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SEM images of the fabricated CNT emitter. a The CNT mixture layer with the thickness of ~1.5 μm is adhered on the 0.25 mm diameter of the flat W tip surface by sintering. b The CNTs soared from the layer with height of ~0.5 μm and uniformly dispersed on the metal surface except few aggregations. c Drop dried pristine CNT-Ag NP mixture. d Sintered CNT-Ag NP mixture
