I. Overview of the article Flexible, breathable and degradable pressure sensors have attracted great attention in various practical applications such as wearable artificial skin, medical monitoring and artificial intelligence because of their excellent sensing performance, flexibility, breathability, portability, reduction of electronic waste and environmental friendliness. However, traditional plastics or elastomers have impermeability, discomfort, mechanical mismatch and non-degradability, which greatly limit their practical application. Therefore, it is still a key challenge and a great need to manufacture such a pressure sensor with high flexibility, degradability and air permeability. Recently, a wearable, breathable, degradable and highly sensitive pressure sensor based on MXene/ protein nanocomposites was proposed by the research team of Professor Liqun Zhang and Pengbo Wan from beijing university of chemical technology. Considering biodegradability and breathability, the sensor is expected to find potential applications in intelligent electronic skin, human motion detection, disease diagnosis and human-computer interaction. The related research paper is entitled "breathable ti3c2txmxene/protein nanocomposites for ultra sensitive medical pressure sensor with degradability in solvents" and published in ACS Nano (IF=14.588), the top international journal of materials science.

(1) preparation of materials and devices: the manufactured MXene/ protein-based pressure sensor is assembled by breathable conductive MXene coated silk fibroin nanofiber (MXene-SF) membrane and silk fibroin nanofiber membrane with MXene ink-SF cross electrode pattern, which can be used as sensing layer and electrode layer respectively.

(2) Sensor performance: The assembled pressure sensor has wide sensing range (up to 39.3 kPa) and high sensitivity (298.4 kPa-1 at 1.4-15.7 kPa); 171.9 kPa-1 at 15.7-39.3 kPa), fast response/recovery time (7/16 ms), reliable air permeability, excellent cycle stability over 10,000 cycles, good biocompatibility and strong degradability.

(3) Application scenario: The sensor can monitor human physiological signals, be used as artificial skin to quantitatively monitor pressure distribution, and show excellent sensing performance in real-time and wireless biological monitoring.

Second, the graphic guide

Fig. 1. Schematic diagram of manufacturing process of breathable degradable MXene/ protein nanocomposite pressure sensor.

Fig. 2. (a) SEM image of SF nanofiber membrane. (b) SEM images of b)MXene nanosheets. (c) AFM images of c)MXene nanosheets. (d) SEM image of d)MXene-SF film. (e) photos of MXene ink -SF interdigital electrode attached to fingers. (f) Photo of SF nanofiber film with f)MXene ink pattern used as conductor to light LED bulb. (g) conductivity retention rate of serpentine electrode patterned by MXene ink after different bending/extension cycles. (h) schematic diagram of water vapor transmission test and (i) mass change of remaining water in the bottle.

Figure 3. Sensing performance of pressure sensor.

Fig. 4. the application of mxene/protein pressure sensor in the detection of large-scale human activities and small activities.

Fig. 5. pressure mapping and wireless sensing performance of mxene/protein-based pressure sensing array.

Fig. 6. biocompatibility and degradation characteristics of mxene/protein nanocomposite sensor.

Third, the paper information Breathable Ti3C2Tx MXene/Protein Nanocomposites for Ultrasensitive Medical Pressure Sensor with Degradability in Solvents ACS Nano (IF=14.588) Pub Date : 2021-06-03 DOI: 10.1021/acsnano.1c00472 Mingyuan Chao, Lingzhang He, Min Gong, Na Li, Xiaobin Li, Longfei Peng, Feng Shi, Liqun Zhang, Pengbo Wan Interdisciplinary Research Center for Artificial Intelligence, College of Materials Science and Engineering, State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

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