Optical properties of a self-assembled Cu/Cu2O multilayered structure studied in situ during deposition

Мишина, Е. Д.; Nagai, Kazunari; Barsky, Dmitry; Nakabayashi, Seiichiro

doi:10.1039/b105784g

Cited by 9 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One category is the formation of nano-scale multilayers of Cu 2 O and mixed Cu/Cu 2 O composites from an alkaline Cu 2+ -chelated solution. [1][2][3][4][5][6][7][8][9][10][11][12] A mechanism is proposed based on pH changes and local precipitation of Cu(OH) 2 close to the electrode surface during the deposition process, combining with the alternative oscillation Cu 2+ -tartrate and Cu 2+ -lactate. 6,7 According to in situ electrochemical quartz crystal microbalance (EQCM) studies, the potential oscillations induce the deposition on the cathode to be a composite layer of Cu/Cu 2 O at a higher cathodic potential (i.e., the plateau region), whereas a very thin Cu 2 O layer is formed at a lower cathodic potential (i.e., the positive spike region).…”

mentioning

confidence: 99%

Spontaneous Potential Oscillation Resulting in Copper Deposit with Ultra-Large Grains

Chan

Dow

2019

J. Electrochem. Soc.

View full text Add to dashboard Cite

There are three categories of spontaneous oscillations in copper electrodeposition. The first one is the formation of nano-scale multilayers of Cu 2 O and mixed Cu/Cu 2 O composites from an alkaline Cu 2+ -chelated solution. The second one is the formation of sub-microscale multilayers of Cu from a sulfuric acid system. The copper with sub-microscale multilayers composes of a series of horizontal grain boundaries, and the horizontal grain boundaries was formed with incorporation of organic compounds, namely plating additives. In this case, not only the grain boundaries are horizontal, but also the plating additives show a leveling capability to form a flat surface. The third one is the copper deposit formation with ultra-large grain (ULG) from a sulfuric acid plating system in this study. No organic compounds were incorporated in the copper-ULG and the surface, edges and corners of the copper-ULG, showing a single crystal outward appearance. The spontaneous oscillations waveform of ULG copper deposition was quite complicated, and it is caused by the changing/ageing of the organic compounds in the plating solution and the continuously changing of deposit surface area.

show abstract

mentioning

confidence: 99%

Spontaneous Potential Oscillation Resulting in Copper Deposit with Ultra-Large Grains

Chan

Dow

2019

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…[101] Oxidation of S 2À [35,36] Si [79][80][81] Cu [102][103][104][105][106] Oxidation of thiourea [37] Ag [82] AgSb-alloy [107][108][109][110][111][112][113][114] Reduction of In 3þ [38,39] Nb [83,84] Cu/Cu 2 O [115][116][117][118][119][120][121][122][123][124][125] Reduction of H 2 O 2 [40][41][42][43][44][45][46][47] Al [85] SnCu-alloy [126,127] Reduction of S 2 O 8 2À [48][49][50] InP [86] NiP-alloy …”

Section: Dynamic Self-organization In Electrochemical Reactionsmentioning

confidence: 99%

“…Now, let us consider the mechanism for the potential oscillation and formation of a layered structure in the NiÀP alloy deposition, observed under the galvanostatic condition with a constant applied j (see Figure 6.10c). Formation of the layered structure was directly evidenced using scanning tunneling microscopy [115], scanning electron microscopy ( Figure 6.14a) [115], Auger electron microscopy [116], and second-harmonic generation [117]. The occurrence of the high-rate NiÀP deposition, on the other hand, leads to a decrease in the surface Ni 2þ concentration (Cs) and thus causes a gradual negative U shift to keep the constant j.…”

Section: Nano-scale Layered Structures Of Iron-group Alloysmentioning

confidence: 99%

Self‐Organized Formation of Layered Nanostructures by Oscillatory Electrodeposition

