Browsing by Author "Metzger, Andrew"
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Item Bandgap engineering of carbon quantum dots(2018-10-02) Tour, James M.; Ye, Ruquan; Metzger, Andrew; Stavinoha, Macy; Zheng, Yonghao; Rice University; United States Patent and Trademark OfficeEmbodiments of the present disclosure pertain to scalable methods of producing carbon quantum dots with desired bandgaps by the following steps: exposing a carbon source to an oxidant at a reaction temperature, where the exposing results in the formation of the carbon quantum dots; and selecting a desired size of the formed carbon quantum dots. In some embodiments, the selecting occurs by at least one of separating the desired size of the formed carbon quantum dots from other formed carbon quantum dots; selecting the reaction temperature that produces the desired size of the formed carbon quantum dots; and combinations of such steps. The desired size of carbon quantum dots can include a size range. The methods of the present disclosure can also include a step of purifying the formed carbon quantum dots prior to selecting a desired size.Item Synthesis and Applications of Carbon Materials(2018-03-05) Metzger, Andrew; Tour, James MThe synthesis and applications of carbon-containing materials is discussed. Carbon materials discussed range from conductive polymer-coated minerals to polymer-functionalized graphene nanoribbons to graphene quantum dots. Applications range from wellbore reinforcement to conductive drilling fluids to lanthanide sensitization. In the first chapter, the preparation and use of polyaniline-coated barite as a weighting agent in conductive drilling fluids is discussed. In the second chapter, microwave-assisted curing of thermosets accelerated by functionalized graphene nanoribbon is discussed. In the third chapter, the synthesis of graphene quantum dots via nitric acid oxidation of coal is discussed. In the fourth chapter, the sensitization of lanthanides by graphene quantum dots is discussed.