Dr. Tony E. Karam

Ph.D. Chemical Physics 2016
         Louisiana State University

M.S. Chemical Physics 2011
       American University of Beirut

B.S. Chemistry 2008
       Saint Joseph’s University

Research Interests

Ultrafast Electron Diffraction

Investigations into the interactions between light and matter at the ultrafast time scale are essential for the design and optimization of highly efficient nanomaterials. Recent advances in nanomaterial fabrication techniques have led to the design of numerous samples with exciting new properties and advanced performances. Solid-state nanomaterials and 2D semiconductors provide novel, sustainable and cost-effective alternatives for various applications such as photovoltaics, optoelectronics, and quantum computing. Despite the extensive theoretical and experimental studies of such materials due to their potential applications, several ultrafast processes such as structural rearrangement, lattice vibrations, and phase transitions that limit their efficiencies remain poorly understood.Ultrafast electron diffraction (UED) provides unique windows into the correlated atomic motions, bond dilation, and structural transformation of various materials on the time scale of nuclear motion by recording the transient non-equilibrium diffraction patterns with ultrafast temporal resolution following laser excitation. Using UED, paradigms that correlate structure, dynamics, and functionality can be established, leading to a full understanding of light-matter interactions. My current research focuses on the use of UED to investigate the transient structural dynamics of atomically-thin samples and 2D materials. These experiments will allow for a new level of control and understanding of properties of matter that will drive the improvement and design of advanced materials for various technological applications.

Selected Publications

  • Karam, T. E. Siraj, N.; Warner, I. M.; Haber, L. H. Anomalous Size-Dependent Excited-State Relaxation Dynamics of NanoGUMBOS. J. Phys. Chem. C, 2015, 119, 28206–28213

  • Karam, T. E. Khoury, R. A.; Haber, L. H. Excited-State Dynamics of Size-Dependent Colloidal TiO2-Au Nanocomposites J. Chem. Phys., 2016, 144, 124704.

  • Karam, T. E. Smith, H. T.; Haber, L. H. Enhanced Photothermal Effects and Excited-State Dynamics of Plasmonic Size-Controlled Gold–Silver–Gold Core–Shell–Shell Nanoparticles J. Phys. Chem. C, 2015, 119, 18573–18580

  • Karam, T. E. Haber, L. H. Molecular Adsorption and Resonance Coupling at the Colloidal Gold Nanoparticle Interface J. Phys. Chem. C, 2014, 118, 642–649.