Fabrication and characterization of copper nanoparticle thin-films and the electrocatalytic behavior

Wang, Haiyan; Huang, Yugai; Tan, Zhijun; Hu, Xiaoyun

doi:10.1016/j.aca.2004.08.060

Cited by 99 publications

(70 citation statements)

References 24 publications

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“…Experimental spectra of colloidal suspensions fabricated in water with 100 lJ pulse energy. Theoretical fit was obtained with Cu 2 O-Cu and Cu 2 O Nps. The inset shows the optimal size distribution of core radii and shell thickness that best fits the experimental spectrum.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] Copper properties such as high conductivity, photosensitivity, and low cost makes it a promising material for chemical, electronic, and photonic integration in miniaturized devices for use in biological nanosensors, [6][7][8][9][10] as well as its capability of insertion in host polymer matrices for nonlinear optical applications. [11][12][13] Optical properties such as extinction and plasmon resonance are highly size dependent below 10 nm.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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We report on the analysis of structure, configuration, and sizing of Cu and Cu oxide nanoparticles (Nps) produced by femtosecond (fs) laser ablation of solid copper target in liquids. Laser pulse energy ranged between 500 lJ and 50 lJ. Water and acetone were used to produce the colloidal suspensions. The study was performed through optical extinction spectroscopy using Mie theory to fit the full experimental spectra, considering free and bound electrons size dependent contributions to the metal dielectric function. Raman spectroscopy and AFM technique were also used to characterize the sample. Considering the possible oxidation of copper during the fabrication process, two species (Cu and Cu 2 O) arranged in two structures (bare core or core-shell) and in two configuration types (Cu-Cu 2 O or Cu 2 O-Cu) were considered for the fitting depending on the laser pulse energy and the surrounding media. For water at high energy, it can be observed that a CuCu 2 O configuration fits the experimental spectra of the colloidal suspension, while for decreasing energy and below a certain threshold, a Cu 2 O-Cu configuration needs to be included for the optimum fit. Both species coexist for energies below 170 lJ for water. On the other hand, for acetone at high energy, optimum fit of the full spectrum suggests the presence a bimodal Cu-Cu 2 O core-shell Nps distribution while for decreasing energy and below a 70 lJ threshold energy value, Cu 2 O-Cu core-shell Nps must be included, together with the former configuration, for the fit of the full spectrum. We discuss possible reasons for the changes in the structural configuration of the core-shell Nps. V C 2013 American Institute of Physics. [http://dx

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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“…Nitrite oxidation-based methods with a final product of NO 3 are usually preferred because the presence of interfering molecules (such as oxygen) during reduction can be avoided 33 . However, an oxidation reaction as the basis for detecting nitrite requires a high over-potential 34 ; thus, in recent years, many attempts have been made to develop novel electrode materials [35][36][37][38][39][40][41][42][43][44][45][46][47][48] .…”

Section: Introductionmentioning

confidence: 99%

Toward point-of-care management of chronic respiratory conditions: Electrochemical sensing of nitrite content in exhaled breath condensate using reduced graphene oxide

et al. 2017

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We present a portable non-invasive approach for measuring indicators of inflammation and oxidative stress in the respiratory tract by quantifying a biomarker in exhaled breath condensate (EBC). We discuss the fabrication and characterization of a miniaturized electrochemical sensor for detecting nitrite content in EBC using reduced graphene oxide. The nitrite content in EBC has been demonstrated to be a promising biomarker of inflammation in the respiratory tract, particularly in asthma. We utilized the unique properties of reduced graphene oxide (rGO); specifically, the material is resilient to corrosion while exhibiting rapid electron transfer with electrolytes, thus allowing for highly sensitive electrochemical detection with minimal fouling. Our rGO sensor was housed in an electrochemical cell fabricated from polydimethyl siloxane (PDMS), which was necessary to analyze small EBC sample volumes. The sensor is capable of detecting nitrite at a low over-potential of 0.7 V with respect to an Ag/AgCl reference electrode. We characterized the performance of the sensors using standard nitrite/buffer solutions, nitrite spiked into EBC, and clinical EBC samples. The sensor demonstrated a sensitivity of 0.21 μA μM − 1 cm − 2 in the range of 20-100 μM and of 0.1 μA μM − 1 cm − 2 in the range of 100-1000 μM nitrite concentration and exhibited a low detection limit of 830 nM in the EBC matrix. To benchmark our platform, we tested our sensors using seven pre-characterized clinical EBC samples with concentrations ranging between 0.14 and 6.5 μM. This enzyme-free and label-free method of detecting biomarkers in EBC can pave the way for the development of portable breath analyzers for diagnosing and managing changes in respiratory inflammation and disease.

