Browsing by Author "Ajayan, Pulickel Madhavapanicker"

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    Graphite oxide coated particulate material and method of making thereof
    (2016-08-02) Majumder, Mainak; Gao, Wei; Ajayan, Pulickel Madhavapanicker; Narayanan, Tharangattu; Pradhan, Bhabendra K.; Rice University; United States Patent and Trademark Office
    A process for conversion of conventional sand granules (or other particulates) to a ‘core-shell’ adsorbent granules in which GO (or GO-f) coating imparts nano structural features on the surface of the sand granules (or other particulates). Such materials are useful in a variety of engineering applications such as water purification, catalysis, capacitors, proppants, casting, and magnetic shielding.
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    Synthesis and Characterization of 2H and 1T’ Molybdenum Ditelluride (MoTe2)
    (2017-04-21) Zhang, Xiang; Ajayan, Pulickel Madhavapanicker
    Molybdenum ditelluride (MoTe2) is a member of the two-dimensional transition metal dichalcogenides (TMDs) family, which owns unique structures and interesting properties compared to other group VI TMDs. MoTe2 has two different stable structures at room temperature, the semiconducting 2H phase and metallic 1T’ phase. 2H MoTe2 has a small band gap of ~ 1 eV, which is quite similar to that of Si. Besides, due to the energy difference between the two phases is very small, theoretically, it is possible to reversibly switch from 2H phase to 1T’ phase in some conditions. In this thesis, controllable synthesis of 2H and 1T’ MoTe2 is demonstrated. As-grown samples are characterized by optical microscopy, Raman spectroscopy, SEM, AFM, XPS, XRD, UV-vis, etc. We also fabricated MoTe2-based electronic devices and measured their electrical properties.