Atomically Thin TaSe<sub>2</sub> Film as a High‐Performance Substrate for Surface‐Enhanced Raman Scattering
Yuancai Ge, Fei Wang, Ying Yang, Yi Xu, Ye Ying, Yu Cai, Qingwen Zhang, Shengying Cai, Danfeng Jiang, Xiaohu Liu, Bo Liedberg, Jian Mao, Yi Wang
Abstract
Abstract An atomically thin TaSe 2 sample, approximately containing two to three layers of TaSe 2 nanosheets with a diameter of 2.5 cm is prepared here for the first time and applied on the detection of various Raman‐active molecules. It achieves a limit of detection of 10 −10 m for rhodamine 6G molecules. The excellent surface‐enhanced Raman scattering (SERS) performance and underlying mechanism of TaSe 2 are revealed using spectrum analysis and density functional theory. The large adsorption energy and the abundance of filled electrons close to the Fermi level are found to play important roles in the chemical enhancement mechanism. Moreover, the TaSe 2 film enables highly sensitive detection of bilirubin in serum and urine samples, highlighting the potential of using 2D SERS substrates for applications in clinical diagnosis, for example, in the diagnosis of jaundice caused by excess bilirubin in newborn children.