title: Morphology-Controlled Synthesis of Hybrid Nanocrystals via a Selenium-Mediated Strategy with Ligand Shielding Effect: The Case of Dual Plasmonic Au-Cu2-xSe.
abstract: Integrating a plasmonic metal and a semiconductor at the nanoscale is of great importance for exploring their optical coupling properties. However, the synthesis and fine structural control of such nanostructures remain challenging. Herein we report the facile aqueous-phase Se-mediated overgrowth of metal selenides onto Au nanocrystals. Taking plasmonic Cu2-xSe as an example, the introduction of a Se template allows deposition of large Cu2-xSe crystalline grains onto Au nanocrystal seeds in various shapes, including spheres, rods, and plates. Moreover, the configuration of Au-Cu2-xSe hybrids can be tuned from core-shell to heterodimer structure by controlling the growth behavior of the Se template. Se overgrowth depends critically on the absorption strength of stabilizers on Au seeds: a strongly absorbing stabilizer inhibits isotropic overgrowth, which is in agreement with molecular dynamics simulations. The resultant Au-Cu2-xSe hybrid nanocrystals possess multiple surface plasmon resonance modes. Finally, our synthetic strategy can be extended to prepare other Au-metal selenide hybrids such as Au-Ag2Se and Au-CdSe with controllable morphologies.
authors.affiliation: i-Lab and Division of Nanobiomedicine, CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zou
authors.affiliation: i-Lab and Division of Nanobiomedicine, CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Sun
authors.affiliation: Division of Advanced Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Wenbin
authors.initials: W
authors.lastname: Gong
authors.affiliation: Analytical and Testing Center, South China University of Technology , Guangzhou 510640, China.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Yang
authors.affiliation: i-Lab and Division of Nanobiomedicine, CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Huang
authors.affiliation: i-Lab and Division of Nanobiomedicine, CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Yang
authors.affiliation: Division of Advanced Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Weibang
authors.initials: W
authors.lastname: Lu
authors.affiliation: i-Lab and Division of Nanobiomedicine, CAS Key Laboratory of Nano-Bio Interface, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou 215123, China.
authors.forename: Jiang
authors.identifier: 0000-0003-2127-920X
authors.initials: J
authors.lastname: Jiang
keywords: copper chalcogenide nanocrystals; core−shell; doped semiconductor nanocrystals; geometry control; heteronanostructures; hybrid nanoparticles; metal−semiconductor; plasmon resonance