Tunable lotus-leaf and rose-petal effects via graphene paper origami

Abstract Whereas water drops on both lotus leafs and rose petals have high contact angles, the drops can easily roll off lotus leafs but strongly adhere to rose petals. Here, we report a simple and cost-effective approach to fabricate highly stretchable large-area surfaces that give lotus-leaf and rose-petal effects by harnessing origami patterns formed in graphene paper (GP) bonded on a pre-strained elastomer substrate. The surfaces of the GP origami exhibit high contact angles (>160°) yet robust adhesion to water drops. After depositing a gold film of a few nanometers on the GP, the origami of GP–Au gives high contact angle (>160°) and low roll-off angles (