Materials Science and Engineering/Materials for Biomedical Applications

Synthesis of perfect silver nanocubes by a simple polyol process

Process

Simple poly(vinyl pyrrolidone)-directed polyol synthesis process.

Parameters

• Process Parameters
  • Poly(vinyl pyrrolidone)/AgNO3 ratio R
  • Reaction temperature T

• Product Parameters
  • Morphology
  • Size

• Growth Mechanism
  • Thermodynamically Controlled
  • Kinetically Controlled

Product Properties

• Ag nanocubes
• Average edge length of 230 nm
• Sharp edges and corners
• Optical Properties
  • Attractive plasma resonance red-shift

Article

http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=8951&DID=196410&action=detail

Controlled Synthesis of Monodisperse Silver Nanocubes in Water

Process

In water on the basis of HTAB-modified silver mirror reaction at 120 C (HTAB, n-hexadecyltrimethylammonium bromide)

Parameters

• Process Parameters
  • Temperature: 120 C

Product Properties

• Monodisperse silver nanocubes
• Edge length of 55 ± 5 nm
• Single crystal bonded by six {200} facets
• Assemble into two-dimensional arrays

Article

http://pubs.acs.org/cgi-bin/abstract.cgi/jacsat/2004/126/i41/abs/ja046037r.html

Shape-Controlled Synthesis of Gold and Silver Nanoparticles

Process

Reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP)

Parameters

Process Parameters

• Molar ratio of PVP and its molar ratio (in terms of repeating unit) relative to silver nitrate

Product Parameters

• Geometric shape
• Size of the product

Product Properties

• Single crystals
• Slightly truncated shape
  • Bounded by {100}, {110}, and {111} facets

Link

http://www.sciencemag.org/cgi/content/full/298/5601/2176?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Puntes%2C+V.F.&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT

Synthesis and Galvanic Replacement Reaction of Silver Nanocubes in Organic Medium

Process

• Polyol process in which silver nitrate is reduced by ethylene glycol in the presence of a capping agent, poly(vinylpyrrolidone) (PVP)
• A ligand exchange reaction was used to replace the PVP with another capping agent, allowing the nanocubes to be soluble in chloroform
  • Oleylamine, oleic acid, and decane-thiol were among the ligands investigated

Shape-Controlled Synthesis of Metal Nanostructures: The Case of Silver

Process

• Growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer-mediated polyol process.

Parameters

Process Parameters

• Concentration of AgNO3 (the precursor to silver)
• Molar ratio between poly(vinylpyrrolidone) (PVP, the capping agent) and AgNO3
• Strength of chemical interaction between PVP and various crystallographic planes of silver
• Crystallinity of a seed
• Extent of the PVP coverage on the seed

Product Parameters

• Crystallinity of seeds (e.g., single crystal versus decahedral multiply twinned particles)
• Morphology of final product

Article

http://www3.interscience.wiley.com/cgi-bin/abstract/109800818/ABSTRACT

Morphology and size-controlled synthesis of silver nanoparticles in aqueous surfactant polymer solutions

Process

Poly(methyl vinyl ether) used with precursor AgNO3 solution reduced using NaOH

Product Parameters

Average length of 29 nm

Article

http://www.springerlink.com/content/b8280v1807904197/fulltext.pdf

Synthesis of Gold Nanorods

Hyperthermic effects of gold nanorods on tumor cells

Gold Nanorods: Electrochemical Synthesis and Optical Properties

Wet Chemical Synthesis of High Aspect Ratio Cylindrical Gold Nanorods