Abstract
Mulberry-like AuPtAg porous hollow nanorods (PHNR) were facilely synthesized for the first time via a wet chemical method, where Au nanorods (Au NR) behaved as sacrificed template. The anisotropic oriented growth and etching process are involved in this synthesis. Their structural and electronic characteristics were scrutinously examined by TEM, EDS, XPS, and electrochemical techniques. The AuPtAg PHNR provided a large specific surface area and exposed a large number of active sites, showing highly enhanced catalytic activity. On this foundation, a label-free electrochemical immunosensor was developed for myoglobin (Myo) assay based on the AuPtAg PHNR. Further, the built sensor exhibited fast and ultrasensitive responses in a linear range of 0.0001 ~ 1000 ng mL−1 with a low limit of detection (LOD = 0.46 pg mL−1, S/N = 3), and enabled efficient application to human serum samples with acceptable results. Consequently, the developed AuPtAg PHNR–based platform has a broad prospect in practically monitoring Myo and other biomarkers in clinics.
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This research was supported by Zhejiang Public Welfare Technology Application Research Project (LGG19B050001).
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Research Highlights
• AuPtAg PHNR was prepared for the first time by using Au NR as sacrificed template.
• The anisotropic oriented growth and etching process were involved.
• The AuPtAg PHNR provided a large specific surface area, attractive electronic effects and high catalytic activity.
• The immunosensor showed excellent performances for ultrasensitive detection of Myo.
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Tang, C., Wang, AJ., Feng, JJ. et al. Mulberry-like porous-hollow AuPtAg nanorods for electrochemical immunosensing of biomarker myoglobin. Microchim Acta 190, 233 (2023). https://doi.org/10.1007/s00604-023-05802-2
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DOI: https://doi.org/10.1007/s00604-023-05802-2