Abstract
In this paper sensitivity of chemically synthesized titanium dioxide (TiO2) nanoparticles to ultra-violet (UV) radiation is investigated. For this purpose three types of ultra-violet photodetectors were fabricated, one with as-synthesized TiO2 nanoparticles, another one with TiO2 nanoparticles annealed at 600℃, and the third one with TiO2 nanoparticles annealed at 800℃. In each case the annealing time duration was one hour. The photodetectors were fabricated on glass slides where on them a thin layer of fluorine doped tin oxide (FTO) was deposited by spray pyrolysis. The results show that all photodetectors are sensitive to UV radiation where the photodetectors fabricated from annealed TiO2 nanoparticles are more sensitive than the photodetectors fabricated from as-synthesized TiO2 nanoparticles.
Highlights
In recent years, UV photodetectors have got much consideration due to their civilian and military applications
The results show that all photodetectors are sensitive to UV radiation where the photodetectors fabricated from annealed TiO2 nanoparticles are more sensitive than the photodetectors fabricated from as-synthesized TiO2 nanoparticles
The scanning electron microscopy (SEM) result is in contradiction with the grain size of particles which we have found from X-ray diffraction spectroscopy (XRD) patterns, (a) and UV-VIS spectrum of the samples that indicate increase in nanoparticles size with increasing annealing temperature
Summary
UV photodetectors have got much consideration due to their civilian and military applications. UV photodetectors are fabricated from large band gap inorganic semiconductor materials such as: GaN [3,4], CdS [5], diamond [6], or Si [7,8]. These materials are produced using complicated processing steps that are costly and are not appropriate for large scale applications. In this research TiO2 rutile phase nanoparticles were synthesized by a chemical method By using these nanoparticles ultra-violet photodetectors were fabricated that are sensitive to ultra-violet radiation
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