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Direct evidence of the dependence of surface state density on the size of SnO2 nanoparticles observed by scanning tunnelling spectroscopy |
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| Authors: | T G G Maffeïs G T Owen C Malag G Martinelli M K Kennedy F E Kruis S P Wilks |
| Institution: | a Multidisciplinary Nanotechnology Centre, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK b Department of Physics, Ferrara University and INFM, 12 via Paradiso, 44100, Ferrara, Italy c Process and Aerosol Measurement Technology, University Duisburg-Essen, Bismarckstr. 81, 47057, Duisburg, Germany |
| Abstract: | In this work, we report a scanning tunnelling spectroscopy (STS) study of 30 and 10 nm tin dioxide nanoparticles. The STS spectra give a surface band gap of 2.5 eV for both samples and show that the density of surface states in the band gap is around 6 times higher for the 30 nm particles than for the 10 nm particles. This provides direct experimental evidence for our theoretical model, which predicts a decrease in the surface state density as the particle size decreases, and partly accounts for the improved sensitivity of gas sensing devices fabricated with nanoparticles. |
| Keywords: | Tin oxides Computer simulations Polycrystalline surfaces Scanning tunneling microscopy Scanning tunneling spectroscopies Surface electronic phenomena (work function surface potential surface states etc ) |
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