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在ToF-SIMS中获得超高质量的图像用低电流O₂+辅助光束和后侧Au涂层对绝缘样品进行分子成像

Yadong Zhou^1,2,3,4, Jeffrey A Dhas², Mengxue Xia⁵

¹Shanghai Pudong Meteorological Bureau, 951 Jinxiu Road, Pudong District, Shanghai 200135, China.

Analytical chemistry

|April 16, 2025

概括

本研究引入了一种使用O2+离子束和电子束的新方法,以克服飞行时间二次离子质谱 (ToF-SIMS) 成像中的充电问题. 这种技术显著提高了离子图像质量,用于隔离没有污染的样品.

科学领域:

材料科学材料科学材料科学
表面科学是一门学科.
分析化学分析化学

背景情况:

飞行时间二次离子质谱 (ToF-SIMS) 对于分子成像至关重要.
绝缘样本中复杂的充电阻碍了高质量的ToF-SIMS离子图像.
现有的电荷补偿方法,如金属沉积或离子束,都有缺点.

研究的目的:

开发一种有效和广泛适用的方法,用于高质量的ToF-SIMS对绝缘样品的成像.
为了解决ToF-SIMS当前收费补偿技术的局限性.
展示一种使用低电流O2+离子束和低能电子束的新方法.

主要方法:

使用低电流O2+离子束和低能电子束的组合进行电荷补偿.
采用糖薄膜作为模型系统来评估方法.
对高绝缘性样品的背面金涂层进行了调查.
检查现实世界样本以验证技术.

主要成果:

在绝缘样本中成功解决了复杂的充电问题.
实现了超高质量的分子离子图像,光束诱导的损伤最小.
证明了O2+和电子束组合的可行性和有效性.
展示了背面Au涂层对于特别具有挑战性的样品的实用性.

结论:

氧2+离子束和电子束组合是ToF-SIMS对绝缘材料成像的高效方法.
这种方法克服了获得高质量的离子图像的重大障碍.
该方法是实用的,因为O2+离子源在ToF-SIMS仪器中常见,有望广泛应用.

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