Ji Feng

ORCID: 0000-0002-9873-4840
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About
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Research Areas
  • Photorefractive and Nonlinear Optics
  • Advanced Fiber Laser Technologies
  • Advanced ceramic materials synthesis
  • Solid State Laser Technologies
  • Gold and Silver Nanoparticles Synthesis and Applications
  • Advanced Photocatalysis Techniques
  • Advanced materials and composites
  • Copper-based nanomaterials and applications
  • Aluminum Alloys Composites Properties
  • Photonic and Optical Devices
  • Metamaterials and Metasurfaces Applications
  • Mesoporous Materials and Catalysis
  • Supercapacitor Materials and Fabrication
  • Intermetallics and Advanced Alloy Properties
  • Photonic Crystals and Applications
  • TiO2 Photocatalysis and Solar Cells
  • Graphene research and applications
  • Polymer Surface Interaction Studies
  • Nanocluster Synthesis and Applications
  • Plasmonic and Surface Plasmon Research
  • ZnO doping and properties
  • Welding Techniques and Residual Stresses
  • Quantum Dots Synthesis And Properties
  • Pickering emulsions and particle stabilization
  • Advancements in Battery Materials

University of California, Riverside
2016-2025

University of Washington
2024

American Institute of Aeronautics and Astronautics
2024

Sichuan University
2024

Universitat de Barcelona
2023

Changchun University of Technology
2018-2022

University of California System
2018-2020

Riverside
2018-2020

Harbin Institute of Technology
2009-2019

Tianjin University
2005-2018

Plasmonic metal nanostructures have attracted considerable attention for solar energy harvesting due to their capability in photothermal conversion. However, the narrow resonant band of conventional plasmonic nanoparticles greatly limits application as only a small fraction can be utilized. Herein, unique confined seeded growth strategy is developed synthesize black silver with broadband absorption visible and near-infrared spectrum. Through this novel strategy, assemblages widely...

10.1021/acs.nanolett.8b04157 article EN Nano Letters 2018-12-18

Plasmonic nanomaterials with strong absorption at near-infrared frequencies are promising photothermal therapy agents (PTAs). The pursuit of high conversion efficiency has been the central focus this research field. Here, we report development plasmonic nanoparticle clusters (PNCs) as highly efficient PTAs and provide a semiquantitative approach for calculating their resonant frequency by combining effective medium approximation (EMA) theory full-wave electrodynamic simulations. Guided...

10.1021/acsnano.1c08485 article EN ACS Nano 2022-01-13

Abstract Visible‐light‐responsive reversible color‐switching systems are attractive to many applications because visible light has superior penetration and causes far less damage organic molecules than UV. Herein, we report that self‐doping of SnO 2− x nanocrystals with Sn 2+ red‐shifts their absorption the region simultaneously produces oxygen vacancies, which can effectively scavenge photogenerated holes thus enable color switching redox dyes using light. Wavelength‐selective also be...

10.1002/anie.201702563 article EN Angewandte Chemie International Edition 2017-05-16

In this work, a novel starch-based zwitterionic copolymer, starch-graft-poly(sulfobetaine methacrylate) (ST-g-PSBMA), was synthesized via Atom Transfer Radical Polymerization. Starch, which formed the main chain, can be degraded completely in vivo, and pendent segments of PSBMA endowed copolymer with excellent protein resistance properties. This ST-g-PSBMA could self-assemble into physical hydrogel normal saline, studies formation mechanism indicated that generation driven by electrostatic...

10.1021/acsami.6b03098 article EN ACS Applied Materials & Interfaces 2016-06-02

Creating highly branched plasmonic superparticles can effectively induce broadband light absorption and convert to heat regardless of the wavelength, angle, polarization. However, their direct synthesis in a controllable manner remains significant challenge. In this work, we propose strain modulation strategy produce Au nanostructures that promotes growth on seeds Volmer–Weber (island) mode instead typical Frank–van der Merwe (layer-by-layer) mode. The key is continuously deposit...

10.1021/jacs.1c11242 article EN Journal of the American Chemical Society 2021-11-23

Incorporating high-energy ultraviolet (UV) photons into photothermal catalytic processes may enable photothermal-photochemical synergistic catalysis, which represents a transformative technology for waste plastic recycling. The major challenge is avoiding side reactions and by-products caused by these energetic photons. Here, we break through the limitation of existing conversion mechanism propose photochromic-photothermal system based on polyol-ligated TiO2 nanocrystals. Upon UV or sunlight...

10.1002/anie.202308930 article EN Angewandte Chemie International Edition 2023-08-02

A 3D VFG-nanocup hybrid structured electrode shows great promise for future utilization in high-performance supercapacitors.

10.1039/c5ta01330e article EN Journal of Materials Chemistry A 2015-01-01

Quaternary ammonium salts are well-known zeolite structure-directing agents. However, cationic surfactants with quaternary head groups known to fail function as SDAs of zeolites because their long surfactant chains disrupt the ordered growth crystals. In this study, we found that ZSM-5 and silicalite-1 can be formed very easily appropriate synthesis compositions over a large temperature range 100-200 °C. The (13)C CP/MAS data for in combined elemental analysis indicated were more rigid,...

10.1039/c3dt53308e article EN Dalton Transactions 2013-12-11

A correlation exists between the degree of defects, wettability and supercapacitor properties VFG grown by PECVD.

10.1039/c4nr07284g article EN Nanoscale 2015-01-01

Great opportunities emerge not only in the generation of anisotropic plasmonic nanostructures but also controlling their orientation relative to incident light. Herein, a stepwise seeded growth method is reported for synthesis rod-shaped plasmon which are vertically self-aligned with respect surface colloidal substrates. Anisotropic metal nanostructure achieved by depositing seeds onto substrates and then selectively passivating seed induce symmetry breaking subsequent seed-mediated process....

10.1002/adma.201900789 article EN publisher-specific-oa Advanced Materials 2019-03-29

Abstract Engineering the nucleation and growth of plasmonic metals (Ag Au) on their pre‐existing seeds is expected to produce nanostructures with unconventional morphologies properties that may find unique applications in sensing, catalysis, broadband energy harvesting. Typical seed‐mediated processes take advantage perfect lattice match between deposited metal induce conformal coating, leading either simple size increases (e.g., Au or formation core–shell structures Ag limited morphology...

10.1002/anie.202105856 article EN Angewandte Chemie International Edition 2021-06-02

Pristine titanium dioxide (TiO2 ) changes color from white to black when it is reduced TiIV TiIII by photoexcited electrons. However, the coloration requires substantial light energy create, and vanishes instantaneously upon exposure air. This work reports synthesis of surface-functionalized N-doped TiO2 nanocrystals that rapidly change (i.e., within seconds) whitish under low-power irradiation with excellent stability in atmospheric conditions. The N-doping plays a critical role promoting...

10.1002/anie.202203700 article EN Angewandte Chemie International Edition 2022-05-05

Incorporating stimuli-responsive mechanisms into chiral assemblies of nanostructures offers numerous opportunities to create optical materials capable dynamically modulating their chiroptical properties. In this study, we demonstrate the formation superstructures by assembling Fe3O4@polyaniline hybrid nanorods using a gradient magnetic field. The resulting exhibit dual response changes in both field and solution pH, enabling dynamic regulation position, intensity, sign its circular dichroism...

10.1021/acsnano.3c06461 article EN ACS Nano 2023-09-05
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