Computational Chemistry and Nano Materials
Associate Professor of Chemistry
B.S. Shandong University
Ph.D. Emory University
- Energy transfer between dye, quantum dot and metal nanoaprticles.
Using electrodynamics theory, we model the energy transfer between dye molecules or quantum dots when they are placed near one or multiple nanoparticles. The intensity and life change of the emitter when it is placed near a metal nanocluster can be calculated. Both the single and multiple excitons process can be modeled.
Fig. 1 Schematic of the energy transfer between a dye or a quantum dot placed near a metal nanoparticle.
Figure 2. Experimentally measured and theoretically calculated fluorescence signal versus the distance between the dye molecules and Au nanoparticle surfaces.
- Surface enhanced Raman scattering.
Quantitative agreement between the experimental measurement and theoretical calculations for the surface enhanced Raman scattering was obtained.
Figure 3. Experimentally measured and theoretically calculated enhancement factors of Raman scattering.
- Optical properties of metal nanoparticles and particle arrays and films with periodic structures.
Using electrodynamics theory, we predict novel optical properties of metal nano clusters or particles arranged in a periodic arrays.
Figure 4. Complete light trapping using a two layer silver film with a thickness of 100 nm. (Left) Schematic of the film. (Middle) Electric field distribution between the two layers. (Right) Absorption efficiency between wavelengths of 300-800 nm. The simulations can be used to design solar cells with reduced dimension and improved efficiency.
Figure 5. Theoretical demonstration of efficient light propagation through a 50 nm wide tunnel with multiple sharp 90 degree turns. The calculations showed efficient light propagation after four sharp 90 degree turns and are useful for the design of optical waveguide devices.
Figure 7. Far field photon intensity enhancement using an array of silver nanoparticles. (Left) Schematic of the structure and principle of the far field photon enhancement. (Right) Numerical results showing the enhanced far field intensity using a silver nanoparticle array. Combining two coherent light rays is technically challenging. We demonstrated that combing multiple coherent rays is possible by using metal nanoparticle array with excited quadrupole mode.
CHM3422 (Applied Physical Chemistry)
CHM3411 (Physical Chemistry II)
CH6240 (Chemical Thermodynamics)
“An experimental and theoretical mechanistic study of biexciton quantum yield enhancement in single quantum dots near gold nanoparticles” Swayandipta Dey, Yadong Zhou, Xiangdong Tian, Julie A. Jenkins, Ou Chen, Shengli Zou, Jing Zhao, Nanoscale (2015) 7(15), 6851-6858
“A numerical demonstration of far field photon intensity enhancement without stimulated emission” Patricia Gomez, Jennifer M. Reed, Haining Wang, and Shengli Zou, Chemical Physics Letters (2014) 616, 243-247
“A generalized electrodynamics model for surface enhanced Raman scattering and enhanced/ quenched fluorescence calculations” Haining Wang, Shengli Zou, RSC. Adv. (2013) 3(44) 21489-21493
“Efficient and tunable light trapping thin films” Feng Yu, Haining Wang, and Shengli Zou, J. Phys. Chem. C (2010) 114(5) 2066-2069
“Controlling the Shape, Orientation and Pitch of Carbon Nanotube Features Using Nano Affinity Templates” Yuhuang Wang, Daniel Maspoch, Shengli Zou, George C. Schatz, Richard E. Smalley, Chad A. Mirkin, Proc Nat Acad Sci, USA (2006) 103,2026-2031
“Silver nanoparticle array structures that produce giant enhancements in electromagnetic fields” Shengli Zou and George C. Schatz, Chem. Phys. Lett, (2005) 403(1-3) 62-67.
“Finding sharp extinction peak in one and two dimensional silver nanoparticle arrays”, Shengli Zou, Nicolas Janel, George C. Schatz, J. Chem. Phys., (2004) 120, 10871-10875.
” Full dimensionality quantum calculations of acetylene/vinylidene isomerization” Shengli Zou, and Joel M. Bowman J. Chem. Phys. (2002) 117 (12): 5507-5510