In this work, polyvinylpyrrolidone (PVP), multi-walled carbon nanotubes (MWCNTs) nanocomposite was prepared and hybridized with Graphene (Gr) by the solution casting method.  The morphological and electrical properties were investigated by field effect scanning electron microscopy (FESEM) images, portraying a uniform dispersion of graphene within the PVP-MWCNT nanocomposite. The AC conductivity increased from (1.45552) to (2.34812) (Ω cm)-1 with the use of nanocomposite. The increasing continues for the AC conductivity after hybridized with graphene up to (7.20641) (Ω cm)-1. In addition, the performances of the prepared samples for gas sensor application have been investigated. It was seen that the sensitivity analysis portrayed higher value for the nanocomposite hybridized with Gr (S=2.2 and 5.4%) as compared to the pure sample (MWCNTs). Finally, the recovery and response times were increased when the temperature increased due to the increment of the adsorption of the gas that resulted from the free electrons.

In this work, polyvinylpyrrolidone (PVP)/ Multi-walled carbon nanotubes (MWCNTs) nanocomposites were prepared with two concentrations of MWCNTs by casting method. Morphological, structural characteristics and electrical properties were investigated. The state of MWCNTs dispersion in a PVP matrix was indicated by Field Effect-Scanning Electron Microscopy (FESEM) which showed a uniform dispersion of MWCNTs within the PVP matrix. X-ray Diffraction (XRD) indicate strong bonding of carbonyl groups of PVP composite chains with MWCNTs. Fourier transfer infrared (FTIR) studies shows characteristics of various stretching and bending vibration bands, as well as shifts in some band locations and intensity changes in others. Hall effect was studied to test the type of charge carriers which was shown to be P-type. The electrical conductivity was shown increased for the pure PVP and pure MWCNT from (2.047×10-5) (Ω.cm)-1 and (3.683×101) (Ω.cm)-1 to (2.51×102 and 2.36×102) (Ω.cm)-1for both concentrations of nanocomposites, which indicate the conductivity was enhancement by using the carbon nanotubes.

This study aimed to develop a ‘Gravigame’ in Kepler’s law and to evaluate its usability among physics trainee teachers at one of the public universities in Malaysia. This study uses a developmental research design by applying the ADDIE model. The research sample consisted of 30 trainee physics teachers who were randomly selected from seven and eight semesters’ students. Two research instruments were used, namely the expert validation form and usability questionnaire adapted from the USE Questionnaire. Data from the usability questionnaire were analysed descriptively using mean and standard deviation (s.d). Data showed that the developed game has a high validity with 94% of expert agreement. The usability data analyses showed that the ‘Gravigame’ has an overall of mean score 3.81 (s.d = 0.282). The three constructs that represent usability namely usefulness, ease of use and satisfaction are at a good level with the mean score of 3.80, 3.76 and 3.86 respectively. In conclusion, the research has successfully developed a validated ‘Gravigame’ that can be used as a teaching aid. For implication, the ‘Gravigame’ game is suitable for classroom learning, making it easier for teachers to assess students and helping students understand the subtopic of Kepler’s law.