Bio-directed synthesis of platinum nanoparticles by Nymphaea alba extract: fabrication of a novel non-enzymatic hydrogen
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Bio-directed synthesis of platinum nanoparticles by Nymphaea alba extract: fabrication of a novel nonenzymatic hydrogen peroxide sensor Ahmad Reza Mohamadi1, Navabeh Nami1, and Banafsheh Norouzi1,* 1
Department of Chemistry, Islamic Azad University, Qaemshahr Branch, Qaemshahr, Iran
Received: 24 May 2020
ABSTRACT
Accepted: 4 September 2020
In this work, the extract of Nymphaea alba flowers was used as a reducing agent to synthesize platinum nanoparticles (Pt NPs), being such NPs characterized by different methods such as XRD, SEM and FT-IR. Crystal size of prepared Pt NPs was determined by SEM round circa 35 nm. Such characterized NPs were then applied to modify carbon paste electrodes (CPE/Pt NPs), which were electrochemically investigated by cyclic voltammetric method. The active surface area of CPE/Pt NPs was calculated about 0.027 cm2. Finally, the ability of this modified electrode was assessed to determine of hydrogen peroxide by amperometric technique. This modified electrode has shown a linear dynamic range of 1.5–250 lmol L-1 with detection limit of 0.7 lmol L-1. In addition, the electron transfer coefficient for hydrogen peroxide at the surface of CPE/Pt NPs was found to be 0.74. The simple preparation method, low costs (free enzyme), good stability, and efficient response are the advantages of this novel modified electrode as a sensor for determination of hydrogen peroxide.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Synthesis of noble metal nanoparticles (NPs) such as Pt, Pd, Au, Ag and etc. is too important. They have numerous applications in different fields such as sensing, catalysis, low temperature fuel cells, biomedicine and cancer therapy due their unique sizeand shape-dependent optoelectronic properties [1–3]. Up to now, the different methods such as sol–gel, micro-emulsion, hydrothermal, sonochemical, chemical reduction and green synthesis methods, or a combination of these methods have been used for the
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https://doi.org/10.1007/s10854-020-04413-4
synthesis of Pt NPs. Each of these methods has its own advantages and features [4]. Biosynthesis of metal NPs using plant materials is a suitable alternative to chemical and physical methods. The main advantages of this approach are low cost, simplicity, easy, and environment friendly process. It does not involve energy intensive operational conditions like high temperature, pressure and etc. The phytochemical constituents present in the extracts of the plants may act both as reducing and capping agents in NP synthesis [5].
J Mater Sci: Mater Electron
On the other hand, the determination of hydrogen peroxide has specific importance in various fields such as foods and agriculture products [6, 7], chemical and biochemical industry [8–11], clinical control [12–14], environmental protection [15, 16], cosmetic and pharmaceutical components [17] and fuel cells [18, 19]. Furthermore, hydrogen peroxide as strong oxidant is used for medical and pharmace
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