The Effect of Silver Nanoparticles on the Photodetecting Properties of the TiO 2 /Graphene Oxide Nanocomposite
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The Effect of Silver Nanoparticles on the Photodetecting Properties of the TiO2/Graphene Oxide Nanocomposite E. V. Seliverstovaa, *, N. Kh. Ibrayeva, **, and A. Zh. Zhumabekova a Institute
of Molecular Nanophotonics, Buketov Karaganda State University, Karaganda, 100028 Kazakhstan *e-mail: [email protected] **e-mail: [email protected] Received April 21, 2020; revised April 30, 2020; accepted May 20, 2020
Abstract—The effect of silver nanoparticles on the optoelectronic and photoelectric properties of a nanocomposite material based on graphene oxide (GO) and TiO2 was studied. It was shown by electron microscopy and Raman spectroscopy that during hydrothermal synthesis, A TiO2–GO nanocomposite material is formed as a result of the hydrothermal synthesis, as shown by electron microscopy and Raman spectroscopy. The absorption spectrum of the nanocomposite is shifted to the long-wavelength region relative to the absorption spectrum of TiO2. The current–voltage characteristics of photodetectors based on TiO2–GO nanocomposite films without Ag nanoparticles and TiO2–GO nanocomposite films with addition of Ag nanoparticles increase relative to the current–voltage characteristics of pure titanium dioxide by factors of 2 and 7.5, respectively. The optoelectronic parameters of the relevant devices also increase, which is associated with an increase in the mobility of charge carriers in nanocomposite films. Keywords: nanocomposite, graphene oxide, titanium dioxide, photodetector, Ag nanoparticles DOI: 10.1134/S0030400X20090192
INTRODUCTION Transition metal oxides offer great opportunities for the optoelectronic applications for which high sensitivity to ultraviolet radiation is required. Ultraviolet photodetectors can be used for both civilian and military purposes, including biological and chemical analyses, as well as environmental monitoring [1, 2]. Ultraviolet photodetectors are usually made of widegap semiconductor materials, such as TiO2 [3–5], ZnO [6], and ZnS [7]. Titanium dioxide TiO2 is among the most studied semiconductors due to the high promise of its application in photocatalysis, photovoltaic cells, and gas sensors [8–10]. Titanium dioxide with a band gap of 3.2 eV is sensitive to light with wavelengths below 380 nm. This allows one to use it in the manufacture of UV-range photodetectors. Many authors have shown that the doping of TiO2 with carbon nanostructures gives rise to increases in both the sensitivity and performance of devices based on it. With this aim, carbon materials of various nature, such as activated carbon, carbon black, carbon fibers, and carbon nanotubes, were studied [11, 12]. However, the most promising materials for practical applications are, in our opinion, graphene oxide (GO) and its derivatives [11–16]. In [17], we demonstrated that the addition of GO and reduced GO to TiO2 leads to a nearly ten-fold increase in its photocat-
alytic activity, which is the result of an increase in the adsorption characteristics, and an improvement in the photoelectric param
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