Nanocomposite films containing Au nanoparticles formed by electrochemical reduction of metal ions in the multilayer films as electrocatalyst for dioxygen reduction

2005 ◽  
Vol 535 (1-2) ◽  
pp. 15-22 ◽  
Author(s):  
Minghua Huang ◽  
Yan Shen ◽  
Wenlong Cheng ◽  
Yong Shao ◽  
Xuping Sun ◽  
...  
Keyword(s):  
Metal Ions ◽  
Electrochemical Reduction ◽  
Au Nanoparticles ◽  
Multilayer Films ◽  
Nanocomposite Films ◽  
Dioxygen Reduction

Microstructure and Optical Properties of Au–Y2O3-stabilized ZrO2 Nanocomposite Films

2005 ◽  
Vol 20 (9) ◽  
pp. 2516-2522 ◽  
Author(s):  
George Sirinakis ◽  
Rezina Siddique ◽  
Christos Monokroussos ◽  
Michael A. Carpenter ◽  
Alain E. Kaloyeros
Keyword(s):  
Optical Properties ◽  
Au Nanoparticles ◽  
Annealing Temperature ◽  
Rutherford Backscattering Spectrometry ◽  
Nanocomposite Films ◽  
Au Nanoparticle ◽  
X Ray Diffraction ◽  
Working Pressure ◽  
Optical Absorption Band ◽  
Size Dependent

Nanocomposite films consisting of gold nanoparticles embedded in an yttria stabilized zirconia (YSZ) matrix were synthesized at room temperature by radio-frequency co-sputtering from YSZ and Au targets at a 5 mTorr working pressure. The films were subsequently annealed for 2 h in 1 atm argon, with the annealing temperature varied from 600 to 1000 °C in steps of 100 °C. The composition, microstructure, and optical properties of the films were characterized as a function of annealing temperature by Rutherford backscattering spectrometry, scanning electron microscopy, Auger electron spectroscopy, x-ray diffraction, and absorption spectroscopy. An optical absorption band due to the surface plasmon resonance (SPR) of the Au nanoparticles was observed around a wavelength of 600 nm. Furthermore, the SPR band full width at half-maximum exhibited an inverse linear dependence on the radius of the Au nanoparticle, with a slope parameter A = 0.18, indicating a weak interaction between the YSZ matrix and the Au nanoparticles. The experimentally observed SPR dependence on nanoparticle size is discussed within the context of the Mie theory and its size-dependent optical constants.

scholarly journals Effect of surface ligands on gold nanocatalysts for CO2 reduction

2020 ◽  
Vol 11 (45) ◽  
pp. 12298-12306
Author(s):  
Hongyu Shang ◽  
Spencer K. Wallentine ◽  
Daniel M. Hofmann ◽  
Quansong Zhu ◽  
Catherine J. Murphy ◽  
...  
Keyword(s):  
Metal Ions ◽  
Au Nanoparticles ◽  
Co2 Reduction ◽  
Permeable Membrane ◽  
Surface Ligands ◽  
Minimal Loss ◽  
Effect Of Surface

Dodecanethiol on Au nanoparticles significantly enhances selectivity and stability with minimal loss in activity by acting as a CO2-permeable membrane, which blocks the deposition of metal ions that are otherwise responsible for rapid deactivation.

scholarly journals Bipyridine‐Assisted Assembly of Au Nanoparticles on Cu Nanowires To Enhance the Electrochemical Reduction of CO 2

2019 ◽  
Vol 131 (40) ◽  
pp. 14238-14241 ◽  
Author(s):  
Jiaju Fu ◽  
Wenlei Zhu ◽  
Ying Chen ◽  
Zhouyang Yin ◽  
Yuyang Li ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Au Nanoparticles ◽  
Cu Nanowires

Two-Photon Sensing of Dopamine by Using Au Nanoparticles

2015 ◽  
Vol 738-739 ◽  
pp. 31-37
Author(s):  
Cui Feng Jiang ◽  
Neng Yue Gao ◽  
Qi Sheng Wu ◽  
Yu Sun ◽  
Qing Hua Xu
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Detection Limit ◽  
Metal Ions ◽  
Gold Nanoparticle ◽  
Au Nanoparticles ◽  
Cross Linking ◽  
Au Nps ◽  
Two Photon ◽  
Catechol Group

In this paper, we demonstrated a gold nanoparticle based two-photon photoluminescence (TPPL) assay for the detection of dopamine with the detection limit of 0.3 μM. Protonated dopamine molecules can bind bidentately to surface of gold atoms through the catechol group. The adsorption of dopamine displaces the stabilizing agent of citrate groups, and neutralizes the charge of solution, resulting in non-cross linking aggregation of Au NPs. Aggregation of Au NPs could induce significantly enhanced TPPL. Thus, a simple TPPL assay was designed. We have shown that when Au NPs solution was mixed with dopamine, TPPL intensity increased by about 47 times. The mechanism of sensing assay has been discussed. In addition, the TPPL assay was highly selective to dopamine and it can distinguish from uric acid, ascorbic acid and metal ions.

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