Indium selenide thin film preparation by sol–gel technique

Preparation and characterization of In–Se compound thin films prepared by sol–gel methods on glass substrate have been studied. X-ray diffraction analyses and optical transmission spectrum of In–Se compound thin film samples show that the fabricated sol–gel In–Se thin films features formed mainly as an In₂Se₃ crystal structure. From transmission spectra of In–Se thin films band gap energy were estimated approximately as ∼1.24 eV.     

Influence of γ-radiation on photoconductivity spectra of InSe monocrystals

The influences of γ-radiation with photon energy hν ～ 1.23 MeV on photoconductivity of layered InSe crystals have been studied. The photosensitivity is increased because of small doses of γ-radiation. It has been observed that γ-radiation makes the impurity peaks in the photoconductivity spectra disappear. This process is attributed to the phenomenon of irradiation annealing characterized by formation of the complexes including fine impurity centers and specific γ-radiation defects.     

Preparation of Ga<Subscript>2</Subscript>Se<Subscript>3</Subscript> thin films by sol–gel technique

In this study we describe the preparation of Ga₂Se₃ semiconductor compound thin films by sol–gel method for different crystal formation temperatures. The films were characterized by X-ray diffraction analyses (XRD), UV–visible spectrometer, and scanning electron microscope (SEM). The XRD spectrum showed that the formation of Ga₂Se₃ crystals were between 743 and 823 K. The thin film crystals that were formed at 773 K corresponded to the β phase and the preferred crystal structure was monoclinic. The value of band gap from optical absorption spectra for the Ga₂Se₃ thin films was estimated to be about E _g ~ 2.56 eV. The thickness of the one-coat Ga₂Se₃ thin films, which was measured by a Spectroscopic Ellipsometer, was about ~200 nm. The average grain sizes of scattered particles were within the limits between 200 and 500 nm.     

Conversion of Straight-Run Naphtha to C5−C6 Alkanes on Co(Ni)/HZSM–5/SO 4 2- —ZrO2 Composite Catalysts

Russian Journal of Applied Chemistry - The conversion of straight-run naphtha on composite catalytic systems containing HZSM-5 zeolite modified with 0.4 wt % Co or Ni and 15% SZ (10% SO 4 2-...