Chen, Ou - Brown University - Department of Chemistry

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Brown University Department of Chemistry
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个人简介

Associate professor, Chemistry, Brown University 2022- Assistant professor, Chemistry, Brown University 2015-2022 Research scientist, Chemistry, MIT 2014-2015 Post-doctoral, Chemistry, MIT 2010-2014 Ph.D. Chemistry, University of Florida 2004-2010 B.S. Chemical Physics, University of Science and Technology of China 1999-2004

研究领域

Semiconductor nanocrystals, also known as quantum dots (QDs), are emerging as a class of unique materials due to their unparalleled features: a compact size, broad excitation band, large absorption cross section, tunable narrow/symmetric emission profile, superior photostability and solution processability. Research in the Chen laboratory focuses on developing novel QD-based materials ranging from nanoscopic to macroscopic scales and characterizing and elucidating their chemical and physical properties for energy, optical, optoelectronic, catalysis and biological applications. Synthesizing Anisotropic QD NCs with Exquisite Control: The promise of nanoscience cannot be fully realized without robust and reliable synthetic methods to prepare nanomaterials with exquisite control of size, shape, surface and compositions. The uniformity of synthesized nanocrystals (NCs) critically impacts their individual properties and their assembly into high-order architectures. There were few methods for controlled synthesis of anisotropic NCs, thus constraining their exploration as building blocks for superstructural assembly, despite obvious applications. In Chen lab, we are exploring methods to balance reaction kinetics and thermodynamics to generates anisotropic NCs of high quality and uniformity. We are applying the discovered principles to develop a suite of methodologies that enable controlled fabrication and functionalization of high-quality anisotropic QD-based NCs using uniform NCs and/or QDs as seeds. Importantly, ready access to uniform, anisotropic NCs with exquisitely controlled morphology, composition, and surfaces facilitates exploration of their assembly into higher-order superstructural materials for various applications. Assembling NCs into Programmable Superstructural Materials: Organization of nanocrystals (NCs) into larger superstructures is a promising approach for integrating the useful properties of single NCs into macroscopic forms relevant in technology. These NC superstructural materials possess order on multiple length scales with promising and unique functionalities. However, preparing such functional materials requires exquisite structural control from the nano- to macroscopic levels. My research aims to design these materials by developing syntheses of size, shape and surface tailored quantum dot (QD) NC building blocks and exploring methods for their assembly into atomically precise, superstructural nanomaterials. Correlating nanomaterial properties and function to NC chemical composition, atomic arrangement, structural configuration, and interparticle interactions reveals design principles for the next generation of functional materials. These materials are endowed with novel, programmable properties that fully exploit the individual particle as well as the hierarchical superstructure. By using chemical and physical tools, we are trying to explore and understand the novel and enhanced collective properties from the near-field coupling to long-range interactions that occurs between NC neighbors inside the superlattices. Tuning Functionalities and Morphologies of NCs and Superstructures: Armed with the ability to form entirely new types of NC-superstructural materials, we evaluate how to tailor these materials to generate novel and important properties. Until recently, structure-property studies of these systems have been restricted to “confined” nanostructured materials, in which nanoscopic properties of the building blocks remain intact. In our laboratory, we have been developing chemical and physical methodologies to finely tune NCs and their superstructures to enhance near field interactions between particle neighbors. By developing and combining in situ characterization tools, we are exploring methodologies with capabilities to simultaneously probe structure (from atomic to micron scales) and properties (e.g., optical and mechanical properties) in real time. We aim to access quick optimization of the nanomaterials that represents one ideal confined-but-connected structures to reach the best performance of their desired properties. The optimized nanomaterials show promise for a range of technological applications including solar energy harvesting devices, photodetectors, photocatalysts, lighting and displays.

