Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 67, Issue 11, Pages 5138-5143Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2020.3021625
Keywords
2-D nanomaterials; field emission; Ti3C2Tx; vacuum electronic devices
Funding
- National Natural Science Foundation of China [61771198, 61774061]
- Natural Science Foundation of Shanghai [17ZR1447000, 19ZR1473400]
- Fundamental Research Funds for the Central Universities [40500-20101-222092]
- Joint Institute of Advanced Science and Technology, East China Normal University (ECNU), China
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Although Ti3C2Tx has been widely studied in applications such as electrical storage devices, there are very few reports about the field emission properties of Ti3C2Tx. In this work, 2-D Ti3C2Tx MXene was fabricated by simple etching Al layer from Ti3AlC2 in hydrofluoric acid (HF) at room temperature and employed as a cold cathode for field emission devices. The device presents a high field emission performance with a low turn-on field of 2.7 V/mu m and excellent stability, much lower than the reported value of the former work (around 5 V/mu m), its relative 1-D TiC nanowires (7.1 V/mu m), and most of other 2-D cathode materials, such as MoS2 and graphene, which is found due to its unique accordion structure with evenly distributed sharp edges and enlarged layer spacing reducing the field screening effect. The results confirmed by numerical simulation demonstrate that the local electric intensity at sharp edges indeed significantly higher than that of elsewhere. In other words, more sharp edges owning to the increased interlayer spacing exposed, which can considerably boost field emission performance. Based on experimental data and simulation analysis, the edge effect was found to correspond well with other former reports. Hence, 2-D MXene can be a promising candidate for vacuum electronic applications other than energy storage and conversion devices.
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