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Controlled Fabrication of Gold Nanotip Arrays by Nanomolding-Necking Technology
摘要： The fabrication of nanotips has been driven by the increasing industrial demands in nanodevices for a wide range of applications, such as probing, sensing, antireflection coating and nanoindentation. In this work, we proposed a controlled, rapid as well as low cost nanomolding-necking technology to fabricate gold nanotips arrays. The geometries of gold nanotips with cone angle range of ~28-84° and curvature radii of < 5 nm can be prepared by tailoring the diameters of raw nanorods in nanomolding process or modulating the necking temperature. Molecular dynamics simulation reveals that the formation of the nanotip geometries are determined by the interplay between dislocation-based and diffusion-based deformation mechanisms, intrinsically arising from the nonlinear dependence of atom diffusion on temperature and sample size. The strong controllability, mass production and low-cost of the developed nanomolding-necking technology make it highly promising in developing high-performance multifunctional nanodevices.
关键词： nanomolding-necking,nanotips,controlled fabrication.
更新于2025-09-16 10:30:52
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Electrochemical etching of lightweight nanotips for high quality-factor quartz tuning fork force sensor: atomic force microscopy applications
摘要： Commercially available quartz tuning forks (QTFs) can be transformed into self-sensing and actuating force sensors by micro-assembling a sharp tip on the apex of a tine. Mass of the tip is critical in determining the quality (Q)-factor of the sensor, therefore, fabrication of the lightweight nanotips is a precondition for high Q-factor QTF sensors. The work reports fabrication of very lightweight tungsten nanotips with a two-step electrochemical etching technique which can be used to develop high Q-factor QTF force sensor. First, a tungsten wire with protective coating at one end (1–2 mm) is etched with a trapezoidal waveform to form a lengthy (～2–5 mm) and slender (diameter ～10–40 μm) micro-needle. In the second step, sharp tip apex is fabricated with a direct current etching. High Q-factor (6600–8000) QTF force sensors have been developed with the fabricated nanotips. Atomic force microscope scanning of nano-grating and a triblock copolymer surface validates the scanning performance of the developed sensors.
关键词： quartz tuning fork,nanotips,atomic force microscopy,force sensor,electrochemical etching
更新于2025-09-04 15:30:14