Nanomaterials

Question 1

Materials that are at least with one dimension (width, length or height) sized on a nanoscale.

Answer 1

Nanomaterials

Question 2

Objects with all three external dimensions at the nanoscale.

Answer 2

Nanoparticles

Question 3

Range of the nanoscale is __ - __ nm

Answer 3

1-100 nm

Question 4

1 nm = 1 x __ m

Answer 4

10^-9

Question 5

_____ is the engineering and manipulation of materials at the molecular level.

Answer 5

Nanotechnology

Question 6

Materials that are converted to nanoscale through processes.

Answer 6

Man-made Nanoparticles

Question 7

Volcanic ash, soot from forest fires and dust are examples of _____ nanoparticles.

Answer 7

Naturally-occurring

Question 8

Engineered nanomaterials/nanoparticles are intentionally produced and designed with very specific properties related to _____ , _____ , _____ , and ______.

Answer 8

Shape, Size, Surface properties, Chemical properties

Question 9

Particles created at the nanoscale have different _____ and _____ properties than larger particles of the same material.

Answer 9

Chemical, Physical

Question 10

Materials with structure at the nanoscale often have unique _____ , _____ , or _____ properties.

Answer 10

Optical, Electronic, Mechanical

Question 11

The behavior of nanomaterials may depend more on _____ than particle composition itself.

Answer 11

Surface Area

Question 12

_____ is one of the principal factors that enhance reactivity, strength, and electrical properties.

Answer 12

Relative Surface Area

Question 13

_____ nanomaterials have unique electrical, optical, photonic and mechanical properties.

Answer 13

Semiconductor

Question 14

Semiconductor _____ are tiny light-emitting particles on the nanometer scale.

Answer 14

Nanocrystals

Question 15

Effects of particle size in the electronic properties are _____ and _____.

Answer 15

Effect of Surface Area, Quantum Confinement

Question 16

It is basically defined as the energy band that comprises of valence electrons present in the outermost shell of an atomic structure.

Answer 16

Valence Band

Question 17

It is defined as that energy band that consists of free electrons that are responsible for conduction.

Answer 17

Conduction Band

Question 18

Valence band and conduction band are separated by a certain amount of energy known as the _____.

Answer 18

Forbidden Energy Gap

Question 19

The gap between bands determines whether a substance is a/an _____ , a/an _____ , or a/an _____.

Answer 19

Metal, Semiconductor, Insulator

Question 20

As the particle gets _____ , the band gap gets _____.

Answer 20

Smaller, Larger or Larger, Smaller

Question 21

Among elements, only _____ , _____ , and _____ , all of which have 4 valence electrons, are semiconductors.

Answer 21

Silicon, Germanium, Graphite

Question 22

_____ have no band gap.

Answer 22

Metals

Question 23

_____ have small band gap.

Answer 23

Semiconductors

Question 24

_____ have the largest band gap.

Answer 24

Insulators

Question 25

Smaller particle size absorbs light of a _____ frequency and _____ wavelength.

Answer 25

Higher, Lower

Question 26

As the crystals are made smaller, the material progressively changes color until it looks _____ because no visible light is absorbed.

Answer 26

White

Question 27

Larger particle size absorbs light of a _____ frequency and _____wavelength.

Answer 27

Lower, Higher

Question 28

_____ can absorb most of solar spectrum. Can be used in low-cost organic solar cells because of its semiconductor property.

Answer 28

Fullerene

Question 29

_____ have great mechanic properties and are the strongest one-dimensional material.

Answer 29

Carbon Nanotubes

Question 30

_____ has extremely high tensile strength, conducts electricity, transparent, and is the thinnest two-dimensional material in the world.

Answer 30

Graphene

Question 31

Semiconductor particles with diameters
in size range of 1 - 10nm are called
_____.

Answer 31

Quantum Dots

Question 32

Particles with large band gaps (Eg > 3.0 eV) need high-energy _____ light to excite electrons into the conduction band.

Answer 32

Ultraviolet

Question 33

Particle with small band gaps (Eg = 0.5 eV) absorbs all wavelengths of _____ light.

Answer 33

Visible