个人简介

Education: B.Sc., University of Science and Technology of China; Ph.D., Yale University, Post-doc. (Cornell)

研究领域

Synthetic Methodology for Nanostructures/Applications of Nanomaterials

Research Interest Nanostructure synthesis To date, most of the nanostructures reported in the literature are of single-component and have simple geometries such as sphere and cube. Sophisticated nano-devices or nanomachines in the future will certainly require complex components and assembly techniques In a way, the synthetic development of nanostructures can be likened to that of organic chemistry. Two hundred years ago, people cannot make complex drug molecules or natural products. It was the development of synthetic methodologies and purification methods, and the under-standing in reaction mechanisms, among others, that made everything possible. Our research focus Our research mostly deals with colloidal nanostructures. We focus on the synthesis of (a) core-shell structures, (b) Janus (two-sided) nanoparticles, (c) dendritic nanostruc-tures, (d) organic-inorganic composites, and (e) develop-ment of linear and 2D assembly techniques, and (f) study of conformational changes of nano-objects. From application point of view, we are interested in (a) plasmonic and fluorescent nanostructures for sensing and detection, (b) drug delivery, (c) composite materials, and (d) magnetic materials for data storage. Active nanostructures A major thrust in advancing nanoscience, in my opinion, is to develop nanostructures that can move. Their confor-mational changes, when predictable, open doors to future development of smart nano-devices. In biology, conforma-tional changes of proteins are the foundation of enzymatic activity (e.g., ATP synthase) and cell motility (e.g., myosin in muscle cells). In comparison to translational motion, conformational motion is less affected by random Brownian forces. To set nanostructures in predictable motion, we have to understand their intrinsic properties and devise corresponding strategies. We show that polymer shells (PS-b-PAA) coated on Au nanowires act like liquid droplets. We can tune the solvent ratio to affect the polymer/solvent interfacial tension, and make the polymer contract in minimizing its surface/ volume ratio. The embedded Au nanowire cannot escape and thus, is forced to coil into rings. The same strategy can be applied to coil carbon nanotube bundles into ring structures. Since carbon nanotubes are robust, we can reversibly compress and release these rings by tuning solvent ratio. Most recently, we report a new type of Au-Ag alloy nanowires; upon Pd deposition they wind around themselves to form double helices. The Au-Ag alloy nanowires have a special type of twisted lattice. The Pd growth induces lattice strain; the relieving of this strain forced the entire wire to untwist, giving a double helix.

