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Physical Chemistry Lab: Synthesis and Modeling of Different Morphologies of Gold Nanoparticles
Sarah WongAdvisor: Hoda Mirafzal
http://nanocomposix.com/collections/gold-spheres
Parts of the lab1. synthesize different sizes of gold
nanospheres
2. synthesize different morphologies of gold nanoparticles
3. model different sizes and shapes in MATLAB
Particle in a Box ConceptE
0
n=1
n=2
n=3
n=4
Lxn=
1
n=2
n=3
n=4
x
E
0 L
El Sayed, M. A. J. Phys. Chem. Letters. 2013, 4, 1541
Change in Spectra as Size Increases
Note the red shift of the absorption maximum as the gold nanoparticles size increases
http://www.cytodiagnostics.com/store/pc/Gold-Nanoparticle-Properties-d2.htm
Different Morphologies of Gold Nanoparticles
TEM images of gold nano particles.
Mirkin, C. A. et.al. Nano. Lett. 2011, 11, 3394El-Sayed, M. A.; Nikoobakht, B. Chem. Matter. 2003, 15, 1957
Spectrophotometer Signatures of Morphologies
http://spie.org/x15074.xml
sphere rod and disk
x
z
y
nanospherequantum confined
in x, y, and z.
nanorods/nanowiresquantum confined
in x and y
nanodisks/nanoplatesquantum confined in the y direction
x
z
y
x
z
y
Experimental Challenges
• aqueous
• room temperature
• reproducible
• fast
• inexpensive
• fancy equipment and glassware not needed
• realistic for an undergrad lab
Our Data
gold nanospheres gold triangular nanodisksand its gold seed (nanospheres)
gold nanorods of 2 sizes anda gold seed (nanospheres)