High energy-resolution electron energy loss spectroscopy and near infrared absorption study of cesium tungsten bronze and lanthanum hexaboride

IF 2.6 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters: X Pub Date : 2025-07-12 DOI:10.1016/j.mlblux.2025.100249

Shuzheng Guo , Jingyi Huang , Na Ta , Fengze Cao , Sihua Ha , Shuai He , Jianli He , Luomeng Chao

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Abstract

Cs_0.33WO₃ nanoparticles exhibit strong localized surface plasmon resonance (LSPR), making them effective at absorbing near-infrared (NIR) light. However, effectively tuning the optical absorption of Cs_0.33WO₃ in the critical NIR range of 800–1000 nm has remained a major challenge. In this study, we employ aberration-corrected electron microscopy to conduct high-resolution electron energy loss spectroscopy (EELS) on both Cs_0.33WO₃ and LaB₆ nanoparticles, reveal that the surface plasmon resonance in LaB₆ nanoparticles occurs at a higher energy than in Cs_0.33WO₃, allowing LaB₆ to absorb NIR light at shorter wavelengths. Based on this, we successfully adjusted the absorption characteristics of Cs_0.33WO₃ in the range of 800–1000 nm by utilizing the synergistic LSPR tuning of LaB₆ nanoparticles.

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铯、钨、青铜和六硼化镧的高能分辨电子能量损失光谱及近红外吸收研究

Cs0.33WO3纳米粒子表现出强烈的局部表面等离子体共振（LSPR），使其有效吸收近红外（NIR）光。然而，在800-1000 nm的近红外临界范围内有效调节Cs0.33WO3的光吸收仍然是一个主要的挑战。在本研究中，我们利用像差校正电子显微镜对Cs0.33WO3和LaB6纳米粒子进行了高分辨率电子能量损失光谱（EELS）分析，发现LaB6纳米粒子的表面等离子体共振发生在比Cs0.33WO3更高的能量下，使LaB6能够吸收波长更短的近红外光。在此基础上，我们利用LaB6纳米粒子的协同LSPR调谐，成功调整了Cs0.33WO3在800-1000 nm范围内的吸收特性。

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