Electron paramagnetic resonance spectroscopy of hydrogen-doped indium oxide

tubular nanostructures revealed presence of paramagnetic oxygen vacancies (VO) at

room temperature. For temperatures below 80K, the electron paramagnetic

resonance spectra exhibit two distinct split resonances correspond to S = ½

hydrogen electron spin. Interestingly, presence of hydrogen electron paramagnetic

resonance resonances was accompanied by absence of electron paramagnetic

resonance signal of VO, which was restored above 80K with the concomitant

disappearance of signature resonances from hydrogen. The temperature dependent

donor and passivation behaviour of hydrogen was directly observed in metal oxide.

This could provide valuable explanations of various VO induced controversial

properties of indium oxide nanostructures.

Investigating the Role of Hydrogen in Indium Oxide Tubular Nanostructures as a

Donor or Oxygen Vacancy Passivation Center. M.Kumar, R.Chatterjee,

S.Milikisiyants, A.Kanjilal, M.Voelskow, D.Grambole, K.V.Lakshmi, J.P.Singh:

Applied Physics Letters, 2009, 95[1], 013102