Presentation Information
[2E02【若手学会賞】]Ultra-High Temperature TPD: A Frontier Tool for Light Element Characterization
*Takeharu Yoshii1 (1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University)
Temperature-Programmed Desorption (TPD) is a destructive analytical method in which a sample is heated while desorbed gases are analyzed by mass spectrometry, often used to study functional groups on carbon edges. Conventional TPD systems are limited in temperature and inadequate for analyzing heteroatoms such as nitrogen. To address this, we developed a custom-built, high-sensitivity TPD apparatus using induction heating, capable of reaching ultrahigh temperatures under vacuum. This enabled detection of nitrogen-containing gases (e.g., NH3, HCN, N2) over a wide range. Combined with XPS, synchrotron XAS, and DFT calculations, desorption profiles gave qualitative and quantitative insights into nitrogen species, including pyrrolic, pyridinic, and graphitic types. The technique also showed high accuracy for trace-level nitrogen. Extending beyond carbon materials, this method applies to light-element dopants in oxide systems, such as nitrogen in perovskites and hydroxyl groups in zeolites.