Au@Pt

Materials

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BET
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159Au@Pt50nmTEMA typical TEM image (Fig. 3) showed that the Au@Pt nanozymes were relatively uniform in size and similar in structure, and the diameter of the nanoparticles was approximately 50 nm. As a uniform porous structure, Pt NPs formed a branched structure on the surface ofAu. The particle size ofthe Au corewas approximately 30e35 nm, and the average diameter of the Pt NPs was approximately 5e10 nm.
621Au@PtTEMFrom the results of TEM and UV–visible spectroscopy characterizations (Fig. 2), lots of spiny Pt nanostructures can be found on the smooth surface of AuNRs (D = 21 nm and L = 74 nm)
735Au@PtTEMThe average length and width of the AuNRs were calculated to be 43.3 4.9 nm and 11.2 2.3 nm respectively (Fig. S1a and b, ESI†). The Pt nanodots were wrapped on the surface of the AuNRs homogeneously and formed a rough shell, as observed from Fig. 1b and c and Fig. S2b–d (ESI†). The average length and width were 57.9 4.9 nm and 14.5 2.6 nm respectively (Fig. S1c and d, ESI†). The HR-TEM image of Au@Pt nanorods (Fig. 1d) showed clear lattice distances of 0.224 nm and 0.231 nm, which can be assigned to the (111) planes of crystalline Pt and Au.
752Au@PtnmDLSThe formation of the spiky Pt layer on GNP seeds resulted in the increase of the hydrodynamic diameter from 22.2 ± 5.2 to 54.9 ± 12.2 nm

Kinetics

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39Au@PtCATH2O2509.9mM72.5μM/min362.31/min3939
159Au@PtPODH2O24.076-3mM6.013-8M/s2.00431/s159The apparent Km values for Au@Pt nanozyme were about 80e600 times smaller than that ofHRP, which indicated that the affinity between TMB/H2O2 and Au@Pt nanozyme was stronger than that between HRP and TMB/H2O2. Moreover, the Kcat values for Au@Pt nanozyme were about 80e340 times higher than that of HRP, which indicated that the catalytic efficiency of Au@Pt nanozyme was stronger than that of HRP
159Au@PtPODTMB2.431-3mM4.425-8M/s1.47531/s159
621Au@PtPOD621621
752Au@PtPODH2O25.75mM1.28-6M/s752

Applications

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159Au@PtAu@Pt nanozymes were introduced to develop a low-cost, rapid, visual and highly sensitive immunochromatographic assay for streptomycin detectionstreptomycinColor0.06ng/ml
159Au@PtAu@Pt nanozymes were introduced to develop a low-cost, rapid, visual and highly sensitive immunochromatographic assay for streptomycin detectionstreptomycinColor0.06ng/mlThe qualitative LOD was 0.1 ng mL−1 by the naked eye, and the quantitative LOD was 0.06 ng mL−1.
621Au@PtAg+ detection by LSPR spectroscopyAg+Color0.5-1000μM500nM
735Au@Pthighly sensitive sensing of matrix metalloproteinase 2MMP-2E-chem0.5–100ng/mL0.18ng/mL96.1 to 104.4%
752Au@PtThe developed approach was used for reaching a lower limit of detection (LOD) and eliminating the background for the lateral flow immunoassay (LFIA) of the important plant pathogen potato virus X (PVX) in leaf and tuber extracts.31pg/ml

References

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159Using bimetallic Au@ Pt nanozymes as a visual tag and as an enzyme mimic in enhanced sensitive lateral-flow immunoassays: Application for the detection of streptomycinhttps://doi.org/10.1016/j.aca.2020.06.009Multi-metalAu@Pt
735AH 2 O 2-free electrochemical peptide biosensor based on Au@ Pt bimetallic nanorods for highly sensitive sensing of matrix metalloproteinase 2https://doi.org/10.1039/D0CC01598AMulti-metalAu@Pt bimetallic nanozyme
621Peroxidase-like Au@ Pt nanozyme as an integrated nanosensor for Ag+ detection by LSPR spectroscopyhttps://doi.org/10.1016/j.talanta.2020.121627Multi-metalAu@Pt nanozyme
752The steadfast Au@ Pt soldier: Peroxide-tolerant nanozyme for signal enhancement in lateral flow immunoassay of peroxidase-containing sampleshttps://doi.org/10.1016/j.talanta.2020.121961Multi-metalAu@Pt