Graphene oxide (GO) can be readily modified for particular applications due to the existence of abundant oxygen-containing functional groups. Graphene oxide-based materials (GOBMs), which are biocompatible and hydrophilic, have wide potential applications in biomedical engineering and biotechnology. In this review, the preparation and characterization of GO and its derivatives are discussed at first. Subsequently, the biocompatibility and tribological behavior of GOBMs are reviewed. Finally, the applications of GOBMs as lubricants in bio-tribological systems are discussed in detail.

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The bending-induced micro-crack leads to the incomplete rupture of the conducting filaments and reduces the local depletion-region width.

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The charge transport of Ru(II) complex molecular junctions, fabricated using a soft stamp-printing method, was investigated from 95 to 299 K under both dark and light conditions in order to explore the roles of the electrode/molecule interface and complex properties in the device performance. The junctions show asymmetric current-voltage characteristics with conductance switching and a photovoltaic effect at low temperature. The device performance depends greatly on the redox characteristics and built-in potential induced by electrode/molecule interface(s) and the molecular dipole. Our work may provide valuable information for the design of novel molecular electronics.

We systematically studied the charge transport properties of a series of self-assembled monolayer crossbar junctions with different alkanethiol and conjugated molecules, respectively. The junction was fabricated using a soft stamp-printing method. Current–voltage characteristics were measured at varied temperatures between 300 down to 90 K under different light illumination conditions. Strong temperature dependence and optoelectronic switching phenomena were observed in the as-fabricated junctions in both dark and light situations. To understand the charge transport mechanism, the Simmons and Fowler–Nordheim tunneling were used to analyze the experimental data. The distinctly different adsorbing nature of the top printed Au/molecule interface in the crossbar junctions is shown to play a dominant role in causing the asymmetric transport behavior. The charge injection barrier is strongly dependent on both the substrate temperature and the molecular length/conjugation structures. The barrier decreases with the increase of the substrate temperature and/or the molecular length, while a conjugated molecular structure can obviously enhance the junction charge transport. Our work may offer some useful information for developing molecular electronic devices.