近期论文

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N. Jin, Y. Sun, W. Shi, P. Wang, Y. Nagaoka, T. Cai, R. Wu, L. Dube, H. Nyiera, Y. Liu, T. Mani, X. Wang, J. Zhao, and O. Chen*. Type-I CdS/ZnS Core/Shell Quantum Dot-Gold Heterostructural Nanocrystals for Enhanced Photocatalytic Hydrogen Generation. J. Am. Chem. Soc. 2023, 145, 21886-21896. Y. Nagaoka*, P. Saghy, and O. Chen. The Art of Peer Pressure Between Nanocrystals: High-Pressure Surface Nanochemistry. MRS Communications 2023, ASAP. K. Kobbekaduwa, E. Liu, Q. Zhao, J. Bains, J. Zhang, Y. Shi, H. Zheng, D. Li, T. Cai, O. Chen, A. Rao, M. Beard, J. Luther, and J. Gao*. Ultrafast Carrier Drift Transport Dynamics in CsPbI3 Perovskite Nanocrystalline Thin Films. ACS Nano 2023, 17, 13997-14004. J. Wang, T. Cai, and O. Chen*. Cesium Copper Halide Perovskite Nanocrystal-Based Photon-Managing Devices for Enhanced Ultraviolet Photon Harvesting. Nano Letters 2023, 23, 4367-4374. P. Saghy, A. Brown, C. Chu, L. Dube, W. Zheng, J. Robinson*, and O. Chen*. Lanthanide Double Perovskite Nanocrystals with Emissions Covering the UV-C to NIR Spectral Range. Advanced Optical Materials 2023, 2300277. S. Lu, D. Morrow, Z. Li, C. Guo, X. Yu, H. Wang*, J. Schultz, J. O’Connor, N. Jin, F. Fang, W. Wang, R. Cui, O. Chen, C. Su, M. Wasielewski, X. Ma*, and X. Li*. Encapsulating Semiconductor Quantum Dots in Supramolecular Cages Enables Ultrafast Guest-Host Electron and Vibrational Energy Transfer. J. Am. Chem. Soc. 2023, 145, 5191-5202. W. MacSwain, H. Lin, Z. Li, S. Li, C. Chu, L. Dube, O. Chen, G. Leem, and W. Zheng*. Facilitated Electron Transfer by Mn Dopants in 1-Dimensional CdS Nanorods for Enhanced Photocatalytic Hydrogen Generation. J. Mater. Chem. A 2023, 11, 7066-7076. Z. Liu, Y. Sun, T. Cai, H. Yang, J. Zhao, T. Yin, C. Hao, M. Chen, W. Shi, X. Li, L. Guan, X. Li, X. Wang, A. Tang*, and O. Chen*. Two-Dimensional Cs2AgInxBi1-xCl6 Alloyed Double Perovskite Nanoplatelets for Solution-Processed Light-Emitting Diodes. Advanced Materials 2023, 25, 2211235. H. Yang, W. Shi, Y. Nagaoka, Z. Liu, R. Li, and O. Chen*. Access and Capture of Layered Double Perovskite Polytypic Phase through High-Pressure Engineering. J. Phys. Chem. C 2023, 127, 2407-2415 T. Cai, L. Dube, P. Saghy, H. Yang, and O. Chen*. Progress in All-Inorganic Heterometallic Halide Layered Double Perovskites. Trends in Chemistry 2023, 5, 29-44 Y. Nagaoka, J. Schneider, H. Zhu, and O. Chen*. Quasicrystalline Materials from Non-Atom Building Blocks. Matter 2023, 6, 30-58. P. Wang*, W. Shi, N. Jin, Z. Liu, Y. Wang, T. Cai, K. Hills-Kimball, H. Yang, X. Yang, Y. Jin, Z. Wang, J. Zhao, and O. Chen*. Counterbalancing of Electron and Hole Transfer in Quantum Dots for Enhanced Photocatalytic H2 Evolution. Nano Research 2023, 16, 2271-2277. I. Peng, K. Hills-Kimball, I. M. Lovelace, J. Wang, M. Rios, O. Chen, and L-Q. Wang*. Exploring the Colors of Copper-Containing Pigments, Copper(II) Oxide and Malachite, and Their Origins in Ceramic Glazes. Colorants 2022, 1(4), 376-387. H. Zhu, Z. Fan, S. Song, D. Eggert, Y. Liu, W. Shi, Y. Yuan, K.