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Spiky spherical nickel powder with sharp nano-tips on its surface is a kind of excellent fillers for developing pressure-sensitive cement-based composites/sensors for traffic detection,structural health monitoring,and border and military security.The sharp nano-tips on the surface of spiky spherical nickel particles can induce field emission and tunneling effects,which leads to the ultrahigh pressure-sensitive responses of the cement-based composites.In this paper,we systematically introduce research on nanotip-induced ultrahigh pressure-sensitive cement-based composites/sensors,with attentions to their pressure-sensitive property and sensing mechanism,pressure-sensitive characteristic model,and smart structure system for traffic detection.
Spiky spherical nickel powder with sharp nano-tips on its surface is a kind of excellent fillers for developing pressure-sensitive cement-based composites / sensors for traffic detection, structural health monitoring, and border and military security. Sharp nano-tips on the surface of spiky spherical nickel particles can induce field emission and tunneling effects, which leads to the ultrahigh pressure-sensitive responses of the cement-based composites. In this paper, we systematically introduce research on nanotip-induced ultrahigh pressure-sensitive cement-based composites / sensors, with attentions to their pressure-sensitive property and sensing mechanism, pressure-sensitive characteristic model, and smart structure system for traffic detection.