One‐Pot Synthesis of Algae‐Like MoS₂/PPy Nanocomposite: A Synergistic Catalyst with Superior Peroxidase‐Like Catalytic Activity for H₂O₂ Detection

Abstract

has a direct bandgap of 1.8 eV due to the 2D structure. [ 11 ] This unique feature brings few layer MoS 2 signifi cant improvement in optical, electronic, and mechanical properties. And the few layer MoS 2 nanosheets have been attracted great interest and applications in catalysis, [ 12 ] phototransistors, [ 13 ] solar cells, [ 14 ] lithium ion batteries, [ 15 ] electrocapacitor, [ 16 ] and fi eld emission, [ 17 ] etc. Polypyrrole (PPy) is one of the most frequently studied conducting polymers in the past few decades due to its high conductivity, high storage ability, good thermal and environmental stability, high redox and capacitive current, and excellent biocompatibility. [ 18 ] Furthermore, the synthesis and purifi cation of PPy are relatively easy. It has been reported that PPy and its derivatives could be synthesized through both chemical and electrochemical polymerization approaches in either organic or aqueous acid media. [ 19 ] Recently, PPy nanoparticles have been reported to exhibit intrinsic peroxidase-like activity, which could be employed for quantitative detection of H 2 O 2 generated by macrophages. [ 20 ] In addition, PPy and other types of conducting polymers have also be found to participate in the peroxidase-like reaction and enhance the catalytic performance. [ 21 ] In this work, we for the fi rst time prepared algae-like MoS 2 / PPy nanocomposite in a one-pot reaction. The MoS 2 /PPy nanocomposite was prepared using a hydrothermal route to have direct oxidation polymerization of pyrrole in the presence of ammonium tetrathiomolybdate, which of the obtained PPy could in situ well-distributed grown on the surface of MoS 2 sheets. We also show the peroxidase-like activity of MoS 2 /PPy nanocomposite toward the oxidation of peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to produce a blue color. In addition, a comparative catalytic activity has been made with that of the independent MoS 2 and PPy nanomaterial, which revealed that the synergistic coupling effect between few layer MoS 2 nanosheets and PPy component contributed the enhanced catalytic activities.

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

“…Figure c showed the fine spectrum of O 1s which peak centered at 531.8 eV, which might be related to oxygen in OH groups. Figure d showed the appearance of NH and N with their characteristic peaks at ≈398.4 and 400.0 eV, indicating that PPy were formed on the surface of rGO nanosheets . The high‐resolution C 1s spectrum of XPS shown in Figure e could be deconvoluted into four components, with binding energies at 284.6, 285.7, 286.4, and 288.5 eV as the same with the above‐mentioned in Figure d.…”

Peroxidase‐Like Activity of Smart Nanomaterials and Their Advanced Application in Colorimetric Glucose Biosensors

“…The intrinsic peroxidase‐like activity of metal sulfide‐based nanomaterials including ZnS nanoparticles (ZnS NPs), MoS 2 nanoparticles, nanoflakes, and nanosheets (MoS 2 NPs, MoS 2 NFs, and MoS 2 NSs), nanostructured FeS, CuS nanoparticles (CuS NPs), VS 2 nanosheets (VS 2 NSs), and WS 2 nanosheets (WS 2 NSs), are widely explored and applied to various applications. Molybdenum disulfide (MoS 2 ), as one of the typical 2D layered transition metal dichalcogenides (2D‐TMDs), has been widely used in many applications including biosensor, catalysis, and electronic devices due to its electronic properties and unique structure.…”

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

“…For example, sheet-like FeS nanomaterials [66], CuS nanoparticles [67], MoS 2 nanosheets [68], and CoS nanospheres [69] have been investigated as efficient peroxidase mimics. In order to further increase the peroxidase-like property and extend their applications, the combination of conducting polymers with metal sulfides has been regarded as an available solution [70,71]. Our group first demonstrated a novel approach to decorate Cu 9 S 5 nanocrystals on the surface of PANI nanowires as peroxidase mimics [70].…”