This research aims to understand the influence of ZnO and NiO molarity towards its optical and morphological properties. ZnO/NiO was synthesized using solvothermal method with ZnO and (Ni(NO)3)2.6H2O as its main ingredients and dissolved in ethanol. The synthesis of ZnO/NiO using solvothermal method was carried out by modifying the variation of ZnO concentration with the ratio of ZnO and NiO were 1:1, 2:1, and 3:1. ZnO/NiO was used as a semiconductor material which will be analysed for optical properties that occur, one of which was band gap energy. The result was then characterized by X-Ray Diffraction (XRD) showed that the crystal size of the sample at 3:1 is the largest. Furthermore, the Fourier Transform Infrared Spectroscopy (FTIR) analyst indicated that the sample corresponds to C=C and C-H bonds. Moreover, the UV – Vis analyst showed that the absorption range is between 300-400nm indicated the extended UV-Vis absorption property of mixed oxide.
Graphene is a material that has amazing electrical and optical properties. This research will discuss the effect of adding Cobalt Sulfide (CoS) on the reduction of graphene oxide (RGO) by using variations in the CoS ratio to improve the electrochemical properties of RGO. Graphene oxide (GO) is reduced by adding (Co(NO3)2.6H2O, thiourea (CH4NS) and added with ethylenediamine, then all materials reacted via solvothermal process. RGO that has been successfully synthesized will be characterized to determine the structural and chemical characteristics of the synthetic material by using X-Ray Diffraction (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscopyy (SEM), and Spectrophotometer UV-Vis. According to the results characterizations there are many differences on the optical characteristic and morphology on each phase of GO, RGO and RGO CoS.
<p class="Abstract">Physics is one of a branch of science which uses much of mathematical concept. Usually, the concept of physics is expressed in a mathematical equation; it will make physics easier to be understood. Therefore, the students need to understand about mathematical modelling to help them understand physics. Students who take fundamental physics and physics laboratory course required to understand the concept of feedback that is mathematically expressed in differential equations. However, most of the students have not been taught the concept of differential equations at early semester. Therefore, we are interested in reviewing the use of mathematical modelling with a spreadsheet in the case of feedback that is integrated with laboratory practice. The results of this study indicate that students gave positive perceptions and improve their ability in understanding the concept of feedback that is mathematically expressed in the differential equation.<strong></strong></p>
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