Viscoelastic and electrical properties of self-assembled monolayers on gold (111) films

Salmerón, Miquel; Neubauer, G.; Folch, Albert; Tomitori, Masahiko; Ogletree, D. Frank; Sautet, Philippe

doi:10.1021/la00036a041

Cited by 149 publications

(149 citation statements)

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“…Beyond a threshold tunneling current, 28,30,32 the tip may penetrate the monolayer, as demonstrated in Fig. 4(b).…”

Section: Abdulla Hel Al Mamun Et Almentioning

confidence: 95%

“…Because of small decay constant of alkanethiols, their existence increases the probability of the electrons tunneling from the Au substrate to the tip. 30 This indicated that the total conductance determined by the tunneling probability for a tunneling path Au-S → alkyl-chain → STM tip at low tunneling currents should exceed the conductance of the path through which the electrons tunnel directly from the Au substrate, i.e., Au → STM tip. Here, we considered the conductance of the region between the alkanethiol molecules to be lower than the conductance of the molecules themselves because this region did not have a bridge for electron transfer…”

Section: Effects Of Tunneling Current On Stm Imaging Mechanismmentioning

confidence: 99%

“…2(a) and 2(f)]. At the disordered regions (usually observed near gold vacancy islands or boundaries), the alkanethiol molecules may tilt at angles other than 30 o , so that they are no longer parallel and may entangle with one another. This leads to a lower physical height in these regions than in the ordered regions and the regions appear darker.…”

Section: Abdulla Hel Al Mamun Et Almentioning

confidence: 99%

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Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Mamun¹,

Bae²,

Hahn³

2011

Bulletin of the Korean Chemical Society

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We investigated the effects of tunneling current on scanning tunneling microscopy (STM) images of 1-octanethiol (OT) and 1-decanethiol (DT) self-assembled monolayers (SAMs). At a low tunneling current, the domain boundaries and ordered alkanethiol molecules were clearly resolved. As the tunneling current was increased at a constant bias voltage, however, the STM images showed disordered structures of the OT and DT SAMs. As the tunneling current was reduced back to low values, the ordered structures of the alkanethiol molecules reappeared. The reversibility of the process suggests that the sulfur head groups did not rearrange under any of the tunneling current conditions. On the basis of our observations, which are inconsistent with the standard model for STM imaging of molecules on metal surfaces, we consider the STM imaging mechanism in terms of a two-region tunneling junction model.

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“…Beyond a threshold tunneling current, 28,30,32 the tip may penetrate the monolayer, as demonstrated in Fig. 4(b).…”

Section: Abdulla Hel Al Mamun Et Almentioning

confidence: 95%

Section: Effects Of Tunneling Current On Stm Imaging Mechanismmentioning

confidence: 99%

Section: Abdulla Hel Al Mamun Et Almentioning

confidence: 99%

See 1 more Smart Citation

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Mamun¹,

Bae²,

Hahn³

2011

Bulletin of the Korean Chemical Society

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show abstract

“…40 Upon formation of a complete monolayer, the chemical nature of the surface is no longer defined by the composition of the underlying substrate but by the exposed functional groups of the monolayer. SAMs of different end functionalities have been used to tailor surface properties for adhesion, 41 lubrication, 42 wettability, 43 or protein physisorption. 44 Moreover, SAMs may be functionalized with reactive groups to which biological material is subsequently attached.…”

Section: Iiia Engineering Cell-adhesiveness Of a Substratementioning

confidence: 99%

Biology on a Chip: Microfabrication for Studying the Behavior of Cultured Cells

Tourovskaia

Folch

2003

Crit Rev Biomed Eng

173

140

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The ability to culture cells in vitro has revolutionized hypothesis testing in basic cell and molecular biology research and has become a standard methodology in drug screening and toxicology assays. However, the traditional cell culture methodology-consisting essentially of the immersion of a large population of cells in a homogeneous fluid medium-has become increasingly limiting, both from a fundamental point of view (cells in vivo are surrounded by complex spatiotemporal microenvironments) and from a practical perspective (scaling up the number of fluid handling steps and cell manipulations for high-throughput studies in vitro is prohibitively expensive). Micro fabrication technologies have enabled researchers to design, with micrometer control, the biochemical composition and topology of the substrate, the medium composition, as well as the type of neighboring cells surrounding the microenvironment of the cell. In addition, microtechnology is conceptually well suited for the development of fast, low-cost in vitro systems that allow for high-throughput culturing and analysis of cells under large numbers of conditions. Here we review a variety of applications of microfabrication in cell culture studies, with an emphasis on the biology of various cell types.

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“…The main appeal of C-AFM is the possibility to access local conductivity information down to the nanoscale and, at the same time, to explore significantly large areas of the sample surface during the scanning process [17,18]. This enables, in the specific case of NWs forest, to have single wire resolution but on a statistically significant number of NWs.…”

Section: Introductionmentioning

confidence: 99%

Conductive-probe atomic force microscopy as a characterization tool for nanowire-based solar cells

et al. 2017

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A B S T R A C TThe photonic properties of nanowires advocate for their utilization in next generation solar cells. Compared to traditional devices, the electric scheme is transformed from a single into an ensemble of pn junctions connected in parallel. This new configuration requires new schemes for the characterization. We show how conductiveprobe atomic force microscopy, C-AFM, is an essential tool for the characterization and optimization of this parallel-connected nanowire devices. With C-AFM it is possible to obtain both surface topography and local electrical characterization with nanoscale resolution. We demonstrate topography and current mapping of nanowire forests, combined with current-voltage measurements of the individual nanowire junctions from the ensemble. Our results provide discussion elements on some factors limiting the performance of a nanowire-based solar cell and thereby to provide a path for their improvement.

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Viscoelastic and electrical properties of self-assembled monolayers on gold (111) films

Cited by 149 publications

References 0 publications

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Effects of Tunneling Current on STM Imaging Mechanism for Alkanethiol Self-assembled Monolayers on Au(111)

Biology on a Chip: Microfabrication for Studying the Behavior of Cultured Cells

Conductive-probe atomic force microscopy as a characterization tool for nanowire-based solar cells

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