Hydrogels were synthesized by the two-step method at ambient temperature (~293 K), i.e., the preparation of NP solutions and the following gelation. As an example, the aqueous solution of trisodium citrate dehydrate (400.0 mM, 25.0 μl), HAuCl4·3H2O (32.5 mM, 30.8 μl), and NaBH4 (200.0 mM, 20.0 μl) were added successively to 4.93 ml of water and stirred for 30 to 60 min. After aging for ~1 day, NH4F (1.0 M, 555.0 μl) solution was added, and the mixture was subsequently grounded for 4 to 12 hours to acquire the hydrogel. After washing with water and exchanging with tert-butanol, the corresponding aerogel was obtained by freeze-drying for ~24 hours.

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