Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Nanomaterials Tuesday Sessions
       Session NM-TuE

Invited Paper NM-TuE1
High Spatial/Energy Resolution Cathodoluminescence Spectroscopy: Powerful Tool for Precise Characterization of Nanostructures

Tuesday, December 9, 2014, 5:40 pm, Room Hau

Session: Nanomaterials Characterization & Reactivity II
Presenter: Dapeng Yu, Peking University, China
Correspondent: Click to Email
Nanowires have been a top-five focused research topics in physics, and stimulated intensive interests world-wide. This talk composes of two major parts. In the first part, I will give a brief summary of our contributions to the world-wide nanowire research. In the main second part, I will extend to show the advantage of both high spatial and energy resolution cathodoluminescence (CL) in characterization of the fine structures of the nanomaterials. In particularly, I will demonstrate that the high special resolution of the CL at ~ 5.5 K enable us to address the significant strain modulation of the optical emission and electronic structures of semiconductor nano/micro wires[1-5]. In contrast, the high energy resolution of the CL makes it possible to “see” directly the resonant SPP modes that are confined to the metal nanocavity.

Jing G Y et al. Surface effects on elastic properties of silver nanowires: contact atomic-force microscopy[J]. Physical Review B, 2006, 73(23): 235409.

2] Han X B et al. Electronic and mechanical coupling in bent ZnO nanowires. Advanced Materials, 2009, 21(48): 4937-4941.

3] Han X B et al. Strain-Gradient Effect on Energy Bands in Bent ZnO Microwires. Advanced Materials, 2012, 24(34): 4707-4711.

4] Fu X W et al. Exciton Drift in Semiconductors under Uniform Strain Gradients: Application to Bent ZnO Microwires. ACS nano 8.4 (2014): 3412-3420.

/p>5] Fu X W et al. Tailoring Exciton Dynamics by Elastic Strain-Gradient in Semiconductors. Advanced Materials 26.16 (2014): 2572-2579.