Although various superhydrophobic materials have been manufactured and effectively used for oil–water separation, it is still highly desirable to explore materials which are eco-friendly, low-cost, and multifunctional. In this paper, a stable copolymer solution was prepared from the fluorine-free superhydrophobic copolymer with dual-responsiveness of temperature and pH. The functional superhydrophobic paper was prepared by immersing paper in copolymer solution by the dip-coating method. The surface element and structure analysis of the prepared superhydrophobic paper shows that the dual-responsive copolymer adheres successfully to the surface of the paper without destroying the fiber structure of the paper. At pH ≥ 7 and T > 25 °C, the paper has a good superhydrophobic performance, while under the conditions of pH < 7 and T < 25 °C, the paper comes into a hydrophilic state. Therefore, the dual-responsive superhydrophobic paper is more likely to adapt to the complicated oil-water separation environment than the single-response.

With the rise of new fields such as wearable devices, human health monitoring, and artificial intelligence, flexible sensors have received extensive attention. Conductive hydrogels combine conductive fillers with the excellent properties of hydrogels, making them ideal materials for building flexible sensors. However, conductive hydrogels suffer from poor mechanical properties and low sensitivity, and designing hydrogels with high electrical conductivity and excellent mechanical properties remains a challenge. In this work, a conductive TA-RGO/PVA hydrogel was developed by incorporating TA-RGO nanocomposites into a PVA matrix. The prepared TA-RGO/PVA hydrogel exhibited excellent electrical conductivity, good elastic strain, and excellent mechanical stress. TA-RGO/PVA hydrogels can be used for stretchable strain and pressure sensors. The strain sensor based on the TA-RGO/PVA hydrogel exhibits excellent tensile strain sensitivity (1.936 78 gage factor in the 1%–280% strain region) with excellent stability. The sensor also maintains high sensitivity when used as a pressure sensor (2.2695 kPa−1 in the 0–9 kPa pressure range). These characteristics offer the TA-RGO/PVA hydrogel great potential in the application of wearable flexible strain/pressure sensors and bioelectrodes.

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A large number of researches on the electroless plating of carbon nanotubes and their applications after plating have emerged, which has attracted more and more attention. In this review article, the existing electroless plating methods for carbon nanotubes were briefly summarized, and the surface coatings were listed and analyzed in detail. At last, the related applications after electroless metal/alloy coatings of carbon nanotubes were discussed in detail. This study aims to provide a reference for the research and improvement of different electroless metals/alloys coatings of carbon nanotubes. After a clear understanding of the electroless metal/alloy coatings of carbon nanotubes, the appropriate coating can be selected according to the actual situation, so that the carbon nanotubes after plating can be used as reinforcement and modification materials for better satisfaction of the needs, and the application of plated carbon nanotubes has reference significance in more fields.