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The AuNSTs were coated with mesoporous silica (mSiO2) via a robust approach, producing the AuNSTs@mSiO2 nanoparticles (NPs) with tunable thicknesses and consistent optical properties for a range of morphologies. The NPs were additionally coated with platinum (Pt) before synthesizing the mSiO2 layer, facilitating a comparative analysis of catalytic activity. The catalytic performance of the bare AuNSTs, the AuNSTs@mSiO2, and the AuNSTs@Pt@mSiO2 was evaluated through methylene blue reduction, confirming the gold core as the primary catalytic source. The AuNSTs@Pt@mSiO2 exhibited enhanced activity, highlighting the potential of the mSiO2 coatings. Additionally, solid-phase catalytic tests using 3,3\u2032,5,5\u2032-tetramethylbenzidine (TMB) on cellulose discs demonstrated the effectiveness of these NPs under diverse conditions. 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