by Zhang Tao, Chinese Academy of Sciences
Characterization of three typical penta-twinned Au NCsCredit: Zhang Tao A research team led by Prof
Li Yue from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences (CAS), together with Prof
Li Cuncheng from University of Jinan, has recently developed a universal route with fine kinetic control to a family of penta-twinned gold nanocrystals
Gold nanocrystals (Au NCs) have attracted considerable attention in recent decades due to their unique size- and shape-dependent optical properties
To realize practical applications, a controlled synthesis of Au NCs is greatly of vital importance
Despite many seeded methods have been achieved to synthesize Au NCs, some of the major difficulties hindering the synthesis of different types of colloidal nanocrystals are their complex synthetic methods and the lack of a universal growth mechanism in one system
In this work, the researchers presented a general kinetically controlled seed-mediated growth method to synthesize the family of Au penta-twinned NCs in one growth system
With modulating atom deposition sites and rates through tailoring the R value (the molar ratio of reductant/Au precursors), seven kinds of penta-twinned nanocrystals with tunable sizes and high purity were fabricated
According to them, this strategy can be further used in the growth of a second metal (silver) on Au decahedral seeds with tunable optical absorbance from visible to Near-infrared range
More importantly, it does not require purification treatment and additional metal ions, greatly simplifying the synthesis process
Schematic of the kinetically controlled growth mechanism of different kinds of penta-twinned nanostructures
Credit: Zhang Tao The general method proposed here not only developed an effective kinetically controlled strategy to the family of penta-twinned NCs, but also gave a deep understanding on a universal mechanism for their formation, which may guide us to synthesize NCs in a designed mode
The research has been published online in Chemical Science
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