Nano overview bottom up approach WAMSER

Wamser Portland State University Nanomaterials Course - June 27, 2006... Instrumentation / Imaging• “Quantum Corral” • 48 Fe atoms positioned by the STM used to image them http://www.n

Chemistry and Nanomaterials

Carl C Wamser Portland State University

Nanomaterials Course - June 27, 2006

1996 Nobel Prize

Instrumentation / Imaging

• “Quantum Corral”

• 48 Fe atoms positioned by the STM

used to image them

http://www.nano.gov/html/facts/home_facts.html

conductors transistors integratedcircuits computers

semi-ONAMI

length scale:

Organic LEDs

Structure-Function Correlations (emission wavelengths)

Quantum Effects

Fluorescence of cadmium selenide nanoparticles

• Band gap depends on particle size

(number of atoms in the particle)

Ionic Bonding

• Molecular beaker epitaxy

• Layer-by-layer growth of

polyelectrolytes

• Tom Mallouk Penn State U

http://www.mapr.ucl.ac.be/~jonas/Home_page_AJ/Research/ESA/ESA.html

Ionic / Electrostatic Effects

• A molecular elevator

• Responsive to acid/base

• J D Badjic, et al.,

Accts Chem Res.,

in press.

Ionic / Electrostatic Effects

• Conformational Molecular Rectifiers, A Troisi and M A Ratner,

Nano Lett., 4(4), 591-595 (2004).

Metallic Bonding

melting point: 1337 °K

Gold Statue Gold nanoparticles

Nanoscale gold has different properties than bulk gold, including:

appearance, solubility, and melting point

thiol stabilized gold nanoparticle

Covalent Bonding - Carbon

Single-walled carbon nanotubes:

• armchair - metallic

• zigzag - semiconducting

• chiral - semiconducting

• multi-walled - metallic

Covalent Bonding - Carbon

Carbon nanotubes coated with diamond nanocrystals

π-π Stacking - Liquid Crystals

Charge-Trapping Memory Device

Liu, C-Y.; Bard, A.J.; Acc Chem Res

(1999), 32, 235-234.

Self-Assembled Monolayer

• Monolayer of DDB on

graphite

(didodecylbenzene)

10 nm

Van der Waals Interactions

http://samms.pnl.gov/

Polyporphyrin Interfacial Film (thin)

Polyporphyrin Interfacial Film (thick)

Photosynthetic Reaction Center

http://www.mpibp-frankfurt.mpg.de/~michael.hutter/rcenter.html

( 1988 Nobel Prize )

• Nanochemistry references and websites:

 Handbook of Nanotechnology, B Bhushan, ed (2004)

 Molecular Nanotechnology, D E Newton, ed (2002)

 Integrated Chemical Systems, A J Bard (1994)

 Engines of Creation, K Eric Drexler (1986)

( http://www.foresight.org/EOC/ )

 “There’s Plenty of Room at the Bottom”, Richard Feynman (1959)

( http://www.zyvex.com/nanotech/feynman.html )

 National Nanotechnology Initiative ( http://www.nano.gov/ )

 Nano Letters - ACS Journal ( http://pubs.acs.org/journals/nalefd/ )

 Materials Today - British journal ( http://www.materialstoday.com )