Timothy C. King

Bio: Timothy C. King is an academic researcher from University of Cambridge. The author has contributed to research in topics: Latin Americans & Thin film. The author has an hindex of 10, co-authored 16 publications receiving 371 citations.

Formation of Ti28Ln Cages, the Highest Nuclearity Polyoxotitanates (Ln=La, Ce)

Abstract: The solvothermal reactions of Ti(OEt)(4) with LnCl(3) (Ln = La, Ce) produced new Ti(28) Ln cages, in which the Ln(3+) ions are coordinated within a metallocrown arrangement, which represents the highest nuclearity cages of this type (see figure).

Scalable one-step assembly of an inexpensive photoelectrode for water oxidation by deposition of a Ti- and Ni-containing molecular precursor on nanostructured WO3.

Abstract: Water oxidation is a key challenge to a future energy technology that utilizes solar energy to split water or to reduce carbon dioxide.[1] Photocatalyzing this demanding four-electron, four-proton process efficiently remains an unresolved task and a topic of much current interest.[2] A photo-O2 evolution system requires the efficient combination of light harvesting, multi-charge separation and water-oxidation catalysis; all of which are coupled superbly in natural photosynthesis.[3]

Theory and practice: bulk synthesis of C3B and its H2- and Li-storage capacity.

Abstract: Previous theoretical studies of C3B have suggested that boron-doped graphite is a promising H2- and Li-storage material, with large maximum capacities. These characteristics could lead to exciting applications as a lightweight H2-storage material for automotive engines and as an anode in a new generation of batteries. However, for these applications to be realized a synthetic route to bulk C3B must be developed. Here we show the thermolysis of a single-source precursor (1,3-(BBr2)2C6H4) to produce graphitic C3B, thus allowing the characteristics of this elusive material to be tested for the first time. C3B was found to be compositionally uniform but turbostratically disordered. Contrary to theoretical expectations, the H2- and Li-storage capacities are lower than anticipated, results that can partially be explained by the disordered nature of the material. This work suggests that to model the properties of graphitic materials more realistically, the possibility of disorder must be considered.

Superconductivity in the intercalated graphite compounds C6Yb and C6Ca

Abstract: This thesis concerns the discovery of superconductivity in the intercalated graphite compounds C6Yb and C6Ca. A novel technique for synthesis of these intercalates has been developed, and is presented in detail. These two materials are shown to superconduct at 6.5K and 11.5K respectively. The superconductivity is demonstrated by measurements of the magnetisation and resistivity. Initial measurements of the superconducting transition of these materials as a function of pressure shows an increase in the transition with increasing pressure.

C3N—A 2D Crystalline, Hole-Free, Tunable-Narrow-Bandgap Semiconductor with Ferromagnetic Properties

Abstract: Graphene has initiated intensive research efforts on 2D crystalline materials due to its extraordinary set of properties and the resulting host of possible applications. Here the authors report on the controllable large-scale synthesis of C3 N, a 2D crystalline, hole-free extension of graphene, its structural characterization, and some of its unique properties. C3 N is fabricated by polymerization of 2,3-diaminophenazine. It consists of a 2D honeycomb lattice with a homogeneous distribution of nitrogen atoms, where both N and C atoms show a D6h -symmetry. C3 N is a semiconductor with an indirect bandgap of 0.39 eV that can be tuned to cover the entire visible range by fabrication of quantum dots with different diameters. Back-gated field-effect transistors made of single-layer C3 N display an on-off current ratio reaching 5.5 × 1010 . Surprisingly, C3 N exhibits a ferromagnetic order at low temperatures (<96 K) when doped with hydrogen. This new member of the graphene family opens the door for both fundamental basic research and possible future applications.

Entrepreneurship and Economic Development: The Problem Revisited

Abstract: Iam grateful to Alice Amsden, Martin Bronfenbrenner, Christopher Clague, David Felix, Joseph Reid, Kazuo Sato, and referees of this Journal for insightful comments on an earlier draft of this paper. I also thank the Faculty Research Program of the Columbia Business Schoolfor financial support, andjohn Millarfor able research assistance. I bear sole responsibility for any deficiencies in the paper.