Excellent-Moisture-Resistance Fluorinated Polyimide Composite Film and Self-Powered Acoustic Sensing

Abstract

As a clean, sustainable energy source, sound can carry a wealth of information and play a huge role in the Internet of Things era. In recent years, triboelectric acoustic sensors have received increasing attention due to the advantages of self-power supply and high sensitivity. However, the triboelectric charge is susceptible to ambient humidity, which reduces the reliability of the sensor and limits the application scenarios significantly. In this paper, a highly moisture-resistant fluorinated polyimide composited with an amorphous fluoropolymer film was prepared. The charge injection performance, triboelectric performance, and moisture resistance of the composite film were investigated. In addition, we developed a self-powered, highly sensitive, and moisture-resistant porous-structure acoustic sensor based on contact electrification. The detection characteristics of the acoustic sensor are also obtained.

Passivating Defects via Retarding the Reaction Rate of FAI and PbI2 Enables Stable Perovskite Solar Cells

“…The contact angle of the TTA-modified film is about 76° while that of the control film is about 58°. The increase in contact angle proves that TTA can improve the hydrophobicity of perovskite, which can be attributed to the C–F groups in TTA . Next, to study the effect of TTA on the stability of the PSCs, the retention PCE of the unencapsulated devices is investigated under various storage conditions (both devices were tested under dark conditions).…”

Ultrafast Graphene Oxide-Lignin Biopolymer Nanocomposite Membranes for Separation of Biomolecules, Dyes, and Salts

“…This is also supported with the Hagen−Poiseuille theoretical models and experimental work. 28 Furthermore, the water permeance of the 240-nm thick GOLB membrane reaches 1300 L m −2 h −1 bar −1 , which is significantly greater than the permeance of most GO and rGO filtration membranes (Table S2).…”

“…In this regard, several strategies have been developed to enhance the permeability, separation efficiency, and stability of GO-based membranes. These include thermal treatment, chemical treatment involving reduction and oxidation processes, cross-linking and functionalization of GO nanosheets, modification of experimental conditions such as pH, salt concentration, and pressure, as well as controlling nanochannel capillaries. − …”

Bandgap reduction and efficiency enhancement in Cs2AgBiBr6 double perovskite solar cells through gallium substitution

“…[23][24][25][26] However, the Cs 2 AgBiBr 6 solar cell encounters challenges related to efficiency, primarily attributed to its wide E g . [27][28][29] The process of substitution with impurity ions has been acknowledged as a potent approach for augmenting the optical characteristics of halide perovskites. Indeed, among the array of strategies, substitution stands out for its simplicity and ease of application.…”