非晶态碳涂层对液相透射电子显微镜（LP-TEM）性能和封闭Pt纳米胶体动力学的影响。

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-03-11 DOI:10.1093/jmicro/dfac012

Xiaoguang Li, K. Mitsuishi, M. Takeguchi

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引用次数: 1

摘要

超薄氮化硅(SiN)膜是用于透射电子显微镜的基于微结构的液体电池(lc)的关键。本研究采用自制的LC和50 nm的SiN膜，研究了2.58 nm铂纳米粒子(NPs)在约200 nm深水中的动力学。当施加电子通量为2.5 × 103 ~ 1.4 ×106 e-/(nm2·s)的强光束来分解NPs时，会导致NP聚集，甚至在顶部膜上钻出孔。通过在膜的两侧涂覆1-4 nm厚的非晶碳层，防止了孔的钻出。NP聚集率也随碳厚度的增加而降低。克服上述问题后，当纳米粒子附着在含有薄液体层的4纳米碳包覆LC膜上时，可以看到Pt纳米粒子的晶格条纹。研究并讨论了电子束和碳对LC和Pt纳米粒子的影响。本工作为强电子束LC-TEM研究提供了参考。

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Effect of Amorphous Carbon Coating on the Performance of Liquid Phase Transmission Electron Microscopy (LP-TEM) and the Dynamics of Enclosed Pt Nano-Colloids.

Ultra-thin silicon nitride (SiN) membranes are critical in microfabrication-based liquid cells (LCs) for transmission electron microscopy. This study used a homemade LC with a 50-nm SiN membrane to study the dynamics of 2.58-nm platinum (Pt) nanoparticles (NPs) in approximately 200-nm deep water. When a strong beam with electron flux ranging from 2.5 × 103 to 1.4 ×106 e-/(nm2·s) was applied to resolve the NPs, the beam caused NP aggregation and even drilled a hole on the top membrane. The hole drilling was prevented by coating a 1-4-nm-thick amorphous carbon layer on both sides of the membrane. The NP aggregation rate also decreased with increasing carbon thickness. After overcoming the aforementioned issues, lattice fringes of the Pt NPs were visible when the NPs were attached to the membrane of the 4-nm-carbon-coated LC containing a thin liquid layer. The effects of the electron beam and carbon on the LC and Pt NPs were investigated and discussed. This work provides a reference for LC-TEM research using strong electron beams.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.