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Ultrahigh Pressure-Sensitive Effect Induced by Field Emission at Sharp Nano-Tips on the Surface of Spiky Spherical Nickel Powders

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The spiky spherical nickel powders with sharp nano-tips on their surface are dispersed into cementmatrix to fabricate composites with an ultrahigh pressure-sensitive response. The pressure-sensitive stress coefficient and the pressure-sensitive strain coefficient (i.e., gauge factor) of these composites can reach 0.19 MPa–1 and 1930 respectively. This ultrahigh pressure-sensitive effect is attributed to the unique spiky surface morphology of nickel powders. Unlike the normal smooth spherical nickel particles, the sharp nano-tips on the surface of spiky spherical nickel particles can induce field emission and tunneling effects. This leads to highly sensitive responses to compressive stress and strain.
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Document Type: Research Article

Publication date: 2011-10-01

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