California NanoSystems Institute
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Qibing Pei, Ph.D.

Professor, Materials Science and Engineering
Member, California NanoSystems Institute

Ph.D., Chinese Academy of Sciences, 1990

Contact Information:
Email Address:
Office Address: 420 Westwood Plaza
Los Angeles, CA 90095
Home Page:
Fax Number: 310-206-7353
Work Phone Number: 310-825-4217
Research Interests:

Professor Pei is establishing a soft materials laboratory to study electronic polymers and related materials and devices. His laboratory focuses on molecular design and nano-scale engineering for the development of new polymers and nano-structures with desired electronic and/or mechanical properties. The applications of these materials are many folds, including organic displays, flexible electronics, artificial muscles, and biologically-inspired systems to name a few. For instances, conducting polymers undergo a small volume change when they are electrochemically or chemically oxidized, converting a portion of the input energy into mechanical work. Such energy transduction is attractive for constructing meso, micro, and even nanometer-size electromechanical devices. On the other hand, electroelastomers based on soft dielectric rubbery films exhibit electrically-induced strains as high as 400%. A number of actuators such as roll actuators (shown in the figure) have been fabricated to replace electric motors and gears. The advantages the soft actuators provide are quiet, compliant (thus shock resistant), high efficiency (compared to motors at small sizes), light weight, and low cost. The performance of the electroelastomers is comparable to natural muscles. One particularly attractive application is as the muscles in prosthetic, orthotic, and other biomimetic devices. Walking robots using a roll actuator as each of the robots' 6 leg were demonstrated to mimic cockroach and dog locomotion. A series of rolls were linked together head to tail, each bowing by as much as 90 degrees, to produce an artificial snake. Obviously, there are numerous other exciting possibilities with electroelastomers. Our laboratory focuses on the materials and actuator aspects of the whole story.

Additional Information:

Professor Qibing Pei joined UCLA in July 2004. He received his Ph.D. in polymer science from the Chinese Academy of Sciences, Beijing. Before joining UCLA Prof. Pei was successively a senior chemist at UNIAX Corporation which was later merged into DuPont Display, and a senior research engineer at SRI International. He has worked on a variety of electro-optic and electro-mechanical devices based on novel polymers he developed, including polymer light emitting diodes, polymer light emitting electrochemical cells, electroactive polymer artificial muscles, and biologically-inspired robots. His research interests cover a wide range of soft materials and span from materials synthesis, processing, to design of functional devices. He applies molecular design and nano-scale engineering in the discovery of new polymers with novel electronic or mechanical property. Prof. Pei also explores new functional devices and integrated systems that may be enabled by the new materials and (nano)structures

Selected Publications:

