Optical properties of Pd-Ag and Pt-Ag nanoboxes synthesized via galvanic replacement reactions

Nano Letters

Volumn 5, Issue 10, 2005, Pages 2058-2062

  Chen, Jingyi ^a   Wiley, Benjamin ^b   McLellan, Joseph ^a   Xiong, Yujie ^a   Li, Zhi Yuan ^c   Xia, Younan ^a  

^a UNIVERSITY OF WASHINGTON   (United States)

^b University of Washington   (United States)

^c INSTITUTE OF PHYSICS   (China)

Author keywords

[No Author keywords available]

Indexed keywords

MOLAR RATIOS; NANOBOX; SILVER NANOCUBES;

NANOSTRUCTURED MATERIALS; SINGLE CRYSTALS; SURFACE PLASMON RESONANCE; SYNTHESIS (CHEMICAL); WATER;

PALLADIUM ALLOYS;

EID: 27544438205     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl051652u     Document Type: Article

References (24)

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10. 4). After addition of the noble metal salt, the solution was refluxed until its color became stable (about 10 min). Vigorous magnetic stirring was maintained during the entire process. After the solution had been cooled to room temperature, white AgCl precipitated and settled at the bottom of the container. The AgCl was dissolved by adding a saturated solution of NaCl. The solution was then transferred into a tube and centrifuged at 10 000 rpm for 20 min. The supernatant containing the dissolved AgCl could be removed easily using a pipet. The solid was rinsed with water and centrifuged six more times before final dispersion in water for further analysis. SEM and TEM samples were prepared by drying a drop of final product on a small piece of Si wafer or a carbon-coated Cu grid under vacuum. SEM images were taken using a Sirion XL field-emission microscope (FEI, Hillsboro, OR) operated at an acceleration voltage of 15 kV. Energy-dispersive X-ray (EDX) measurements were conducted with EDAX system attached to the same microscope. TEM imaging and electron diffraction patterning was done using a Philips 420 microscope at 120 kV. The percentage of Pd and Ag in the nanostructures was analyzed using an atomic emission spectrophotometer (Thermo Jarrel Ash Corp., Franklin, MA) equipped with an inductively coupled plasma system. The emission lines at 328.0 and 340.5 nm were used to measure the contents of Ag and Pd, respectively. The UV-visible spectra were obtained using a Hewlett-Packard 8452A diode array spectrophotometer. XRD patterns were recorded with a Philips 1820 diffractometer equipped with a Cu Kα radiation source (E = 8.04 keV, λ = 1.544 Å). SERS substrates were prepared by drying 3 μL of the final product onto a 25 nm thick Al film, which was itself supported on a Si wafer. The substrate was then incubated in a 4 mM aqueous 4-mercaptopyridine solution for 1 h, rinsed with deionized water, and dried in air. SERS spectra were obtained at 785 nm laser excitation (Renishaw HP-NIR785) with 0.03 mW and a spot size of 1.6 μm at the surface using a Leica DM IRBE optical microscope equipped with a Renishaw inVia Raman system, a 1200 1/mm grating, and a thermoelectrically cooled CCD detector.
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