Scanning Nanowire Probe Interferometer for Scalable Humidity Mapping,Advanced Materials Technologies

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Scanning Nanowire Probe Interferometer for Scalable Humidity Mapping
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-02-24 , DOI: 10.1002/admt.201900937
Namho Kim ₁ , Junho Lee ₁ , Moon‐Jung Yong ₁ , Un Yang ₁ , Ji Tae Kim ₂ , Jonghwan Kim _{3,

4} , Byung Mook Weon ₅ , Chong Cook Kim ₁ , Jung Ho Je ₁

Affiliation

Quantifying humidity has long been an unavoidable task in science, industry, and society. Recent developments of nanoscience and technology that deal with ultrasmall droplets have aroused interest in microscopic moisture. Utilization of nanomaterials has been emerging as a promising strategy to miniaturize hygrometers for high‐sensitive, ultrasmall‐area sensing. However, a lack of high‐precision, on‐demand position control of sensing nanomaterials makes it difficult to explore spatial distribution of humidity at the micro‐ and nanoscale. Here, a scanning probe hygrometry (SPH) is developed that enables not only micro/nanoresolution but also scalable spatial mapping of humidity distribution. The SPH is realized with an unprecedented scanning nanowire probe interferometer (NPI) that is produced by direct 3D nanoprinting of a moisture‐sensitive polymer on a tapered optical fiber. Notably, the interferometric response of the NPI probe in ultrasmall areas quantitatively depends on humidity, arising from its refractive index change and volumetric swelling. By scanning the NPI probe and reading out the interferometric signals, multiscale spatial mapping of humidity distribution with versatile scanning steps from ≈10² nm to a few mm is demonstrated. The NPI is expected to provide a new nanoscale metrology that can answer fundamental questions about evaporation‐related science and engineering.

中文翻译：

扫描纳米线探针干涉仪，可扩展湿度映射

长期以来，量化湿度一直是科学，工业和社会中不可避免的任务。涉及超小液滴的纳米科学技术的最新发展引起了人们对微观水分的兴趣。纳米材料的利用已经成为使湿度计小型化以实现高灵敏度，超小面积感测的一种有前途的策略。但是，由于缺乏对感测纳米材料的高精度按需位置控制，因此很难在微尺度和纳米尺度上探索湿度的空间分布。在这里，开发了一种扫描探针湿度法（SPH），它不仅可以实现微米/纳米分辨率，还可以实现湿度分布的可扩展空间映射。SPH是通过前所未有的扫描纳米线探针干涉仪（NPI）实现的，该干涉仪是通过在锥形光纤上直接对水分敏感聚合物进行3D纳米打印而制成的。值得注意的是，NPI探针在超小区域的干涉响应在定量上取决于湿度，这是由其折射率变化和体积膨胀引起的。通过扫描NPI探针并读取干涉信号，利用≈10的通用扫描步骤对湿度分布进行多尺度空间映射演示了² nm到几毫米。NPI有望提供一种新的纳米级计量学，可以回答有关蒸发相关科学和工程学的基本问题。

更新日期：2020-02-24

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