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- Conducting is flow of e- from VB through the C.B.
* In metals, CB is linked to VB directly
- Semiconductors require some energy input to overcome a gap between VB and CB
- Insulators have a band gap too large to overcome, thus they insulate against e- conduction.
Wavelength (λ) or Frequency (ν)
c = λν (c is the speed of light, 3.0x108 m/s)
A photon is a packet of energy (E)
E = hν = h c/ λ (h= 6.6 x 10-34 J s)
E = 2.0x10-25/ λ (hc= 2.0 x 10-25 J m)
As size decreases, the electrons of the nanoparticle become confined to a smaller space, and the band gap increases
-Refining Al requires a large amount of electricity, which was not available in sufficient quantities until the late 19th century
SOME DATA MAY NOT BE 100% ACCURATE
For a real test I would use more materials and dataQuestions Continued
Which material would be best suited for:
Spacecraft reentry tiles
Ferris Wheel tie-rods
Tennis racket frame
CdSe Quantum dots, 1.5 - 2 nm in size
nλ = d(sinθ)