Our researches mainly focus on the synthesis and characterizations of mesoporous and semiconductor materials with unique optical, electrical, magnetic and spintronic properties. Current research covers board topics of nano-material applications, including surface-enhanced Raman scattering (SERS), CO2 reduction reactions (CO2RR), diluted magnetic semiconductors (DMS) in fundamental aspects.
Heterostructured 1D Nanowire and 2D Nanosheets
Mesoporous Nanoparticles and Thin-Film Materials
Highlights
Single-crystalline CdSe(ethylenediamine)0.5 nanosheets with tunable Mn2+ (0.5-8.0%) are synthesized, showing strong phosphorescence (4T1→6A1) and long lifetimes (20.5, 132, 295 μs). Temperature-varied EPR spectroscopy with spectral simulation reveals anisotropic ZFS (D=3850 MHz) due to axial distortion of substituted Mn2+ (S=5/2). Additionally, giant Zeeman splitting with large effective g-values (up to 231±21) in magnetic circular dichroism (MCD) suggests quantum confinement, spin-orbital interaction and huge sp-d exchange interaction in 2D monolayer regimes.
2D Spintronics
EPR simulation for an S=5/2 spin system
Magneto-Optically Transitions in Fields
IN THE LAB
We grow “low-dimentional semiconductor” materials via colloidal syntheses. The materials includes magic-sized clusters, nanosheets, nanowires and vertical thin films on substrates that target to grow vertical superlattices of 1D and 2D semiconductors having strong quantum confinement effects (QCEs) for practical uses in nanotechnology.
The future world needs clean and facile energy suppliers which exclusively derive power from solar photon and heats. We focus on various environmental friendly elements, including Ag, Bi and Sn, and their compounds which can harvest the solar power into electricity for station uses and recycle excess waste heats for portable devices. Our works focus on syntheses and fundamental discovery of these tinny materials with efficient conversion yields originated from chip-based arrays, namely the superlattices, to achieve the goals.