People - Zhiyong Li

Zhiyong Li

E-mail: zhiyong.li@hp.com

Location:
Quantum Structures Research Department
Hewlett-Packard Laboratories
Palo Alto, California

Biography:
Zhiyong Li is a research scientist at QSR group in HP Labs, Palo Alto. Before joining HP in 2001, Zhiyong was a postdoctoral fellow with Bristol-Myers Squibb Company.  Zhiyong graduated with a PhD degree in Chemistry from University of Notre Dame, 2001, a MS degree in Inorganic Materials from Chinese Academy of Science, 1996, and a BS degree in Chemistry from University of Science and Technology of China, 1993.

Zhiyong is one of the nanotechnologists in HP actively seeking long term applications of nanoscale materials and devices, in particular, nanoscale chemical and biological sensors, molecular-scale memory and logic devices, nano plasmonics enhanced spectroscopy technology:

• Due to the extreme large surface to volume ratio in nanoscale structures, the electronic properties of the nanostructure, particularly semiconducting nanowires, will be very sensitive to surface species. For instance, by immobilizing single strand DNA molecules on silicon nanowires, the nanowires can be rendered very sensitive to the presence of the complimentary DNA molecules in solution, therefore nanoscale DNA sensor can be achieved with high sensitivity. This research can provide the foundation for label-free bio-detection which has broad applications in bio-research, environmental monitoring and homeland security.
• As silicon based electronics approaching its physical limit for miniaturization, exploring future generation electronic devices and circuits based on novel materials and fabrication methods is of extreme urgency. One promising direction is to use molecules as functional components for memory and logic applications. Fundamental issues such as screening functional materials, molecule-metal interfacial chemistry and electronic physics, nanofabrication in molecular scale are actively under investigation in this lab.
• Surface plasmonic structure offers a novel way to study enhanced spectra of molecules, such as nano-enhanced Raman scattering, which could ultimately resolve single molecule spectroscopy. Nano-engineering and the integration with photonic devices are investigated for novel chemical analytical tools on a miniaturized platform.

Zhiyong is a member of American Chemical Society, Material Research Society, and a founding member of Society of Porphyrins and Phthalocyanines.

Publications:

T. I. Kamins, S. Sharma, A. A. Yasseri, Z. Li, J. Straznicky, “Metal-catalysed, bridging nanowires as vapour sensors and concept for their use in a sensor system”, Nanotechnology, 2006, 17, S291-297

G.Y. Jung, E. Johnston-Halperin, W. Wu, Z. Yu, S.Y. Wang, W. M. Tong, Z. Li, J.E. Green, B.A. Sheriff, A. Boukai, Y. Bunimovich, J.R. Heath and R.S. Williams, , “Circuit fabrication at 17 nm half-pitch by nanoimprint lithography”, Nano Letters, 2006, 6, 351-354

A. Yasseri, S. Sharma, T. I. Kamins, Z. Li, R. S. Williams, “Growth and use of metal nanocrystal assemblies on high-density silicon nanowires formed by chemical vapor deposition”, Appl. Phys. A., 2006, 82, 659-664

K. Nauka, Z. Li, T. I. Kamins, “Surface photovoltage in silicon, novel applications for chemical and biological sensing”, Materials Science-Poland, 2005, 23, 653-661

G.-Y. Jung, Z. Li, W. Wu, S. Ganapathiappan, X. Li, D. L. Olynick, S. Y. Wang, W. M. Tong, and R. S. Williams, “Improved Pattern Transfer in Nanoimprint Lithography at 30 nm Half-Pitch by Substrate-Surface Functionalization”, Langmuir 2005, 21, 6127-6130

H. Ge, W. Wu, Z. Li, G.-Y. Jung, D. Olynick, Y. Chen, J. A. Liddle, S.-Y. Wang, and R. S. Williams, “Cross-linked Polymer Replica of a Nanoimprint Mold at 30 nm Half-pitch”, Nano Letters, 2005, 5, 179-182

G.-Y. Jung, Z. Li, W. Wu, Y. Chen, D. L. Olynick, S.-Y. Wang, W. M. Tong, and R. S. Williams, “Vapor-Phase Self-Assembled Monolayer for Improved Mold Release in Nanoimprint Lithography”, Langmuir 2005, 21, 1158-1161

Z. Li, B. Rajendran, T. I. Kamins, X. Li, Y. Chen, R. S. Williams, “Silicon nanowires for sequence-specific DNA sensing: device fabrication and simulation”, Appl. Phys. A., 2005, 80, 1257-1263

J. J. Blackstock, D. R. Stewart, Z. Li, “Plasma-produced ultra-thin platinum-oxide films for nanoelectronics: physical characterization”, Appl. Phys. A., 2005, 80, 1343-1353

W. Wu, G-Y. Jung, D. L. Olynick, J. Straznicky, Z. Li, X. Li, D. A. A. Ohlberg, Y. Chen, S. Y. Wang, J. A. Liddle, W. M. Tong, R. S. Williams, “One-killobit cross-bar molecular memory circuits at 30nm half-pitch fabricated by nanoimprint lithography”, Appl. Phys. A., 2005, 80, 1173-1178

Z. Li, Y. Chen, X. Li, T. Kamins, K. Nauka, R. S. Williams, “Sequence-specific label-free DNA sensors based on silicon nanowires”, Nano Letters, 2004, 4, 245.

