No abstract

at a low cost is another advantage in using GO for such applications. [10] However, the oxygen functional groups and lattice vacancies present in GO are accountable for opening up a large bandgap in the graphene lattice, which makes it electrically insulating. [11] Many deoxygenation or reduction strategies have been established to improve the graphitic structure and the electrical conductivity in GO, yet its quality is inferior to pristine or chemical vapor deposition (CVD) grown graphene. Chemical reduction (CR) of GO using different types of chemicals have been reported ranging from harmful chemicals to green reducing agents. [12][13][14] However, the CR is not sufficient to obtain graphene-like films from GO, because the vacancy type defects cannot be repaired. On the other hand, thermal annealing can effectively remove most of the oxygen functionalities resulting in highly conductive reduced graphene oxide (RGO) films. [15,16] Yet, carbon etching from the graphitic lattice along with the oxygen groups, as CO 2 and CO molecules, and rearrangement of the carbon atoms in the basal plane leading to Stone-Wales type defects are inevitable. [17] All these defects degrade the structural and electrical properties of the RGO films and hence, the overall quality. Research has also been done to obtain high-quality RGO films by lattice defect restoration using additional carbon sources, such as acetylene, ethanol, and methane during thermal annealing. [18][19][20] Although this method proves that the vacancies are being repaired, still the quality is inferior to graphene since carbon etching can occur simultaneously with the restoration. Recently, Yoon et al. have reported in situ deoxygenation and graphitization of GO using Fischer-Tropsch reaction catalyst (CuFeO 2 ) to obtain high-quality few-layered (5-10 layers) RGO with an I D /I G ratio of 0.19 and a crystallite size of 95.57 nm. [21] Yet, the total process time can be longer, as 12 h, involving several steps. Voiry et al. has reported a microwave-assisted reduction of GO into high-quality RGO with a lower I D /I G ratio, a large crystallite size (180 nm), and a large distance between defects (38 nm). [22] However, during microwave treatment, care should be taken because of the large volume expansion accompanied by the release of gases and violent sparking. Even though many efforts have been taken in attaining high-quality RGO films, the Here, a facile two-step reduction method is introduced to fabricate reduced graphene oxide (RGO) films with remarkable structural qualities. Many attempts are made to fabricate RGO with high structural qualities resembling pristine graphene. However, designing a reduction method to obtain highquality RGO more productively is highly desirable. To address this matter, in the present work, monolayer graphene oxide films are, at first, chemically reduced using a mixture of hydroiodic acid and trifluoroacetic acid vapor within a few minutes. Second, the films are reduced thermally at 800 °C for 30 min with ethanol, to repair the latti...

The use of various types of information devices equipped with touch panels has been increasing. When these devices are used directly with fingers, the devices become dirty owing to sweat and oil from users. Therefore, there is considerable interest in keeping the surfaces of devices free from fingerprints and dirt. Antifouling films and coatings are being developed for this purpose. In addition, a method of changing the surface shape by adding a microstructure to a material surface has been developed. The purpose of this study is to add the antifouling function to glass surfaces using a mechanical removal process. We attempted to change the surface shape by processing a material surface directly. The processing method was microslurry-jet (MSJ) processing, which is a mechanical removal method. In addition, a masking process was used to create microsurface structures. As an example, we evaluated the anti-fingerprint glass created by these processing methods. Microsurfaces were successfully created on the glass surface through the combination of the masking process and MSJ processing. Moreover, the visibility of the created glass, surface characteristics, friction characteristics, and the adhesion of stains were evaluated. With respect to visibility, surface characteristics, and adhesion, it was possible to observe the changes in surface characteristics due to the microsurfaces. With regard to friction characteristics, differences in surface patterns were found for individual subject data.

No abstract

No abstract