Therefore, the resistivity of the CNNCs as a whole is calculated. As shown in Figure 4c,d, both the resistance and resistivity of the as-grown CNNCs are obviously affected by the CH4/N2 ratios. It could be found in Figure 4d that the resulted resistivity ρ decreases from 1.01 × 10-3 to 6.45 × 10-5 Ω · m as the CH4/N2 ratio increases from 1/80 to 1/5, which could

be due to the increase of the carbon content in the CNNCs. Figure 4 Electrical testing diagram, TEM micrograph, I – V curves, and the corresponding resistivities. (a) Electrical testing diagram of the Abemaciclib CNNC arrays; (b) TEM micrograph of a CNNC pressed by the platinum cylindrical tip; (c and d) I-V curves and the corresponding resistivities of the samples prepared at CH4/N2 feeding gas ratios of 1/80, 1/40, 1/20, 1/10, and 1/5. Conclusions In summary, the vertically aligned CNNC Selleck TSA HDAC arrays were synthesized on nickel-covered silicon (100) substrates by the GPRD method. The morphologies and composition of the as-grown CNNC arrays are strongly affected by the CH4/N2 feeding gas ratios. The as-grown CNNCs are mainly amorphous CN x , and the atomic content of nitrogen decreases synchronously as the CH4/N2 ratio increases. The CNNC arrays grown at the CH4/N2 ratio of 1/5 have rather perfect cone shapes and good wettability to the polymer P3HT:PCBM. The absorption

GNS-1480 research buy spectra reveal that the optical absorption of the as-grown CNNC arrays increases with increasing CH4/N2 ratio and show a very good absorption in a wideband of 200 to 900 nm at the CH4/N2 ratio of 1/5. The resistivities of the as-prepared samples decrease as the CH4/N2 ratios increase and reach about 6.45 × 10-5 Ω · m at the CH4/N2 ratio of 1/5, indicating that the as-grown CNNC arrays can

have very good conductivity. Due to the GBA3 large specific surface area, high and wide optical absorption, excellent electrical conduction, and nice wettability (to polymer absorbers) of the as-grown CNNC arrays, such nanocone arrays are supposed to be potential electrodes or even absorbers in the thin film solar cells and photodetectors. Authors’ information XL, LG, and XF are graduate students major in fabrication of nanometer materials. YZ is an associate professor and MS degree holder specializing in optical devices. JW is a professor and PhD degree holder specializing in optics and nanometer materials. NX is a professor and a PhD degree holder specializing in nanometer materials and devices, especially in nanoscaled super-hard and optoelectronic devices. Acknowledgements This work is financially supported by the National Basic Research Program of China (973 Program, Grant No. 2012CB934303) and National Natural Science Foundation of China. References 1. Iijima S: Helical microtubules of graphitic carbon. Nature 1991, 354:56–58.CrossRef 2. Ruoff RS, Lorents DC: Mechanical and thermal properties of carbon nanotubes. Carbon 1995, 33:925–930.CrossRef 3.