Figure 1
FESEM images of the CNNC arrays grown at different CH 4 /N 2 feeding gas ratios. (a) 1/80, (b) 1/40, (c) 1/20, (d) 1/10, (e and f) 1/5. (f) The surface morphologies of the P3HT:PCBM-covered CNNC arrays grown at a CH4/N2 feeding gas ratio of 1/5. The samples were prepared on the nickel-covered silicon (100) wafers for 40 min, with a discharge current of 180 mA and a discharge voltage of 350 V.