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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Effect of Enhanced Thermal Stability of Alumina Support Layer on Growth of Vertically Aligned Single-Walled Carbon Nanotubes and Their Application in Nanofiltration Membranes

Fig. 4

a, b TEM images of CNTs grown on alumina deposited by a nonreactive sputtering and b reactive sputtering. CNTs grew from the catalyst with different diameter distributions; histograms (c) and (d) result from analysis of many images such as (a) and (b), respectively. The mean diameters of c and d are approximately 1.4 and 1.2 nm, respectively. e, f Raman spectra (excitation at 632.8 nm) collected from the top of the produced nanotube forests. The red (upper) curve indicates the Raman spectrum from CNTs on the stable alumina, and the blue (lower) curve corresponds to the spectrum from CNTs on the unstable alumina

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