Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 7, Issue 35, Pages 5412-5422Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tb00989b
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Funding
- Australian Research Council (ARC) [DP190102944, FT150100479]
- Australian Government Research Training Program (RTP) Scholarship (the University of Queensland)
- AINSE Limited
- Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah
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Nanozymes (nanoparticles with enzyme-like properties) have attracted considerable attention in recent years owing to their intrinsic enzyme-like properties and broad application in the fields of ELISA based immunoassay and biosensing. Herein, we systematically investigate the influence of crystal phases (gamma-Fe2O3 and alpha-Fe2O3) of mesoporous iron oxide (IO) on their peroxidase mimetic activity. In addition, we have also demonstrated the applicability of these mesoporous IOs as nanozymes for detecting the glucose biomarker with a limit of detection (LOD) of 0.9 mu M. Mesoporous gamma-Fe2O3 shows high nanozyme activities (and magnetism) toward the catalytic oxidation of chromogenic substances, such as 3,3 ',5,5 '-tetramethylbenzidine (TMB) and 2,2 '-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)-ABTS, as well as for the colourimetric detection of glucose, compared to that of alpha-Fe2O3. We believe that this in-depth study of crystal structure based nanozyme activity will guide designing highly effective nanozymes based on iron oxide nanostructures for chemical sensing, biosensing and environmental remediation.
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