Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology

Hangzhou, China

Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology

Hangzhou, China

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Mao A.,Anhui University of Technology | Ding M.,Anhui University of Technology | Jin X.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | Gu X.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | And 3 more authors.
Journal of Molecular Structure | Year: 2015

A facile synthetic method for monodisperse copper nanoparticles (CuNPs) has been reported, in which sodium hyposulphite works as reducing agent and gelatin serves as capping agent. Water-dispersed CuNPs have been produced without any protective atmosphere at room temperature. The as-prepared samples are characterized by ultraviolet-visible spectroscopy, transmission electron microscopy, X-ray diffraction and Raman spectra. The results show that the quasi-spheres and phase-pure crystalline CuNPs with a diameter of 32 ± 3 nm can be quickly obtained by adjusting the amount of NaOH solution and quantity of gelatin. The present work suggests a great potential of using obtained CuNPs colloidal as an efficient substrate for surface-enhanced Raman scattering signals.


Mao A.,Anhui University of Technology | Mao A.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | Jin X.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | Gu X.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | And 2 more authors.
Journal of Molecular Structure | Year: 2012

Single-crystal silver (Ag) nanocubes have been synthesized by a rapid and green method at room temperature by adding sodium hydroxide solution to the mixed solutions of silver nitrate, glucose and polyvinylpyrrolidone (PVP). The X-ray diffraction (XRD), ultraviolet-visible (UV-visible) and transmission electron microscopy (TEM) were used to characterize the phase composition and morphology. The results showed that the as-prepared particles were single-crystal Ag nanocubes with edge lengths of around 77 nm and a growing direction along {1 0 0} facets. As substrates for surface-enhanced Raman scattering (SERS) experiment on crystal violet (CV), the SERS enhancement factor of the as-prepared Ag nanocubes were measured to be 5.5 × 104, indicating potential applications in chemical and biological analysis. © 2012 Elsevier B.V. All rights reserved.


Yang J.,Zhejiang University of Technology | He Y.,Zhejiang University of Technology | Qin C.,Zhejiang University of Technology | Zhao W.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | And 2 more authors.
Materials and Design | Year: 2015

A typical Ni-Mo-Cr superalloy with basic composition of Ni-17Mo-7Cr (wt.%) was fabricated and the relationship between the microstructure and mechanical properties while it underwent simulated heat-affected zone thermal cycle (HAZ) treatment was investigated. The results show that the Ni-Mo-Cr alloy was mainly made up of Ni based solid solution and MoC carbides. The critical peak temperature that a unique lamellar-like structure occurred in the alloy was found to be 1300. °C, and they were firstly determined to be Ni matrix and carbides (MoC and chromium carbides) generated through local melting. Due to the formation of unique structure, the alloy exposed to HAZ thermal cycle with a peak temperature of 1300. °C could still maintain excellent high-temperature mechanical performance. The work carried out here will provide valuable guidelines in designing and applying the Ni-Mo-Cr series superalloys. © 2015 Elsevier Ltd.


Jin X.,Zhejiang Province Key Laboratory of Soldering and Brazing Materials and Technology | Mao A.,Anhui University of Technology | Mao A.,Anhui Ruital New Material Technology Co. | Ding M.,Anhui University of Technology | And 5 more authors.
Applied Spectroscopy | Year: 2016

Water-dispersed Cu@Ag core-shell nanoparticles (NPs) with 15 nm-diameter Cu core and 5 nm-thick Ag shell can be synthesized by a facile one-step chemical reduction at room temperature without any protective atmosphere. To obtain a homogeneous Ag coating on Cu, the influence of [Cu/Ag] molar ratio was investigated. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) confirmed that Ag formed a dense coating on the surface of Cu, and that phase-pure spherical Cu@Ag core-shell bimetallic NPs were prepared when the [Cu/Ag] molar ratio was between 1/0.5 and 1/0.75. The time dependence of ultraviolet-visible (UV-Vis) spectra and XRD patterns of six-month stored Cu@Ag NPs showed that the as-prepared Cu@Ag NPs have a long-term antioxidant activity. Also, the surface-enhanced Raman scattering (SERS) signals had a high stability and reproducibility for the substrates. Hence, the as-prepared Cu@Ag nanostructures can be used as an efficient substrate for SERS signals. © Society for Applied Spectroscopy.

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