Band Gap Measurements on Titanium Dioxide Powder Using UV Vis NIR Spectroscopy

7/4/2018

Band Gap Measurements on Titanium Dioxide Powder Using UV/Vis/NIR Spectroscopy

Band Gap Measurements on Titanium Dioxide Powder Using
UV/Vis/NIR Spectroscopy
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Jun 17 2016

Table of Contents
Introduction
Experiment
Results and Discussion
Calculations
Conclusion

Introduction
Measuring the band gap of materials is vital in the nanomaterial, semiconductor, and solar industries. This article illustrates how the
band gap of a material can be established from its UV absorption spectrum (/ads/abmc.aspx?b=8324).
The term “band gap” (https://www.azonano.com/ads/abmc.aspx?b=8324) represents the energy variation between the bottom of
the conduction band to the top of the valence band; electrons are capable of jumping from one band to another. For an electron to
jump from a valence band to a conduction band, it needs a band gap energy - a speci c minimum quantity of energy for the transition.
Figure 1 illustrates an image of the band gap.

Figure 1. Explanation of band gap.
The measurement of the band gap is vital in the nanomaterial (/ads/abmc.aspx?b=8324) and semiconductor sectors. The insulators’
band gap energy is large (>4 eV); however, it is lower for semiconductors (