Junhong Chen - Professor

Education

Ph.D. - Mechanical Engineering, University of Minnesota, Minneapolis, MN, 2002
M.S. - Mechanical Engineering, University of Minnesota, Minneapolis, MN, 2000
B.E. - Thermal Engineering, Tongji University, Shanghai, China, 1995

Postdoctoral Research

Chemical Engineering, California Institute of Technology, Pasadena, CA, 2002-2003

Research Interests

Nanoparticle synthesis, assembly, and nanofabrication; energy conversion, storage, and conservation; nanostructure-based gas sensors, biosensors, and water sensors; carbon nanotubes, graphene, and hybrid nanomaterials; pollution control; and corona discharges and plasma reacting flows.

Selected Publications

Synthesis and Assembly of Novel Hybrid Nanomaterials

1. J. H. Chen and G. H. Lu, "Controlled Decoration of Carbon Nanotubes with Nanoparticles," Nanotechnology 17(12), 2891-2894, 2006.  (Highlighted by Nanowerk Spotlight, http://www.nanowerk.com/spotlight/spotid=545.php)
2. G. H. Lu, L. Y. Zhu, P. X. Wang, J. H. Chen, D. A. Dikin, R. S. Ruoff, Y. Yu, and Z. F. Ren, "Electrostatic Force Directed Assembly of Ag Nanocrystals onto Vertically Aligned Carbon Nanotubes," Richard E. Smalley Memorial Issue of J. Phys. Chem. C., 111(48), 17919-17922, 2007.
3. L. Y. Zhu, G. H. Lu, S. Mao, J. H. Chen, D. A. Dikin, X. Q. Chen, and R. S. Ruoff, "Ripening of Silver Nanoparticles on Carbon Nanotubes," NANO 2(3), 149-156, 2007.  (Featured Cover Article)
4. S. Mao, G. H. Lu, and J. H. Chen, "Coating Carbon Nanotubes with Colloidal Nanocrystals by Combining an Electrospray Technique with Directed Assembly by an Electrostatic Field," Nanotechnology 19(45), No. 455610, 2008.
5. G. H. Lu, S. Mao, S. Park, R. S. Ruoff, and J. H. Chen, "Facile, Noncovalent Decoration of Graphene Oxide Sheets with Nanocrystals," Nano Research 2(3), 192-200, 2009.
6. S. Mao, Z. H. Wen, Haejune Kim, G. H. Lu, P. Hurley, and J. H. Chen*, "A General Approach to One-Pot Fabrication of Crumpled Graphene-Based Nanohybrids for Energy Applications," ACS Nano 6(8), 7505-7513, 2012.

Design and Fabrication of Chemical and Biological Sensors/Sensor Arrays

7. G. H. Lu, L. E. Ocola, and J. H. Chen, "Room-Temperature Gas Sensing through Electronic Transfer between Discrete Tin Oxide Nanocrystal and Multiwalled Carbon Nanotube," Advanced Materials 21(24), 2487-2491, 2009. (Featured as Frontispiece)
8. G. H. Lu, L. E. Ocola, and J. H. Chen, "Gas Detection Using Low-Temperature Reduced Graphene Oxide Sheets," Applied Physics Letters 94(8), No. 083111, 2009. Selected for the March 16, 2009 issue of Virtual Journal of Nanoscale Science & Technology.
9. S. Mao, G. H. Lu, K. H. Yu, Z. Bo, and J. H. Chen*, "Specific Protein Detection using Thermally Reduced Graphene Oxide Sheet Decorated with Gold Nanoparticle-antibody Conjugates," Advanced Materials 22(32), 3521-3526, 2010.
10. G. H. Lu, S. Park, K. H. Yu, R. S. Ruoff, L. E. Ocola, D. Rosenmann, and J. H. Chen*, "Toward Practical Gas Sensing Using Highly Reduced Graphene Oxide: A New Signal Processing Method to Circumvent Run-to-Run and Device-to-Device Variations," ACS Nano 5(2), 1154-1164, 2011.
11. G. H. Lu, K. H. Yu, L. E. Ocola, and J. H. Chen*, "Ultrafast Room-Temperature NH3 Sensing with Positively-Gated Reduced Graphene Oxide Field-Effect Transistors," Chemical Communications 47(27), 7761-7763, 2011.
12. K. H. Chen, G. H. Lu, J. B. Chang, S. Mao, K. H. Yu, S. M. Cui, and J. H. Chen*, "Rapid Hg(II) Ion Detection Using Thermally Reduced Graphene Oxide Decorated with Functionalized Gold Nanoparticles," Analytical Chemistry 84(9), 4057-4062, 2012.

