Synthesis of bimetallic core/shell nanoparticles via pulse laser ablation and their catalytic effectiveness in dye degradation

被引:1
|
作者
Siddiq, Muhammad [1 ]
Rehman, Zia Ur [2 ]
Rasheed, Muhammad Asim [1 ]
Ul Hassan, Syed Mujtaba [3 ]
Qayyum, Hamza [4 ]
Mehmood, Sultan [2 ]
Qayyum, Abdul [2 ]
机构
[1] Pakistan Inst Engn & Appl Sci PIEAS, Dept Phys & Appl Math, Islamabad 45650, Pakistan
[2] Pakistan Inst Nucl Sci & Technol, Phys Div, Islamabad 45650, Pakistan
[3] Pakistan Inst Engn & Appl Sci PIEAS, Dept Met & Mat Engn, Nilore 45650, Pakistan
[4] COMSATS Univ Islamabad, Dept Phys, Laser Matter Interact Lab, Pk Rd, Islamabad 45550, Pakistan
关键词
bimetallic core/shell nanoparticles; laser ablation; catalytic performance; AG ALLOY NANOPARTICLES; AU; GOLD;
D O I
10.2351/7.0001347
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, a simple two step method is employed to sequentially synthesize bimetallic core/shell nanoparticles (NPs). In the first step, pure mono Au and Ag NPs are prepared via 1064 nm pulsed laser ablations in liquid. In the second step, the Au/Ag substrate immersed in the Au/Ag colloidal solution is exposed to the nanosecond laser at 1064 nm wavelength using various laser energies and ablation periods. The crystalline phase and morphology of the bimetallic core/shell NPs (Au/Ag, Ag/Au) are examined by x-ray diffraction and scanning electron microscopy, respectively. The results showed that highly crystalline, well-dispersed spherical monometallic and bimetallic core/shell NPs can be synthesized via pulse laser ablation in liquid. The average diameter of Au, Ag, Au/Ag, and Ag/Au NPs is 34, 40, 58, and 43 nm, respectively. With increasing laser energy, the plasmonic absorption peak of Au NPs redshifts and that of Ag NPs blueshifts. For core/shell, two plasmonic peaks were observed, each of which shifted with increasing ablation time for shell material. Organic dyes with concentrations of 10 (- 5) M of methylene-blue with NaBH4 of 0.05M and methylene-orange with NaBH4 of 0.1M are used to examine the catalytic performance of the NPs. The core/shell NPs performed better than monometallic NPs. In particular, the catalytic degradation efficiency of Au/Ag and Ag/Au NPs is approximately 90% in significantly less time than monometallic Au and Ag NPs.
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页数:10
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