Yu Z, Zhang Q, Li L, Chen Q, Niu X, Liu J, Pei Q, Highly Flexible Silver Nanowire Electrodes for Shape-Memory Polymer Light-Emitting Diodes, Adv Mater, 2011, 23 (5), 664-8.
Mingliang Sun, Chengmei Zhong, Feng Li, Yong Cao and Qibing Pei, A Fluorene−Oxadiazole Copolymer for White Light-Emitting Electrochemical Cells, Macromolecules, 2010, 43 (4), 1714-18.
Pei Q, Artificial muscles based on synthetic dielectric elastomers, Conf Proc IEEE Eng Med Biol Soc, 2009, 6826 - 6829.
Yu Z, Sun M, Pei Q, Electrochemical formation of stable p-i-n junction in conjugated polymer thin films, J Phys Chem B, 2009, 113 (25), 8481-6.
Liangbing Hu, Wei Yuan, Paul Brochu, George Gruner, and Qibing Pei, Highly stretchable, conductive, and transparent nanotube thin films, Appl. Phys, 2009, 94 (16), 161108 .
Wei Yuan, Paul Brochu, Han Zhang, Antony Jan, and Qibing Pei, Long lifetime dielectric elastomer actuators under continuous high strain actuation, Proc. SPIE, 2009, 7287, 72870O.
Yong Sheng Zhao, Zhibin Yu, Ali Douraghy, Arion F. Chatziioannou, Yueqi Mo and Qibing Pei, A facile route to bulk high-Z polymer composites for gamma ray scintillation, Chem. Commun, 2008 (45), 6008 - 6010.
Dongjuan Xi, Han Zhang, Stephen Furst, Bin Chen and Qibing Pei, Electrochemical Synthesis and Photovoltaic Property of Cadmium Sulfide−Polybithiophene Interdigitated Nanohybrid Thin Films, J. Phys. Chem. C, 2008, 112 (49), 19765–19769.
Zhao YS, Zhong H, Pei Q, Fluorescence resonance energy transfer in conjugated polymer composites for radiation detection, Phys Chem Chem Phys, 2008, 10 (14), 1848-51.
Pei Q, Heeger AJ, Operating mechanism of light-emitting electrochemical cells, Nat Mater, 2008, 7 (3), 167-8.
Haizheng Zhong, YongSheng Zhao, Yongfang Li and Qibing Pei, Photoluminescence quenching of conjugated polymer nanocomposites for gamma ray detection, Nanotechnology, 2008, 19 (50), 505503.
D. Xi, Q. Pei, In-situ Preparation of Free-standing Nanoporous Alumina Template for Polybithiophene Nanotube Arrays with a Concourse Base, Nanotechnology, 2007, 18 (9), 095602.
Z. Yu, D. Xi, T. Lam, Q. Pei., Nanoporous Carbon Nanotube Electrode for Stable Polypyrrole Actuator, Proc. SPIE, 2007, 6524, 652420-1 - 652420-9.
W. Yuan, T. Lam, J. Biggs, L. Hu, Z. Yu, S.M. Ha, D. Xi, M.K. Senesky, G. Gruner, Q. Pei, New Electrode Materials for Dielectric Elastomer Actuators, Proc. SPIE, 2007, 6524, 65240N1-12.
Q. Sun, Y. Li, Q. Pei, Polymer Light-Emitting Electrochemical Cells For High-Efficiency, Low-Voltage Electroluminescent Devices, J. Display Technology, 2007, 3 (2), 211-24.
Y. Yao, C. Shi, G. Li, V. Shrotriya, Q. Pei, and Y. Yang, Effects of C70 Derivative in Low Bandgap Polymer Photovoltaic Devices: Spectral Complementation and Morphology Optimization, Appl. Phys. Lett. , 2006, 89 (15), 153507.
S.M. Ha, W. Yuan, Q. Pei, R. Pelrine, and S. Stanford., Interpenetrating Polymer Networks for High-Performance Electroelastomer Artificial Muscles, Advanced Materials, 2006, 18 (7), 887-891.
D. Xi, J. Li, Q. Pei, B. Chen., Raman Studies of Optical Phonons in Vertical Cadmium Sulfide Nanorod Arrays, J. Mater. Res, 2006, 21 (11), 2911-2915.
C. Shi, Y. Yao, Y. Yang, Q. Pei., Regioregular Copolymers of 3-Alkoxythiophene and Their Photovoltaic Application, J. Am. Chem. Soc, 2006, 128 (27), 8980-8986.
W. Shen, Y. Chen, Q. Pei, Electric Lithography by Electrochemical Polymerization, Appl. Phys. Lett, 2005, 87 (12), 124106.
Q. Pei, S. Pyo, S. Chang, and Y. Yang , Blue Light-emitting Polymers and Devices, Chromongenic Phenomena in Polymers: Tunable Optical Properties (ACS Symposium Series), 2004, American Chemical Society Press (Eds. S.A. Jenekhe and D.J. Kiserow).
Pei, Q., R. Pelrine, M.A. Rosenthal, S. Stanford, H. Prahlad, and R.D. Kornbluh, Recent progress on electroelastomer artificial muscles and their application for biomimetic robots, Proc. SPIE Int. Soc. Opt. Eng, 2004, 5385 (41), 41-50.
Q. Pei, S. Pyo, S.-C. Chang, Y. Yang, Blue Light Emitting Polymers, Polymer Preprints, 2002, 43 (1), 113-4.
F.C. Chen, Y. Yang, and Q. Pei, Phosphorescent Light-Emitting Electrochemical Cells, Appl. Phys. Lett, 2002, 81 (22), 4278-4280.