Gao Yan, Jin Hua, Zhang Xiao-Wen, Liu Tian-Sheng
School of Information and Network Security, People's Public Security University of China, Beijing 100038, China.
Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China.
ACS Omega. 2024 Aug 27;9(36):37672-37677. doi: 10.1021/acsomega.4c02127. eCollection 2024 Sep 10.
In the past decades, various methods, such as chemical sensing, X-ray screening, and spectroscopy, have been employed to detect explosives for environmental protection and national public security. However, achieving ultrahigh sensitivity for detection, which is crucial for some practical applications, remains challenging. This study employs scanning transmission electron microscopy and electron energy loss spectroscopy (STEM-EELS) to detect individual ∼200 nm explosive nanoparticles of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The vibrational modes of HMX were acquired for each single nanoparticle under the aloof STEM-EELS mode, which ensures damage-free detection. Detailed comparisons with Raman and infrared spectra validate the acquired data's origin. This work highlights STEM-EELS as an effective tool in explosives detection, offering ultrahigh sensitivity, damage-free, and nanometer spatial resolution, with potential applications in environmental protection, public security, and criminal investigations.
在过去几十年里，为了环境保护和国家公共安全，人们采用了各种方法来检测爆炸物，如化学传感、X射线筛选和光谱学等。然而，对于某些实际应用至关重要的实现超高检测灵敏度仍然具有挑战性。本研究采用扫描透射电子显微镜和电子能量损失谱（STEM-EELS）来检测单个约200纳米的八氢-1,3,5,7-四硝基-1,3,5,7-四氮杂环辛烷（HMX）爆炸纳米颗粒。在远离样品的STEM-EELS模式下获取了每个单个纳米颗粒的HMX振动模式，这确保了无损检测。与拉曼光谱和红外光谱的详细比较验证了所获取数据的来源。这项工作突出了STEM-EELS作为爆炸物检测的有效工具，具有超高灵敏度、无损和纳米级空间分辨率，在环境保护、公共安全和刑事调查中具有潜在应用。
