Preparation and characterization of Au–Ag and Au–Cu alloy nanoparticles in chloroform

Kim, Min‐Joo; Na, Heay-Jin; Lee, Kyoung Chul; Yoo, Eun Ah; Lee, Minyung

doi:10.1039/b304006m

Cited by 111 publications

(109 citation statements)

References 15 publications

(24 reference statements)

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“…3a). This increase of peak width in the Au-Cu system has been already reported in the literature and has ascribed to the larger interband contributions of Cu when compared to those of Au [39,40].…”

Section: Characterization Of Photocatalystsmentioning

confidence: 56%

“…The Au 4f core-level spectra showed photoemitted electrons with binding energies at 84.0-84.4 eV (Au 4f 7/2 ) indicating that metallic Au was the only gold species on the near surface region of the photocatalysts. The progressive increase in binding energy values observed as the amount of Cu increases in the alloy nanoparticles in an additional indication of the existence of Au-Cu alloys and electron density transfer between copper and gold [31,40]. The position of the Cu 2p 3/2 signal in the bimetallic photocatalysts was maintained approximately constant at 933.6-933.7 eV, which is slightly higher than that corresponding to metallic Cu.…”

Section: Characterization Of Photocatalystsmentioning

confidence: 91%

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Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

et al. 2014

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Au/TiO 2 , Au 0.75 Cu 0.25 /TiO 2 , Au 0.5 Cu 0.5 /TiO 2 and Au 0.25 Cu 0.75 /TiO 2 photocatalysts prepared from preformed Au and Au-Cu alloy nanoparticles of controlled composition and size were loaded over ceramic honeycombs (2 mg cm -2 ) and tested in an optical fiber photoreactor illuminated with UV LEDs (2.6 mW cm -2 ) to continuously produce hydrogen from water and ethanol mixtures in gas phase at W/F = 4 g min L -1 and 298 K (where W is the weight of the catalyst and F is the flow rate). The photocatalytic honeycombs were characterized by high resolution transmission electron microscopy, highangle annular dark-field imaging, energy dispersive X-ray, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy. The yield of hydrogen generation was Au 0.75 Cu 0.25 / TiO 2 [ Au 0.5 Cu 0.5 /TiO 2 * Au/TiO 2 [ Au 0.25 Cu 0.75 /TiO 2 ) bare TiO 2 , thus demonstrating that the addition of small quantities of copper to conventional TiO 2 -supported gold photocatalysts promotes the photocatalyic activity, likely by providing effective charge transfer between Au and Cu in the alloy nanoparticles.

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Section: Characterization Of Photocatalystsmentioning

confidence: 56%

Section: Characterization Of Photocatalystsmentioning

confidence: 91%

Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

et al. 2014

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“…With electromagnetic wave excitation, metallic NPs can be used as anti-reflection surfaces because they excite localized SPR that increases the optical absorption by light trapping. [2][3][4][5]13,32 The localized electromagnetic field around the metallic NPs can be significantly enhanced at their resonant frequencies. 33 In addition, the light scattering properties become dominant for larger NPs.…”

mentioning

confidence: 99%

“…However, these materials are more suitable for applications in the ultraviolet (UV) and infrared (IR) ranges given their SPR frequencies. 4,32 To reduce optical reflection over broadband, alloy NPs, such as Ag-Au NPs, have been applied. 5,13 Recently, Al and Ag NPs and their nanoshells were applied in Si solar cells by Gu et al [2][3][4] The emergence of metallic NPs in addition to conventional anti-reflection surfaces can further improve the overall anti-reflection performance to increase the efficiency of optoelectronic devices.…”

mentioning

confidence: 99%

Design and fabrication of broadband ultralow reflectivity black Si surfaces by laser micro/nanoprocessing

et al. 2014

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Light collection efficiency is an important factor that affects the performance of many optical and optoelectronic devices. In these devices, the high reflectivity of interfaces can hinder efficient light collection. To minimize unwanted reflection, anti-reflection surfaces can be fabricated by micro/nanopatterning. In this paper, we investigate the fabrication of broadband anti-reflection Si surfaces by laser micro/nanoprocessing. Laser direct writing is applied to create microstructures on Si surfaces that reduce light reflection by light trapping. In addition, laser interference lithography and metal assisted chemical etching are adopted to fabricate the Si nanowire arrays. The anti-reflection performance is greatly improved by the high aspect ratio subwavelength structures, which create gradients of refractive index from the ambient air to the substrate. Furthermore, by decoration of the Si nanowires with metallic nanoparticles, surface plasmon resonance can be used to further control the broadband reflections, reducing the reflection to below 1.0% across from 300 to 1200 nm. An average reflection of 0.8% is achieved.

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“…These properties are completely related to the size of particles which are not seen in the bulk state [1][2][3][4][5][6][7][8][9][10]. Metal nanoparticles have plasmon absorption resonance band that for different metals with different dielectric equations, their absorption peak is changed in the ultraviolet-visible region [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Au-Zn Nanoalloy by Laser Irradiation in Liquid Media

2012

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Alloy nanoparticles due to their possibility of regulation, the region of absorption peak and consequently their optical and electrical properties, have a specific significance. In this research, nanosecond laser pulses of Nd:YAG laser with 532 nm wavelength that is close to absorption peak of gold and zinc nanoparticles, were used for synthesis of alloy. Atomic absorption spectrum UV-Visible, X-ray diffraction analysis and transmission electron microscopy images were utilized for characterization as well. For synthesis of Au-Zn alloy nanoparticles, zinc and gold nanoparticles were prepared separately by laser ablation method and then the mixture of their colloidal solutions with specified ratio was exposed to laser radiation. Thereby, gold and zinc nanoparticles were combined by absorbing of laser beam and gaining of required energy for melting, and Au-Zn alloy nanoparticles were formed. Wavelength of 532 nm is more effective in the formation of alloy than 1064 nm because of being close to wavelength of surface plasmon resonance of gold and zinc nanoparticles. Increase of concentration of gold nanoparticles compared to zinc nanoparticles in the mixed solution causes that gold nanoparticles absorb the most of the energy of laser and then larger gold particles are created, so alloy nanoparticles are not formed. The best time duration for irradiation and accomplishment of alloy formation is 30 min.

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Preparation and characterization of Au–Ag and Au–Cu alloy nanoparticles in chloroform

Cited by 111 publications

References 15 publications

Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

Hydrogen Photoproduction from Ethanol–Water Mixtures Over Au–Cu Alloy Nanoparticles Supported on TiO2

Design and fabrication of broadband ultralow reflectivity black Si surfaces by laser micro/nanoprocessing

Synthesis and Characterization of Au-Zn Nanoalloy by Laser Irradiation in Liquid Media

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