Figure 10From: Synthesis and Enhanced Field-Emission of Thin-Walled, Open-Ended, and Well-Aligned N-Doped Carbon NanotubesCNT film peeled off and its SEM image: a CNT film peeled off from quartz slide and transferred into water, b CNT film spreading after dropping some ethanol to water, c the free-standing film obtained after drying in oven, d SEM image of the as-obtained CNTsBack to article page