A novel and ultrasensitive sandwich-type electrochemical immunosensor based on delaminated MXene@AuNPs as signal amplification for prostate specific antigen (PSA) detection and immunosensor validation
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CitationMedetalibeyoglu, H., Kotan, G., Atar, N., & Yola, M. L. (2020). A novel and ultrasensitive sandwich-type electrochemical immunosensor based on delaminated MXene@AuNPs as signal amplification for prostate specific antigen (PSA) detection and immunosensor validation. Talanta, 220(1), 121403. https://doi.org/10.1016/j.talanta.2020.121403
In this study, an ultra-sensitive electrochemical immunosensor for PSA detection was designed. Firstly, gold nanoparticles (AuNPs)/p-aminothiophenol (ATP) functionalized graphene oxide (GO) composite (AuNPs- ATPGO) was constructed and modified to glassy carbon electrode (AuNPs-ATPGO/GCE). AuNPs-ATPGO/GCE was utilized as immunosensor platform to increase the amount of PSA antibody1 (Ab1). After that, self- assembled delaminated MXene-gold nanoparticles (d-Ti3C2TX MXene@AuNPs) was used to label PSA seconder antibody2 (Ab2) as signal amplification. The prepared AuNPs-ATPGO, d-Ti3C2TX MXene@AuNPs and electro-chemical immunosensor was charecterized by electrochemical impedance spectroscopy (EIS), cyclic voltam-metry (CV), scanning electron microscope (SEM), x-ray diffraction (XRD) method, x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR). The linearity range and detection limit (LOD) were obtained as 0.01–1.0 pg mL-1 and 3.0 fg mL-1, respectively.