Chemical vapor deposition allows the preparation of few-layer films of MoTe in three distinct structural phases depending on the growth quench temperature: 2H, 1T', and 1T. We present experimental and computed Raman spectra for each of the phases and utilize transport measurements to explore the properties of the 1T MoTe phase. Density functional theory modeling predicts a (semi-)metallic character. Our experimental 1T films affirm the former, show facile μA-scale source-drain currents, and increase in conductivity with temperature, different from the 1T' phase. Variation of the growth method allows the formation of hybrid films of mixed phases that exhibit susceptibility to gating and significantly increased conductivity.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acsnano.6b07499 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Manipulation of Surface Spin Configurations for Enhanced Performance in Oxygen Evolution Reactions.
Nano Lett
January 2025
Jiangxi Provincial Key Laboratory of Green Hydrogen and Advanced Catalysis, College of Physics, Communication and Electronics, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, Jiangxi, China.
studies of the relationship between surface spin configurations and spin-related electrocatalytic reactions are crucial for understanding how magnetic catalysts enhance oxygen evolution reaction (OER) performance under magnetic fields. In this work, 2D FeSe nanosheets with rich surface spin configurations are synthesized via chemical vapor deposition. magnetic force microscopy and Raman spectroscopy reveal that a 200 mT magnetic field eliminates spin-disordered domain walls, forming a spin-ordered single-domain structure, which lowers the OER energy barrier, as confirmed by theoretical calculations.
View Article and Find Full Text PDFDye-sensitized upconversion nanoprobes with ultra-high signal-to-background ratio for visual and sensitive detection of nerve agent mimics.
Mikrochim Acta
January 2025
Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
An exciting upconversion nanoprobe conditioning strategy is proposed to improve the signal-to-background ratio (SBR) through a dye-sensitized strategy, in which the dye functions both as a recognition unit of the detection target and as a sensitizer to amplify the visible luminescence of the lanthanide-doped upconversion nanoparticles (UCNPs), instead of a quencher. The application of this dye-sensitized upconversion nanoprobe to the visual detection of nerve agent mimics diethoxy phosphatidylcholine (DCP) showed excellent detection performance, with up to 110-fold enhancement of the luminescence response of the probe in DCP solution and a detection limit as low as 2 nM. Finally, we performed visual detection of DCP solution and vapor by using test strips containing the probe.
View Article and Find Full Text PDFPyrrolopyrrole Cyanine Aggregates with Amplified Superoxide Radical Generation, GSH Depletion, and Photothermal Action for Hypoxic Cancer Phototherapy.
ACS Appl Mater Interfaces
January 2025
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China.
The elevated glutathione (GSH) level and hypoxia in tumor cells are two key obstacles to realizing the high performance of phototherapy. Herein, the electron-donating rotors are introduced to wings of electron-withdrawing pyrrolopyrrole cyanine (PPCy) to form donor-acceptor-donor structure -aggregates for amplified superoxide radical generation, GSH depletion, and photothermal action for hypoxic cancer phototherapy to tackle this challenge. Three PPCy photosensitizers (PPCy-H, PPCy-Br, and PPCy-TPE) produce hydroxyl radicals (•OH) and superoxide radicals (O) in hypoxia tumors exclusively as well as excellent photothermal performances under light irradiation.
View Article and Find Full Text PDFOvercoming the Conductance versus Crossover Trade-off in State-of-the-Art Proton Exchange Fuel-Cell Membranes by Incorporating Atomically Thin Chemical Vapor Deposition Graphene.
Nano Lett
January 2025
Interdisciplinary Graduate Program in Materials Science, Vanderbilt University, Nashville, Tennessee 37235, United States.
Permeance-selectivity trade-offs are inherent to polymeric membranes. In fuel cells, thinner proton exchange membranes (PEMs) could enable higher proton conductance and increased power density with lower area-specific resistance (ASR), smaller ohmic losses, and lower ionomer cost. However, reducing thickness is accompanied by an increase in undesired species crossover harming performance and long-term efficiency.
View Article and Find Full Text PDFPreliminary mechanistic insights into the detection of ethanol vapour using MnO NRs-CNPs-poly-4-(vinylpyridine) based solid-state sensor operating at room temperature.
Heliyon
January 2025
Department of Chemical Sciences, University of Johannesburg, PO Box 17011, Doornfontein, 2028, Johannesburg, South Africa.
Semiconductor metal oxide gas sensors are widely used to detect ethanol vapours, commonly used in industrial productions, road safety detection, and solvent production; however, they operate at extremely high temperatures. In this work, we present manganese dioxide nanorods (MnO NRs) prepared via hydrothermal synthetic route, carbon soot (CNPs) prepared via pyrolysis of lighthouse candle, and poly-4-vinylpyridine (P4VP) composite for the detection of ethanol vapour at room temperature. MnO, CNPs, P4VP, and MnO NRs-CNPs-P4VP composite were characterised using scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, and Raman spectroscopy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!