Scheme of set-up for field emission and electroluminescence measurements (a). I-V curves for CNTs (blue), NDs (red) and the CNT-ND hybrid material (black) measured at 50, 100, 300 and 500 μm (b). Arrows indicate the threshold field. Images of light emission from surface of the CNT-ND hybrid material at electric field from 0 to 15 V/μm (c).
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