Assistant Professor of Chemical Engineering
School of Chemical Engineering
Forney Hall of Chemical Engineering
480 Stadium Mall Drive
West Lafayette, IN 47907-2100
Our laboratory focuses on the investigation of broadly-defined nanostructured materials for their potential applications in nanoscale devices and renewable energy-related field. Our highly interdisciplinary research program includes the design, synthesis, characterization, and assembly of nanostructured materials, elucidation of the fundamental electronic, optical, and other physical properties of these materials, and exploration of new science and applications in diverse areas related with renewable energy, such as photovoltaic solar cells, catalysis, thermoelectric, water splitting, etc
We are focusing on the rational synthesis of new nanostructured materials with atomic layer precision that can enable revolutionary advances in nanoscale science and technology. Our research includes two major categories of nanomaterials: (1) the "traditional" semiconductor nanostructures and heterostructures; (2) the "innovative" complex oxide nanostructures, particularly perovskite oxide nanostructures, and heterostructures composed of complex oxides or complex oxides/semiconductors. The morphologies of interest include thin films, nanocrystals, nanowires, and nanotubes.
We are studying the transport of electron and hole charge carriers and the confinement of photons and phonons in the nanostructures though various measurement techniques. Our investigation in the fundamental properties of nanostructured materials covers two directions: (1) the surface and interface properties of semiconductor nanocrystals and nanowires, as well as their heterostructures; (2) the ferroelectric, pyroelectric, and piezoelectric properties of perovskite oxide nanowires and nanowire heterostructures. We are also interested to extend our research into the magnetic properties and non-linear optical properties of these complex oxide materials in the future.
We are looking into the scalable assembly methods on multiple length scales independent of the specific composition, structure, and substrate, which is the essential for the nanotechnology development. Our study in the scalable assembly techniques includes two approaches: (1) the Langmuir-Blodgett assembly of nanocrystals and nanowires in a layer-by-layer manner; (2) the biomimetic assembly through molecular recognition/interaction by grafting various surfactant molecules onto nanostructure surfaces.
We are realizing true nanotechnologies by pursuing a number of applications at the device and systems levels with specific emphasis on nanoelectrics, nanophotonics, and renewable energy, which include but not limit to: (1) nanoelectronics, including transistors, memories, logic circuits, etc; (2) nanophotonics, including solar cells, LEDs, electro-optical modulators, etc; (3) photocatalysis and thermal energy conversion.
Bio-Nano Hybrid Structures
We are exploring the functionalities of inorganic and biological hybrid materials that may bring breakthroughs in both fundamental understanding of biological science and lead to revolutionary technologies toward smart system with multiple functionalities.
- Haiyu Fang
- Scott Finefrock
- Jaewon Lee
- Guatam Yadav
- Haoran Yang
Awards and Honors
“Rational Synthesis of Ultrathin n-type Bi2Te3 Nanowires with Enhanced Thermoelectric Properties,” G. Zhang, B. Kirk, L. A. Jauregui, H. Yang, X. Xu, Y. P. Chen, and Y. Wu, Nano Letters, 12, 56-60 (2012)
“Molecular Dynamics Simulations of Lattice Thermal Conductivity and Spectral Phonon Mean Free Path of PbTe: Bulk and Nanostructures,” B. Qiu, H. Bao, G. Zhang, Y. Wu, and X. Ruan, Computational Materials Science, 53, 278-285 (2012)
“Nontoxic and Abundant Copper Zinc Tin Sulfide Nanocrystals for Potential High-Temperature Thermoelectric Energy Harvesting,” H. Yang, L. A. Jauregui, G. Zhang, Y. P. Chen, and Y. Wu, Nano Letters, 12, 540-545 (2012)
“Flexible Nanocrystal-Coated Glass Fibers for High-Performance Thermoelectric Energy Harvesting.” D. Liang, H. Yang, S. W. Finefrock, and Y. Wu, Nano Letters, 12, 2140 (2012)
“Design Principle of Telluride-based Nanowire Heterostructures for Potential Thermoelectric Applications,” G. Zhang, H. Fang, H. Yang, L. A. Jauregui, Y. Chen, and Y. Wu, Nano Letters, 12, 3627 (2012)
“Nanostructured Thermoelectric: Opportunities and Challenges,” Y. Wu, S. Finefrock, and H. Yang, Nano Energy, Invited opinion, in press (2012)
“Semiconductor Nanostructure-based Photovoltaic Solar Cells,” G. Zhang, D. Liang, G. G. Yadav, H. Yang, and Y. Wu, Invited Review, Nanoscale, 3, 2430-2443 (2011)
“Self-Templated Synthesis and Thermal Conductivity Investigation for Ultrathin Perovskite Oxide Nanowires,” G. G. Yadav, G. Zhang, B. Qiu, J. A. Susoreny, X. Ruan, and Y. Wu, Nanoscale, 3, 4078-4081 (2011)
“Nanostructure-Based Thermoelectric Conversion: An Insight into the Feasibility and Sustainability for Large-Scale Deployment,” G. G. Yadav, J. A. Susoreny, G. Zhang, H. Yang, and Y. Wu, feature article, Nanoscale, 3, 3555-3562, (2011)