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Surface-Activated Nanoparticles for Controlled Light-Responsiveness

Authors

  • Sungsook Ahn,

    Corresponding author
    1. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
    • Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea.
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  • Sung Yong Jung,

    1. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
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  • Sang Joon Lee

    Corresponding author
    1. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea
    2. Center for Biofluid and Biomimic Research, Pohang University of Science and Technology, Pohang, 790-784, South Korea
    3. Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, 790-784, South Korea
    • Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea.
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Abstract

Most of the optical properties of nanoparticles (NPs) depend on a nonadditive effect, where there is a maximum (or optimum) value at a specific distance from the NP surface (proximity length). However, knowledge on the relation between the specific surface layer and light responsiveness of NPs is limited. In this study, surface properties of NPs are modulated by electron beam (e-beam) treatment together with ionic control of the NP surface and dispersing media. The surface modification in terms of the proximity length is found to be critical to the selective enhancement of light absorbance in the ultraviolet-visible (UV-vis) and terahertz (THz) regions. In particular, the non-temporarily electron-activated NPs absorb short wavelength UV-vis light, rendering them particulary advantageous for solar energy use. The control over the physical properties of general light-responsive NPs is a new approach to designing solar-energy-based technologies.

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