David B Geohegan Group Leader, Functional Hybrid Nanomaterials, Center for Nanophase Materials Sciences Contact geohegandb@ornl.gov | 865.241.6159 All Publications In situ edge engineering in two-dimensional transition metal dichalcogenides... Anomalous interlayer vibrations in strongly coupled layered PdSe2... Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photolum... The growth and assembly of organic molecules and inorganic 2D materials on graphene for van der Waals heterostructures... Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites In Situ X-Ray Studies of Crystallization Kinetics and Ordering in Functional Organic and Hybrid Materials... In situ edge engineering in two-dimensional transition metal dichalcogenides A hybrid optimization algorithm to explore atomic configurations of TiO2 nanoparticles... Bottom up synthesis of boron-doped graphene for stable intermediate temperature fuel cell electrodes... PdSe 2 : Pentagonal Two-Dimensional Layers with High Air Stability for Electronics... PdSe2: Pentagonal 2D Layers with High Air Stability for Electronics... Bromine substitution improves excited-state dynamics in mesoporous mixed halide perovskite films... Enhancing Ion Migration in Grain Boundaries of Hybrid Organic-Inorganic Perovskites by Chlorine... Suppression of Defects and Deep Levels Using Isoelectronic Tungsten Substitution in Monolayer MoSe2... Perovskite Materials: Solar Cell and Optoelectronic Applications... Ultrafast Excited-State Dynamics in Shape- and Composition-Controlled Gold-Silver Bimetallic Nanostructures ... Enhancing Ion Migration in Grain Boundaries of Hybrid Organic–Inorganic Perovskites by Chlorine Edge-controlled Growth and Etching of Two-Dimensional GaSe Monolayers... PdSe2: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics Tilt Grain Boundary Topology Induced by Substrate Topography Ultrafast Carrier Dynamics in Bimetallic Nanostructures-Enhanced Methylammonium Lead Bromide Perovskites... Nanostructured carbon electrocatalyst supports for intermediate-temperature fuel cells: Single-walled versus multi-walled str... Observation of Nanoscale Morphological and Structural Degradation in Perovskite Solar Cells by In-Situ TEM... Ultrafast Dynamics of Metal Plasmons Induced by 2D Semiconductor Excitons in Hybrid Nanostructure Arrays... Ultrafast Charge Transfer and Hybrid Exciton Formation in 2D/0D Heterostructures... Pagination First page « First Previous page ‹‹ … Page 2 Current page 3 Page 4 … Next page ›› Last page Last » Key Links Curriculum Vitae Google Scholar ORCID Organizations Physical Sciences Directorate User Facilities Center for Nanophase Materials Sciences Nanomaterials Synthesis Section Functional Hybrid Nanomaterials Group