Abstract
A 3D porous matrix makes an intriguing sensing platform, which can integrate functional guest molecules. Here, the first demonstration of a zinc compound/silicone hybrid foam is reported for amperometric sensing of glucose oxidase. The silicone foam is fabricated by a self‐developed solid‐filling‐melting method. Two zinc‐based polymers, Zn‐Compound‐1 and Zn‐Compound‐2, are synthesized. Zn‐Compound‐1 and Zn‐Compound‐2 are characterized by X‐ray diffraction, X‐ray photoelectron spectroscopy, Fourier‐transform infrared spectroscopy, Raman spectroscopy, and X‐ray absorption nearedge structure spectroscopy of carbon K‐edge, oxygen K‐edge, and zinc L‐edge. Effective amperometric sensing of glucose oxidase is achieved by introducing Zn‐Compound‐1 or Zn‐Compound‐2 into the silicone foam, i.e., an increase of the concentration of the glucose oxidase led to an increase of detected current. This phenomenon can be explained by a possible mechanism of the formation of electron extra bands.
Highlights
Introduction integrate functional guest moleculesHere, the first demonstration of a zincResearch interest in seeking simple, compound/silicone hybrid foam is reported for amperometric sensing of glucose oxidase
The simulated X-ray diffraction (XRD) profile was in good agreement with the experimental
We present an example of fabricating Zn-compound/silicone hybrid foams
Summary
The synthesis of Zn-Compound-1 and Zn-Compound-2 was done in a facile chemistry (see the Experimental Section). XANES, XPS, FTIR, and Raman spectroscopy would be used for further analysis of the amperometric sensing of Gox. Figure 3a shows the carbon K-edge XANES spectrum of a graphite foil with the absorption spectra of Zn-Compound-1 and Zn-Compound-2 samples. As presented in the section of XANES spectra, the Zn K-edge spectra of Zn-Compound-1 and Zn-Compound-2 show small resonant peaks in the spectra tail, which can be attributed to the defect states of the samples. Another evidence is from the measured XPS spectra for N 1s (see Figure S6, Supporting Information), which showed a peak at 403 eV. The consideration on these impacts is valuable and paves the way for our future endeavor in practical application of amperometric sensing of glucose oxidase using the Zn-compound filled silicone foam
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