Self-Assembled Monolayers on Oxidized Metals. 2. Gold Surface Oxidative Pretreatment, Monolayer Properties, and Depression Formation

Ron, Hannoch; Matlis, and Sophie; Rubinstein, Israel

doi:10.1021/la970785v

Cited by 243 publications

(264 citation statements)

References 28 publications

(40 reference statements)

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“…As discussed in the main paper, we expect that the contamination of the Au surface on the MEMS device with spurious carbon-and oxygen-containing molecules, such as carbon monoxide 3,12 . The discussed evidence for such a molecule can be the formation of a conductance peak below 1 G0, and a shift or shoulder of the peak at 1 G0 as observed elsewhere 13 .…”

Section: Conductance Peak Shiftmentioning

confidence: 94%

“…The development of experimental techniques, such as scanning tunneling microscopy (STM) and mechanically controlled break junction (MCBJ) enabled the formation and manipulation of monoatomic metallic chains 3,4,5 . Using these techniques, charge transport in atomic junctions has been studied intensively 2,3,4,5 , and, more recently, Joule dissipation 9,10 and thermoelectric effects 11,12 have been successfully probed. Recently, heat dissipation was measured in current-carrying single gold-gold contacts by means of STM with an integrated micro thermocouple in the tip 9 .…”

Section: Introductionmentioning

confidence: 99%

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Heat transport through atomic contacts

et al. 2017

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Metallic atomic junctions pose the ultimate limit to the scaling of electrical contacts 1 . They serve as model systems to probe electrical and thermal transport down to the atomic level as well as quantum effects occurring in one-dimensional systems 2 . Charge transport in atomic junctions has been studied intensively in the last two decades 2,3,4,5 . However, heat transport remains poorly characterized because of significant experimental challenges. Specifically the combination of high sensitivity to small heat fluxes and the formation of stable atomic contacts has been a major hurdle for the development of this field. Here we report on the realization of heat transfer measurements through atomic junctions and analyze the thermal conductance of single atomic gold contacts at room temperature. Simultaneous measurements of charge and heat transport reveal the proportionality of electrical and thermal conductance, quantized with the respective conductance quanta 6 . This constitutes an atomic scale verification of the well-known Wiedemann-Franz law 7 . We anticipate that our findings will be a major advance in enabling the investigation of heat transport properties in molecular junctions, with meaningful implications towards the manipulation of heat at the nanoscale. IntroductionHeat transport and dissipation at the nanoscale has spurred research interest as it severely limits scaling of high performance electronic devices and circuits 8 . Atomic quantum point contacts represent an ideal platform to investigating heat transport in which quantum confinement effects cannot be neglected. The development of experimental techniques, such as scanning tunneling microscopy (STM) and mechanically controlled break junction (MCBJ) enabled the formation and manipulation of monoatomic metallic chains 3,4,5 . Using these techniques, charge transport in atomic junctions has been studied intensively 2,3,4,5 , and, more recently, Joule dissipation 9,10 and thermoelectric effects 11,12 have been successfully probed. Recently, heat dissipation was measured in current-carrying single gold-gold contacts by means of STM with an integrated micro thermocouple in the tip 9 . It was shown that heat dissipates symmetrically into the two contacts, confirming that the electron transmission function T(E) of the junction element around the Fermi energy of the metallic contacts governs this phenomenon. Despite these recent steps forward, the properties of heat conduction through atomic junctions still remain to be fully explored.Electrical conductance in atomic junctions is quantized. A single gold atom contact has a conductance equal to the quantum G0 = 2e 2 /h, where e is the electron charge and h Planck's constant. The Landauer approach used to describe charge transport can also be applied to predict heat transport 13 and predicts the validity of the Wiedemann-Franz (WF) law, which states that the thermal conductance GTH and the electrical conductance GEL are proportional to each other,where T is the absolute temperature and the proportio...

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Section: Conductance Peak Shiftmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Heat transport through atomic contacts

et al. 2017

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“…A VIA shadow mask was microscopically aligned to the Al gate lines and 60 nm of Au was thermally deposited to pattern the VIAs. The sample (with both gate and VIAs) was then exposed to an oxygen plasma to selectively increase the thickness of the native Al 2 O 3 atop the Al lines, which only grows an unstable oxide atop Au 28,29 . ALD Al 2 O 3 then selectively deposits a high-quality oxide atop the Al, but not atop the Au, which still retains conductivity after ALD, as experimentally verified.…”

Section: Flexiblementioning

confidence: 99%

Flexible and low-voltage integrated circuits constructed from high-performance nanocrystal transistors

et al. 2012

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Colloidal semiconductor nanocrystals are emerging as a new class of solution-processable materials for low-cost, flexible, thin-film electronics. Although these colloidal inks have been shown to form single, thin-film field-effect transistors with impressive characteristics, the use of multiple high-performance nanocrystal field-effect transistors in large-area integrated circuits has not been shown. This is needed to understand and demonstrate the applicability of these discrete nanocrystal field-effect transistors for advanced electronic technologies. Here we report solution-deposited nanocrystal integrated circuits, showing nanocrystal integrated circuit inverters, amplifiers and ring oscillators, constructed from highperformance, low-voltage, low-hysteresis CdSe nanocrystal field-effect transistors with electron mobilities of up to 22 cm 2 V À 1 s À 1 , current modulation 410 6 and subthreshold swing of 0.28 Vdec À 1 . We fabricated the nanocrystal field-effect transistors and nanocrystal integrated circuits from colloidal inks on flexible plastic substrates and scaled the devices to operate at low voltages. We demonstrate that colloidal nanocrystal field-effect transistors can be used as building blocks to construct complex integrated circuits, promising a viable material for low-cost, flexible, large-area electronics.

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“…This is expected to reduce possible gold oxide on the surface and increase the reproducibility of self-assembly processes. 13,14 The as-fabricated devices are then immersed in a 0.1-1 mM solution of the molecules of interest. The immersion time depends on the anchoring groups of the molecule and may range from a few minutes for dithiols to 24 h for dihioacetates for which we employ no deprotection agents.…”

Section: Experimental Protocol For Single-molecule Measurementsmentioning

confidence: 99%

A versatile low-temperature setup for the electrical characterization of single-molecule junctions

Martin

Smit

Egmond

et al. 2011

Review of Scientific Instruments

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We present a modular high-vacuum setup for the electrical characterization of single molecules down to liquid helium temperatures. The experimental design is based on microfabricated mechanically controllable break junctions, which offer control over the distance of two electrodes via the bending of a flexible substrate. The actuator part of the setup is divided into two stages. The slow stage is based on a differential screw drive with a large bending range. An amplified piezoceramic actuator forms the fast stage of the setup, which can operate at bending speeds of up to 800 μm/s. In our microfabricated break junctions this is translated into breaking speeds of several 10 nm/s, sufficient for the fast acquisition of large statistical datasets. The bandwidth of the measurement electronics has been optimized to enable fast dI/dV spectroscopy on molecular junctions with resistances up to 100 M . The performance of the setup is demonstrated for a π -conjugated oligo(phenyleneethynylene)-dithiol molecule.

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Self-Assembled Monolayers on Oxidized Metals. 2. Gold Surface Oxidative Pretreatment, Monolayer Properties, and Depression Formation

Cited by 243 publications

References 28 publications

Heat transport through atomic contacts

Heat transport through atomic contacts

Flexible and low-voltage integrated circuits constructed from high-performance nanocrystal transistors

A versatile low-temperature setup for the electrical characterization of single-molecule junctions

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