Magnetic microspheres with polydopamine encapsulated ultra-small noble metal nanocrystals as mimetic enzymes for the colorimetric detection of H₂O₂ and glucose

Abstract

A novel sandwich-structured magnetic microsphere with ultra-small noble metal nanocrystals as a mimetic enzyme for the colorimetric detection of H2O2 and glucose.

Zero-Dimensional/Two-Dimensional AuxPd100–x Nanocomposites with Enhanced Nanozyme Catalysis for Sensitive Glucose Detection

“…As shown in Table S3, for comparison, Au 21 Pd 79 also displayed comparable or better performance than other ultrathin materials like graphene oxide (GO), layered double hydroxides (LDHs, e.g., Ni–Fe) and metal dichalcogenides (e.g., MoS 2 , WS 2 , WSe 2 , and VS 2 ) as well as supported NSs including Fe–Pd NP-coated reduced GO, Pt nanodot-modified Pd NSs, metal NPs (e.g., Pd, Au and Au–Ni) decorated graphitic carbon nitride (g-C 3 N 4 ) NSs, and Co–Fe LDH NS/CeO 2 nanotube hybrids . Besides, Au 21 Pd 79 gave lower LOD value compared with those of several core–shell nanocomposites, such as Au@TiO 2 , MoS 2 @MgFe 2 O 4 , Fe 3 O 4 @RF-M@PDA, and Cu@Au/Pt …”

Pd Nanoclusters Confined in ZIF-8 Matrixes for Fluorescent Detection of Glucose and Cholesterol

“…The metal NPs with subnanometer-scale sizes (<2 nm) are endowed with great catalytic efficiency and substrate specificity. Nevertheless, the noble metal NPs with subnanometer sizes are disposed toward spontaneous aggregation because of their high surface energy, which challenges their preparation and structure regulation and thereby severely limits their application. − In order to address these deficiencies, various strategies have been investigated. Li et al synthesized 4.8 nm Pd NPs by using cytosine-rich oligonucleotides as a stabilizer, showing a K m of 91.29 mM toward H 2 O 2 and 0.03 mM toward TMB .…”

Facile preparation of Fe 3 O 4 @Pt nanoparticles as peroxidase mimics for sensitive glucose detection by a paper-based colorimetric assay

“…Figure 3 d shows the Pt 4f XPS spectrum of Fe 3 O 4 @Pt NPs. After curve fitting, the spectrum consisted of two pairs of peaks: peak 1 ≈ 71.0 eV, peak 3 ≈ 74.3 eV, peak 2 ≈ 72.4 eV and peak 4 ≈ 75.7 eV, which belong to Pt(0) and Pt 2+ , respectively [ 45 ]. The XPS results were consistent with those from TEM, XRD and EDS mapping.…”