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Step-flow growth of graphene-boron nitride lateral heterostructures by molecular beam epitaxy
No full textIntegration of graphene and hexagonal boron nitride (hBN) into lateral heterostructures has drawn focus due to the ability to broadly engineer the material properties. Hybrid monolayers with tuneable bandgaps have been reported, while the interface itself possesses unique electronic and magnetic qualities. Herein, we demonstrate lateral heteroepitaxial growth of graphene and hBN by sequential growth using high-temperature molecular beam epitaxy (MBE) on highly ordered pyrolytic graphite (HOPG). We find, using scanning probe microscopy, that graphene growth nucleates at hBN step edges and grows across the surface to form nanoribbons with a controlled width that is highly uniform across the surface. The graphene nanoribbons grow conformally from the armchair edges of hexagonal hBN islands forming multiply connected regions with the growth front alternating from armchair to zigzag in regions nucleated close to the vertices of hexagonal hBN islands. Images with lattice resolution confirm a lateral epitaxial alignment between the hBN and graphene nanoribbons, while the presence of a moiré pattern within the ribbons indicates that some strain relief occurs at the lateral heterojunction. These results demonstrate that high temperature MBE is a viable route towards integrating graphene and hBN in lateral heterostructures
In situ protein identification, mapping and depth profiling using 3D OrbiSIMS
No full textLabel-free protein characterisation at surfaces requires digestion or matrix application prior to mass spectrometry. We report the assignment of undigested proteins at surfaces using secondary ion mass spectrometry (SIMS). Ballistic fragmentation induced by a gas cluster ion beam (GCIB) produces peptide fragments for subsequent OrbitrapTM analysis. We annotate 16 example proteins (up to 272 kDa) by de novo sequencing and apply the methodology to characterising a protein monolayer biochip and in situ depth profiling of proteins through human skin
Visual Impairments Reflective Design Cards
Get PDFThe illustrations in the cards are adapted from royalty and attribution free sources on Pixabay, a free image repository.A deck of reflective design cards representing different layers of visually impaired experiences for prompting consideration of visual impairments in systems design. It consists of five card categories: competencies, tools, activities, relations, and locations
Data for: Lipase mediated enzymatic kinetic resolution of phenylethyl halohydrins acetates: A case of study and rationalization
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Resource allocation decision-making in dementia care with and without budget constraints: a qualitative analysis
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