Abstract
Recently, sophisticated technologies are applied to design a certain surface nature that can have superhydrophobic properties. Thus, a simple spray technique was introduced to prepare a superhydrophobic surface using rGO with Ni-S system (rGO-Ni) by using NiSO4 catalyst under microwave irradiation at various reaction times of 5, 10, 20, and 30 min. The GO reduction was conducted at a fixed Ar/H2 ratio, a flow rate of 0.4 L/min, microwave power of 720 W, and a mass of 0.5 g. GO powder with nickel sulfate catalyst was treated under Ar/H2 (4:1) mixture for GO reduction, where Ar and H2 were expected to prevent the rebinding of oxygen released from GO. The result of XRD and Raman measurement confirms that rGO-Ni prepared at reaction time 20 min exhibit the highest reduction of GO and the presence of various Ni-S crystal structures such as NiS, NiS2, Ni3S2, and Ni3S4 due to decomposition of NiSO4. The rGO-Ni coating performance shows superhydrophobic nature with a contact angle of 150.1°. The AFM images show that the addition of nickel to rGO produces a quasi-periodic spike structure, which increases the superhydrophobicity of the r-GO-Ni coated glass with a contact angle of 152.6°. It is emphasized that the proposed simple spray coating using rGO-Ni provides a more favorable option for industry application in obtaining superhydrophobic surfaces.
Highlights
Graphene and its derivative compounds such as graphene oxide (GO) and reduced graphene oxide recently have become promising materials that are entitled to be developed because of their properties, such as high electrical conductivity, thermal conductivity, surface area, and tensile strength [1,2,3,4]
The peak at 1060 and at 1625 cm−1 are reduced graphene oxide (rGO) with Ni-S system (rGO-Ni) prepared with 0.5 g GO, flowrate 0.4 L/min, microwave power of 720 W, and onecorrespondingly identified as C-O and C=C bonds
Our study shows that the superhydrophobic surface of the sample can be prepared by deposition of nickel-doped rGO using a simple spray technique, which is a more practical use for large-area coating of the surface and, more favorable for the industry
Summary
Graphene and its derivative compounds such as graphene oxide (GO) and reduced graphene oxide (rGO) recently have become promising materials that are entitled to be developed because of their properties, such as high electrical conductivity, thermal conductivity, surface area, and tensile strength [1,2,3,4]. These properties enable graphene to be used for various applications such as photovoltaic cells, sensors, chemical energy storage devices, transistors, transparent electrodes, and coatings.
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