Three-dimensional graphite carbon nitride (3D-CN) has received tremendous research interest due to its unique structural features, fascinating physicochemical properties, and widespread potential applications. Most syntheses of 3D-CN mainly focus on developing g-C3N4 (2.7 eV) using soft-templating and hard-templating strategies. Nevertheless, the excellent photocatalytic activity of 3D-CN is related to its small band gap, which is relevant to its structure and the nitrogen (N) content. Meanwhile, it is still a challenge to prepare N-rich CN with special structure and a small band gap using a simple and green strategy. Herein, a novel, mesoporous rod-like and N-rich graphite carbon nitride (RN-g-C3N5) is fabricated by a facile and green KBr-guided approach using 3-amino-1,2,4-triazole. The KBr acting as a guider can be easily removed by water. Surprisingly, the mesoporous rod-like structure makes for the usage of visible light and the enhancement of surface area of RN-g-C3N5. More importantly, the special structure and high N content result in a narrow band gap (1.90 eV). Therefore, RN-g-C3N5 displays notably superior photocatalytic performance. Meanwhile, the RN-g-C3N5 with excellent photocatalytic performance has great prospects in environmental remediation.

A 3D printed flexible tactile sensor with graphene–polydimethylsiloxane (PDMS) microspheres for microstructure perception is presented. The structure of the tactile sensor is inspired by the texture of the human finger and is designed to enable the detection of various levels of surface roughness via the processing of tactile signals. The tactile sensor with a unique graphene–PDMS microsphere structure shows excellent comprehensive mechanical properties, including a robust stretching ability (elongation at break of the sensing layer is 70%), excellent sensing ability (short response time of 60 ms), high sensitivity (sensitivity up to 2.4 kPa–1), and cycle stability (over 2000 loading cycles). In addition, such versatility and sensitivity allow the electronic skin not only to accurately monitor pressure but also to distinguish various surface topographies with microscale differences, and to detect the action of an air fluid.

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