“The structural or the bonding aspect of graphite and carbon nanotubes allows their use as semiconductors whereas diamond is an electrical insulator” is to be discussed. Concept introduction: The wrapping of graphene sheet around itself leads to the formation of cylinders with diameters on the scale of nanometres, which are called carbon nanotubes. Single-walled nanotubes are stronger than multiple-walled ones. Nanotubes are made up of carbon atoms only. Semiconductors are solids that have a conductivity that lies between that of conductors and insulators. In semiconductors, the gap between the conduction band and the valence band is small, so electrons may jump from the valence band to the conduction band.

Question

Want to see the full answer?

Answer 1

Question

Chapter 12, Problem 26QP

Interpretation Introduction

Interpretation:

“The structural or the bonding aspect of graphite and carbon nanotubes allows their use as semiconductors whereas diamond is an electrical insulator” is to be discussed.

Concept introduction:

The wrapping of graphene sheet around itself leads to the formation of cylinders with diameters on the scale of nanometres, which are called carbon nanotubes.

Single-walled nanotubes are stronger than multiple-walled ones.

Nanotubes are made up of carbon atoms only.

Semiconductors are solids that have a conductivity that lies between that of conductors and insulators.

In semiconductors, the gap between the conduction band and the valence band is small, so electrons may jump from the valence band to the conduction band.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Photochemical smog is formed in part by the action of light on nitrogen dioxide. The wavelength of radiation absorbed by NO2 in this reaction is 197 nm.(a) Draw the Lewis structure of NO2 and sketch its π molecular orbitals.(b) When 1.56 mJ of energy is absorbed by 3.0 L of air at 20 °C and 0.91 atm, all the NO2 molecules in this sample dissociate by the reaction shown. Assume that each absorbed photon leads to the dissociation (into NO and O) of one NO2 molecule. What is the proportion, in parts per million, of NO2 molecules in this sample? Assume that the sample behaves ideally.

Correct each molecule in the drawing area below so that it has the skeletal ("line") structure it would have if it were dissolved in a 0.1 M aqueous solution of HCI. If there are no changes to be made, check the No changes box under the drawing area. No changes. HO Explanation Check NH, 2 W O :□ G ©2025 M unter Accessibility

An expression for the root mean square velocity, vrms, of a gas was derived. Using Maxwell’s velocity distribution, one can also calculate the mean velocity and the most probable velocity (mp) of a collection of molecules. The equations used for these two quantities are vmean=(8RT/πM)1/2 and vmp=(2RT/M)1/2 These values have a fixed relationship to each other.(a) Arrange these three quantities in order of increasing magnitude.(b) Show that the relative magnitudes are independent of the molar mass of the gas.(c) Use the smallest velocity as a reference for establishing the order of magnitude and determine the relationship between the larger and smaller values.