All Publications

  • Direct Observation of the Pressure-Induced Structural Variation in Gold Nanoclusters and the Correlated Optical Response. Nano letters Li, Q., Zeman, C. J., Kalkan, B., Kirschbaum, K., Gianopoulos, C. G., Parakh, A., Doan, D., Lee, A. C., Kulikowski, J., Schatz, G. C., Shen, G., Kunz, M., Gu, X. W. 2022


    The ability to gradually modify the atomic structures of nanomaterials and directly identify such structural variation is important in nanoscience research. Here, we present the first example of a high-pressure single-crystal X-ray diffraction analysis of atomically precise metal nanoclusters. The pressure-dependent, subangstrom structural evolution of an ultrasmall gold nanoparticle, Au25S18, has been directly identified. We found that a 0.1 Å decrease of the Au-Au bond length could induce a blue-shift of 30 nm in the photoluminescence spectra of gold nanoclusters. From theoretical calculations, the origins of the blue-shift and enhanced photoluminescence under pressure are investigated, which are ascribed to molecular orbital symmetry and conformational locking, respectively. The combination of the high-pressure in situ X-ray results with both theoretical and experimental optical spectra provides a direct and generalizable avenue to unveil the underlying structure-property relations for nanoclusters and nanoparticles which cannot be obtained through traditional physical chemistry measurements.

    View details for DOI 10.1021/acs.nanolett.2c03759

    View details for PubMedID 36577713

  • Detection of voids in hydrogen embrittled iron using transmission X-ray microscopy INTERNATIONAL JOURNAL OF HYDROGEN ENERGY Lee, A. C., Parakh, A., Sleugh, A., Tertuliano, O. A., Lam, S., Weker, J., Hosemann, P., Gu, X. 2023; 48 (5): 1968-1978
  • High-pressure deformation of metallic glass nanoparticles JOURNAL OF NON-CRYSTALLINE SOLIDS Parakh, A., Kiani, M. T., Colmenares, A., Lee, A. C., Shen, G., Chariton, S., Prakapenka, V. B., Gu, X. 2022; 597
  • High pressure deformation induced precipitation in Al-Zn-Mg-Cu alloy (Al7075) MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Parakh, A., Lee, A. C., Chariton, S., Wang, M. M., Kiani, M. T., Prakapenka, V. B., Gu, X. 2022; 853
  • Ultrafine-grained Ni-rich layered cathode for advanced Li-ion batteries ENERGY & ENVIRONMENTAL SCIENCE Park, G., Yoon, D., Kim, U., Namkoong, B., Lee, J., Wang, M. M., Lee, A. C., Gu, X., Chueh, W. C., Yoon, C. S., Sun, Y. 2021

    View details for DOI 10.1039/d1ee02898g

    View details for Web of Science ID 000721948000001

  • Thermal enhancement and shape stabilization of a phase-change energy-storage material via copper nanowire aerogel CHEMICAL ENGINEERING JOURNAL Zhang, L., An, L., Wang, Y., Lee, A., Schuman, Y., Ural, A., Fleischer, A. S., Feng, G. 2019; 373: 857–69