SBIR Phase I: Liquid Helium Transmission Electron Microscopy (TEM) Sample Holder for Atomic Imaging of Next-Generation Materials

这个小企业创新研究第一阶段项目旨在通过开发稳定的液氦透射电子显微镜（TEM）样品支架，在低至10 K的温度下实现材料和器件的原子和纳米级成像。虽然TEM成像模式是材料科学中使用的最强大的计量工具之一，但长期以来缺乏稳定的超低温能力限制了它们在相对高温下工作的材料和技术的应用范围。最先进的TEM机器迫切需要稳定的超低温能力，以便在广泛的新兴领域进行科学发现和开发，这些领域以前无法进入。该项目瞄准并扩大了电子显微镜市场（预计到2028年将超过100亿美元），该市场与半导体、量子器件、可再生能源和生命科学市场的计量需求同步快速增长。该项目包括开发和测试一种具有高稳定性的新型低温样品架，以及液氦温度下高分辨率TEM成像和稳定性指标的量化。为了成功地收集原子分辨率或高质量的光谱数据，高热和振动稳定性，长保持时间和精确的温度控制是必要的。目前的低温支架不仅无法达到足够冷的温度，而且还存在显著的不稳定性和热损失，严重影响了图像分辨率。它们依赖于小的低温杜瓦瓶，当不稳定的冷冻剂（液氦）迅速蒸发时，杜瓦瓶会导致剧烈的温度波动和振动。该项目采用了创新的设计，控制液氦流冷却，振动解耦，并在长时间保持精确的温度调节。该技术将导致商用仪器的发展，将任何TEM转变为超低温成像平台，能够表征下一代技术的新材料。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This Small Business Innovation Research Phase I project aims to enable atomic- and nano-scale imaging of materials and devices at temperatures as low as 10 K through the development of a stable liquid helium transmission electron microscope (TEM) specimen holder. Though TEM imaging modalities are amongst the most powerful metrology tools used in materials science, a long-standing lack of stable ultra-low temperature capabilities limits the range of their application to materials and technologies that operate at relatively high temperatures. Stable ultra-low-temperature capabilities are urgently needed for state-of-the-art TEM machines to enable scientific discovery and development across a broad range of emerging, previously inaccessible fields. This project targets and expands the electron microscopy market (expected to exceed $10 billion by 2028) which is rapidly growing in tandem with metrology needs of semiconductor, quantum device, renewable energy, and life-sciences markets.This project includes the development and testing of a novel cryogenic specimen holder with high stability as well as the quantification of high-resolution TEM imaging and stability metrics at liquid helium temperatures. To successfully gather atomic resolution or high-quality spectroscopic data, high thermal and vibrational stability, long hold times, and precise temperature control are necessary. Current low-temperature holders are not only incapable of reaching cold enough temperatures, but they suffer from significant instabilities and thermal losses, heavily affecting image resolution. They rely on small cryogenic dewars which lead to severe temperature fluctuations and vibrations as the unstable cryogen (liquid helium) rapidly evaporates. This project incorporates an innovative design with controlled liquid helium flow cooling, vibration decoupling, and precise temperature regulation over long hold times. The technology will result in the development of a commercial instrument that turns any TEM into an ultra-low-temperature imaging platform capable of characterizing novel materials for next-generation technologies.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.