Pei, Qibing - University of California, Los Angeles

个人简介

Qibing Pei is professor of materials science and engineering specializing in electroactive polymers. He worked successively as a senior chemist at UNIAX Corporation, Santa Barbara, CA, which was later merged into DuPont Display, a senior chemist at Imation Corporation, Santa Paul, MN, and a senior research engineer at SRI International, Menlo Park, CA. He has developed a number of electronic and electroactive polymers for applications in electro-optic and electro-mechanical devices, including 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 material synthesis, processing, to design of functional devices. He applies polymer synthesis, solution-based processing and nanofabrication in the discovery of new functional polymers and composites. He has published about 120 papers in refereed journals with 8000 SCI citations and an H-factor of 41. He is inventor or co-inventor of 39 US patents.

研究领域

Our Soft Materials Research Laboratory studies electroactive polymers and nanostructured hybrid materials. The research focuses on molecular synthesis and nanofabrication for the development of new polymers and nanostructures with desired electronic, photonic, and/or mechanical properties. The applications of these materials are many folds, including flexible electronics, artificial muscles, photovoltaics, wind energy generation, radiation detection and protection, and biologically-inspired systems to name a few. Current activities include: Artificial Muscles: These are based on dielectric elastomers exhibiting electrically-induced strains as high as 300%. The polymer transducers have such advantages as high energy and power densities, quietness, mechanical compliancy (for shock resistance and impedance matching), high efficiency, lightweight, and low cost. To improve the device performance and reliability, interpenetrating polymer networks are being studied as a new generation of electroelastomers. Fault tolerance is being introduced as a means to prolong operation lifetime. Our projects involve mechanical design, fabrication, and testing of polymer actuators and generators. Bistable electroactive polymer has been introduced for large-strain, rigid-to-rigid actuation. This material is being employed to fabricate Braille electronic readers. Flexible electronics: We are developing electronic devices that are flexible and stretchable. A key component is stretchable transparent electrodes based on composites of carbon nanotubes and silver nanowires. The composites electrodes have sheet resistance and transmission of visible light comparable to indium tin oxide coated on PET and glass. Polymer light emitting diodes and solar cells fabricated on the composite electrodes perform as well as or better than control devices on ITO/glass. Using the composite electrodes, we have demonstrated polymer LEDs wherein the active area is stretchable. Nanostructured hybrid materials: Composites of inorganic compounds and conjugated polymers are prepared with controlled nanostructures for photovoltaics or radiation detection. We synthesized CdS nanorod arrays by electrochemical self-assembly, and CdS thin coating by chemical bath deposition. High-Z nanoparticle polymer composites are studied for gamma and X-ray scintillation. Synthesis of conjugated polymers: The band gap, band edges (electron affinity and ionization potential), optical absorption, photoluminescence color and quantum efficiency, and carrier mobility can be modulated through the conjugated backbone or side chains, structural regularity, molecular weight, purity, and molecular ordering. We can thus tailor conjugated polymers for different applications such as light emitting diodes, solar cells, thin film transistors, and sensors. We fabricate semiconductor devices (LEDs, solar cells) using the selected polymers.

近期论文

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C. Murray, D. McCoul, E. Sollier, T. Ruggiero, X. Niu, Q. Pei, D. Di Carlo, “Electro-adaptive microfluidics for active tuning of channel geometry using polymer actuators”, Microfluidics and Nanofluidics, 14(1), 345-358 (2013). H. Stoyanov, P. Brochu, X. Niu, C. Lai, S. Yun and Q. Pei, “Long lifetime, fault-tolerant freestanding actuators based on a silicone dielectric elastomer and self-clearing carbon nanotube compliant electrodes,” RSC Advances, 3 (7), 2272 – 2278 (2013). X. Niu, H. Stoyanov, W. Hu, R. Leo, P. Brochu, Q. Pei, “Synthesizing a New Dielectric Elastomer Exhibiting Large Actuation Strain and Suppressed Electromechanical Instability without Prestretching”, J. Polymer Science, Part B: Polymer Physics, 51, 197–206 (2013). L. Li, J. Liu, Z. Yu, Q. Pei, “Efficient White Polymer Light-Emitting Diodes Employing a Silver Nanowire-Polymer Composite Electrode”, Phys. Chem. Chem. Phys., 14 (41), 14249 – 14254 (2012). W. Hu, X. Niu, L. Li, S. Yun, Z. Yu, and Q. Pei, “Intrinsically stretchable transparent electrodes based on silver-nanowire–crosslinked-polyacrylate composites”, Nanotechnology 23, 344002 (2012). H. Stoyanov, P. Brochu, X, Niu, E.D. Gaspera, Q. Pei, “Dielectric elastomer transducers with enhanced force output and work density”, Applied Physics Letters, 100, 262902 (2012). S. Yun, X. Niu, Z. Yu, W. Hu, P. Brochu, Q. Pei, “Compliant Silver Nanowire-Polymer Composite Electrodes for Bistable Large Strain Actuation”, Advanced Materials, 24, 1321-1327 (2012). L. Li, Z. Yu, W. Hu, C.-H. Chang, Q. Chen and Q. Pei, “Efficient Flexible Phosphorescent Polymer Light-Emitting Diodes Based on Silver Nanowire-Polymer Composite Electrode”, Advanced Materials, 23(46), 5563–5567 (2011). Z. Yu, L. Li, Q. Zhang, W. Hu, Q. Pei, “Silver Nanowire-Polymer Composite Electrodes for Efficient Polymer Solar Cells”, Adv Mater. 23(38), 4453-4457 (2011).