Silver‐Nanoparticle‐Modified Polyimide for Multiple Artificial Skin‐Sensing Applications

Abstract

Wearable devices have become very important for collecting health information and monitoring the condition of seriously ill patients. However, most recently developed wearable devices can only monitor limited signals within a very small range of values. A novel sensor is fabricated by modifying the surface of polyimide nanowires with silver nanoparticles. These nanowire sensors can sense both pressure and temperature changes and have antimicrobial properties. The fabricated sensor can detect a wide range of pressure variation from 5 KPa to 100 KPa. A theoretical model is developed to explain the sensing mechanism of the silver‐nanoparticle‐modified polyimide nanowires. The experimental and theoretical results for the nanowires are in good agreement. By attaching these sensors to human joints and fingers, real‐time information can be detected for human motion, such as walking or holding a hot cup of water. The excellent performance of this device shows that it has great potential for use in artificial skins for detecting temperature and human motion.

Highly Stretchable, Elastic, and Sensitive MXene-Based Hydrogel for Flexible Strain and Pressure Sensors

“…The limit of detection of the pressure sensor is measured to be 0.87 Pa. Compared with literatures [36,39,[41][42][43][44][45][46], the MDN hydrogel pressure sensor demonstrates extraordinary sensing performances in terms of response time and detection limitation (Figure 4(f)). Figure 4(g) shows the durability of the MDN hydrogel pressure sensor at a cyclic pressure loading of 0-4 kPa.…”

“…The highly crosslinked MXene conductive dual network also endows the pressure sensor with extremely short response time (33.5 ms) and recovery time (52 ms) for a stress stimulus of 800 Pa (Figure 4(d)), which exceeded many reported hydrogel-based pressure sensors [41][42][43]. As shown in Figure 4(e), when a piece of paper (0.1462 g) with an area of 14 × 12 mm 2 is loaded onto the surface of the pressure sensor, the relative current variation increases by one step and stabilizes thereafter, indicating a susceptive response to subtle pressure.…”

Adhesive, Stretchable, and Transparent Organohydrogels for Antifreezing, Antidrying, and Sensitive Ionic Skins

“…In recent years, the application of wearable electronic devices has received extensive attention, such as the detection of human life signals, , sensors, , electronic skins, − and actuators . However, most of these “smart” electronic devices have conductive fillers (such as carbon nanotubes, , graphene, metal nanoparticles, , conductive polymer, , and so forth) added to flexible substrates. This method provided excellent conductivity but caused the restriction of inherent color and limited extensibility (commonly at 200–400%).…”

In situfabrication of silver/polyimide composite films with enhanced heat dissipation

“…As a result, solution processible poly(amic acid) (PAA) has been used as a precursor to PI, [33][34][35][36] or surface modication with Ag on a PI ber/lm via ion-exchange self-metallization. [37][38][39][40][41] PAA provides sufficient processibility to form a composite with welldistributed Ag particles in the entire lm, but it requires a subsequent imidization step to form PI. On the other hand, the ion-exchange self-metallization on PI lms forms Ag particles on the surface only.…”