近期论文

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"Chiral Gold Nanowires with Boerdijk-Coxeter-Bernal Structure", Yihan Zhu*, Jiating He, Cheng Shang, Xiaohe Miao, Jianfeng Huang, Zhipan Liu, Hongyu Chen*, and Yu Han*, Journal of the American Chemical Society, 2014, 136 (36), pp 12746-12752 "Understanding the Phase Emergence of Mesoporous Silica", Lin Yao, Cuicui Liu, Wen Han Chong, Hong Wang, Liyong Chen, and Hongyu Chen*, Small, 2015, Vol 11, Iss 2, pp 232-238. "Homo- and Co-polymerization of Nanoparticles", Hong Wang, Xiaohui Song (co-1st author), Cuicui Liu, Jiating He, Wen Han Chong, and Hongyu Chen*, ACS Nano, 2014, 8 (8), pp 8063-8073. "Thermodynamics versus Kinetics in Nanosynthesis", Yawen Wang, Jiating He, Cuicui Liu, Wen Han Chong, and Hongyu Chen*, Angewandte Chemie-International Edition, 2015, Vol 54, Iss 7, pp 2022-2051. "Strategy for Nano-Catalysis in a Fixed-Bed System", Jiating He, Weijie Ji, Lin Yao, Yawen Wang, Bahareh Khezri, Richard D. Webster, and Hongyu Chen*, Advanced Materials, 2014, Vol 26, Iss 24, pp 4151-4155 "Bridging the Gap in the Micellar Transformation from Cylinders to Vesicles", Cuicui Liu, Lin Yao, Hong Wang, Zai Rong Phua, Xiaohui Song, and Hongyu Chen*, Small, 2014, Vol 10, Iss 7, pages 1332-1340 "Graphene-Based Materials for Solar Cell Applications", Zongyou Yin, Jixin Zhu, Qiyuan He, Xiehong Cao, Chaoliang Tan, Hongyu Chen, Qingyu Yan, and Hua Zhang*, Advanced Energy Materials, 2014, Vol 4, Iss 1, 1300574 "3-D Plasmonic Nanoclusters", Alexander Urban, Xiaoshuang Shen (co-first author), Yumin Wang, Nicolas Large, Wang Hong, Mark W. Knight, Peter Nordlander*, Hongyu Chen*, and Naomi J. Halas*, Nano Letters, 2013, 13 (9), pp 4399-4403 "Investigating the Multiple Roles of Polyvinylpyrrolidone for A General Methodology of Oxide Encapsulation", Hang Sun, Jiating He, Jiangyan Wang, Shuangyuan Zhang, Cuicui Liu, Thirumany Sritharan, Subodh Mhaisalkar, Ming-Yong Han, Dan Wang*, and Hongyu Chen*, Journal of the American Chemical Society, 2013, 135 (24), pp 9099-9110 "Stirring in Suspension: Nanometer-sized Magnetic Stirbars", Wen Han Chong, Lip Ket Chin, Rachel Lee Siew Tan, Hong Wang, Ai-Qun Liu, and Hongyu Chen*, Angewandte Chemie-International Edition, 2013, Vol 52, Iss 33, pp8570-8573 "Preservation of Lattice Orientation in Coalescing Imperfectly Aligned Gold Nanowires by a Zipper Mechanism", Jun Xu, Yawen Wang, Xiaoying Qi, Cuicui Liu, Jiating He, Hua Zhang, and Hongyu Chen*, Angewandte Chemie-International Edition, 2013, Vol 52, Iss 23, pages 6019-6023 "Density-Controlled Synthesis of Uniform ZnO Nanowires: Wide-Range Tunability and Growth Regime Transition", Dong Lai Guo, Li Huey Tan, Zhi Peng Wei, Hongyu Chen*, and Tom Wu*, Small, 2013, Vol 9, Iss 12, pages 2069-2075 "Exploiting Core-Shell Synergy for Nanosynthesis and Mechanistic Investigation", Hong Wang, Liyong Chen, Yuhua Feng, and Hongyu Chen*, Accounts of Chemical Research, 2013, 46 (7), pp 1636-1646 "Emerging Chirality in Nanoscience", Yong Wang, Jun Xu, Yawen Wang and Hongyu Chen*, Chemical Society Reviews, 2013, 42, 2930-2962 "Forest of Gold Nanowires: A New Type of Nanocrystal Growth", Jiating He, Yawen Wang (co-1st author), Yuhua Feng, Xiaoying Qi, Zhiyuan Zeng, Qing Liu, Wei Shan Teo, Chee Lip Gan, Hua Zhang, and Hongyu Chen*, ACS Nano, 2013, 7 (3), pp 2733-2740 "General Methodology of Using Oil-in-Water and Water-in-Oil Emulsions for Coiling Nanofilaments", Liyong Chen, Suzhu Yu, Hong Wang, Jun Xu, Cuicui Liu, Wen Han Chong, and Hongyu Chen*, Journal of the American Chemical Society, 2013, 135 (2), pp 835-843 "Functional Free-Standing Graphene Honeycomb Films", Shengyan Yin, Yulia Goldovsky, Moshe Herzberg, Lei Liu, Hang Sun, Yanyan Zhang, Fanben Meng, Xuebo Cao, Darren D. Sun, Hongyu Chen, Ariel Kushmaro1, Xiaodong Chen*, Advanced Functional Materials, 2013, Vol 23, Iss 23, pages 2972-2978 "Facile and efficient preparation of anisotropic DNA-functionalized gold nanoparticles and their regioselective assembly", Li Huey Tan, Hang Xing, Hongyu Chen, and Yi Lu*, Journal of the American Chemical Society, 2013, 135 (47), pp 17675-17678 "Induced Coiling Action: Exploring the Intrinsic Defects in Five-Fold Twinned Silver Nanowires", Liangfang Zhu, Xiaoshuang Shen, Zhiyuan Zeng, Hong Wang, Hua Zhang, and Hongyu Chen*, ACS Nano, 2012, 6 (7), pp 6033-6039 "Unconventional Chain-Growth Mode in the Assembly of Colloidal Au Nanoparticles", Hong Wang, Liyong Chen, Xiaoshuang Shen, Liangfang Zhu, Jiating He, and Hongyu Chen*, Angewandte Chemie-International Edition, 2012, Vol 51, Iss 32, pages 8021-8025