Recently, polydimethylsiloxane (PDMS)-based porous materials have been regarded as ideal candidates in various applications. We created a PDMS composite sponge decorated with reduced graphene oxide (rGO)/carbon nanotube (CNT) fillers via polydopamine (PDA). Specifically, a manufactured PDMS sponge was prepared by a sacrificial template approach and then PDA was decorated on a network of PDMS sponges by dopamine selfpolymerization. PDA tightly and firmly attached to the PDMS sponge skeleton, which makes the superhydrophobic PDMS sponge hydrophilic providing adsorption sites for rGO and CNT fillers; thus, the compatibility between fillers and the PDMS matrix was improved. The developed rGO-CNT/PDA@PDMS composite sponge exhibited excellent sensing characteristics, photothermal effect, and superwettability simultaneously. The rGO-CNT/PDA@PDMS-based sensor has a wide strain range (0−60%), high sensitivity (GF = 2.13), and stability (500 loading/unloading cycles). Additionally, rGO-CNT/PDA@PDMS exhibits excellent oil−water separation performance and high-efficiency absorption of oils. Simultaneously, the rGO-CNT/PDA@PDMS sponge was also proved to possess good photothermal conversion performance. Therefore, the environmentally friendly and multifunctional rGO-CNT/PDA@PDMS composite sponge exhibits superior potential for application in flexible intelligent wearable devices, oily wastewater, and seawater desalination.

A novel type of interdigital sensor that has been introduced in this paper can non-destructively detect the thickness of insulating materials, e.g. tire. The sensor was manufactured by jet printing technology with high efficiency. The function of the developed sensor is based on the hindering effect on the transmission of electromagnetic signals. The thickness of the insulating materials can be therefore obtained by monitoring the degree of signal reflection through transmission. For optimization, sensors made with three recipes have been experimentally tested. It is concluded that the sensor with double layers’ structure possesses the optimal performances. Practically, the application of the developed sensor in detecting the wear of tire tread has been carried out.