Self-assembled Fe nanowires using organometallic chemical vapor deposition and CaF2 masks on stepped Si(111)

Lin, Ja‐Chen; Petrovykh, Dmitri Y.; Kirakosian, A.; Rauscher, H.; Himpsel, F. J.; Dowben, Peter A.

doi:10.1063/1.1345830

Cited by 64 publications

(35 citation statements)

References 14 publications

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“…23 In addition, CaF 2 / Si͑111͒ has been used to for the self-organization of atomic wires via selective adsorption of metal organic molecules at atomic steps of vicinal substrates. [24][25][26] The key properties of CaF 2 films for all applications mentioned above are the large band gap and conduction-band offsets, respectively, as well as the high quality of ultrathin CaF 2 films deposited on Si͑111͒. The latter point strongly depends on the lattice matching between CaF 2 ͑111͒ and Si͑111͒.…”

Section: Introductionmentioning

confidence: 99%

Structural transitions and relaxation processes during the epitaxial growth of ultrathinCaF2films on Si(111)

et al. 2010

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The structure and morphology of ultrathin lattice matched CaF 2 films of very few monolayers thickness, which were deposited on Si͑111͒ substrates by molecular-beam epitaxy, have been studied in situ by synchrotron based grazing incidence x-ray diffraction. Even for the thinnest investigated film of three monolayers thickness, the in-plane structure of the CaF 2 film is determined by a lateral separation in two domains: a pseudomorphic phase assuming the lateral lattice constant of the Si͑111͒ substrate and a completely relaxed phase. Analysis of the crystal truncation rods verifies that both phases adopt the entire homogeneous CaF 2 film thickness. Therefore, we propose that atomic steps of the substrate bypass the nucleation barrier for the formation of ͑Shockley partial͒ dislocations so that the film starts to relax below the classical critical film thickness. While the relaxed phase assumes also the CaF 2 bulk lattice constant for the vertical direction, the vertical lattice constant of the pseudomorphic phase increases due to the compressive lateral strain at the interface. This vertical expansion of the pseudomorphic phase, however, is larger than expected from the elastic constants of the CaF 2 bulk. The fraction of the pseudomorphic CaF 2 phase decreases with increasing film thickness. The interface between the pseudomorphic CaF 2 phase and the Si͑111͒ substrate is characterized by Ca on T 4 sites, a smaller distance between the Si͑111͒ substrate and the CaF interface layer and an expanded layer distance between CaF interface layer and the completely stoichiometric CaF 2 film.

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Section: Introductionmentioning

confidence: 99%

Structural transitions and relaxation processes during the epitaxial growth of ultrathinCaF2films on Si(111)

et al. 2010

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“…By incorporating transducers, control and measurement functions can be built into these systems (8). Innovative nanometer-scale materials and structures include quantum dots (9), nanowires (10,11), and nanotubes (12).…”

Section: Mems and Nemsmentioning

confidence: 99%

Application of Micro- and Nano-Electromechanical Devices to Drug Delivery

Staples¹,

et al. 2006

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Micro- and nano-electromechanical systems (MEMS and NEMS)-based drug delivery devices have become commercially-feasible due to converging technologies and regulatory accommodation. The FDA Office of Combination Products coordinates review of innovative medical therapies that join elements from multiple established categories: drugs, devices, and biologics. Combination products constructed using MEMS or NEMS technology offer revolutionary opportunities to address unmet medical needs related to dosing. These products have the potential to completely control drug release, meeting requirements for on-demand pulsatile or adjustable continuous administration for extended periods. MEMS or NEMS technologies, materials science, data management, and biological science have all significantly developed in recent years, providing a multidisciplinary foundation for developing integrated therapeutic systems. If small-scale biosensor and drug reservoir units are combined and implanted, a wireless integrated system can regulate drug release, receive sensor feedback, and transmit updates. For example, an "artificial pancreas" implementation of an integrated therapeutic system would improve diabetes management. The tools of microfabrication technology, information science, and systems biology are being combined to design increasingly sophisticated drug delivery systems that promise to significantly improve medical care.

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“…1,2 However, the measurement of charge transport through such nanostructures is still a challenge. To provide electrical contacts to individual nanostructures is a problem.…”

Section: Introductionmentioning

confidence: 99%

Ultra compact multitip scanning tunneling microscope with a diameter of 50 mm

Cherepanov¹,

Zubkov²,

Junker³

et al. 2012

Review of Scientific Instruments

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We present a multitip scanning tunneling microscope (STM) where four independent STM units are integrated on a diameter of 50 mm. The coarse positioning of the tips is done under the control of an optical microscope or scanning electron microscopy in vacuum. The heart of this STM is a new type of piezoelectric coarse approach called KoalaDrive. The compactness of the KoalaDrive allows building a four-tip STM as small as a single-tip STM with a drift of less than 0.2 nm/min at room temperature and lowest resonance frequencies of 2.5 kHz (xy) and 5.5 kHz (z). We present as examples of the performance of the multitip STM four point measurements of silicide nanowires and graphene.

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Self-assembled Fe nanowires using organometallic chemical vapor deposition and CaF2 masks on stepped Si(111)

Abstract: Kirakosian, A.; Rauscher, H.; Himpsel, F.J.; and Dowben, Peter A., "Self-assembled Fe nanowires using organometallic chemical vapor deposition and CaF 2 masks on stepped Si(111)" (2001). Peter Dowben Publications. 96.

Cited by 64 publications

References 14 publications

Structural transitions and relaxation processes during the epitaxial growth of ultrathinCaF2films on Si(111)

Structural transitions and relaxation processes during the epitaxial growth of ultrathinCaF2films on Si(111)

Application of Micro- and Nano-Electromechanical Devices to Drug Delivery

Ultra compact multitip scanning tunneling microscope with a diameter of 50 mm

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