Electron spectroscopy of nanodiamond surface states

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• 作者：Belobrov ; P.I. ; Bursill ; L.A. ; Maslakov ; K.I. ; Dementjev ; A.P.
• 关键词：Nanodiamond ; Surface states ; PEELS ; XPS ; Auger electron spectroscopy
• 刊名：Applied Surface Science
• 出版年：2003
• 出版时间：June 15, 2003
• 年：2003
• 卷：215
• 期：1-4
• 页码：169-177
• 全文大小：287 K

文摘

Electronic states of nanodiamond (ND) were investigated by PEELS, XPS and CKVV Auger spectra. Parallel electron energy loss spectra (PEELS) show that the electrons inside of ND particles are sp³ hybridized but there is a surface layer containing distinct hybridized states. The CKVV Auger spectra imply that the HOMO of the ND surface has a shift of 2.5eV from natural diamond levels of σ_p up to the Fermi level. Hydrogen (H) treatment of natural diamond surface produces a chemical state indistinguishable from that of ND surfaces using CKVV. The ND electronic structure forms σ_s¹σ_p²π¹ surface states without overlapping of π-levels. Surface electronic states, including surface plasmons, as well as phonon-related electronic states of the ND surface are also interesting and may also be important for field emission mechanisms from the nanostructured diamond surface.