Additional file 1.

CNWs grown on a Cu plate and stainless steel plates; emission spectrum of dc glow discharge. Figure S-1 SEM images of CNWs grown on a Cu plate with different surface density. Figure S-2 (a) SEM image showing no presence of CNWs on a stainless steel plate when CH₄ alone is used as the precursor gas. (b) CNWs grown using CH₄ and H₂O. The growth time for both cases is 5 min. Figure S-3 Emission spectrum of glow discharge obtained by subtracting the background signal (without discharge) from the total spectrum (with discharge). Emission lines of OH are remarkable in the spectrum of a CNW sample.

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Yu et al. Nanoscale Research Letters 2011 6:202   doi:10.1186/1556-276X-6-202