Abstract The high integration and multifunctionality in flexible electronic device play an important role in its development. In this study, we developed multifunctional hydrogels integrated with supercapacitive, photoelectric, and strain-sensing capabilities. The hydrogel composite consists of PAM/PVA matrix with polyaniline (PANI) and reduced graphene oxide (rGO) as conductive components. Two different acid dopants, citric acid (CA) and hydrochloric acid (HCl), were employed to investigate their impact on photoelectrochemical capabilities of hydrogels. Both CA-doped and HCl-doped hydrogels exhibited remarkable supercapacitive performance, achieving areal capacitances of 492 mF/cm 2 and 538 mF/cm 2 , respectively. Furthermore, both hydrogels demonstrated photosensitivity towards shorter wavelengths such as ultraviolet (380 nm) and blue (475 nm) light. Lastly, the proposed hydrogels serving as highly sensitive strain sensors was verified through effectively sensing arm bending movements.
In this paper, TiO2/PANI/graphene–PVA hydrogel (TPGH) is fabricated by combining TiO2/PANI/graphene powder with poly(vinyl alcohol) (PVA) hydrogel. X-ray diffraction (XRD) patterns, Fourier transform infrared (FTIR) spectra, and photocurrent patterns indicated that TiO2/PANI/graphene had an excellent photoelectrical response because the introduction of polyaniline (PANI) into the TiO2 system can promote the separation of photogenerated electrons and holes. Meanwhile, graphene can be used as an acceptor for photogenerated electrons in composites and can prevent carrier recombination and increase charge transfer. This hydrogel exhibits recyclability and excellent photo-electrocatalysis properties, which is attributed to the excellent photoelectric response properties of TiO2/PANI/graphene. The hydrogels with the best photocatalytic performance can degrade methyl orange and RhB more than 98% within 60 min and bisphenol A more than 97% within 150 min. Moreover, 88% degradation rate remained after five cycles for hydrogels, which indicated that the hydrogels had good cycling performance. The findings provide a new strategy for the construction of TiO2/PANI/graphene photocatalysts and pave an alternative way to the design and synthesis of recyclable hydrogel photocatalysts.
Abstract The biocomposites of poly (lactic acid) (PLA) involving 15 % mass fraction of calcium sulfate whiskers (CSW) were prepared via melt-blending technology, in an effort of toughening PLA and enhancing the thermal stability. The morphological structure, impact toughness, thermal stability as well as kinetic analysis on thermal decomposition for PLA/CSW composites were performed thoroughly. The results showed that CSW was organized successfully via silanization, helping to form well-bonded interfaces, and accordingly, the impact toughness increased remarkably. The thermal stability was enhanced by adding whiskers, leading to increased decomposition temperature and decreased mass conversion rate. Kinetic analysis revealed the great dispersions on the reaction order and activation energy. Though, in comparison to pure PLA, the reaction order of PLA/CSW composites increased based on calculation methods except for Carrasco's, the activation energy of the composites declined independently of the applied mathematical models, meaning that thermal decomposition of PLA phase was accelerated by the introduced CSW.
Herein, we first report a novel approach for preparing 3D π-π stacked crystals of polyaniline and polypyrrole and show how they self-assemble in a suitable solution environment. 3D crystals of polyaniline and polypyrrole show high charge-transport properties of 130 S cm(-1) and 150 S cm(-1), respectively. Remarkably, the 3D crystals of polyaniline obtain excellent anisotropic conductivity.
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