Synthesis of RGO/Cu₈S₅/PPy Composite Nanosheets with Enhanced Peroxidase-Like Activity for Sensitive Colorimetric Detection of H₂O₂and Phenol

Abstract

In this paper, a novel strategy for the fabrication of reduced graphene oxide (rGO)/Cu8S5/polypyrrole (PPy) composite nanosheets with Cu8S5 nanoparticles and PPy layer anchored on the surface of rGO as peroxidase‐like nanocatalyst is reported. During the synthesis, graphene oxide (GO)/CuO composite nanosheets are prepared first and used as templates, then the sulfuration of CuO and polymerization of pyrrole are accompanied with the reduction of GO, resulting in ternary rGO/Cu8S5/PPy composite nanosheets. The synthesized Cu8S5 nanoparticles with a diameter in the range from tens to hundreds of nanometers are dispersed within PPy decorated rGO nanosheets. The resultant ternary rGO/Cu8S5/PPy composite nanosheets exhibit a higher peroxidase‐like catalytic activity toward the oxidation of 3,3′,5,5′‐tetramethylbenzidine in the presence of H2O2 than GO/CuO and rGO/CuS composite nanosheets, revealing a synergistic effect on their activity. The as‐prepared rGO/Cu8S5/PPy platform provides a simple colorimetric approach for the detection of H2O2 and phenol with a high sensitivity. This work offers a new way for the fabrication of rGO‐based nanocomposite with superior enzyme‐like activity, which displays great potential applications in biocatalysis and environmental monitoring.

Enhanced Photocatalytic Hydrogen Production of the Polyoxoniobate Modified with RGO and PPy

“…The peak at 1398 cm −1 is assigned to the C-O stretching vibration due to π-π interaction between PPy and RGO. The peak at 1637 cm −1 is assigned to H-O-H stretching vibration and the peak at 1258 cm −1 was assigned to C-H and C-N in-plane deformation vibration, further implying the combination of GO with PPy [52,53]. The characteristic peaks at 840 and 887 cm −1 could be attributed to the terminal Nb-O stretching vibration, and the peaks appearing at 532 and 597 cm −1 correspond to Nb-O-Nb bonds [54].…”

Conducting polymer-based peroxidase mimics: synthesis, synergistic enhanced properties and applications

“…With regard to conducting polymer-based nanocomposites as peroxidase mimics, a colorimetric determination of phenol can be developed based on the formation of quinone imine complex. For instance, we have prepared rGO/Cu 8 S 5 /PPy nanocomposites through a two-step approach [113]. Firstly, GO/CuO composite nanosheets were prepared via a wet-chemical approach.…”

2D/2D h‐BN/N‐doped MoS2 Heterostructure Catalyst with Enhanced Peroxidase‐like Performance for Visual Colorimetric Determination of H2O2

“…WO 3 nanosheets Colorimetric 1-180 0.65 [36] N-GODs Colorimetric 20-1170 5.3 [14] MoS 2 nanosheets Colorimetric 5-100 1.5 [38] CeÀ MoS 2 Colorimetric 1-50 0.47 [35] RGO/Cu8S5/PPy composite nanosheets Colorimetric 0-20 0.69 [39] Au@Ag heterogeneous nanorods Colorimetric 10-10000 6.0 [40] Fe-NGCs Electrochemical 1-5000 0.53 [41] HRP/BN/WS 2 / AuNPs Electrochemical 150-15010 3000 [42] RGO/CuS/Au composite nanosheets SERS 3.05-50 2.1 [43] BM…”