Air Stability of Alkanethiol Self-Assembled Monolayers on Silver and Gold Surfaces

Schoenfisch, Mark H.; Pemberton, Jeanne E.

doi:10.1021/ja974301t

Cited by 509 publications

(527 citation statements)

References 37 publications

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“…In addition, we have confirmed that the modes associated with the sulfur oxidation analyzed in Ref. 31 were not observed in our measurements either. …”

Section: Resultssupporting

confidence: 90%

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

2012

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The surface-enhanced Raman scattering (SERS) signal from an AgFON plasmonic substrate, recoated with benzenethiol, was observed to increase by about 100% upon heating for 3.5 min at 100 °C and 1.5 min at 125 °C. The signal intensity was found to increase further by about 80% upon a 10 s exposure to a high-intensity (3.2 kW/cm2) 785 nm CW laser, corresponding to 40 mW in a 40 ± 5 μm diameter spot. The observed increase in the SERS signal may be understood by considering the presence of benzenethiol molecules in an intermediate or “precursor” state in addition to conventionally ordered molecules forming a self-assembled monolayer. The increase in the SERS signal arises from the conversion of the molecules in the precursor state to the chemisorbed state due to thermal and photothermal effects.

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“…In addition, we have confirmed that the modes associated with the sulfur oxidation analyzed in Ref. 31 were not observed in our measurements either. …”

Section: Resultssupporting

confidence: 90%

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

2012

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“…51 We note that experiments by Schoenfisch and Pemberton suggest ozone as the primary oxidant in ambient laboratory air. 52 The oxidized SAM is far less strongly bound to the gold, 53 and hence drastically compromises the viability of the final molecular device. The stability over time is particularly an issue when long multi-step fabrication processes are employed, such that the alkanethiol layer has time to oxidize, and with assemblies on nanoparticles, where the high radius of curvature makes it easy for oxygen to reach the gold-thiolate bond.…”

Section: Alkanethiol and Organosulfur Self-assembled Monolayermentioning

confidence: 99%

The molecular level modification of surfaces: from self-assembled monolayers to complex molecular assemblies

2011

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The modification of surfaces with self-assembled monolayers (SAMs) containing multiple different molecules, or containing molecules with multiple different functional components, or both, has become increasingly popular over the last two decades. This explosion of interest is primarily related to the ability to control the modification of interfaces with something approaching molecular level control and to the ability to characterise the molecular constructs by which the surface is modified. Over this time the level of sophistication of molecular constructs, and the level of knowledge related to how to fabricate molecular constructs on surfaces have advanced enormously. This critical review aims to guide researchers interested in modifying surfaces with a high degree of control to the use of organic layers. Highlighted are some of the issues to consider when working with SAMs, as well as some of the lessons learnt (169 references). 2011 The Royal Society of Chemistry. The modification of surfaces with self-assembled monolayers (SAMs) containing multiple different molecules, or containing molecules with multiple different functional components, or both, has become increasingly popular over the last two decades. This explosion of interest is primarily related to the ability to control the modification of interfaces with something approaching molecular level control and to the ability to characterise the molecular constructs by which the surface is modified. Over this time the level of sophistication of molecular constructs, and the level of knowledge related to how to fabricate molecular constructs on surfaces have advanced enormously. This critical review aims to guide researchers interested in modifying surfaces with a high degree of control to the use of organic layers. Highlighted are some of the issues to consider when working with SAMs, as well as some of the lessons learnt (169 references).

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“…Studies suggest that these monolayer-protected clusters are stable in air at room temperature for 6 months. Recently, we have shown that ozone can oxidize the monolayer [71], as in the case of 2D SAMs [72]. Sulfur head-group gets oxidized, and this results in desorption of some of the molecules as evidenced by the loss of intensity of the CH modes in the IR spectrum.…”

confidence: 99%

Structure and dynamics of monolayers on planar and cluster surfaces

Pradeep

Sandhyarani

2002

Pure and Applied Chemistry

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Organized molecular assemblies have been one of the intensely pursued areas of contemporary chemistry. Among the various methodologies used to make organized monolayer structures, self-assembled monolayers (SAMs) have been attractive to many materials chemists owing to the simplicity of the preparative method and high stability. Advances in various techniques and their application in the study of SAMs have significantly improved our understanding of these molecular systems. These studies have been further intensified since the successful preparation of stable metal clusters protected with monolayers. This article reviews the structure, temperature-induced phase transitions, and associated dynamics of monolayers, principally in the context of our own work in this area. Alkanethiols on Au (111) and Ag(111) are taken as archetypal systems to discuss the properties of 2D SAMs; studies from our laboratory have been on evaporated thin films. Alkanethiols on Au and Ag cluster surfaces are taken as examples of 3D SAMs. Although our principal focus will be on alkanethiols, we will touch upon a few other adsorbate systems as well.

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Air Stability of Alkanethiol Self-Assembled Monolayers on Silver and Gold Surfaces

Cited by 509 publications

References 37 publications

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

The molecular level modification of surfaces: from self-assembled monolayers to complex molecular assemblies

Structure and dynamics of monolayers on planar and cluster surfaces

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