Nakanishi

2008

Nanostructured Materials in Electrochemistry

View full text Add to dashboard Cite

Solid surfaces with ordered nanostructures, such as layers, dots, holes, and grooves (or ridges), have provided unique microelectronic, optical, magnetic, and micromechanical properties, as summarized in a recent review [1]. Focused photon-, electron-, ion-, and molecular-beam lithography (top-down method) have been widely used for creating desired nanostructures at the surface. However, these techniques are now facing serious problems, such as difficulties in mass production and cost increases due to the use of expensive, specialized apparatus. In the hope of overcoming those problems associated with the conventional techniques, a self-organization method (bottom-up method) has recently attracted much attention.In general, self-organization methods in chemistry can be categorized into two different types. One type is self-organization under thermodynamically equilibrium conditions, in which the ordered structures are formed on the basis of specific properties of intermolecular forces. Self-assembled structures, such as lipidbilayers, close-packed layers of nanospheres, and monolayers of thiol molecules on gold surfaces, are the representative examples. Many studies have been performed on this type of self-organization, as summarized in reviews [2][3][4][5][6][7][8][9][10]. At present, the main issues to be tackled for these methods are to improve their regularity and to be able to place nanostructures of desired size at desired locations. In the other type of self-organization, the ordered structures are formed under thermodynamically nonequilibrium conditions. A wide variety of dynamic spatiotemporal orders, such as oscillations and spatiotemporal patterns, appear in a self-organization manner [10][11][12][13].The spatiotemporal patterns in the dynamic self-organization phenomena have some unique and attractive properties for producing materials of ordered structures: j267 Nanostructured Materials in Electrochemistry. Edited by Ali Eftekhari . The patterns appear spontaneously, without any external control. . The observed patterns have a long-range order. . Various ordered patterns are obtained simply by changing experimental parameters.In fact, several studies have been performed on the application of dynamic selforganization for the formation of ordered structures. For example, the self-organized formation of 2-dimensional (2D) ordered patterns on nano-and micro-meter scales have been achieved by use of , etching [15,16], and dewetting processes [17,18]. These ordered 2D patterns on solid surfaces have already been used in practical applications as templates for constructing three-dimensional (3D) structures and substrates for the incubation of biological cells. 268j 6 Self-Organized Formation of Layered Nanostructures by Oscillatory Electrodeposition 274j 6 Self-Organized Formation of Layered Nanostructures by Oscillatory Electrodeposition

show abstract

Self‐Organization in Electrochemical Synthesis as a Methodology towards New Materials

et al. 2020

View full text Add to dashboard Cite

Despite its potential, self‐organization as a methodology for the synthesis of materials has not been developing at the pace required for the ample scale synthesis of materials with more complex structures. As there is an environmental demand for a fast change in the energy matrix, away from fossil fuels, by using materials with more complex composition and structure, this topic has been gaining potential. As complexity can be observed in many different fields of science, from biology to physical chemistry, this Review intends to focus on recent advances of self‐organization in electrochemical systems. To provide a deeper understanding of the literature being reviewed, the fundamentals of nonlinear dynamics in electrochemistry is discussed, based on classical literature. Following this, two electrochemical processes in which self‐organization is observed will be reviewed, namely electrodeposition and electrodissolution. In the final section, self‐organization is presented as a perspective for applied systems, where self‐organization is employed for the synthesis of materials of technological importance. This Review intends to reignite the debate on how self‐organization could be used to produce more complex materials than the traditional step‐by‐step approach could achieve.

show abstract

Optical properties of a self-assembled Cu/Cu2O multilayered structure studied in situ during deposition

Cited by 9 publications

References 16 publications

Spontaneous Potential Oscillation Resulting in Copper Deposit with Ultra-Large Grains

Spontaneous Potential Oscillation Resulting in Copper Deposit with Ultra-Large Grains

Self‐Organized Formation of Layered Nanostructures by Oscillatory Electrodeposition

Self‐Organization in Electrochemical Synthesis as a Methodology towards New Materials

Contact Info

Product

Resources

About