4.7 Article

Engineering Au Nanoclusters for Relay Luminescence Enhancement with Aggregation-Induced Emission

Journal

NANOMATERIALS
Volume 12, Issue 5, Pages -

Publisher

MDPI
DOI: 10.3390/nano12050777

Keywords

luminescent gold nanoclusters; aggregation-induced emission; relay luminescence enhancement; thermosensitive polymer; self-assembly

Funding

  1. Industry-University-Research (IUR) Project of Ministry of Education [202002292014]
  2. Science and Technology Project of Henan Province [212102310511]
  3. Scientific Research Fund of Henan Provincial Education Department [21A150032]
  4. Ministry of Education, Singapore [R-279-000-580-112, R-279-000-538-114]
  5. National Natural Science Foundation of China [21871069, 51873050]
  6. China Scholarship Council

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The research discusses the relay luminescence enhancement of luminescent Au nanoclusters (Au NCs) through aggregation-induced emission (AIE), as well as the emergence of reduced aggregation-caused luminescence by adjusting the temperature of the Au NC solution. By attaching a thermosensitive polymer on the surface of Au NCs, the optical properties can be manipulated for practical applications.
The research of aggregation-induced emission (AIE) has been growing rapidly for the design of highly luminescent materials, as exemplified by the library of AIE-active materials (or AIEgens) fabricated and explored for diverse applications in different fields. Herein, we reported a relay luminescence enhancement of luminescent Au nanoclusters (Au NCs) through AIE. In addition, we demonstrated the emergence of reduced aggregation-caused luminescence by adjusting the temperature of the Au NC solution. The key to induce this effect is to attach a thermosensitive polymer poly(N-isopropylacrylamide) (PNIPAAm) on the surface of Au NCs, which will shrink at high temperature. More interestingly, the as-synthesized Au NCs-PNIPAAm can self-assemble into vesicles, resulting in an obvious decrease in the luminescence intensity in aqueous solution. The combination of relay luminescence enhancement (by AIE) and luminescence decrease (induced by thermosensitive polymers) will be beneficial to the understanding and manipulation of the optical properties of Au NCs, paving the way for their practical applications.

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