Synthesis of nanostructured metals using Template-Assisted ElectrodepositionUdit Kumar (163110065)

Overview Introduction Electrodeposition Technique Types of Template Deposition Different Types of Templates and Their importance Anodic Alumina Templates metallic nanowires and nanotubes by anodic alumina

template-assisted electrodeposition Conclusions References

Introduction Template-assisted electrodeposition is an important

technique for synthesizing metallic nanomaterials with controlled shape and size.

Arrays of nanostructured materials with specific arrangements can be prepared by this method.

employing either an active or restrictive template as a cathode in an electrochemical cell.

After deposition process is over the templates are removed carefully to get the desired structure.

Electrodeposition Technique

Different Types of Templates and Their importance

1.) Active Template-Assisted Electrodeposition

A schematic diagram for synthesis of nanoparticle arrays through active template-assisted synthesis

The formation of nanostructures in active template-based synthesis results from growth of the nuclei that invariably nucleate at the holes and defects of the electrode substrate.

weak substrate-deposit interaction leading to preferential silver deposition at step edges and other surface defects

Different Types of Templates and Their importance

2.)Restrictive Template-Based Electrodeposition

A schematic electrode arrangement for the synthesisof nanowires though restrictivetemplate-assisted electrodeposition.

Anodic Alumina Templates

Schematic diagram of the process for the fabrication of the metal nano-hole array:(A) porous alumina with through holes (mother structure),(B) metal deposition with vacuum evaporation,(C) injection and polymerization of methyl methacrylate, (D) poly(methyl methacrylate) negative type, (E) electroless metal deposition, and(F) metal hole array.

Metallic nanowires and nanotubes by anodic alumina template-assisted electrodeposition

Schematic diagram for co-deposition process of Co-Ni binary nanowires in nanopores of AAO template. (a)AAO template with circular shape,(b) filling of nanopores started from Co-Ni binary nanowires at the bottom of AAO by exposing circular area to the Co and Ni precursor solution, (c) complete filling of the alumina nanopores from Co-Ni binary nanowires, (d) dissolution of alumina in NaOH to get Co-Ni binary nanowires

References

[1] Bera, D., Kuiry, S. C., & Seal, S. (2004). Synthesis of nanostructured materials using template-assisted electrodeposition. Jom, 56, 49–53. http://doi.org/10.1007/s11837-004-0273-5[2] Li, X., Wei, X., & Ye, Y. (2009). Template electrodeposition to cobalt-based alloys nanotube arrays. Materials Letters, 63(5), 578–580. http://doi.org/10.1016/j.matlet.2008.12.002[3] Mishra, R., & Podlaha, E. J. (2006). Template Electrodeposition of Cobalt – Gadolinium Alloys, 199–202. http://doi.org/10.1149/1.2360020[4] Vázquez, M. (2015). Magnetic Nano-and Microwires. Design, Synthesis, Properties and Applications (Vol. 1). http://doi.org/10.1017/CBO9781107415324.004