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A NOVEL SYNTHESIS METHOD FOR SILVER NANOPARTICLES USING MOLTEN ε-CAPROLACTAM AS SOLVENT AND REDUCING AGENT

Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People's Republic of China

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HOUSHENG XIA

Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People's Republic of China

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, and

GUISHENG YANG

Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People's Republic of China

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https://doi.org/10.1142/S1793292014500854Cited by:0 (Source: Crossref)

Abstract

A precipitation–reduction synthesis method for silver nanoparticles (Ag NPs) was developed. Molten ε-caprolactam (CL) was used not only as solvent but also as reducing agent and stabilizer. At first, Ag₂O NPs was prepared by precipitation reaction of silver nitrate (AgNO₃) and sodium hydroxide (NaOH) using molten CL as solvent at 100°C. Then, Ag₂O NPs was in situ reduced into Ag NPs by molten CL at 120°C. Techniques of X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to monitor the synthesis process. With the increase of reduction time, monodispersed Ag₂O NPs (ca. 3.7 nm) were integrated and larger Ag NPs (10–90 nm) were formed. Fourier transform infrared (FT-IR) results showed that the surface of Ag NPs was capped with about 0.9 wt.% of CL molecules. Surface enhanced Raman scattering (SERS) effect of Ag NPs was investigated using Rhodamine 6G as a probe molecule.

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