Synthesis of graphene oxide and copper phthalocyanine, AC electrical characterization and tuning the bandgap of RGO-CuPc
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Synthesis of graphene oxide and copper phthalocyanine, AC electrical characterization and tuning the bandgap of RGO-CuPc composite Mohammad Esmaeil Azim Araghi1 and Elnaz Omman1,* 1
Applied Physics Division, Physics Department, Kharazmi University, 43 Mofateh Avenue, Tehran, Iran
Received: 9 September 2020
ABSTRACT
Accepted: 9 November 2020
Graphene oxide (GO) was synthesized in our laboratory by the improved Hummer’s method. Reduced graphene oxide/Copper Phthalocyanine (RGOCuPc) composite was prepared through the chemical reduction of GO by Hydrazine hydrate. This composite was analyzed by FT-IR, UV–vis spectroscopy, FESEM microscopy, and the results showed that CuPc molecules were successfully attached on RGO sheets by p-p intermolecular interaction. Also, UV–vis spectroscopy results showed that the tuning of the bandgap is applicable for RGO-CuPc composite. Sandwich devices of RGO-CuPc thin film with aluminum electrodes (Al/RGO-CuPc/Al) were fabricated to investigate the AC electrical properties of RGO-CuPc composite over the frequency range of 102– 105 Hz and temperature range of 298–393 K. The band theory is applicable to explain the thin film conduction mechanism. Also, this composite acts as a semiconductor with high electron mobility.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In the last two decades, graphene, graphene oxide (GO), and carbon nanotubes (CNTs) were three precursor allotropes of carbon in nanotechnology. Modern graphene science has engendered a revolution in technology. Graphene structurally compasses a planner sp2 hybridized carbon in a hexagonal skeleton [1]. The mechanical performances to fabricate durable materials, controllable electronics properties, chemical stability nature, optical transparency, thermal conductivity are some of its outstanding superiority to be utilized in different fields of science
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https://doi.org/10.1007/s10854-020-04866-7
[2]. There are still some challenges to produce purely graphene with a preeminent structural quality in commercialization aspects and massive level. Some of these approaches are mechanical cleavage, chemical, plasma and liquid phase exfoliation of graphite, epitaxial growth, graphite oxidation and reduction, and chemical vapor deposition (CVD) [3–8]. GO, the oxidized form of graphene possesses some functional groups which are distributed in lamellae and render it unique physicochemical features which leads to progress in comparison with other 2D materials such as hexagonal boron nitride [9] and TMDCs [10].
J Mater Sci: Mater Electron
GO remarkable peculiarities have attracted a great deal of attention in Nano electronics, optoelectronics, catalysis, biology applications, energy conversion devices, solar cells, photovoltaic, purification materials, and membranes [11–18]. Behavior of CNTs (SWCNT, DWCNT, MWCNT) is metallic or semiconductor in nature. Their conduction mechanisms are explained by variable range hopping models and tunneling mo
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