SMALL cover: Overview of two-dimensional material-based wearable electronic devices

   In recent years, the gratifying progress made in material production, device manufacturing and flexible electronics has brought huge prosperity to wearable electronic products for people‘s medical monitoring and medical diagnosis. In particular, the emergence of two-dimensional materials has been widely used in these potential fields due to its light weight, good tensile properties, excellent biocompatibility and high performance. Therefore, the research and development of two-dimensional material-based wearable electronic devices for the detection of various human signals is imminent.

Achievements

     Recently, Tsinghua University ‘s Ren Tian Ling Jiaoshou in top international journals Small published entitled " Wearable Electronics Based ON 2D Materials for Human Physiological Information Detection " paper. The graphene-based materials, transition metal double-halide-based materials and transition metal carbonitride-based materials used in wearable electronic devices were discussed. Human physiological information is divided into two categories, namely human physical and chemical signals. Body temperature monitoring, electrocardiogram, and subtle signals to limb movements are physical signals, and body fluids, breathing gas, and saliva are detected as chemical signals. The typical examples of these specific applications in the review highlight the progress and development direction in recent years. Briefly prospected the development prospects of commercialization of wearable medical technology.

Figure  1  Two-dimensional material-based wearable electronic device.

Figure  2  is a typical two-dimensional material crystal form for wearable electronic devices.

Figure  3  Flexible rGO -based transparent transistor.

Figure  4  Graphene-based electrode array structure diagram .

 Table  1  Key parameters of the two-dimensional material mechanics sensor.

Figure  5  is a face-to-face interlocking rGO pressure sensor inspired by human skin epidermis .

Fig.  6 is  a strain sensor based on a polyurethane core fiber coated with polyester fiber rGO .

Figure  7  fish scale strain sensor.

Figure  8  working principle of piezoresistive sensor.

Figure  9 The working mechanism of graphene transistors.

Figure  10 Schematic diagram of a graphene-based pressure sensor with a double-sided god structure .

Fig.  11 is a schematic diagram of a flexible electronic skin with a pressure sensor and a temperature sensor.

FIG.  12 is a schematic diagram of an ion sensor array based on self-assembled graphene. .

Figure  13  Flexible biosensor for respiratory humidity monitoring.

Figure  14  Schematic diagram of a graphene / silk-based wireless biosensor for enamel bacteria detection .

in conclusion

      Although human physiological signals have been detected in many jobs, there is still a long way to go from the laboratory to commercial products. First of all, the use of flexible circuit boards, small size, light weight, low power consumption signal processing unit needs to work closely with electronic engineering to promote. The second is that the development of large-scale manufacturing technology is essential to reduce costs. Finally, wearable detection devices for various human signals should be evaluated by experts in the corresponding medical institutions.

Original link:

https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202070083

Source: MXene Academic