Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 41, Pages 46571-46577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14148
Keywords
high-aspect-ratio probe; atomic force microscope; electrohydrodynamic printing; 3D nanoscale topography; deep trench
Funding
- Research Grants Council of Hong Kong [27207517, 17208218, 17207419, 17204020, 17208919, 17257016, 17210618]
- Environment and Conservation Fund [ECF 66/2018]
- Platform Technology Funding of the University of Hong Kong
- National Natural Science Foundation of China [11872325]
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With the growing importance of three-dimensional (3D) nanomaterials and devices, there has been a great demand for highfidelity, full profile topographic characterizations in a nondestructive manner. A promising route is to employ a high-aspect-ratio (HAR) probe in atomic force microscopy (AFM) imaging. However, the fabrication of HAR-AFM probes continues to suffer from extravagant cost, limited material choice, and complicated manufacturing steps. Here, we report one-step, on-demand electrohydrodynamic 3D printing of metallic HAR-AFM probes with tailored dimensions. Our additive fabrication approach yields a freestanding metallic nanowire with an aspect ratio over 30 directly on a cantilever within tens of seconds, producing a HAR-AFM probe. Furthermore, the benefits associated with unprecedented simplicity in the probe's dimension control, material selection, and regeneration are provided. The 3D-printed HAR-AFM probe exhibits a better fidelity in deep trench AFM imaging than a standard pyramidal probe. We expect this approach to find facile, material-saving manufacturing routes in particular for customizing functional nanoprobes.
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