Novel Photovoltaic Cells based on Hybrid Nanostructures

13. K. H. Yu and J. H. Chen, "Enhancing Solar Cell Efficiencies through 1-D Nanostructures," Nanoscale Research Letters 4(1), 1-10, 2009.
14. Z. H. Wen, S. M. Cui,H. H. Pu, S. Mao, K. H. Yu, X. L. Feng*, and J. H. Chen*, "Metal Nitride/Graphene Nanohybrids: General Synthesis and Multifunctional Titanium Nitride/Graphene Electrocatalyst," Advanced Materials 23(45), 5445-5450, 2011.
15. K. H. Yu, G. H. Lu, S. Mao, H. Kim, and J. H. Chen*, "Selective Deposition of CdSe Nanoparticles on Reduced Graphene Oxide to Understand Photoinduced Charge Transfer in Hybrid Nanostructures," ACS Applied Materials & Interfaces 3(7), 2703-2709, 2011.
16. K. H. Yu, G. H. Lu, Z. Bo, S. Mao, and J. H. Chen*, "Carbon Nanotube with Chemically-bonded Graphene Leaves for Electronic and Optoelectronic Applications," The Journal of Physical Chemistry Letters 2(13), 1556-1562, 2011.
17. K. H. Yu, X. Lin, G. H. Lu, Z. H. Wen, C. Yuan*, and J. H. Chen*, "Optimizing CdS Quantum Dot Sensitized Solar Cell Performance through Atomic Layer Deposition of Ultrathin TiO2 Coating," RSC Advances 2(20), 7843-7848, 2012.
18. K. H. Yu, G. H. Lu, Z. H. Wen, H. J. Kim, Y. Y. Qian, E. Andrew, S. Mao, and J. H. Chen*, "Hierarchical Vertically-Oriented Graphene as a Catalytic Counter Electrode in Dye-Sensitized Solar Cells," Accepted to Journal of Materials Chemistry A.

High-Performance Energy Storage Devices

19. S. Mao, Z. H. Wen, Haejune Kim, G. H. Lu, P. Hurley, and J. H. Chen*, "A General Approach to One-Pot Fabrication of Crumpled Graphene-Based Nanohybrids for Energy Applications," ACS Nano 6(8), 7505-7513, 2012.
20. Z. H. Wen, X. C. Wang, S. Mao, Z. Bo, H. Kim, S. M. Cui, G. H. Lu, X. L. Feng*, and J. H. Chen*, "Crumpled Nitrogen-Doped Graphene Nanosheets with Ultrahigh Pore Volume for High-performance Supercapacitor," Advanced Materials 24(41), 5610-5616, 2012.
21. H. J. Kim, Z. H. Wen, K. H. Yu, O. Mao, and J. H. Chen*, "Straightforward Fabrication of Highly Branched Graphene Nanosheet Array for Li-ion Battery Anode," Journal of Materials Chemistry 22(31), 15514-15518, 2012.
22. Z. Bo, S. Mao, K. H. Yu, S. M. Cui, and J. H. Chen*, "One-step Fabrication and Capacitive Behavior of Electrochemical Double Layer Capacitor Electrodes Using Vertically-oriented Graphene Directly Grown on Metal," Carbon 50(12), 4379-4387, 2012.
23. Z. H. Wen, S. M. Cui, H. J. Kim, S. Mao, K. H. Yu, G. H. Lu, H. H. Pu, O. Mao, and J. H. Chen*, "Binding Sn-Based Nanoparticles on Graphene as Anode of Lithium Ions Batteries," Journal of Materials Chemistry 22(8), 3300-3306, 2012.