-S. Kim, M. Gruenwald*, and O. Chen*. Dual Atomic Coherence in the Self-Assembly of Patchy Heterostructural Nanocrystals. ACS Nano 2022, 16, 15053-15062. J. Wang, Y. Yuan, J. Schneider, W. Zhou, H. Zhu, T. Cai, and O. Chen*. Quantum Dot-Based Luminescent Solar Concentrators Fabricated through the Ultrasonic Spray-Coating Method. ACS Applied Materials & Interfaces 2022, 14, 41013-41021. H. Yang, T. Cai, L. Dube, and O. Chen*. Synthesis of Double Perovskite and Quadruple Perovskite Nanocrystals Through Post-Synthetic Transformation Reactions. Chemical Science 2022, 13, 4874-4883. Y. Sun, Y. Wang, H. Zhu, N. Jin, A. Mohammad, N. Biyikli, O. Chen, K. Chen, and J. Zhao*. Excitation Wavelength-Dependent Photoluminescence Decay of Single Quantum Dots Near Plasmonic Gold Nanoparticles. J. Chem. Phys. 2022, 156, 154701. Y. Yuan, D. Kim, J. Zhou, D. Chang, F. Zhu, Y. Nagaoka, Y. Yang, M. Pham, S. Oscher, O. Chen, P. Ercius, A. Schmid, and J. Miao*. Three-Dimensional Atomic Packing in Amorphous Solids with Liquid-Like Structure. Nature Materials 2022, 21, 95-102. K. Hills-Kimball, I. Lovelace, I. Peng, J. Wang, H. Garces, M. Rios, O. Chen, and L-Q. Wang*. New Insights to the Interactions between Amorphous Georgite Pigment and Linseed Oil Binder that Lead to a Drastic Color Change. Inorganica Chimica Acta 2022, 529 120661. T. Cai, W. Shi, D. Gosztola, K. Kobbekaduwa, H. Yang, N. Jin, Y. Nagaoka, L. Dube, J. Schneider, S. Hwang, J. Gao, X. Ma, and O. Chen*. Colloidal Synthesis and Charge Carrier Dynamics of Cs4Cd1-xCuxSb2Cl12 (0 ≤ x ≤ 1) Layered Double Perovskite Nanocrystals. Matter 2021, 4, 2936-2952. S. Lohmann, T. Cai, D. Morrow, O. Chen, and X. Ma*. Brightening of Dark States in CsPbBr3 Quantum Dots Caused by Light-Induced Magnetism. Small 2021, 2101527. Y. Yuan#, N. Jin#, P. Saghy, L. Dube, H. Zhu, and O. Chen*. Quantum Dot Photocatalysts for Organic Transformations. J. Phys. Chem. L 2021, 12, 7180-7193. Y. Sun, H. Zhu, N. Jin, O. Chen, and J. Zhao*. Fast Lifetime Blinking in Compact CdSe/CdS Core/Shell Quantum Dots. J. Phys. Chem. C 2021, 125, 15433-15440. F. Bateni, R. Epps, K. Abdel-latif, R. Dargis, S. Han, A. Volk, M. Ramezani, T. Cai, O. Chen, and M. Abolhasani*. Ultrafast Cation Doping of Perovskite Quantum Dots in Flow. Matter 2021, 4, 2429-2447. K. Hills-Kimball, H. Yang, T. Cai, J. Wang, and O. Chen*. Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals. Advanced Science 2021, 2100214. Y. Lv, Y. Yuan, N. Hu, N. Jin, D. Xu*, R. Wu, H. Shen, O. Chen* and L. S. Li*. Thick-Shell CdSe/ZnS/CdZnS/ZnS Core/Shell Quantum Dots for Quantitative Immunoassays. ACS Applied Nano Materials 2021, 4, 2855-2865. H. Yang, T. Cai, L. Dube. K. Hills-Kimball, and O. Chen*. Synthesis of Ultrathin Perovskite Nanowires via a Postsynthetic Transformation Reaction of Zero-Dimensional Perovskite Nanocrystals. Crystal Growth & Design 2021, 21, 1924-1930. Z. Liu, H. Yang, J. Wang, Y. Yuan, K. Hills-Kimball, T. Cai, P. Wang, A. Tang*, and O. Chen*. Synthesis of Lead-Free Cs2AgBiX6 (X = Cl, Br, I) Double Perovskite Nanoplatelets and Their Application in CO2 Photocatalytic Reduction. Nano Letters 2021, 21, 1620-1627. Y. Nagaoka, M. Suda, I Yoon, N. Chen, H. Yang, Y. Liu, B. A. Anzures, S. W. Parman, Z. Wang, M. Gruenwald, H. Yamamoto, O. Chen*. Bulk Grain-Boundary Materials from Nanocrystals. Chem 2021, 7, 509-525. Highlighted at: News at Brown, Brown University A. Fischer, M. Jaeckstein, K. Gottschling, M. Heine, F. Sass, N. Mangels, C. Schlein, A. Worthmann, O. T. Bruns, Y. Yuan, H. Zhu, O. Chen, H. Ittrich, S. Nilsson, P. Stefanicka, J. Ukropec, M. Balaz, H. Dong, W. Sun, R. Reimer, L. Scheja, J. Heeren*. Lysosomal