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“…This open pore structure is attributable to the presence of pyramidal crystals and the possible adsorption of hydrogen bubbles on the electrode surface, which can explain the formation of the voids seen in Figure 3B. The evolution of hydrogen depends on the solution pH and this has been reported in the literature 11,12 to occur at negative potentials due to the interaction of H-atoms adsorbed in specific sites and diffusing protons, according to the following equation:…”

Section: Resultsmentioning

confidence: 66%

Morphology, microstructure and electrocatalytic properties of activated copper surfaces

Gamboa

Petri

Benedetti

et al. 2012

J. Braz. Chem. Soc.

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Alterações morfológicas em superfícies de cobre resultantes da aplicação de um protocolo definido de potencial foram examinadas por microscopia eletrônica de varredura (MEV) e microscopia de força atômica (AFM). Os resultados mostraram uma boa correlação entre o tempo empregado na ativação do eletrodo, microestrutura resultante e a atividade eletroquímica.Morphologic changes on copper surfaces upon applying an established potential protocol were examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results showed a good correlation between the time employed in the electrode activation and the resulting microstructure and electrochemical activity.Keywords: nitrite, copper electrode, activation process, SEM, AFM IntroductionThe deliberate manipulation of electrodic surfaces consists of an area of continuing interest, because this approach leads to an improvement in the ability to recognize molecules and carry out electron transfer processes at higher rates. Hence, one of the dominant subjects in electrochemistry is the attempt to control the chemical composition and morphological structure of the electrode surface to gain advantages in electroanalytical determinations. It is well known that the electroactivity of copper surfaces depends strongly on their morphology, surface area and structure, which would in turn depend on the method employed to prepare the electrode prior to electrochemical measurements. Hence, several studies have been reported in the literature on the use of copper surfaces aiming for the quantification of different species such as glucose, 1 carbohydrates, 2 ethanol, 3 nitrate, 4, 5 nitrite, 5 and sufite. 6 The electrochemical determination of nitrate after deposition of copper from solutions containing Cu(II) has been reported by some authors, 7,8 who examined qualitatively the morphology of the copper deposit by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The increased sensitivity for nitrate after the surface modification by deposition of the fresh copper layer was attributed to morphologic changes assessed through quantitative parameters such as roughness and porosity of the film. Our group reported a new procedure for the activation of copper surfaces using a potential protocol based on copper oxidation and subsequent reduction of generated copper ions. 9,10 Taking into account these findings and as an attempt to understand which surface parameters control the electrochemical activity, the present study aims to evaluate whether there is a quantitative correlation between the surface area of copper electrodes and their electrochemical properties. Accordingly, copper electrodes were activated for different periods of time to produce layers which were analyzed by SEM and AFM. Then, the electrochemical activity of each generated surface was evaluated towards the cathodic reduction of nitrite. To the best of our knowledge, this is the first time that such a quantitative approach is applied for copper electrodes. Experimental Chemicals a...

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Fabrication and characterization of copper nanoparticle thin-films and the electrocatalytic behavior

Cited by 99 publications

References 24 publications

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Toward point-of-care management of chronic respiratory conditions: Electrochemical sensing of nitrite content in exhaled breath condensate using reduced graphene oxide

Morphology, microstructure and electrocatalytic properties of activated copper surfaces

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