Electrochemical gold deposition from sulfite solution: application for subsequent polyaniline layer formation

Baltrūnas, G.; Valiūnienė, Aušra; Vienožinskis, Justas; Gaidamauskas, Ernestas; Jankauskas, Teofilis; Margarian, Žana

doi:10.1007/s10800-008-9596-1

Cited by 20 publications

(9 citation statements)

References 16 publications

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“…35 Mixing DMAP with a second ligand is known to reduce the anisotropy in Au colloids. 36 Accordingly, to enhance the anisotropic growth, we aimed to remove sulfite from the EP bath, which shows a strong affinity to Au 37 and thus is expected to compete with DMAP. This was realized by switching to [AuCl 4 ] − as the metal precursor, in which the chloride ligands can be exchanged relatively easily.…”

Section: Resultsmentioning

confidence: 99%

Template-Free Electroless Plating of Gold Nanowires: Direct Surface Functionalization with Shape-Selective Nanostructures for Electrochemical Applications

Muench

Schaefer

Hagelüken

et al. 2017

ACS Appl. Mater. Interfaces

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Metal nanowires (NWs) represent a prominent nanomaterial class, the interest in which is fueled by their tunable properties as well as their excellent performance in, for example, sensing, catalysis, and plasmonics. Synthetic approaches to obtain metal NWs mostly produce colloids or rely on templates. Integrating such nanowires into devices necessitates additional fabrication steps, such as template removal, nanostructure purification, or attachment. Here, we describe the development of a facile electroless plating protocol for the direct deposition of gold nanowire films, requiring neither templates nor complex instrumentation. The method is general, producing three-dimensional nanowire structures on substrates of varying shape and composition, with different seed types. The aqueous plating bath is prepared by ligand exchange and partial reduction of tetrachloroauric acid in the presence of 4-dimethylaminopyridine and formaldehyde. Gold deposition proceeds by nucleation of new grains on existing nanostructure tips and thus selectively produces curvy, polycrystalline nanowires of high aspect ratio. The nanofabrication potential of this method is demonstrated by producing a sensor electrode, whose performance is comparable to that of known nanostructures and discussed in terms of the catalyst architecture. Due to its flexibility and simplicity, shape-selective electroless plating is a promising new tool for functionalizing surfaces with anisotropic metal nanostructures.

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Section: Resultsmentioning

confidence: 99%

Template-Free Electroless Plating of Gold Nanowires: Direct Surface Functionalization with Shape-Selective Nanostructures for Electrochemical Applications

Muench

Schaefer

Hagelüken

et al. 2017

ACS Appl. Mater. Interfaces

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“…Nowadays, the most commonly used cyanide-free gold electroplating electrolytes use sulte as the complexing agent. 21,22 However, these sulte-based gold electroplating electrolytes still suffer from problems of instability. 23 5,5-dimethylhydantoin (DMH), a promising environmentally friendly complexing agent, can replace cyanide due to its good coordinating capability with several metal ions such as gold, silver, and copper ions.…”

Section: Introductionmentioning

confidence: 99%

Role of polyethyleneimine as an additive in cyanide-free electrolytes for gold electrodeposition

et al. 2015

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The influence of polyethyleneimine (PEI) on the electrochemical behavior of cyanide-free electrolytes with 5,5-dimethylhydantoin (DMH) as a complexing agent was investigated using cyclic voltammetry (CV), chronoamperometry, and cathodic polarization measurements. The gold electrodeposition displayed three-dimensional (3-D) progressive nucleation in both the absence and presence of PEI according to the Scharifer and Hills (SH) nucleation model. With the addition of PEI, the cathodic overpotential showed an immense negative shift, and the limiting diffusion current density and the diffusion coefficient decreased. Gold electrodeposits were characterized by SEM and AFM for the micromorphology, XRD for the crystal structure, and XPS for the purity. There was preferential growth of gold crystals along the (111) crystal face in both the presence and absence of PEI, but overall growth was inhibited in the presence of PEI. The quality of the gold electrodeposit was significantly improved in the presence of PEI, with a bright golden color and high purity, smooth and compact morphology.

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“…Although the cyanide solution prolongs the life of the electroplating bath, new alternative methods appeared lately to prevent this disadvantage. For example, gold sulfite [ 158 ] and hydrogen tetrachloroaurate (HAuCl 4 ) have been the subject of several reports on the synthesis of Au NWs by electrodeposition or electroless deposition [ 159 , 160 , 161 ]. Wang et al [ 161 ] synthesized Au NWs at different temperatures in one-step process using ethanol as a reducing agent for HAuCl 4 .…”

Section: Electrochemical Detection and Removal Of Heavy Metalsmentioning

confidence: 99%

Removal of Heavy Metals from Wastewaters: A Challenge from Current Treatment Methods to Nanotechnology Applications

Vidu

Matei

Predescu

et al. 2020

Toxics

116

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Removing heavy metals from wastewaters is a challenging process that requires constant attention and monitoring, as heavy metals are major wastewater pollutants that are not biodegradable and thus accumulate in the ecosystem. In addition, the persistent nature, toxicity and accumulation of heavy metal ions in the human body have become the driving force for searching new and more efficient water treatment technologies to reduce the concentration of heavy metal in waters. Because the conventional techniques will not be able to keep up with the growing demand for lower heavy metals levels in drinking water and wastewaters, it is becoming increasingly challenging to implement technologically advanced alternative water treatments. Nanotechnology offers a number of advantages compared to other methods. Nanomaterials are more efficient in terms of cost and volume, and many process mechanisms are better and faster at nanoscale. Although nanomaterials have already proved themselves in water technology, there are specific challenges related to their stability, toxicity and recovery, which led to innovations to counteract them. Taking into account the multidisciplinary research of water treatment for the removal of heavy metals, the present review provides an updated report on the main technologies and materials used for the removal of heavy metals with an emphasis on nanoscale materials and processes involved in the heavy metals removal and detection.

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Electrochemical gold deposition from sulfite solution: application for subsequent polyaniline layer formation

Cited by 20 publications

References 16 publications

Template-Free Electroless Plating of Gold Nanowires: Direct Surface Functionalization with Shape-Selective Nanostructures for Electrochemical Applications

Template-Free Electroless Plating of Gold Nanowires: Direct Surface Functionalization with Shape-Selective Nanostructures for Electrochemical Applications

Role of polyethyleneimine as an additive in cyanide-free electrolytes for gold electrodeposition

Removal of Heavy Metals from Wastewaters: A Challenge from Current Treatment Methods to Nanotechnology Applications

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