Synthesis and Characterisation Characterisation Synthesis and of - - PowerPoint PPT Presentation

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Synthesis and Characterisation Characterisation Synthesis and of - - PowerPoint PPT Presentation

Feb 25, 2023 540 likes •728 views

Synthesis and Characterisation Characterisation Synthesis and of ZnO-WS 2 Nanowires, of ZnO-WS 2 Nanowires, a Model Material for Nanotribology Nanotribology and Manipulation and Manipulation a Model Material for a , Boris a , b , Jelena

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SLIDE 1

Synthesis and Synthesis and Characterisation Characterisation

  • f ZnO-WS
  • f ZnO-WS2

2 Nanowires,

Nanowires,

a Model Material for a Model Material for Nanotribology Nanotribology and Manipulation and Manipulation

Jelena Jelena Butikova Butikovaa

a, Boris

, Boris Polyakov Polyakova

a,

, Sergei Sergei Vlassov Vlassovb

b,

, Edgars Edgars Butanovs Butanovsa

a,

, Mikk Mikk Antsov Antsovb

b,

,

Sven

Sven Oras Orasb

b

aInstitute of Solid State Physics, University of Latvia bInstitute of Physics, University of Tartu

TiN17, Trieste

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SLIDE 2

Outline

  • Synthesis of ZnO-WS2 core-shell nanowires
  • Characterisation of ZnO-WS2 core-shell nanowires
  • Tribological experiments on ZnO-WS2 nanowires
  • Future plans

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SLIDE 3

Why core-shell nanowires?

  • New advanced properties
  • Mechanical
  • Electrical
  • Optical
  • Functional properties & applications
  • Radial p-n junction diode
  • Electroluminiscence
  • Photocatalysis and water splitting

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SLIDE 4

ZnO-WS2 nanowires

2D WS2 ZnO NWs ZnO-WS2

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SLIDE 5

Synthesis

ZnO nanowire growth (chemical vapour transport; Au catalyst) a-WO 3 layer deposition by DC magnetron: reactive sputtering in O2/Ar atmosphere Annealing in sulphur atmosfere

Three-step process:

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SLIDE 6

SEM characterisation

ZnO / a-WO3

ZnO-WS2 NWs

ZnO nanowires

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SLIDE 7

Raman spectroscopy

Raman spectrum of WS2 2D nanoplates Raman spectrum of ZnO-WS2 nanowires

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SLIDE 8

Photoluminescence

PL spectrum of WS2 2D nanoplates PL spectrum of ZnO and ZnO-WS2 nanowires

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SLIDE 9

TEM morphology

(a, b) ZnO nanowire with a-WO3 layer (c, d, e, f) ZnO-WS2 nanowires

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TEM diffraction

(c, e) WS2 layer tungstenite structure, <1213> zone axis (d, f) Hexagonal ZnO-zincite structure, <1120> zone axis

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SLIDE 11

Polyakov et al (2016) J. Phys. Chem. C 120: 21451–21459

Core-shell nanowires

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SLIDE 12

AFM measurements

Young modulus is size-dependent

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SLIDE 13

ZnO-WS2 nanowires

Measurement of kinetic friction (rotation) of ZnO-WS2 in SEM skin = 0.5 MPa

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SLIDE 14

ZnO-WS2 nanowires

Measurement of static friction of ZnO-WS2 in SEM

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SLIDE 15

Synthesis Synthesis

  • f
  • f

Core-shell Core-shell Nanoparticles Nanoparticles and and Nanowires Nanowires with with 2D 2D Transition Transition Metal Metal Disulfides Disulfides Shell Shell

For more information

  • n nanomanipulations ,

please visit our poster

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SLIDE 16

Future plans:

  • Synthesis of core-shell Me-MeS2 nanoparticles using

laser ablation in liquid

  • Nanotribology experiments: manipulations with Me-

MeS2 nanoparticles in SEM

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SLIDE 17

Our team

Boris Polyakov Sergei Vlassov Edgars Butanovs Mikk Antsov Sven Oras

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SLIDE 18

Thanks a lot for your attention!

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