Flexible electronics, which can be distributed on any surface we need, are highly demanded in the development of Internet of Things (IoT), robot technology and electronic skins. Temperature is a fundamental physical parameter, and it is an important indicator in many applications. Therefore, a flexible temperature sensor is required. Here, we report a simple method to fabricate three lightweight, low-cost and flexible temperature sensors, whose sensitive materials are reduced graphene oxide (r-GO), single-walled carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs). By comparing linearity, sensitive and repeatability, we found that the r-GO temperature sensor had the most balanced performance. Furthermore, the r-GO temperature sensor showed good mechanical properties and it could be bent in different angles with negligible resistance change. In addition, the performance of the r-GO temperature sensor remained stable under different kinds of pressure and was unaffected by surrounding environments, like humidity or other gases, because of the insulating layer on its sensitive layer. The easy-fabricated process and economy, together with the remarkable performance of the r-GO temperature sensor, suggest that it is suitable for use as a robot skin or used in the environment of IoT.

The flammability of organic electrolyte solutions has a safety risk during the large-scale application of energy storage devices. Therefore, it is essential to suppress the flammability of organic electrolyte solutions. In this article, the flame-retardant electrolyte solution of 3 M LiPF 6 -ethyl methyl carbonate (EMC)/trimethyl phosphate (TMP) (7:3 by vol) has been applied in a Li/graphite dual-ion battery. Both the initial-cycle discharge capacity (almost 100 mAh g −1 ) and capacity retention rate (92.3% after 450 cycles) surpass those for the battery using 1 M LiPF 6 -EMC. Besides, the burning times of the above electrolyte solutions are 6 and 66 s, respectively. Conventional electrochemical tests, ex situ X-ray diffraction, and nuclear magnetic resonance have been carried out to explore the influences of TMP on PF 6 − in EMC/TMP mixed solvents.

A highly efficient, air-and moisture-stable and easily recoverable magnetic nanoparticle-supported palladium catalyst has been developed for the Suzuki, Sonogashira and Heck reactions. A wide range of substrates was coupled successfully under aerobic conditions. In particular, the performance of the magnetic separation of the catalyst was very effi-cient, and it is possible to recover and reuse it at least eight times without significant loss of its catalytic activity.