2018年10月26日 · 锂离子插层法是一种常用的二维半导体纳米片剥离方法，然而在嵌锂过程中，大量的锂离子导致电子注入到MoS2晶体中，发生相变（2H相转变为1T相），电学性能下降。 然而，研究者发现导致相变的主要原因是电子注入超过某一阈值（0.29个电子每MoS2单元），那么换句话说，利用半径较大的阳离子插层，可以减少阳离子嵌入数量，从而使注入电子降低到阈值以下，防止相变的发生。 于是，研究者选中了季铵盐，例如溴化四庚基铵（THAB）。 MoS2纳米 …

The vertical dashed lines indicate the four absorption peaks in the spectrum of THAB–exfoliated MoS2. c, XPS spectra of THAB–exfoliated MoS2 and Li–exfoliated MoS2, showing the pure 2H phase...

2021年3月1日 · The x-ray photoelectron spectroscopy (XPS) was done using a monochromatic Al K α line in an XPS measurement system from Omicron Nanotechnology. The transportation measurements were performed using a Keithley 6514 electrometer and a Cryogenics cryostat in a high vacuum condition.

XPS Key ideas to take away • XPS provides detection limits to ~0.1% atomic • XPS is very surface sensitive (top <10 nm) • XPS gives chemical bonding information • XPS is useful for surveys of unknown contamination • Can combine with ion sputtering to …

2022年12月1日 · XPS allows studies on the passivity of films at surfaces and their breakdown in an aqueous environment, their adhesion, mass transport, and selective oxidation phenomenon. XPS has been crucial in understanding the role of Cr and Mo elements in stainless steels and the mechanism of passivity.

2023年5月25日 · X-ray photoelectron spectroscopy (XPS) is a popular analytical technique in materials science as it can assess the surface chemistry of a broad range...

XPS, 全称为X-ray Photoelectron Spectroscopy（X射线光电子能谱）, 早期也被称为ESCA (Electron Spectroscopy for Chemical Analysis)，是一种使用电子谱仪测量X-射线光子辐照时样品表面所发射出的光电子和俄歇电子能量分布的方法。 XPS可用于定性分析以及半定量分析, 一般从XPS图谱的峰位和峰形获得样品表面元素成分、化学态和分子结构等信息，从峰强 可获得样品表面元素含量或浓度。 XPS测表面还是体相？ XPS是一种典型的表面分析手段。其根本原因在 …

2019年12月5日 · X-ray photoelectron spectroscopy (XPS) is widely used to identify chemical species at a surface through the observation of peak positions and peak shapes. It is less widely recognized that intensities in XPS spectra can also be used to …

该系统具备微区分析功能，可以针对微米级别的特定区域开展元素组分与电子结构分析，是目前观测薄膜样品元素和价态分布，进而探索其生长机理最有力的工具之一. 7、配有角分辨ARXPS,用于10nm以内各深度的无损XPS分析。 Basic information. X-ray photoelectron spectroscopy (Thermo Sientific, ESCALAB Xi+)...

2022年6月26日 · X-ray photoelectron spectroscopy (XPS) plays a crucial role in the surface analysis of different organic and inorganic materials. The information that could be obtained through XPS analysis (chemical state, coordination, particle size) is very important from the material science point of view.