1. K-State home
  2. »Chemistry
  3. »People
  4. »Dr. Jun Li
  5. »Li Research Laboratory

The Li Research Laboratory

Jun Li Research Lab
Kansas State University
Department of Chemistry
427 CBC Building
1212 Mid-Campus Drive North
Manhattan, KS 66506

Phone Numbers
Office: 785-532-0955
Lab: 785-532-6979
Fax: 785-532-6666
Email: junli@ksu.edu

Research Overview

Research in the Li laboratory is in the interdisciplinary field of nanoscience and nanotechnology, with an emphasis on the development of novel applications of micro-/nano- devices in chemical/biochemical analysis, biomedicine, energy conversion and storage, environmental monitoring and protection, and electronics. Our foci are the fundamental understanding of new phenomena involved in nanomaterials growth/assembly, characterization, surface modification, and device fabrication/evaluation. The projects involve close collaboration with partners from academia, industry, and government labs. Current projects include: (a)Nanomaterials growth: mainly focused on high-aspect ratio nanofibers including carbon nanotubes (CNTs), carbon nanofibers (CNFs), semiconducting inorganic crystalline nanowires, and core-shell nanowires; (b)Biosensor development: mainly focused on embedded nanoelectrode arrays based on vertically aligned CNFs for electrochemical detection of proteases activity and nanoscale dielectrophoretic capture and detection of  virus and bacteria; (c)Energy conversion and storage: mainly focused on developing a 3D architecture based on vertical core-shell nanowire arrays for dye-sensitized solar cells, lithium-ion battery, and supercapacitors. 

Research Overview

research overview

Nanomaterials Growth

Our nanomaterials synthesis work is focused on preparing high-aspect ratio nanowires (NWs). A major effort is on exploring new methods to grow nanowires deterministically on solid substrates with controlled diameter, length, and orientation (particularly in free-standing vertical orientation) for device applications. The nanowire materials include carbon nanotubes (CNTs), carbon nanofibers (CNFs), semiconducting inorganic crystalline nanowires (s-NWs), and metallic nanowires (m-NWs). The methods include thermal chemical vapor deposition (CVD), plasma enhanced chemical vapor deposition (PECVD), and electrochemical deposition. Another effort is on large-quantity synthesis of NWs with hydrothermal method. NW materials such as ZnO, Bi2Te3, MnO2, etc. have been prepared for various applications.

Figure 1

Device Fabrication/Characterization

We employ conventional solid-state micro-/nano- fabrication techniques including lithography, CVD/PVD, plasma and wet chemical etching, sputtering, and chemical mechanical polishing. In addition, nonconventional methods such as soft-lithography, imprinting, templating, electrochemical etching/deposition, and chemical functionalization are investigated. Most fabrication processes employ a bottom-up method using massive arrays of vertically aligned CNTs and NWs on patterned substrates. The electronic, physical, and chemical properties and device performance are studied with electrochemistry, I-V measurements, optical spectroscopy, electron microscopy, and scanning probe microscopy. For biomaterials and biomedical devices, experiments involving molecular biochemistry, cell/tissue culture, and in-vivo animal experiments are carried in our lab or through collaborations.

 

 

 

Fig. 4 Nanostructured Li-ion battery electrodes

Nanostructured Li-ion Battery