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patterning Functionalized Surfaces of 2D Materials by Nanoshaving

Nanomanufacturing and Metrology 2022年第1期5卷 23-31页

作者： Katie O'Neill Rob Greig Rita Tilmann Lisanne peters conor p.cullen Graeme Cunningham Cian Bartlam Cormac O Coileain Niall McEvoy Georg S.Duesberg School of physics Trinity College DublinDublin 2 D02 PN40Ireland AMBER Centre CRANN InstituteTrinity College DublinDublin 2Ireland Institute of physics EIT 2Faculty of Electrical Engineering and Information TechnologyUniversitat der Bundeswehr Miinchen85579 NeubibergGermany School of Chemistry Trinity College DublinDublin 2Ireland

Atomic force microscopy(AFM)and scanning probe lithography can be used for the mechanical treatment of various surfaces,including polymers,metals,and *** technique of nanoshaving,in which materials are removed using the AFM tip,is employed in this work to produce nanopatterns of self-assembled monolayers(SAMs)on two-dimensional(2D)*** materials used are monolayers of transition metal dichalcogenides(TMDs),namely,MoS_(2)and WS_(2),which are noncovalently functionalized with perylene diimide(pDI),a perylene *** approach involves rastering an AFM probe across the surface at a controlled increased load in ambient *** a result of the strong bond between pDI SAM and TMD,loads in excess of 1|1N are required to pattern the *** predefined patterns,including a grating pattern with feature sizes below 250 nm,are *** indicate the high precision of nanoshaving as an accurate and nondestructive lithographic technique for 2D *** work functions of shaved heterostructures are also examined using Kelvin probe force microscopy.

关键词： Nanoshaving AFM KpFM perylene diimide 2D materials MoS_(2) WS_(2) Noncovalent functionalization

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Synthesis of tungsten ditelluride thin films and highly crystalline nanobelts from pre-deposited reactants

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Tungsten 2020年第3期2卷 321-334页

作者： John B.Mc Manus Cansu Ilhan Bastien Balsamo Clive Downing conor p.cullen Tanja Stimpel‑Lindner Graeme Cunningham Lisanne peters Lewys Jones Daragh Mullarkey Igor V.Shvets Georg S.Duesberg Niall McEvoy School of Chemistry Trinity College DublinDublin 2 D02 PN40Ireland AMBER Centre CRANN InstituteTrinity College DublinDublin 2 D02 PN40Ireland SIGMA Clermont UniversitéClermont Auvergne63000 Clermont–FerrandFrance Institute of physics EIT 2Faculty of Electrical Engineering and Information TechnologyUniversität der Bundeswehr München85579 NeubibergGermany School of physics Trinity College DublinDublin 2 D02 PN40Ireland

Tungsten ditelluride(WTe_(2))is a layered transition metal dichalcogenide(TMD)that has attracted increasing research inter-est in recent ***_(2) has demonstrated large non-saturating magnetoresistance,potential for spintronic applications and promise as a type-II Weyl *** majority of works on WTe_(2) have relied on mechanically exfoliated flakes from chemical vapour transport(CVT)-grown crystals for their *** producing high-quality samples,this method is hindered by several disadvantages including long synthesis time,high-temperature annealing and an inherent lack of *** this work,a synthesis method is demonstrated that allows the production of large-area polycrystalline films of WTe_(2).This is achieved by the reaction of pre-deposited films of W and Te at a relatively low temperature of 550℃.Sputter X-ray photoelectron spectroscopy reveals the rapid but self-limiting nature of the oxidation of these WTe_(2) films in ambient *** WTe_(2) films are composed of areas of micrometre-sized nanobelts that can be isolated and offer potential as an alternative to CVT-grown *** nanobelts are highly crystalline with low defect densities indicated by transmission electron microscopy and show promising initial electrical results.

关键词： Two-dimensional materials Tungsten ditelluride Film conversion Electrodeposition Nanoelectronics

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