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Communication: Chemisorption of muonium on gold nanoparticles: A sensitive new probe of surface magnetism and reactivity

Journal Article


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Abstract


  • Chemisorption of muonium onto the surface of gold nanoparticles has been observed. Muonium (u+e-), a light hydrogen-like atom, reacts chemically with uncapped 7 nm gold nanoparticles embedded in mesoporous silica (SBA-15) with a strong temperature-dependent rate. The addition rate is fast enough to allow coherent spin transfer into a diamagnetic muon state on the nanoparticle surface. The muon is well established as a sensitive probe of static or slowly fluctuating magnetic fields in bulk matter. These results represent the first muon spin rotation signal on a nanoparticle surface or any metallic surface. Only weak magnetic effects are seen on the surface of these Au nanoparticles consistent with Pauli paramagnetism.

UOW Authors


  •   Dehn, M (external author)
  •   Arseneau, D J. (external author)
  •   Boni, P (external author)
  •   Bridges, M D. (external author)
  •   Buck, T (external author)
  •   Cortie, David
  •   Fleming, D G. (external author)
  •   Kelly, J A. (external author)
  •   Macfarlane, W A. (external author)
  •   MacLachlan, M J. (external author)
  •   Mcfadden, R M. L. (external author)
  •   Morris, G D. (external author)
  •   Wang, P-X (external author)
  •   Xiao, J (external author)
  •   Zamarion, V M. (external author)
  •   Kiefl, R F. (external author)

Publication Date


  • 2016

Citation


  • Dehn, M. H., Arseneau, D. J., Boni, P., Bridges, M. D., Buck, T., Cortie, D. L., Fleming, D. G., Kelly, J. A., MacFarlane, W. A., MacLachlan, M. J., McFadden, R. M. L., Morris, G. D., Wang, P., Xiao, J., Zamarion, V. M. & Kiefl, R. F. (2016). Communication: Chemisorption of muonium on gold nanoparticles: A sensitive new probe of surface magnetism and reactivity. Journal of Chemical Physics, 145 (18), 181102-1-181102-5.

Scopus Eid


  • 2-s2.0-84995495850

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3321&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2299

Start Page


  • 181102-1

End Page


  • 181102-5

Volume


  • 145

Issue


  • 18

Abstract


  • Chemisorption of muonium onto the surface of gold nanoparticles has been observed. Muonium (u+e-), a light hydrogen-like atom, reacts chemically with uncapped 7 nm gold nanoparticles embedded in mesoporous silica (SBA-15) with a strong temperature-dependent rate. The addition rate is fast enough to allow coherent spin transfer into a diamagnetic muon state on the nanoparticle surface. The muon is well established as a sensitive probe of static or slowly fluctuating magnetic fields in bulk matter. These results represent the first muon spin rotation signal on a nanoparticle surface or any metallic surface. Only weak magnetic effects are seen on the surface of these Au nanoparticles consistent with Pauli paramagnetism.

UOW Authors


  •   Dehn, M (external author)
  •   Arseneau, D J. (external author)
  •   Boni, P (external author)
  •   Bridges, M D. (external author)
  •   Buck, T (external author)
  •   Cortie, David
  •   Fleming, D G. (external author)
  •   Kelly, J A. (external author)
  •   Macfarlane, W A. (external author)
  •   MacLachlan, M J. (external author)
  •   Mcfadden, R M. L. (external author)
  •   Morris, G D. (external author)
  •   Wang, P-X (external author)
  •   Xiao, J (external author)
  •   Zamarion, V M. (external author)
  •   Kiefl, R F. (external author)

Publication Date


  • 2016

Citation


  • Dehn, M. H., Arseneau, D. J., Boni, P., Bridges, M. D., Buck, T., Cortie, D. L., Fleming, D. G., Kelly, J. A., MacFarlane, W. A., MacLachlan, M. J., McFadden, R. M. L., Morris, G. D., Wang, P., Xiao, J., Zamarion, V. M. & Kiefl, R. F. (2016). Communication: Chemisorption of muonium on gold nanoparticles: A sensitive new probe of surface magnetism and reactivity. Journal of Chemical Physics, 145 (18), 181102-1-181102-5.

Scopus Eid


  • 2-s2.0-84995495850

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3321&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2299

Start Page


  • 181102-1

End Page


  • 181102-5

Volume


  • 145

Issue


  • 18