d) Briefly, explain why the bandgap of graphene remains unaltered with functionalization of its edges. e) How can graphene doped with gaseous species be returned to un-doped state?
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- Give two typical applications where the band and bond model is used.(a) Answer parts i), i),ii) and iv) side by side so that the relative scales are obvious, include electron occupancy. (i) Draw the band structure of potassium (ii) Draw the band structure of silicon (iii) Draw the band structure of carbon (iv) Draw the band structure of germanium (b) Based on your diagrams, state the order of electrically conductivity for the four elements at 300 K, from the smallest to the highest - explain your choice. Magnesium has an electron configuration of 1s? 2s? 2p° 3s?. Using band diagrams explain why this element is considered an (c) electrical conductor. (d) improve its ability to conduct electricity. What type of extrinsic semiconductor results and explain how the addition of arsenic increases conductivity (use diagrams if necessary)? A small amount of arsenic is added to a sample of silicon to (i) Gallium phosphide (GaP) has a band gap of 2.26 eV. Calculate the wavelength of light emitted in nm (1 eV = 1.6 x 1019 J). (e) (ii) It is required for a…1. "Band structure" of "Hatom chain" and "H mole chain" are drawn as "graphs" and "intermediate process".Describe it in detail.2. Describe "SP2 and SP3 bonding" and describe "crystal structure" according to each "bonding structure" in "carbon crystal structure"Describe the 'difference and reason for electrical conductivity' accordingly.
- Why are these bravais lattices the same? B-monoclinic and primitive (P)-monoclinic (if b is the unique axis) base-centered (C)-monoclinic and body-centered (I) monoclinic (if b is the unique axis)4.) Carbon and graphite are allotropes of Carbon. Between graphite and diamond, which one is a good conductor of electricity and which one is not? Support answer with an explanation. (Limit answer to not more than 4 sentences)What form of sulfur do all of its allotropes revert to at room temperature? Rhombic Monoclinic Elemental Diatomic
- Use molecular orbital diagrams to explain the differences between graphite and diamond.Carbon can exist in many forms known as allotropes. Two such allotropes are diamond and graphite. Unlike diamond, graphite conducts electricity. This is because... In diamond, all the electrons are in sigma bonds which allow conductivity of electricity. In graphite, there are unhybridized p-orbitals that extend over the entire sheet forming a delocalized pi (n) bonding network where electrons are free to move. O In graphite, there are hybrid orbitals used for bonding that contain electrons. O In diamond, the bonding electrons have enough energy to move and can therefore conduct electricity. O In graphite, the bonds are 1090, which is perfect for electricity conduction. Question 23 6.45 Boron nitride is the second hardest substance known (next to diamond). It has a very high melting point but does not conduct electricity. What typWhy is Br3SiH distorted from the expected 109.5o tetrahedral bond angle, while SiBr4 is not?
