Kinetics of photo-stimulated adsorption of enzyme molecules onto n- and p-type silicon

We report on a change in the surface density of glucose oxidase (GOx) molecules on surface of Si/SiO2/polyethyleneimine structures depending on type of Si conductivity, adsorption time and white-light illumination of a substrate during GOx adsorption. It is clearly shown by AFM images that the depen...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-12, Vol.699 (1), p.12022
Main Authors: Kozlowski, A V, Stetsyura, S V
Format: Article
Language:English
Subjects:
Adsorption
Glucose oxidase
Illumination
Polyethyleneimine
Silicon dioxide
Silicon substrates
Surface charge
Surface chemistry
White light
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Summary:We report on a change in the surface density of glucose oxidase (GOx) molecules on surface of Si/SiO2/polyethyleneimine structures depending on type of Si conductivity, adsorption time and white-light illumination of a substrate during GOx adsorption. It is clearly shown by AFM images that the dependence of GOx adsorption on adsorption time and illumination is different for n-Si and p-Si substrates. The results can be explained by the electrostatic interaction between GOx molecules and the surface charge of Si, which depends on illumination.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/699/1/012022