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Full-Text Articles in Materials Chemistry
Toxic Gas Sensing On Nanoporous Carbons, Nikolina-Eleni Travlou
Toxic Gas Sensing On Nanoporous Carbons, Nikolina-Eleni Travlou
Dissertations, Theses, and Capstone Projects
Activated carbons, either synthetic, developed in our laboratory, or commercial, were prepared or further modified, in order to introduce specific heteroatoms such as oxygen, nitrogen and sulfur to their matrices. Chips coated with thin layers of the carbon samples were used for the sensing of gaseous ammonia. They were exposed to continuous cycles of various ammonia concentrations (10-500 ppm), and changes in normalized resistance were analyzed. In all cases linear responses were recorded and the chips reached sensitivities as high as 31%, which are comparable to those of modified graphene-based sensors. The applied specific surface chemical modifications were an effective …
Effect Of Charged Species On The Gradient Properties, Kayesh Ashraf
Effect Of Charged Species On The Gradient Properties, Kayesh Ashraf
Theses and Dissertations
Surface chemical gradients are materials that exhibit continuous, gradually varying chemical or physical properties along and across the length of a substrate. As a result, each point on the gradient surface can represent an individual sample. They are broadly classified as chemical and physical gradients depending upon the properties that the gradient exhibits. A physical gradient involves a continuous variation of physical properties such as surface roughness and film porosity on the micrometer scale. Chemical gradients involve a gradual variation of chemical properties such as polarity, acidity and basicity, etc. Such gradients have found various applications in cell adhesion, nanoparticle …