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Gold nanosprings formed by rolled-up technique

Three-dimensional helical nanostructures have attracted a great deal of attention by the virtue of anomalous properties in mechanics, electricity, electromagnetism and optics due to their intriguing shapes. This paper mainly introduces the fabrication of novel gold nanosprings by using the rolled-up technique and studies their mechanical and piezoresistive properties. Cutting across 80 nm thick gold film deposited on silicon substrate with defective nanofiber probes, we fabricate nanosprings with variable size. Maximum elastic elongation and electromechanical resonance of one gold nanospring are measured. Furthermore, we survey its piezoresistive property. It can be inferred that low stiffness, large displacement and strong piezoresistive effect of gold nanospring make it an excellent candidate for potential application as micro electro-mechanical sensor.