Tuning the morphology of Cu-MOFs nanostructures for sensitive ascorbic acid sensing.
Zhuo WangShanyu LiYurun HuChenhuinan WeiHuihu WangXing XiangPublished in: Nanotechnology (2023)
Metal organic frameworks (MOFs) are an attractive platform to develop fascinating electrocatalysts for the oxidation of ascorbic acid, and their different morphologies have been hinted in literature to impact their sensing performance. In this work, by varying the reaction medium of metal source and organic ligand, copper 2-hydroxybenzene-1,4-dicarboxylate (CuBDC-OH) nanosheets, nanorods and bulk were generated. Thereinto, CuBDC-OH nanosheets displayed the highest sensitivity of 151.99 μA·mM-1·cm-2 in the linear range of 12-1074 μM, which is 1.5 times greater than that of CuBDC-OH nanorods and 3.5 times greater than that of CuBDC-OH bulk. The electrochemical analyses manifested that the superiority of nanosheets originated from higher oxidative current, larger electrochemical active surface area and lower charge transfer resistance, which enabling the efficient electro-oxidation of ascorbic acid. Additionally, satisfactory selectivity, stability and reproducibility were obtained.
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Keyphrases
- metal organic framework
- electron transfer
- gold nanoparticles
- reduced graphene oxide
- hydrogen peroxide
- ionic liquid
- molecularly imprinted
- systematic review
- label free
- high throughput
- high resolution
- nitric oxide
- mass spectrometry
- visible light
- neural network
- oxide nanoparticles
- single cell
- tandem mass spectrometry
- structural basis