Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences（中国科学院长春光学精密机械与物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；State Key Laboratory of Advanced Manufacturing for Optical Systems（光学系统先进制造国家重点实验室）；Haining High-tech Research Institute（海宁高科技研究院）；Cardiff University（卡迪夫大学）
Qingyi Wu, Xusheng Tang, Francesco Masia, Peng Liang, Hao Peng, Lindong Shang, Yuntong Wang, Yue Qu, Wolfgang Langbein, Bei Li
Raman spectroscopic imaging has emerged as a potent tool due to its non-invasive nature and capability for chemical composition analysis. Line-scan Raman spectroscopy accelerates imaging speed by two orders of magnitude compared to point detection Raman methods. However, further enhancements in imaging speed were constrained by the readout speed of typically used charge-coupled device (CCD) spectroscopic detectors. We developed an ultra-fast line-scan Raman imaging technique based on recently available complementary metal-oxide-semiconductor (CMOS) detectors with low cost and read noise, and fast readout during exposure combined with a global shutter. Employing a high-efficiency transmissiongrating imaging spectrometer, we demonstrate imaging speeds up to two orders of magnitude faster than traditional line scan Raman imaging techniques and up to four orders of magnitude faster than point scan Raman methods, achieving Raman imaging up to 80 kHz spectral rate. We demonstrate that this technology is applicable to a variety of samples, including microplastics, biological cells, and tablets, creating images in an extremely short time frame, showcasing exceptional detection capabilities and the ability to reveal detailed information.
A Spontaneously Formed Plasmonic-MoTe2 Hybrid Platform for Ultrasensitive Raman Enhancement
开发高灵敏度、稳定性和可重复性的表面增强拉曼散射（SERS）基底是分析检测的关键，这对传统的金属结构是一个挑战。本文中，通过利用1 T '过渡金属碲化物的高表面活性，我们通过简单的方法在1 T' MoTe 2原子层上原位自发制备了高密度的金纳米颗粒（AuNPs），形成等离子体-二维材料混合SERS基底。这种AuNP的形成是1 T '相所特有的，其在具有较小表面活性的2 H MoTe 2中被抑制。该混合结构产生电磁和化学增强的耦合效应，以及优异的分子吸附，导致超灵敏（4*10^-17 M）和可重复的检测。此外，极大地避免了荧光和光漂白现象。柔性SERS带已在实际应用中得到证实。我们的方法有利于通过一种简单的方法进行超灵敏的SERS检测，以及更好地理解等离子体效应之外的SERS机制。
