Direct Femtosecond Laser Processing of Gold-silver Alloy Nanostructure by Photoreduction†

doi:10.7503/cjcu20150109

Abstract

Abstract:

Gold-silver(Au-Ag) alloy nanostructures were fabricated on substrate by the highly intense femtosecond laser pulses through a wet photochemical reduction without introducing additional reducing agent. The nanostructures can not only retain the characteristic of metallic materials, but also realize the assembling pattern of arbitrary subtle shape. The formation of Au-Ag alloy nanostructures was confirmed by energy dispersive X-ray(EDX) diffraction, indicating the fabricated nanostructures were different in the ratio of gold to silver for different molar ratios in the solution. The composite metal material was applied for catalysis of hydrogen pero-xide and an ideal result was achieved.

Key words: Bimetallic nanostrueture, Au-Ag alloy, Femtosecond laser fabrication, Pattern

CLC Number:

O614.12
O644

TrendMD:

ZHOU Ying, XU Ying, LIU Lianqing, YANG Hai, WANG Jiping. Direct Femtosecond Laser Processing of Gold-silver Alloy Nanostructure by Photoreduction^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1472.

Figures/Tables 8

Fig.1 Schematic illustration for femtosecond laser direct writing co-reduced assembly Au-Ag alloy nanostructure

Fig.2 SEM images of Au20 alloy wires of different widths prepared under different laser powerLaser power/mW: (A) 4; (B) 6; (C) 8; (D) 10; (E) 12.

Fig.3 Dependence of wire width on the laser power

Fig.4 SEM images of Au20 alloy nanostructures with different magnifications

Fig.5 EDS characterization of Au20 alloy nanostructures(A) The scanning area of Au20 alloy nanostructures; (B) the whole distribution of all selected elements;(C)—(F) the elemental distribution of C(C), O(D), Ag(E), Au(F).

Fig.6 EDX characterization of Au20(A), Au50(B), Au80(C) and Au/Ag ratio of Au-Ag alloy nanostructures before and after laser processing(D)

Fig.7 SEM images of different laser patterned Au-Ag alloy micropatterns from ionic precursor solution (A) Red cross logo; (B) Santa head; (C) saving water mark; (D) cartoon cow.

Fig.8 Catalytic performance of Au-Ag alloy for H2O2(30%) degraelationOptical microscopy images of bubble motion with the reaction time of 3 s(A), 6 s(B), 9 s(C) and 12 s(D).

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