Polymer-iron oxide hybrid films for controlling electrokinetic properties

Preparation and tribological properties of polyurethane/α-aluminum oxide hybrid films

Improving thermal and electrical stability of silver nanowire network electrodes through integrating graphene oxide intermediate layers

Silver nanocubes/graphene oxide hybrid film on a hydrophobic surface for effective molecule concentration and sensitive SERS detection

Continuous hierarchical carbon nanotube/reduced graphene oxide hybrid films for supercapacitors

The effects of crosslinking agents (crosslinkers) on polyimide (PI)/graphene oxide (GO) hybrid films were extensively investigated. The surface of GO was modified with amino groups using 4‐aminobenzylamine to improve compatibility with pyromellitic dianhydride/4,4′‐oxydianiline PI, and two kinds of crosslinkers were used: tris(4‐aminophenyl)amine and 1,3,5‐triazine‐2,4,6‐triamine (melamine). The mechanical, thermal and optical properties of the PI hybrid films were investigated. In particular, the transparency and physical properties of the PI hybrid films containing amino‐functionalized GO with homogeneous dispersion were improved. As the content of the crosslinker increased, a crosslinking network was formed between the PI chains, and the stiffness of the hybrid films was increased. The glass transition temperature, heat resistance and mechanical properties were also enhanced. The PI hybrids prepared with a rigid crosslinker exhibited higher optical transparency due to the reduction of the intermolecular charge transfer interactions with increasing interchain spacing between the PI chains. © 2018 Society of Chemical Industry

Direct messenger ribonucleic acid (mRNA) delivery to target cells or tissues has revolutionized the field of biotechnology. However, the applicability of regenerative medicine is limited by the technical difficulties of various mRNA-loaded nanocarriers. Herein, we report a new conductive hybrid film that could guide osteogenic differentiation of human adipose-derived mesenchymal stem cells (hADMSCs) via electrically controlled mRNA delivery. To find optimal electrical conductivity and mRNA-loading capacity, the polypyrrole-graphene oxide (PPy-GO) hybrid film was electropolymerized on indium tin oxide substrates. We found that the fluorescein sodium salt, a molecule partially mimicking the physical and chemical properties of mRNAs, can be effectively absorbed and released by electrical stimulation (ES). The hADMSCs cultivated on the PPy-GO hybrid film loaded with pre-osteogenic mRNAs showed the highest osteogenic differentiation under electrical stimulation. This platform can load various types of RNAs thus highly promising as a new nucleic acid delivery tool for the development of stem cell-based therapeutics.Electronic Supplementary MaterialSupplementary material (electrochemical and FT-IR analysis on the film, additional SEM, AFM and C-AFM images of the film, optical and fluorescence images of cells, and the primers used for RT-qPCR analysis) is available in the online version of this article at 10.1007/s12274-022-4613-y.

Ultraviolet light sensor based on graphene quantum dots/reduced graphene oxide hybrid film

Gas sensors based on polyaniline/zinc oxide hybrid film for ammonia detection at room temperature

In this study, a well‐ordered unidirectional nanostructure was successfully imprinted on a UV curable polymer/indium oxide hybrid film using UV nanoimprint lithography (NIL). The surface morphologies of the hybrid films were analyzed by atomic force microscopy (AFM), and the uniform nanostructure with a period of 820 nm and height of 30 nm was observed on a 6 min UV‐irradiated film by line profile from AFM. The chemical modification of the films according to UV irradiation time was analyzed by X‐ray photoelectron spectroscopy. The nanopatterned hybrid film was applied to the liquid crystal (LC) alignment layer and the polarized optical microscopy and pretilt angle analysis demonstrated the highly uniform and homogeneous LC alignment state. The unidirectional nanostructure guided the LCs orientation and the aligned surface anisotropy which induces the uniform LC alignment. The hybrid film chemical affinity was analyzed by contact angle measurement, and the increased surface energy after UV irradiation contributed to the homogeneous LC alignment. Therefore, various organic/inorganic hybrid films can be used for nanostructure construction via UV NIL, and it has a high potential for application in diverse LC systems.

Fabrication of rGO/CoSx-rGO/rGO hybrid film via coassembly and sulfidation of 2D metal organic framework nanoflakes and graphene oxide as free-standing supercapacitor electrode

High-performance solvent sensors have extensive applications in many fields. In this work, we report a quite efficient method to fabricate electrically conductive natural rubber (NR)-reduced graphene oxide (RGO) hybrid films for solvent-sensing application. The RGO/NR hybrid films with three-dimensional continuous RGO networks were prepared by blending graphene oxide suspension with rubber latex, followed by solution casting and then in situ hydroiodic acid reduction. The electrical conductivity of hybrid film was as high as 49.3 S/m when filled with 5.00 vol% RGO, and the film exhibited an extremely low percolation threshold of 0.31 vol%. The solvent-sensitive properties were evaluated by detecting the variation in electrical resistance due to the swelling of NR matrix. It was noted that the RGO/NR hybrid films exhibited exceptional stimuli responses for organic solvents, however, with different sensing responses for different solvents. Due to the reconstruction of continuous RGO networks after solvent evaporation, the hybrid films performed an excellent repeatability for solvent sensitivity. Therefore, as intelligent materials, the conductive RGO/NR hybrid films have great potential applications in sensing fields.

A reduced graphene oxide (RGO)–polyethylene oxide (PEO) hybrid film was constructed with composite and bilayer film structures for effective ambient toluene detection.

Acetylcholinesterase-reduced graphene oxide hybrid films for organophosphorus neurotoxin sensing via quartz crystal microbalance

The metal–organic framework (MOF) of Cu3(btc)2 (btc = benzene-1,3,5-tricarboxylic acid) is covalently immobilized at chitosan (CS)–electrochemically reduced graphene oxide (ERGO) hybrid film modified electrode, which is characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectra (EDS), and electrochemistry. The MOF-based electrode is applied as an electrochemical sensing platform for the simultaneous detection of dihydroxybenzene isomers (DBIs) of catechol (CT), resorcinol (RS), and hydroquinone (HQ). The results show that the DBIs present well-resolved and intense voltammetric signals at the modified electrode, due to the synergic effect contributing from Cu3(btc)2 with unique porous framework structure and ERGO with high electronic conductivity. The excellent distinguishing efficiency of the sensor toward DBIs is also confirmed by the quantum chemical computation. Quantitative analysis assays by differential pulse voltammetry shows that the sensor has wide linear ranges and low ...

In this work, we describe the fabrication of an electrochemical sensor for the detection of Hg2+in various water samples. The electrochemical sensor is fabricated on an indium tin oxide (ITO) modified with multi–walled carbon nanotubes (MWCNT) and reduced graphene oxide (RGO) hybrid film. The MWCNT was firstly dispersed using graphene oxide (GO) as dispersant. After coating on the ITO, the GO was then electrochemically reduced to RGO. The obtained thin film was characterized by scanning electron microscope (SEM), FTIR, Raman spectroscopy and 3D optical surface profiler. Cyclic voltammetry and differential pulse voltammetry were employed to investigate the electrocatalytic performance towards the Hg2+ oxidation. Under optimum conditions, the proposed sensor showed a wider linear range at Hg(II) concentrations of 0.05–150 nM. The limit of detection was calculated to be 0.05 nM.