Experimental conditions Oxygen 8 Carbon nanotubes 6 Chemical vapor deposition 6 Scanning electron microscopy 6 article 6 Activated carbon 4 Atmospheric pressure 4 Cadmium 4 Carbon 4 Carbon dioxide 4 Chemical activation 4 Chemical vapor 4 Chemicals removal (water treatment) 4 Coated substrates 4 Copper 4 Direct electrical heating 4 Electric fields 4 Electric heating 4 Electrochemical measurements 4 Electron emission 4 Electronic properties 4 Ex situ 4 Experimental data 4 FEG-SEM 4 Field emission 4 Field emission measurements 4 Field emission property 4 Field-effect 4 Fowler-Nordheim 4