Lipoprotein Processing in Endothelial Cells Stimulateds Adipose Tissue Thermogenic Adaptation. Cell Metabolism 2021, 33, 1-18. H. Yang, W. Shi, T. Cai, K. Hills-Kimball, Z. Liu, L. Dube and O. Chen*. Synthesis of Lead-Free Cs4(Cd1-xMnx)Bi2Cl12 (0 ≤ x ≤ 1) Layered Double Perovskite Nanocrystals with Controlled Mn-Mn Coupling Interaction. Nanoscale 2020, 12, 23191-23199. W. Shi#, T. Cai#, Z. Wang* and O. Chen*. The effects of monovalent metal cations on the crystal and electronic structures of Cs2MBiCl6 (M = Ag, Cu, Na, K, Rb, and Cs) perovskites. J. Chem. Phys. 2020, 153, 141101. Y. Yuan, H. Zhu, K. Hills-Kimball, T. Cai, W. Shi, Z. Wei, H. Yang, Y. Candler, P. Wang, J. He and O. Chen*. Stereoselective C–C Oxidative Coupling Reactions Photocatalyzed by Zwitterion Ligands Capped CsPbBr3 Perovskite Quantum Dots. Angew. Chem. Int. Ed. 2020, 59, 2-9. J. Yi, X. Ge, E. Liu, T. Cai, C. Zhao, S. Wen, H. Sanabria, O. Chen, A. Rao,* and J. Gao*. The Correlation between Phase Transition and Photoluminescence Properties of CsPbX3 (X=Cl, Br, I) Perovskite Nanocrystals. Nanoscale Advances 2020, 2, 4390-4394. T. Cai, J. Wang, W. Li, K. Hills-Kimball, H. Yang, Y. Nagaoka, Y. Yuan, R. Zia and O. Chen*. Mn2+/Yb3+ Codoped CsPbCl3 Perovskite Nanocrystals with Triple-Wavelength Emission for Luminescent Solar Concentrators. Advanced Science 2020, 2001317. T. Cai, W. Shi, S. Hwang, K. Kobbekaduwa, Y. Nagaoka, H. Yang, K. Hills-Kimball, H. Zhu, J. Wang, Z. Wang, Y. Liu, D. Su, J. Gao and O. Chen*. Lead-Free Cs4CuSb2Cl12 Layered Double Perovskite Nanocrystals. J. Am. Chem. Soc. 2020, 142, 11927-11936. L. Peng, H. Zhu, W. Wang, O. Chen and X. Ma*. Influence of Local Structures on the Energy Transfer Efficiencies of Quantum-Dot Films. Physical Review B 2020, 102, 035437. Q. Li, D. Zhou, J. Chai, W. So, T. Cai, M. Li, L. Peteanu, O. Chen, M Cotlet, X. W. Gu,* H. Zhu* and R. Jin*. Structural Distortion and Electron Redistribution in Dual-Emitting Gold Nanoclusters. Nature Communications 2020, 11, 2897. K. Hills-Kimball, M. Jesus Perez, Y. Nagaoka, T. Cai, H. Yang, A. H. Davis, W. Zheng and O. Chen*. Ligand Engineering for Mn2+ Doping Control in CsPbCl3 Perovskite Nanocrystals via a Quasi-Solid-Solid Cation Exchange Reaction. Chemistry of Materials 2020, 32, 2489-2500. Y. Luo, Y. Wang, M. Liu, H. Zhu, O. Chen, S. Zou and J. Zhao*. Colloidal Assembly of Au–Quantum Dot–Au Sandwiched Nanostructures with Strong Plasmon–Exciton Coupling. J. Phys. Chem. Lett. 2020, 11, 2449-2456. J. Xu, Y. Yuan, M. Liu, S. Zou, O. Chen and D. Zhang*. Quantification of the Photon Absorption, Scattering, and On-resonance Emission Properties of CdSe/CdS Core/Shell Quantum Dots: Effect of Shell Geometry and Volumes. Analytical Chemistry 2020, 92, 5346-5353. L. Jin, X. Su, J. Shi, K-C. Shih, D. Cintron, T. Cai, M-P. Nieh, O. Chen, S. Suib, M. Jain* and J. He*. Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response. Advanced Functional Materials 2020, 1909491. H. Yang, T. Cai, E. Liu, K. Hills-Kimball, J. Gao and O. Chen*. Synthesis and Transformation of Zero-Dimensional Cs3BiX6 (X = Cl, Br) Perovskite-Analogue Nanocrystals. Nano Research 2020, 13, 282-291. Z. Xi, X. Cheng, Z. Gao, M. Wang, T. Cai, M. Muzzio, E. Davidson, O. Chen, Y. Jung, S. Sun, Y. Xu* and X. Xia*. Strain Effect in Palladium Nanostructures as Nanozymes. Nano Letters 2020, 20, 272-277. J. Wang, Y. Yuan, H. Zhu, T. Cai, Y. Fang and O. Chen*. Three-Dimensional Macroporous Photonic Crystal Enhanced Photon Collection for Quantum Dot-Based Luminescent Solar Concentrator. Nano Energy 2020, 67, 104217. E. Liu, H. Zhu, J. Yi, K. Kobbekaduwa, P. Adhikari, J. Liu, Y. Shi, J. Zhang, H. Li,A. Oprisan, A. M. Rao, H. Sanabria*, O. Chen* and J. Gao*. Manipulating charge transfer from core to shell in CdSe/CdS/Au heterojunction quantum dots. ACS Applied Materials & Interfaces 2019, 11, 48551-48555. H. Zhu, T. Cai, Y. Yuan, X. Wang, Y. Nagaoka, J. Zhao, Z. Liu, R. Li and O. Chen*. Pressure-Induced Transformations of Three-Component Heterostructural Nanocrystals with CdS-Au2S Janus Nanoparticles as Hosts and Small Au Nanoparticles as Satellites. ACS Applied Nano Materials 2019, 2, 6804-6808. C. Yu, X. Guo, Z. Yin, Z. Zhao, X. Li, J. Robinson, M. Muzzio, C. Barbosa, M. Shen, Y. Yuan, J. Wang, J. Antolik, G. Lu, D. Su, O. Chen, P. Guduru, C. Seto* and S. Sun*. Highly Efficient AuPd Nanoparticle Catalyst for Synthesizing Polybenzoxazole with Controlled Polymerization. Matter 2019, 1, 1-13. H. Yang, W. Fan. K, Hills-Kimball, O. Chen* and L-Q. Wang*. Introducing Manganese-Doped Lead-Halide Perovskite Quantum Dots – A Simple Synthesis Illustrating Optoelectronic Properties of Semiconductors. Journal of Chemical Education 2019, 96, 2300-2307. M. Que, Z. Dai, H. Yang, H. Zhu, Y. Zong, W. Que*, N. Padture*, Y. Zhou* and O. Chen*. Quantum-Dot-Induced Cesium-Rich Surface Imparts Enhanced Stability to Formamidinium Lead Iodide Perovskite Solar Cells. ACS Energy Letters 2019, 4, 1970-1975. J. Xu, Y. Yuan, S. Zou, O. Chen and D. Zhang*. A Divide-and-Conquer Strategy for Quantification of Light Absorption, Scattering, and Emission Properties of Fluorescent Nanomaterials in Solutions. Analytical Chemistry 2019, 91, 8540-8548. Y. Zhang#, H. Yang#, M. Chen, N. Padture*, O. Chen* and Y. Zhou*. Fusing Nanocrystals into Thin-Films: Fabrication of High-Performance Perovskite Solar Cells with a Laterally-Homogeneous Graded-Heterojunction. Advanced Energy Materials 2019, 1900243 (# Equal contribution). N. Chen, T. Cai, W. Li, K. Hills-Kimball, H. Yang, M. Que, Y. Nagaoka, Z. Liu, D. Yang, A. Dong, C. Xu, R. Zia and O. Chen*. Yb- and Mn-Doped Lead-Free Double-Perovskite Cs2AgBiX6 (X = Cl-, Br-) Nanocrystals. ACS Applied Materials & Interfaces 2019, 11, 16855-16863. J. Zhao*, O. Chen*, J. He* and S. Zou*. Editorial: Metal and Semiconductor Nanocrystals. Frontiers in Chemistry 2019, 7, 310. H. Zhu, Z, Fan, L. Yu, M. A. Wilson, Y. Nagaoka, D. Eggert, C. Cao, Y. Liu, Z. Wei, X. Wang, J. He, J. Zhao, R. Li, Z. Wang, M. Gruenwald* and O. Chen*. Controlling Nanoparticle Orientations in Self-Assembly of ‘Patchy’ Quantum Dot-Gold Heterostructural Nanocrystals. J. Am. Chem. Soc. 2019, 141, 6013-6021. Y. Yuan, H. Zhu, X. Wang, D. Cui, Z. Gao, D. Su, J. Zhao and O. Chen*. Cu-Catalyzed Synthesis of CdZnSe-CdZnS Alloy Quantum Dots with Highly Tunable Emission. Chemistry of Materials 2019, 31, 2635-2643. Y. Yuan, H. Zhu, Y. Nagaoka, R. Tan, A. H. Davis, W. Zheng and O. Chen*. Reversible Photo-Switching of Dual Color Fluorescent Mn-Doped CdS-ZnS Quantum Dots Modulated by Diarylethene Molecules. Frontiers in Chemistry 2019, 7, 145.

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