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John Alper
Ph.D. Student

B.S., Chemical Engineering, University of Rhode Island (2008)
M.S., Chemical Engineering, University of California, Berkeley (2010)

E-mail:


john.alper (at) berkeley.edu


Contact Information:

Office Location: B78 Tan Hall
Office Telephone: 643-3489
Office Fax: 643-1228

 Research:
My research interests are broadly centered around the synthesis and application of semiconductor nanowires in energy storage. Specific topics include:
  • Synthesis and passivation of porous silicon nanowires for supercapacitor electrodes.
  • Fundamental study of metal catalyzed chemical vapor deposition based synthesis of silicon carbide nanowires - effect of processing parameters on growth process and resulting wire properties.
  • Synthesis of CVD based semiconducting nanowire-carbon hybrids with good electronic contact: improved performance and ease of device integration.
Recent Publications:
J. P. Alper, A. Gutés, C. Carraro, and R. Maboudian, "Semiconductor Nanowires Directly Grown on Graphene – Towards Wafer Scale Transferable Nanowire Arrays with Improved Electrical Contact", Nanoscale, DOI:10.1039/C3NR00367A

J. P. Alper, M. S. Kim, M. Vincent, B. Hsia, V. Radmilovic, C. Carraro, and R. Maboudian, “Silicon Carbide Nanowires as Highly Robust Electrodes for Microsupercapacitor Applications”, Journal of Power Sources, 230, 298–302 (2013).

J. P. Alper, M. Vincent, C. Carraro, and R. Maboudian, “Silicon Carbide Coated Silicon Nanowires as Robust Electrode Material for Aqueous Supercapacitor”, Applied Physics Letters, 100, 163901 (2012).

Recent Presentations:
J. P. Alper, A. Gutés, C. Carraro, and R. Maboudian, "Semiconducting Nanowire Arrays Grown Directly on Graphene: Towards Precision Placement of Wafer Scale Nanowire Arrays with Improved Electrical Contact for Energy Storage and Harvesting," IEEE CPMT Technical Meeting, Santa Clara, CA - Oral Presentation (Sept. 2013).

J. P. Alper, M. S. Kim, B. Hsia, M. Vincent, C. Carraro, and R. Maboudian, "Silicon Carbide Nanowire Arrays: Towards Robust High Power Energy Storage for Implementation in Mobile Electronics," Materials Research Society Spring Meeting, San Francisco, CA - Oral Presentation (2013).

J. P. Alper, M. Vincent, C. Carraro, and R. Maboudian, "Silicon Carbide Nanostructures for Micro-Supercapacitor Applications," American Vacuum Society 59th International Symposium and Exhibition, Tampa, FL - Oral Presentation (2012).

J. P. Alper, M. Vincent, C. Carraro, and R. Maboudian, "Development of On-Chip Silicon Nanowire Based Micro-Supercapacitor Electrodes," Materials Research Society Spring Meeting, San Francisco, CA - Oral Presentation (2012).

J. P. Alper, M. Vincent, C. Carraro, and R. Maboudian, "Development of Silicon Based Nanomaterials for On-Chip Supercapacitor Applications," Workshop for Technologies for Future Micro and Nano Manufacturing, Napa, CA - Poster Presentation (2011).

Awards:
IEEE Components, Packaging and Manufacturing Technology Society Graduate Student Grant

ARKEMA Industrial Graduate Fellowship

Second Place Finish - Science as Art Competition, MRS Spring 2013 Technical Meeting, San Francisco

"On the Beach Alone, at Night"
A composite of three scanning electron microscope images taken at different focal lengths of a silicon nanowire array synthesized via wet chemical etching of bulk silicon. The chemistry is "self-assembling" in that the silicon surrounding the nanowires is spontaneously etched under the right conditions. The images were captured using a NovelX mySEM low voltage scanning electron microscope. The near and far range images were taken with standard backscatter collection while the middle range image was taken using the Topo mode in order to capture the relief of the silicon "dunes." The three images were combined and colorized in Photoshop.