In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 50, No. 42 ( 2021), p. 15380-15388
Abstract:
Molybdenum disulfide (MoS 2 ) nanosheets have been found to exhibit intrinsic peroxidase-like activity that could be applied in colorimetric sensing platforms. However, their poor conductivity and few exposed edge sites often lead to poor catalytic activity, impeding the application of MoS 2 nanosheets in enzyme-like catalysis. Here, a novel strategy was developed to selectively deposit Fe-doped MoS 2 nanosheets on polypyrrole microtubes to obtain Fe-MoS 2 @PPy microtubes to address these issues. In the synthesized Fe-MoS 2 @PPy microtubes, PPy microtubes can not only be used as a conductive support to promote the electron transfer, but also greatly alleviate the aggregations of MoS 2 nanosheets, and thus improve the enzyme-like activity. Meanwhile, additional active sites, formed by Fe doping, also endow the catalyst with excellent activity in enzyme-like catalysis. Notably, in the process of sulfidation, the dissolution, redistribution and diffusion result in the disappearance of MoO 3 @FeOOH cores and the formation of Fe doped MoS 2 nanosheets, which significantly facilitate the deposition of Fe-doped MoS 2 nanosheets on PPy microtubes. On the basis of the high peroxidase-like catalytic efficiency of the Fe-MoS 2 @PPy microtubes, a simple and convenient colorimetric strategy for the rapid and sensitive detection of l -cysteine has been developed. This strategy introduces both the PPy layer and Fe doping to increase the conductivity and the density of active sites of MoS 2 nanosheets, thus enhancing the catalytic activity and stability. More importantly, Fe-MoS 2 @PPy microtubes could be used as a good support for loading other materials such as Au and Ag nanoparticles (NPs), forming ternary Fe-MoS 2 /Ag, Au@PPy nanotubes. This work offers an opportunity to develop low-cost and highly active MoS 2 -based nanocomposites for promising potential applications in electrochemical energy conversion and medical diagnostics.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2001339-5
detail.hit.zdb_id:
1472887-4
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