Cairo University

MTPR Journal

 

SURFACE NANOENGINEERING: WRITING WITH OXYGEN ADATOMS on THE oO2/MO(110)SURFACE

2016-12-17
S.Bozhko1,2, K.Walshe1, B.Walls1, O.Lübben1, B.Murphy1, V.Bozhko3, I.Shvets1
1 CRANN, School of Physics, Trinity College Dublin, Ireland
2 ISSP RAS,Chernogolovka, Russia
3MEPhI, Moscow, Russia

Vol./Issue: 16 , id: 184

Writing at the nanoscale using the desorption of oxygen adatoms from the oxygen-rich MoO2+x/Mo(110) surface is demonstrated by scanning tunneling microscopy (STM). High-temperature oxidation of the Mo(110) surface results in a strained, bulk-like MoO2(010) ultra-thin film with an O–Mo–O trilayer structure.Due to the lattice mismatch between the Mo(110) and the MoO2(010), the latter consists of well-ordered molybdenum oxide nanorows separated by 2.5 nm. Further oxidation results in the oxygen-rich MoO2+x/Mo(110)surface, which exhibits perfectly aligned double rows of oxygen adatoms,imaged by STM as bright protrusions. Individual oxygen adatoms can be removed from the surface by pulsing at positive sample biases greater than 1.5V (Fig. a,b.c). Adatoms were removed from the surface both when STM tip was in tunneling contact and when it was far from the surface (tunneling current was absent). Tipmovement along the surface can be used for controlled lithography (or writing) at the nanoscale, with a just atomic sizeofa feature (Fig. d). By moving the STMtip in a predetermined fashion, information can be written and read by applying specific biases between the surface and the tip.