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SUMMARY:IMX Seminar Series - Solutions of anionic 2D materials and phospho
 rene nanoribbons
DTSTART:20191028T131500
DTEND:20191028T141500
DTSTAMP:20260505T015332Z
UID:1df2f2217a65606c8e63ea626378e9e538052ef3d55ec30dbe07e8a0
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Chris Howard\, University College London UK\nI will focu
 s on recent work [1\, 2\, 3] in which we demonstrate that a range of ion-i
 ntercalated layered materials can spontaneously dissolve in polar solvents
  to form ionic solutions of 2D materials. The thermodynamically-driven dis
 solution is benign\, advantageously maintains the morphology of the start
 ing materials and can achieve solutions containing exclusively individuali
 sed monolayers. The charge on the anionic nanosheet solutes is reversible
 \, enables targeted deposition over large areas via electroplating and can
  initiate novel self-assembly upon drying [1].\nSurprisingly\, applying th
 is method to crystals of black phosphorus results in nanoribbons rather th
 an 2D nanosheets [2]. Despite the motivation of over 100 publications pred
 icting that phosphorene nanoribbons (PNRs) would have extraordinary proper
 ties\, until our work\, no one had made PNRs\, and there was no obvious wa
 y of applying established routes for forming graphene nanoribbons to phosp
 horene. The PNRs we produce have typical widths of 4-50 nm\, predominantly
  single-layer thickness\, lengths up to 75 μm. The PNRs are atomically-fl
 at single crystals\, aligned exclusively in the zigzag crystallographic or
 ientation with remarkably uniform widths along their entire lengths\, and 
 are extremely flexible. Our work thus enables the search for predicted exo
 tic states in PNRs including spin density waves\, tunable magnetism and to
 pological states\, and testing in applications where PNRs are predicted to
  give transformative advantages\, ranging from fast-charging batteries\, t
 o flexible thermoelectric devices and nanoelectronics.\n \n\n	P. Cullen\,
  et al. Nat. Chem. 15\, 555 (2017)\,\n	T.S. Miller et al. Nano Letts. 17\,
  5891 (2017)\n	M. Watts\, et al. Nature 586\, 216 (2019)\n\nBio: Chris How
 ard is an Associate Professor at University College London where he had pr
 eviously obtained his Ph.D. His lab specialises in the manipulation of low
  dimensional materials via chemical doping that he studies both in the sol
 id state and in liquid. Following his Ph. D. he was awarded a fellowship t
 o develop his novel ideas for carbon nanotube dissolution. This work lead 
 to patents and commercialisation and eventually he worked full time workin
 g for industry during this process. He subsequently completed postdoc rese
 arch at Royal Holloway London before being appointed Lecturer in Physics b
 ack at UCL in 2013. He uses a wide range of in house experimental methods 
 and spends a lot of time at central facilities\, particularly for X-ray an
 d neutron scattering.\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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