Writing with atoms: Oxygen adatoms on the MoO2/Mo(110) surface

Krasnikov, Sergey A.; Lübben, Olaf; Murphy, Barry E.; Bozhko, S. I.; Чайка, А. Н.; Sergeeva, Natalia N.; Bulfin, Brendan; Shvets, I. V.

doi:10.1007/s12274-013-0370-2

Cited by 11 publications

(24 citation statements)

References 40 publications

(35 reference statements)

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“…The STM can induce molecular manipulation via local injection of electrons directly into single atoms and molecules. This manipulation may induce weakening (diffusion, switching) or breaking (desorption, dissociation, and transformation) of bonds, probing the chemistry and energetics of the surface [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface

2020

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Understanding the atomistic formation of oxide layers on semiconductors is important for thin film fabrication, scaling down conventional devices and for the integration of emerging research materials. Here, the initial oxidation of Si(111) is studied using the scanning tunneling microscope. Prior to the complete saturation of the silicon surface with oxygen, we are able to probe the atomic nature of the oxide layer formation. We establish the threshold for local manipulation of inserted oxygen sites to be +3.8 V. Only by combining imaging with local atomic manipulation are we able to determine whether inserted oxygen exists beneath surfacebonded oxygen sites and differentiate between sites that have one and more than one oxygen atom inserted beneath the surface. Prior to the creation of the thin oxide film we observe a flip in the manipulation rates of inserted oxygen sites consistent with more oxygen inserting beneath the silicon surface.

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Section: Introductionmentioning

confidence: 99%

Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface

2020

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“…For example, it has been demonstrated that a molecule-terminated STM tip yields high-resolution molecular-orbital imaging because of the p-orbital character of the tip apex, which is far superior to images achieved with a bare metal tip [1,2]. Atomic-resolution imaging is of utmost importance for the manipulation and investigation of surface point defects and adatoms as well as for the determination of the atomic structures of molecules and nanoparticles [3][4][5][6].Ultrathin insulating films grown on conductive substrates effectively reduce the electronic coupling between deposited nanoparticles and their metallic support and are therefore ideally suited for localprobe-based investigations. The intrinsic electronic properties of atoms [7], molecules [8,9], and clusters [10], as well as the charge [11,12] and spin [13][14][15] manipulations of single atoms have been investigated Nano Research…”

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confidence: 99%

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confidence: 99%

Chemically modified STM tips for atomic-resolution imaging of ultrathin NaCl films

Schouteden

Iancu

et al. 2015

Nano Res.

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Cl-functionalized scanning tunneling microscopy (STM) tips are fabricated by modifying a tungsten STM tip in situ on islands of ultrathin NaCl(100) films on Au(111) surfaces. The functionalized tips are used to achieve clear atomicresolution imaging of NaCl(100) islands. In comparison with bare metal tips, the chemically modified tips yield drastically enhanced spatial resolution as well as contrast reversal in STM topographs, implying that Na atoms, rather than Cl atoms, are imaged as protrusions. STM simulations based on a Green's function formalism reveal that the experimentally observed contrast reversal in the STM topographs is due to the highly localized character of the Cl-p z states at the tip apex. An additional remarkable characteristic of the modified tips is that in dI/dV maps, a Na atom appears as a ring with a diameter that depends crucially on the tip-sample distance.The chemical termination of the tip apex in scanning tunneling microscopy (STM) experiments determines the interaction between the wave functions of the tip and those of the sample and hence the achievable resolution in STM images. For example, it has been demonstrated that a molecule-terminated STM tip yields high-resolution molecular-orbital imaging because of the p-orbital character of the tip apex, which is far superior to images achieved with a bare metal tip [1,2]. Atomic-resolution imaging is of utmost importance for the manipulation and investigation of surface point defects and adatoms as well as for the determination of the atomic structures of molecules and nanoparticles [3][4][5][6].Ultrathin insulating films grown on conductive substrates effectively reduce the electronic coupling between deposited nanoparticles and their metallic support and are therefore ideally suited for localprobe-based investigations. The intrinsic electronic properties of atoms [7], molecules [8,9], and clusters [10], as well as the charge [11,12] and spin [13][14][15] manipulations of single atoms have been investigated Nano Research

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“…An STM image of this oxygen-rich surface, which is denoted as MoO 2+x /Mo(110) [29], is presented in figure 5. The oxygen adatoms are adsorbed on top of the Mo oxide nanorows [29], forming a perfectly aligned double row structure.…”

Section: Growth Of Fe On the Moo 2+x Surfacementioning

confidence: 99%

Nanoclusters and nanolines: the effect of molybdenum oxide substrate stoichiometry on iron self-assembly

et al. 2017

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Abstract. The growth of Fe nanostructures on the stoichiometric MoO 2 /Mo(110) and oxygen-rich MoO 2+x /Mo(110) surfaces has been studied using lowtemperature scanning tunneling microscopy (STM) and density functional theory calculations. STM results indicate that at low coverage Fe nucleates on the MoO 2 /Mo(110) surface, forming small, well-ordered nanoclusters of uniform size, each consisting of 5 Fe atoms. These 5-atom clusters can agglomerate into larger nanostructures reflecting the substrate geometry but retain their individual character within the structure. Linear Fe nanocluster arrays are formed on the MoO 2 /Mo(110) surface at room temperature when the surface coverage is greater than 0.6 monolayers. These nanocluster arrays follow the direction of the oxide rows of the strained MoO 2 /Mo(110) surface. Slightly altering the preparation procedure of MoO 2 /Mo(110) leads to the presence of oxygen adatoms on this surface. Fe deposition onto the oxygen-rich MoO 2+x /Mo(110) surface results in elongated nanostructures that reach up to 24 nm in length. These nanolines have a zigzag shape and are likely composed of partially oxidized Fe formed upon reaction with the oxygen-rich surface.

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Writing with atoms: Oxygen adatoms on the MoO2/Mo(110) surface

Cited by 11 publications

References 40 publications

Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface

Combining scanning tunneling microscope (STM) imaging and local manipulation to probe the high dose oxidation structure of the Si(111)-7×7 surface

Chemically modified STM tips for atomic-resolution imaging of ultrathin NaCl films

Nanoclusters and nanolines: the effect of molybdenum oxide substrate stoichiometry on iron self-assembly

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