Limits...
Observation of Coalescence Process of Silver Nanospheres During Shape Transformation to Nanoprisms

View Article: PubMed Central - HTML - PubMed

ABSTRACT

In this report, we observed the growth mechanism and the shape transformation from spherical nanoparticles (diameter ~6 nm) to triangular nanoprisms (bisector length ~100 nm). We used a simple direct chemical reduction method and provided evidences for the growth of silver nanoprisms via a coalescence process. Unlike previous reports, our method does not rely upon light, heat, or strong oxidant for the shape transformation. This transformation could be launched by fine-tuning the pH value of the silver colloidal solution. Based on our extensive examination using transmission electron microscopy, we propose a non-point initiated growth mechanism, which is a combination of coalescence and dissolution–recrystallization process during the growth of silver nanoprisms.

No MeSH data available.


Related in: MedlinePlus

Schematic illustration of the formation of the silver nanoprism via coalescence/dissolution–recrystallization processes. 1 Ag ions; 2 Ag cluster was formed by reducing Ag ion; 3 There is an initial burst of production of small nanospheres in the presence of sufficient cluster concentration; 4 Ag nanoparticles possess lower reduction potential dissolved and others aggregated into a triangular shape simultaneously, then recrystallize to form a triangular plate. The length of arrow represents the consumed reaction time.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211880&req=5

C1: Schematic illustration of the formation of the silver nanoprism via coalescence/dissolution–recrystallization processes. 1 Ag ions; 2 Ag cluster was formed by reducing Ag ion; 3 There is an initial burst of production of small nanospheres in the presence of sufficient cluster concentration; 4 Ag nanoparticles possess lower reduction potential dissolved and others aggregated into a triangular shape simultaneously, then recrystallize to form a triangular plate. The length of arrow represents the consumed reaction time.

Mentions: Scheme 1 shows a schematic diagram outlining a plausible mechanism, the details deserve future investigation. The silver clusters were formed by reducing AgNO3 with NaBH4:


Observation of Coalescence Process of Silver Nanospheres During Shape Transformation to Nanoprisms
Schematic illustration of the formation of the silver nanoprism via coalescence/dissolution–recrystallization processes. 1 Ag ions; 2 Ag cluster was formed by reducing Ag ion; 3 There is an initial burst of production of small nanospheres in the presence of sufficient cluster concentration; 4 Ag nanoparticles possess lower reduction potential dissolved and others aggregated into a triangular shape simultaneously, then recrystallize to form a triangular plate. The length of arrow represents the consumed reaction time.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211880&req=5

C1: Schematic illustration of the formation of the silver nanoprism via coalescence/dissolution–recrystallization processes. 1 Ag ions; 2 Ag cluster was formed by reducing Ag ion; 3 There is an initial burst of production of small nanospheres in the presence of sufficient cluster concentration; 4 Ag nanoparticles possess lower reduction potential dissolved and others aggregated into a triangular shape simultaneously, then recrystallize to form a triangular plate. The length of arrow represents the consumed reaction time.
Mentions: Scheme 1 shows a schematic diagram outlining a plausible mechanism, the details deserve future investigation. The silver clusters were formed by reducing AgNO3 with NaBH4:

View Article: PubMed Central - HTML - PubMed

ABSTRACT

In this report, we observed the growth mechanism and the shape transformation from spherical nanoparticles (diameter ~6 nm) to triangular nanoprisms (bisector length ~100 nm). We used a simple direct chemical reduction method and provided evidences for the growth of silver nanoprisms via a coalescence process. Unlike previous reports, our method does not rely upon light, heat, or strong oxidant for the shape transformation. This transformation could be launched by fine-tuning the pH value of the silver colloidal solution. Based on our extensive examination using transmission electron microscopy, we propose a non-point initiated growth mechanism, which is a combination of coalescence and dissolution–recrystallization process during the growth of silver nanoprisms.

No MeSH data available.


Related in: MedlinePlus