Surface Structure of Aerobically Oxidized Diamond Nanocrystals
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- 作者：Abraham Wolcott ; Theanne Schiros ; Matthew E. Trusheim ; Edward H. Chen ; Dennis Nordlund ; Rosa E. Diaz ; Ophir Gaathon ; Dirk Englund ; Jonathan S. Owen
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：November 20, 2014
- 年：2014
- 卷：118
- 期：46
- 页码：26695-26702
- 全文大小：390K
- ISSN：1932-7455
文摘
We investigate the aerobic oxidation of high-pressure, high-temperature nanodiamonds (5鈥?0 nm dimensions) using a combination of carbon and oxygen K-edge X-ray absorption, wavelength-dependent X-ray photoelectron, and vibrational spectroscopies. Oxidation at 575 掳C for 2 h eliminates graphitic carbon contamination (>98%) and produces nanocrystals with hydroxyl functionalized surfaces as well as a minor component (<5%) of carboxylic anhydrides. The low graphitic carbon content and the high crystallinity of HPHT are evident from Raman spectra acquired using visible wavelength excitation (位excit = 633 nm) as well as carbon K-edge X-ray absorption spectra where the signature of a core鈥揾ole exciton is observed. Both spectroscopic features are similar to those of chemical vapor deposited (CVD) diamond but differ significantly from the spectra of detonation nanodiamond. The importance of these findings to the functionalization of nanodiamond surfaces for biological labeling applications is discussed.