4.7 Article

The effect of activation pretreatment on the morphology of Ag microsphere and the microwave absorption performances of Ag@MWCNTs hybrids

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 870, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159368

Keywords

Activation; Electroless plating; Silver shells; Morphology; Microwave absorbing properties

Funding

  1. Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University
  2. China [CX201964]

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This study demonstrated the preparation of silver microspheres with controllable morphology and structure for constructing absorbing hybrids. Results revealed that activation and plating solution concentration played crucial roles in enhancing the microwave absorbing performances of the hybrids.
The silver microspheres with controllable morphology and structure were prepared by electroless plating with activated PS microspheres as template, which were used to construct a 3D absorbing hybrids of Ag@ MWCNTs. The SEM and EDS results illustrated that a uniform silver shell was coated on the surface of PS microsphere because of the activation, which was conductive to construct an excellent conductive network to attenuate electromagnetic wave. Meanwhile, the plating solution concentration had an important effect on the morphology of Ag microsphere and microwave absorption performances of the absorbing hybrids. When the concentration was 12 g/L, the silver shell of B-2 microsphere was uniform and dense. However, lower or higher concentration were unfavorable to the integrity of Ag shell of B-1 and B-3 microsphere. For the B-2@MWCNTs absorbent hybrids, the reflection loss value was -37.00 dB at 9.9 GHz, while that of B-1@ MWCNTs and B-3@MWCNTs hybrids were -27.35 dB at 8.5 GHz and -24.07 dB at 11.3 GHz, respectively. All the results indicated that the controlling measures of activation for PS microspheres and proper plating solution concentration are crucial to enhance the microwave absorbing performances of absorbing hybrids. (c) 2021 Elsevier B.V. All rights reserved.

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