Size-controlled conformal nanofabrication of biotemplated three-dimensional TiO2 and ZnO nanonetworks

Cataloged from PDF version of article.A solvent-free fabrication of TiO2 and ZnO nanonetworks is demonstrated by using supramolecular nanotemplates with high coating conformity, uniformity, and atomic scale size control. Deposition of TiO2 and ZnO on three-dimensional nanofibrous network template is accomplished. Ultrafine control over nanotube diameter allows robust and systematic evaluation of the electrochemical properties of TiO2 and ZnO nanonetworks in terms of size-function relationship. We observe hypsochromic shift in UV absorbance maxima correlated with decrease in wall thickness of the nanotubes. Photocatalytic activities of anatase TiO2 and hexagonal wurtzite ZnO nanonetworks are found to be dependent on both the wall thickness and total surface area per unit of mass. Wall thickness has effect on photoexcitation properties of both TiO2 and ZnO due to band gap energies and total surface area per unit of mass. The present work is a successful example that concentrates on nanofabrication of intact three-dimensional semiconductor nanonetworks with controlled band gap energies

Developing Computer-Assisted Instruction Material About Fossil Fuels and Evaluation of Its Effectiveness

WOS: 000358187500014The purpose of this study is to develop computer-assisted instruction (CAI) material about fossil fuels based on constructivist learning theory and evaluate its effectiveness. The study was conducted via quasi-experimental research design. The sample of the study consisted of 46 third grade pre-service science teachers (PSTs) studying in Elementary Science Teaching Department and taking 'Special Topics in Chemistry' course. In the light of findings obtained, while the participants in the experimental group explain fossil fuels mentioning their formation process, the participants in the control group define fossil fuels as source of energy or fuel/kind of fuel. The PSTs who explained that fossil fuels were used as the source of energy stated that they used fossil fuels mainly for heating and transportation. The PSTs stated that using fossil fuels caused air/environmental pollution, acid rains, depletion of ozone layer, and global warming and they made some suggestions in order to prevent the occurrence of these problems. There is a difference between the PSTs pre-test and post-test results regarding their definitions of fossil fuels, how to use them as the source of energy and their effects on environment. It can be stated that awareness was developed about the use of fossil fuels in favour of experimental group.Giresun UniversityGiresun University [EGT-BAP-A-220413-60]This study is apart of the scientific research project (EGT-BAP-A-220413-60) named 'Developing, Applying and Evaluating Computer Assisted Instruction Materials Related to Energy Sources' which was supported by the Unit of Scientific Research Projects from Giresun University