We report on a systematic study of modulation of the field emission current from carbon nanowalls using a sharp probe as the anode in an ultrahigh vacuum system. Modulation of the local emission current was achieved by either varying the anode-cathode distance (d) with the aid of an AC magnetic field or superimposing a small AC bias on a DC bias during the field emission measurement. Current modulation ratio of over two orders of magnitude was achieved with the modulation becoming more efficient at a smaller d. The experimental results are discussed using the Fowler-Nordheim theory in combination with a simple cantilever model to account for the modulation effect. The experimental results demonstrated good static stability and dynamic controllability of local field emission current from the carbon nanowalls.
@article{arxiv.1409.2644,
title = {Dynamic Control of Local Field Emission Current from Carbon Nanowalls},
author = {Ying Wang and Yumeng Yang and Yihong Wu},
journal= {arXiv preprint arXiv:1409.2644},
year = {2023}
}