Abstract
Aspect ratios of gold nanorods have been finely modified in reduction-limited conditions via two electrochemical ways: by changing the amount of a growth solution containing small gold clusters in the presence of already prepared gold nanorods as seeds or by changing electrolysis time in the presence or absence of a silver plate. While the atomic molar ratio of gold in the growth solution to gold in the seed solution is critical in the former method, the relative molar ratio of gold ions to silver ions in the electrolytic solution is important in the latter way for the control of the aspect ratios of gold nanorods. The aspect ratios of gold nanorods decrease with an increase of electrolysis time in the absence of a silver plate, but they increase with an increase of electrolysis time in the presence of a silver plate.
Highlights
The design and controlled fabrication of nanostructured materials with functional properties have been extensively investigated to attract a great deal of attention [1,2,3,4,5,6,7]
We report that the aspect ratio modification of gold NRs can be approached in two electrochemical ways: by changing the amounts of growth solutions or by changing electrolysis time in the presence or absence of a silver plate
They have been finely modified by changing the amount of a growth solution containing small gold clusters in the presence of already prepared gold NRs as seeds
Summary
The design and controlled fabrication of nanostructured materials with functional properties have been extensively investigated to attract a great deal of attention [1,2,3,4,5,6,7]. The synthesis of aspect ratio-controlled gold NRs is important because it leads us to explore their properties and to find their applications in sensing and imaging nanoscience Several approaches such as seeding [22,23,24], ultrasonic [25], photochemical [20, 26, 27], and electrochemical methods [28,29,30,31,32,33,34,35,36] have been carried out to control the aspect ratios of gold NRs. We note that bioreduction techniques [37, 38] have been applied to study faceting and surface reconstruction on gold. The roles of silver ions in the determination of the aspect ratios of gold NRs have not been fully understood yet regardless of many reports [18, 23]
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