Zhang Wenqi, Chao Peidong, Chen Donglei, Yang Zhan, Dong Lixin
Jiangsu Provincial Key Laboratory of Advanced Robotics, School of Mechanical and Electric Engineering, Soochow University; Suzhou 215000, China.
Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China.
Nanomaterials (Basel). 2023 Jan 28;13(3):532. doi: 10.3390/nano13030532.
A hybrid core-shell structured nanowire is proposed for a long-term stable electron source based on an isolated platinum/multi-walled carbon nanotube (Pt/MWCNT). This hybrid nanowire is prepared by growing a Pt shell on a metallic MWCNT through a field-emission-induced deposition (FEID) method. An in situ field emission (FE) platform was constructed inside a scanning electron microscope (SEM) equipped with two nanorobotic manipulators (NRMs) for the preparation and testing of the hybrid nanowire. An in situ fatigue test was conducted with high current intensity (500 nA) to show the influence of the Pt shell. Compared with the pristine bare MWCNT, our hybrid-nanowire-based electron source has a lifetime of hundreds of times longer and can work continuously for up to 48 h under relatively high pressure (3.6×10-3 Pa) without having an apparent change in its structure or emission currents, demonstrating good stability and tolerance to poor working conditions. The anomalous long-term stability is attributed mainly to the shielding of oxygen by Pt from the carbon shells and less heating due to the work function lowering by Pt.
基于孤立的铂/多壁碳纳米管（Pt/MWCNT），提出了一种用于长期稳定电子源的核壳结构混合纳米线。这种混合纳米线是通过场发射诱导沉积（FEID）方法在金属MWCNT上生长铂壳而制备的。在配备有两个纳米机器人操纵器（NRM）的扫描电子显微镜（SEM）内构建了一个原位场发射（FE）平台，用于混合纳米线的制备和测试。以高电流强度（500 nA）进行了原位疲劳测试，以显示铂壳的影响。与原始的裸MWCNT相比，我们基于混合纳米线的电子源的寿命延长了数百倍，并且在相对较高的压力（3.6×10-3 Pa）下可以连续工作长达48小时，其结构或发射电流没有明显变化，显示出良好的稳定性和对恶劣工作条件的耐受性。异常的长期稳定性主要归因于铂对碳壳中氧气的屏蔽以及铂降低功函数导致的较少发热。
