Raman, Photoemission Electron Microscopy and Laser Desorption of Plasmonic Metal Nanostructures
and Hybrid Metal - Insulator Photoemitters
EMSL Project ID
49123
Abstract
The goal of this proposal is to measure structurally-dependent electronic bulk and surface dynamics of electrons, holes, and excitons, on different but well-characterized hybrid materials, using complimentary techniques. PEEM is capable of femtosecond time resolution, and uses highly versatile photoemission detection, but has limited spatial resolution (>10 nm). Laser desorption probes mechanistic details of excited state surface dynamics by probing kinetic energies of emitted atoms. Together, these interface specific and time- and spatially-resolved techniques provide a revealing window into the key dynamical factors of laser materials interactions. Our experimental measurements will focus on excited state dynamics on various hybrid metal-insulator structures and plasmonic metal nanostructures. To achieve femtosecond time resolution and nanometer spatial resolution, we will use time-resolved photoemission electron microscopy (TR-PEEM) and tip enhanced Raman spectroscopy (SERS). Furthermore, since surface defects have great impact on the chemical and material properties, it is revealing to study surfaces with different defect densities. Thin film samples with controllable surface and bulk defect densities will be produced using standard preparation techniques such as laser or particle activation.
Project Details
Start Date
2015-10-01
End Date
2018-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Bhattarai A., A.G. Joly, W.P. Hess, and P.Z. El-Khoury. 2017. "Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering." Nano Letters 17, no. 11:7131-7137. PNNL-SA-129323. doi:10.1021/acs.nanolett.7b04027
Bhattarai A., A.V. Krayev, A. Temiryazev, D. Evplov, K.T. Crampton, W.P. Hess, and P.Z. El-Khoury. 2018. "Tip-Enhanced Raman Scattering from Nanopatterned Graphene and Graphene Oxide." Nano Letters 18, no. 6:4029-4033. PNNL-SA-134494. doi:10.1021/acs.nanolett.8b01690
El-Khoury P Z,Abellan Baeza P ,Gong Y ,Hage F S,Cottom J ,Joly A G,Brydson R ,Ramasse Q M,Hess W P 2016. "Visualizing Surface Plasmons with Photons, Photoelectrons, and Electrons" Analyst 141():3562-3572. 10.1039/c6an00308g
El-Khoury PZ, AG Joly, and WP Hess. 2016. "Hyperspectral Dark Field Optical Microscopy of Single Silver Nanospheres." Journal of Physical Chemistry C 120(13):7295-7298. doi:10. 1021/acs. jpcc. 6b02401
El-Khoury PZ, GE Johnson, IV Novikova, Y Gong, AG Joly, JE Evans, M Zamkov, J Laskin, and WP Hess. 2015. "Enhanced Raman Scattering from Aromatic Dithiols Electrosprayed into Plasmonic Nanojunctions." Faraday Discussions 184:339-357. doi:10. 1039/C5FD00036J
El-Khoury PZ, P Abellan, RL Chantry, Y Gong, AG Joly, IV Novikova, JE Evans, E Apra, D Hu, QM Ramasse, and WP Hess. 2016. "The information content in single-molecule Raman nanoscopy." Advances in Physics: X 1(1):,
Fischer SA, E Apra, N Govind, WP Hess, and PZ El-Khoury. 2017. "Non-Equilibrium Chemical Effects in Single Molecule SERS Revealed by ab initio Molecular Dynamics Simulations." Journal of Physical Chemistry A 121(6):1344-1350. doi:10.1021/acs.jpca.6b12156
Fischer SA, TW Ueltschi, PZ El-Khoury, AL Mifflin, WP Hess, H Wang, CJ Cramer, and N Govind. 2016. "Infrared and Raman Spectroscopy from Ab Initio Molecular Dynamics and Static Normal Mode Analysis: The C-H Region of DMSO as a Case Study." Journal of Physical Chemistry B 120(8):1429-1436. doi:10.1021/acs.jpcb.5b03323
Gong Y, AG Joly, PZ El-Khoury, and WP Hess. 2016. "Enhanced Propagating Surface Plasmon Signal Detection." ACS Photonics 3(12):2413-2419. doi:10.1021/acsphotonics.6b00636
Gong Y., A.G. Joly, P.Z. El-Khoury, and W.P. Hess. 2016. "Enhanced Propagating Surface Plasmon Signal Detection." ACS Photonics 3, no. 12:2413-2419. PNNL-SA-121997. doi:10.1021/acsphotonics.6b00636
Gong Y, AG Joly, PZ El-Khoury, and WP Hess. 2017. "Polarization Directed Surface Plasmon Polariton Launching." Journal of Physical Chemistry Letters 8(1):49-54. doi:10.1021/acs.jpclett.6b02509
Gong Y, AG Joly, X Zhang, PZ El-Khoury, and WP Hess. 2017. "Surface Plasmon Coupling and Control using Spherical Cap Structures." Journal of Physical Chemistry Letters 8(12):2695-2699. doi:10.1021/acs.jpclett.7b00852
Halliday MT, WP Hess, and AL Shluger. 2016. "A mechanism of Cu work function reduction in CsBr/Cu photocathodes." Physical Chemistry Chemical Physics. PCCP 18(10):7427-7434. doi:10.1039/c5cp07694c
Ueltschi TW, SA Fischer, E Apra, AN Tarnovsky, N Govind, PZ El-Khoury, and WP Hess. 2016. "Time-Domain Simulations of Transient Species in Experimentally Relevant Environments." Journal of Physical Chemistry A 120(4):556-561. doi:10. 1021/acs. jpca. 5b11710