J. J. Blackstock, Z. Li and G.-Y. Jung, “Template stripping using cold welding”, J. Vac. Sci. Technol. A, 2004, 22, 602-605

Z. Li, Y. Chen, X. Li, T. Kamins, K. Nauka, R. S. Williams, “Sequence-specific DNA sensors based on silicon nanowires” SPIE Conference on Nano-Sensors: Material and Devices, Optics East. October 24-28, 2004

Z. Li, T. I. Kamins, X. Li, and R. S. Williams, “Chlorination of Si Surface with Gaseous Hydrogen Chloride at Elevated Temperature”, Surf. Sci., 2004, 554, L81.

J. J. Blackstock, Z. Li, M. R. Freeman, D. R. Stewart, “Ultra-flat Platinum Surfaces from Template-stripping of Sputter Deposited Films”, Surf. Sci., 2003, 546, 87-96.

S.-C. Chang, Z. Li, J. Lau, B. Larade, R. S. Williams, “Investigation of a Model Molecular-Electronic Rectifier with an Evaporated Ti -Metal Top Contact”, Appl. Phys. Lett., 2003, 83, 3198-3200.

Z. Li, S.-C. Chang, and R. S. Williams, “Self-Assembly of Alkanethiol Molecules onto Platinum and Platinum Oxide Surfaces”, Langmuir, 2003, 19, 6744-6749.

Z. Li, P. Beck, D. A. A. Ohlberg, D. R. Stewart and R. S. Williams: "Surface properties of platinum thin films as a function of plasma treatment conditions," Surf. Sci. 2003, 529, 410-18.

Z. Li, M. Lieberman and W. Hill, “XPS and SERS Study of Silicon Phthalocyanine Monolayer on Gold Surface”, Langmuir, 2001, 17, 4887-4894.

Z. Li, M. Lieberman, “Axial Reactivity of Silicon(IV) Phthalocyanines”, Inorg. Chem., 2001, 40, 932-939.

Z. Li and M. Lieberman, “Thiol-modified Phthalocyanines and Their Self-Assembled Monolayers on Gold Surfaces”, p24-35 in Fundamental and Applied Aspects of Chemically Modified Surfaces, Jonathan P. Blitz and Charles B. Little ed., Royal Society of Chemistry, 1999.

Z. Wang, Z. Li, X. Chen and X. Hu, “X-ray Photoelectron Spectroscopy Study on Electrochromic V₂O₅ Thin Film”, Acta Physica Sinica, 1999, 8, 57-62.

Z. Li and M. Lieberman, “Synthesis and Characterization of Functionalized Silicon Phthalocyanines for Fabrication of Self-Assembled Monolayers”, Supramolecular Science, 1998, 5, 485-489.

X. Hu, X. Chen, Z. Li, L. Gao and D. Yan, “Laminated all-solid state NiO/WO₃ complementary electrochromic device”, Science in China (Series E), 1997, 40, 513-517.

X. Hu, X. Chen and Z. Li, “An all-solid state electrochromic device with NiO/WO₃ complementary device”, Proc. SPIE, 1997, vol. 3138, 58-63.

X. Chen, X. Hu, Z. Li, J. Tian, “The Laminated All-Solid-State Electrochromic Devices Using PEG-LiClO4 Gel Electrolyte”, Journal of Inorganic Materials, 1997, 12, 623-626.

Z. Li, X. Chen and X. Hu, “The Preparation and Ionic Conductance of Nano-amorphous LixTaOy Thin Film”, Journal of Physics D: Applied Physics, 1996, 29, 2740-2744.

Z. Li, Z. Li, X. Hu, M. Ruan, “Electron Beam Radiation Induced Poly-crystallization of ITO Film”, Journal of Inorganic Materials, 1996, 11, 137-140

Patents:

“Optically modulable photonic bandgap medium”, US7050659 B1, 2006

“Custom electrodes for molecular memory and logic devices” US6855647 B2, 2005

“Nano optical sensors via molecular self-assembly”, US6815706 B2, 2004