Pollution Control in Water and Air

24. W. Smith*, S. Mao, G. H. Lu, A. Catlett, J. H. Chen*, and Y. P. Zhao, "The Effect of Ag Nanoparticle Loading on the Photocatalytic Activity of TiO2 Nanorod Arrays," Chemical Physics Letters 485(1-3), 171-175, 2010.
25. Z. Bo, K. H. Yu, G. H. Lu, S. Mao, J. H. Chen*, and F. G. Fan, "Nanoscale Discharge Electrode for Minimizing Ozone Emission from Indoor Corona Devices," Environmental Science & Technology 44(16), 6337-6342, 2010.
26. Z. Bo, K. H. Yu, G. H. Lu, S. M. Cui, S. Mao, and J. H. Chen*, "Vertically-oriented Graphene Sheets Grown on Metallic Wires for Greener Corona Discharges: Lower Power Consumption and Minimized Ozone Emission," Energy & Environmental Science 4(7), 2525-2528, 2011.
27. Z. H. Wen, S. Q. Ci, F. Zhang, X. L. Feng, S. M. Cui, S. Mao, S. L. Luo, and Z. He*, and J. H. Chen*, "Nitrogen-Enriched Core-Shell Structured Fe/Fe3C-C Nanorods as Advanced Catalysts for Oxygen Reduction Reaction," Advanced Materials 24(11), 1399-1404, 2012.
28. J. Ma*, J. H. Chen*, F. Yu, Z. W. Yuan, and L. L. Yu, "A Facile One-pot Method for Low-cost Synthesis of Magnetic Carbon Nanotubes and Their Applications for Dye Removal," New Journal of Chemistry, 36(10), 1940-1943, 2012.
29. F. Yu, J. H. Chen*, L. Chen, J. Huai, W. Y. Gong, Z. W. Yuan, J. H. Wang, and J. Ma*, "Magnetic Carbon Nanotubes Synthesis by Fenton's Reagent Method and Their Potential Application for Removal of Azo Dye from Aqueous Solution," Journal of Colloid and Interface Science 378(1), 175-183, 2012.

Emerging Nanomaterials and Their Applications

30. K. H. Yu, Z. Bo, G. H. Lu, S. Mao, S. M. Cui, Y. W. Zhu, X. Q. Chen, R. S. Ruoff, and J. H. Chen*, "Growth of Carbon Nanowalls at Atmospheric Pressure for One-step Gas Sensor Fabrication," Nanoscale Research Letters 6:202, 2011.
31. Z. Bo, K. H. Yu, G. H. Lu, S. Mao, and J. H. Chen*, "Understanding Growth of Carbon Nanowalls at Atmospheric Pressure Using Normal Glow Discharge Plasma-enhanced Chemical Vapor Deposition," Carbon 49(6), 1849-1858, 2011.
32. K. H. Yu, P. X. Wang, G. H. Lu, K. H. Chen, Z. Bo, and J. H. Chen*, "Patterning Vertically Oriented Graphene Sheets for Nanodevice Applications," The Journal of Physical Chemistry Letters 2(6), 537-542, 2011.
33. K. H. Yu, G. H. Lu, Z. Bo, S. Mao, and J. H. Chen*, "Carbon Nanotube with Chemically-bonded Graphene Leaves for Electronic and Optoelectronic Applications," The Journal of Physical Chemistry Letters 2(13), 1556-1562, 2011.
34. Z. Bo, S. M. Cui, K. H. Yu, G. H. Lu, S. Mao, and J. H. Chen*, "Uniform Growth of Few-layer Graphene Vertically Standing on Cylindrical Surface at Atmospheric Pressure," Review of Scientific Instruments 82(8), 086116, 2011.
35. S. Mao, Z. H. Wen, Haejune Kim, G. H. Lu, P. Hurley, and J. H. Chen*, "A General Approach to One-Pot Fabrication of Crumpled Graphene-Based Nanohybrids for Energy Applications," ACS Nano 6(8), 7505-7513, 2012.