Fig. 1: (Left) STM image of the TiO2(110) – (1×2) surface. (Right) Far- (black) and near- (red) field Raman spectra of the surface.Fig. 1 Real-time nanomechanical mapping of Si electrode. Adapted from [2].66We report a microspectroscopic study on the rutile TiO2(110) – (1×2) surface using low-temperature STM-based tip-enhanced Raman spectroscopy (TERS). As shown in Fig. 1, a high-resolution STM image shows a stripe pattern as reported in the literature [1]. While a far-field Raman spectrum of the sample (black curve in Fig. 1) has bulk phonon mode peaks, the near-field spectrum (red curve) acquired with a STM tip closely located over the stripe in the STM image shows additional peaks at ~700–900 and ~2400 cm⁻¹, indicating local vibrational properties at the site. We also found variations in Raman signals at different sites on the surface, indicating that TERS would be a powerful tool to characterize local chemical composition and bonding environments on TiO2 surfaces.Bimodal atomic force microscopy (AFM) offers nondestructive quantitative nanomechanical mapping of various battery materials, simultaneously with topography imaging, by detecting the changes in the amplitude and frequency shift of the first and higher eigen-modes of the cantilever [1]. In this presentation, we will introduce our newly developed operando bimodal AFM system which enables real-time monitoring of nanomechanical phenomena in an amorphous silicon thin film electrode throughout the first electrochemical lithiation/delithiation [2]. The evolution in the topography images and Young’s modulus maps of the Si electrode were successfully acquired as a function of apparent Li content x in lithium silicide (LixSi), as shown in Fig. 1. In the first lithiation, the elastic modulus dramatically decreased due to the formation of LixSi from pristine Si, followed by a moderate modulus reduction with further lithiation up to x = 3.46. In the following delithiation, the elastic modulus gradually recovered up to x = 1.54. Poster Award NomineeP3-07Studying Adsorbates on Rutile TiO2(110) – (1×2) Surface Using Tip-enhanced Raman SpectroscopyKyungmin Kim1,2, Daiki Katsube3, Youngwook Park2, Martin Wolf2, Masayuki Abe1, and Akitoshi Shitoari21 Osaka University2 Fritz Haber Institute3 Japan Fine Ceramics Center[1] C. M. Yim, C. L. Pang, G. Thornton, Surf. Sci., 650, 71-75 (2016).P3-08Unveiling the Nanomechanical Phenomena in Silicon Thin Film Electrodes by Real-time Bimodal Atomic Force Microscopy Imaging Ridwan Putraz1,2, Kyosuke Matsushita2, Tsuyoshi Ohnishi2, and Takuya Masuda1,2 1 Graduate School of Chemical Sciences and Engineering, Hokkaido University 2 Research Center for Energy and Environmental Materials (GREEN), NIMS [1] H. Sakai, Y. Taniguchi, K. Uosaki, T. Masuda, J. Power Sources, 413 (15), 29-33 (2019). [2] R.P. Putra, K. Matsushita, T. Ohnishi, T. Masuda, J. Phys. Chem. Lett., 15 (2), 490 (2024).
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