Recent Study Advances in Flexible Sensors Based on Polyimides

Abstract

With the demand for healthy life and the great advancement of flexible electronics, flexible sensors are playing an irreplaceably important role in healthcare monitoring, wearable devices, clinic treatment, and so on. In particular, the design and application of polyimide (PI)-based sensors are emerging swiftly. However, the tremendous potential of PI in sensors is not deeply understood. This review focuses on recent studies in advanced applications of PI in flexible sensors, including PI nanofibers prepared by electrospinning as flexible substrates, PI aerogels as friction layers in triboelectric nanogenerator (TENG), PI films as sensitive layers based on fiber Bragg grating (FBG) in relative humidity (RH) sensors, photosensitive PI (PSPI) as sacrificial layers, and more. The simple laser-induced graphene (LIG) technique is also introduced in the application of PI graphitization to graphene. Finally, the prospect of PIs in the field of electronics is proposed in the review.

Recent Advances in Wearable Healthcare Devices: From Material to Application

“…For example, the PI film is a stable material at high temperatures and strong acids and bases with high mechanical strength, which makes the processing and modification of PI compatible with more processes and is suitable for use as a base material for sensors [32][33][34]. However, PI is usually not colorless and does not recover under tremendous pressure, limiting its application in wearable, transparent, flexible sensors [35]. The advent of colorless polyimide (CPI) [36,37] has broadened the production of high-performance flexible sensors.…”

Ultraflexible PEDOT:PSS/IrOx-Modified Electrodes: Applications in Behavioral Modulation and Neural Signal Recording in Mice

“…In recent years, the development and advancements in research and processing techniques of flexible polymers have led to their increasing application in the development of neural interfaces, offering the potential for long-term in vivo neural signal recording and stimulation performance. Various polymer materials have already been applied in the development of neural interfaces, including SU8, Parylene, polyimide (PI), and polydimethylsiloxane (PDMS) [8][9][10][11][12][13]. These materials minimize the mechanical mismatch between the brain and flexible probes and reduce post-implantation displacement due to their lower Young's modulus and smaller cross-sectional area, resulting in a smaller bending modulus.…”

Soluble Fluorinated Cardo Copolyimide as an Effective Additive to Photopolymerizable Compositions Based on Di(meth)acrylates: Application for Highly Thermostable Primary Protective Coating of Silica Optical Fiber

“…Polyimides (PIs) are an important class of condensation polymers characterized by high thermal stability and excellent mechanical properties [27][28][29][30][31][32][33]. There are approaches to obtain biocompatible materials by the modification of implantable polyimide films [34] and polyimide covalent organic frameworks for drug delivery applications [35].…”