electronics

“…In 2021, Chang et al prepared a flexible biomemristor by using biocellulose as the substrate and gelatin as the active layer, whose ductility made it adapt to different concave convex faces. 119 This flexible characteristic made the biomemristor device have potential application in the field of wearable electronics. The biomemristor with a Al/gelatin/Ag/biocellulose structure shows a high HRS/LRS ratio (410 4 ) and low operating voltage (o3 V), and the cross-sectional image of the biomemristor is shown in Fig.…”

“…(m-p) The degraded process photographs of the biomemristor. Panels (a-p) reproduced with permission 119. Copyright 2021, American Chemical Society.…”

Degradable Carrageenan as a Substrate and Resistive Material for Flexible Applications

“…Resistance random access memory (RRAM) has attracted a great deal of attention in recent years due to its nonvolatility, high-speed performance, high-density, fast response time, low power consumption, and simple structure . Owing to the advantages of structural flexibility and low-temperature solution process-ability biomaterials, resistive layers have been recognized as an emerging candidate for next-generation nonvolatile memory applications. , On the other hand, because more and more wearable and biointegrated medical devices are being developed to improve the convenience and security of our lives, biodegradable flexible memory devices are rapidly rising all over the world. , The stability of each layer comprising the flexible resistive memory device determines the performance of a biodegradable flexible memory device under structurally bent conditions. Furthermore, their bending performance also depends on the mechanical properties of biodegradable substrates.…”

Physically Transient, Flexible, and Resistive Random Access Memory Based on Silver Ions and Egg Albumen Composites

“…It can be seen that biomaterials have the potential to prepare novel physically transient devices, which can partially or completely disappear physically when the physically transient devices are stimulated externally. This new type of physically transient device can meet the needs of future transient information storage devices [ 32 ].…”