@article{neupane_chase_zhao_wang_he_2021, title={Optical properties of segmented Ag-Au wire at single particle level studied with a home-built micro-spectrometer}, ISSN={["2577-8196"]}, DOI={10.1002/eng2.12439}, abstractNote={Abstract}, journal={ENGINEERING REPORTS}, author={Neupane, Bhanu B. and Chase, Thomas E. and Zhao, Luyang and Wang, Gufeng and He, Lin}, year={2021}, month={Jul} }
 @article{zhong_zhao_tyrlik_wang_2017, title={Investigating Diffusing on Highly Curved Water-Oil Interface Using Three-Dimensional Single Particle Tracking}, volume={121}, ISSN={["1932-7447"]}, DOI={10.1021/acs.jpcc.7b01721}, abstractNote={Diffusion on highly curved surfaces is important to many industrial and biological processes. Despite the progress made in theoretical studies, how diffusion is affected by the curvature is unclear due to experimental challenges. Here, we measured the trajectories of polystyrene nanoparticles diffusing on highly curved water-silicone oil interface, where the oil droplet diameter ranges from several μm to as small as ∼400 nm. To analyze the diffusion coefficients on curved surface, an analytical solution developed by Castro-Villarreal containing an infinite series can be used. Through Monte Carlo simulations, we simplified the Castro-Villarreal equation and defined the conditions that satisfy corresponding approximations. For the experiments, unexpectedly, we found that the diffusion slows down significantly when the oil droplet becomes smaller. Possible reasons were discussed, and a diffusion-induced droplet deformation and interface fluctuation model is consistent with the experimental results. This stud...}, number={14}, journal={JOURNAL OF PHYSICAL CHEMISTRY C}, author={Zhong, Yaning and Zhao, Luyang and Tyrlik, Paul M. and Wang, Gufeng}, year={2017}, month={Apr}, pages={8023–8032} }
 @article{zhao_zhong_wei_ortiz_chen_wang_2016, title={Microscopic Movement of Slow-Diffusing Nanoparticles in Cylindrical Nanopores Studied with Three-Dimensional Tracking}, volume={88}, ISSN={["1520-6882"]}, DOI={10.1021/acs.analchem.5b04944}, abstractNote={To study slow mass transport in confined environments, we developed a three-dimensional (3D) single-particle localization technique to track their microscopic movements in cylindrical nanopores. Under two model conditions, particles are retained much longer inside the pores: (1) increased solvent viscosity, which slows down the particle throughout the whole pore, and (2) increased pore wall affinity, which slows down the particle only at the wall. In viscous solvents, the particle steps decrease proportionally to the increment of the viscosity, leading to macroscopically slow diffusion. As a contrast, the particles in sticky pores are microscopically active by showing limited reduction of step sizes. A restricted diffusion mode, possibly caused by the heterogeneous environment in sticky pores, is the main reason for macroscopically slow diffusion. This study shows that it is possible to differentiate slow diffusion in confined environments caused by different mechanisms.}, number={10}, journal={ANALYTICAL CHEMISTRY}, author={Zhao, Luyang and Zhong, Yaning and Wei, Yanli and Ortiz, Nathalia and Chen, Fang and Wang, Gufeng}, year={2016}, month={May}, pages={5122–5130} }
 @article{gao_deng_yan_gao_wu_cai_ji_li_wu_jin_et al._2016, title={Single molecule targeted sequencing for cancer gene mutation detection}, volume={6}, journal={Scientific Reports}, author={Gao, Y. and Deng, L. W. and Yan, Q. and Gao, Y. Q. and Wu, Z. D. and Cai, J. S. and Ji, D. R. and Li, G. L. and Wu, P. and Jin, H. and et al.}, year={2016} }
 @article{neupane_zhao_wang_2013, title={Up-Conversion Luminescence of Gold Nanospheres When Excited at Nonsurface Plasmon Resonance Wavelength by a Continuous Wave Laser}, volume={13}, ISSN={["1530-6992"]}, DOI={10.1021/nl401505p}, abstractNote={We show that, when gold nanospheres are excited at the red side of the surface plasmon resonance (SPR) wavelength at 592 nm by a continuous wave (CW) laser, they give substantial up-converted luminescence in the SPR wavelength range. The luminescence intensity scales as a second-order function of the excitation power, with a quantum yield ~1/50 of down-conversion luminescence when illuminated at a power of 30 MW/cm(2). The luminescence spectrum is completely different than the SPR profile, indicating a new emission mechanism possibly involving interband transitions coupled with phonons or localized vibration of neighboring gold atoms. Such luminescence is also observed to be substantial for short gold nanorods with an aspect ratio of ~2 but weak for bulk gold. This study provides new insight to the understanding of gold nanoparticle luminescence and opens a new detection scheme for gold nanoparticle-based biological imaging.}, number={9}, journal={NANO LETTERS}, author={Neupane, Bhanu and Zhao, Luyang and Wang, Gufeng}, year={2013}, month={Sep}, pages={4087–4092} }