Pd(acac)2 (Pd 34.9%, Macklin) and HAuCl4·3H2O (99.9%, Aladdin), Chloro(triphenylphosphine)gold(I) (AuPPh3Cl, 99%, Aladdin), N, N-dimethylformamide (DMF, 99.7%, Macklin), Tetrabutylammonium bromide (TBAB, 99%, Aldrich), Potassium titanium oxalate (C4H2K2OTi, 99%, Macklin), 1, 2-dichloropropane (99%, Macklin), 4-tert-butylpyridine (99%, Macklin), Poly(vinylpyrrolidone) (PVP, ~ 29000, Aldrich), Oleylamine (OM, 70%, Aldrich) and L-ascorbic acid (AA, 99.5%, Aldrich) and Carbon blacks (xc-72c, Macklin) were used. High-purity water (H2O, 18.3 MΩ cm) was employed for all experiments.
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