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Instruments / Technical Area	Publication Details	Published	Actions
I19-Small Molecule Single Crystal Diffraction	An [FeIII30] molecular metal oxide Alice E. Dearle , Daniel J. Cutler , Marco Coletta , Edward Lee , Sourav Dey , Sergio Sanz , Hector W. L. Fraser , Gary Nichol , Gopalan Rajaraman , Jürgen Schnack , Leroy Cronin , Euan K. Brechin Chemical Communications 58, 52-55 DOI: 10.1039/D1CC06224G Diamond Proposal Number(s): [22240] Open Access Show Abstract ▼ Abstract: Dissolution of FeBr3 in a mixture of acetonitrile and 3,4-lutidine in the presence of an amine results in the formation of an [Fe30] molecular metal oxide containing alternating layers of tetrahedral and octahedral FeIII ions. Mass spectrometry suggests the cluster is formed quickly and remains stable in solution, while magnetic measurements and DFT calculations reveal competing antiferromagnetic exchange interactions.	Nov 2021
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS	Understanding metal organic chemical vapour deposition of monolayer WS2 : the enhancing role of Au substrate for simple organosulfur precursors Ye Fan , Kenichi Nakanishi , Vlad P. Veigang-Radulescu , Ryo Mizuta , J. Callum Stewart , Jack E. N. Swallow , Alice E. Dearle , Oliver J. Burton , Jack A. Alexander-Webber , Pilar Ferrer , Georg Held , Barry Brennan , Andrew J. Pollard , Robert S Weatherup , Stephan Hofmann Nanoscale 7 DOI: 10.1039/D0NR06459A Diamond Proposal Number(s): [22123] Open Access Show Abstract ▼ Abstract: We find that the use of Au substrate allows fast, self-limited WS2 monolayer growth using a simple sequential exposure pattern of low cost, low toxicity precursors, namely tungsten hexacarbonyl and dimethylsulfide (DMS). We use this model reaction system to fingerprint the technologically important metal organic chemical vapour deposition process by operando X-ray photoelectron spectroscopy (XPS) to address the current lack of understanding of the underlying fundamental growth mechanisms for WS2 and related transition metal dichalcogenides. Au effectively promotes the sulfidation of W with simple organosulfides, enabling WS2 growth with low DMS pressure (<1 mbar) and a suppression of carbon contamination of as-grown WS2, which to date has been a major challenge with this precursor chemistry. Full WS2 coverage can be achieved by one exposure cycle of 10 minutes at 700 °C. We discuss our findings in the wider context of previous literature on heterogeneous catalysis, 2D crystal growth, and overlapping process technologies such as atomic layer deposition (ALD) and direct metal conversion, linking to future integrated manufacturing processes for transition metal dichalcogenide layers.	Oct 2020

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I19-Small Molecule Single Crystal Diffraction

An [FeIII30] molecular metal oxide