Comparisons of self-assembled monolayers on silver and gold: mixed monolayers derived from HS(CH2)21X and HS(CH2)10Y (X, Y = CH3, CH2OH) have similar properties

Laibinis, Paul E.; Fox, Marye Anne; Folkers, John P.; Whitesides, George M.

doi:10.1021/la00060a041

Cited by 195 publications

(174 citation statements)

References 10 publications

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“…Thus it serves as a measure for the order of the monolayer on the surface. Laibinis et al compared the wetting properties of SAMs on Au and Ag [49]. They have shown that the structural difference on the two surfaces does not play a significant role in the wettability and the interfacial composition of SAMs is the primary factor determining the wetting properties.…”

Section: Wettabilitymentioning

confidence: 99%

Current understanding of the structure, phase transitions and dynamics of self-assembled monolayers on two- and three-dimensional surfaces

Sandhyarani

Pradeep

2003

International Reviews in Physical Chemistry

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Section: Wettabilitymentioning

confidence: 99%

Current understanding of the structure, phase transitions and dynamics of self-assembled monolayers on two- and three-dimensional surfaces

Sandhyarani

Pradeep

2003

International Reviews in Physical Chemistry

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“…[ 24 ] Assuming that the TEGT thiol molecule has a foot print area of 0.214 nm 2 , [ 25 ] a ratio of about 1 biotin-KKKKC peptide per 14 TEGT molecules needs to be reached on the surface. As reported in the literature, [ 26 ] the ratio of two-components in solution are rarely identical from that in the SAM, due to the preferential adsorption of one of the components. Thus, systematic studies were carried out in order to understand how the ratios in solution diverge from the ratios in the SAM.…”

Section: Introductionmentioning

confidence: 75%

Tuning Specific Biomolecular Interactions Using Electro‐Switchable Oligopeptide Surfaces

Yeung

Iqbal

Allan

et al. 2010

Adv Funct Materials

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The ability to regulate biomolecular interactions on surfaces driven by an external stimuli is of great theoretical interest and practical impact in the biomedical and biotechnology fields. Herein, a new class of responsive surfaces that rely on electro‐switchable peptides to control biomolecular interactions on gold surfaces is presented. This system is based upon the conformational switching of positively charged oligolysine peptides that are tethered to a gold surface, such that bioactive molecular moieties (biotin) incorporated on the oligolysines can be reversibly exposed (bio‐active state) or concealed (bio‐inactive state) on demand, as a function of surface potential. The dynamics of switching the biological properties is studied by observing the binding events between biotin and fluorescently labeled NeutrAvidin. Fluorescence microscope images and surface plasmon resonance spectral data clearly reveal opposite binding behaviors when +0.3 V or −0.4 V vs. SCE are applied to the surface. High fluorescence intensities are observed for an applied positive potential, while minimal fluorescence is detected for an applied negative potential. Surface plasmon resonance spectroscopy (SPR) results provided further evidence that NeutrAvidin binding to the surface is controlled by the applied potential. A large SPR response is observed when a positive potential is applied on the surface, while a negative applied potential induces over 90% reduction in NeutrAvidin binding.

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“…[46][47][48][49][50][51][52][53][54][55] This technique has been extensively explored in the literature, although backfilling with secondary thiols has not been as thoroughly examined. Microcontact printing does have the distinct advantage of deposting SAMs directly and does not require any destructive treatments.…”

Section: Other Patterning Strategiesmentioning

confidence: 99%

Photoelectronic characterization of heterointerfaces.

Brumbach¹

2012

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In many devices such as solar cells, light emitting diodes, transistors, etc., the performance relies on the electronic structure at interfaces between materials within the device. The objective of this work was to perform robust characterization of hybrid (organic/inorganic) interfaces by tailoring the interfacial region for photoelectron spectroscopy. Self-assembled monolayers (SAM) were utilized to induce dipoles of various magnitudes at the interface. Additionally, SAMs of molecules with varying dipolar characteristics were mixed into spatially organized structures to systematically vary the apparent work function. Polymer thin films were characterized by depositing films of varying thicknesses on numerous substrates with and without interfacial modifications. Hard X-ray photoelectron spectroscopy (HAXPES) was performed to evaluate a buried interface between indium tin oxide (ITO), treated under various conditions, and poly(3-hexylthiophene) (P3HT). Conducting polymer films were found to be sufficiently conducting such that no significant charge redistribution in the polymer films was observed. Consequently, a further departure from uniform substrates was taken whereby electrically disconnected regions of the substrate presented ideally insulating interfacial contacts. In order to accomplish this novel strategy, interdigitated electrodes were used as the substrate. Conducting fingers of one half of the electrodes were electrically grounded while the other set of electrodes were electronically floating. This allowed for the evaluation of substrate charging on photoelectron spectra (SCOPES) in the presence of overlying semiconducting thin films. Such an experiment has never before been reported. This concept was developed out of the previous experiments on interfacial modification and thin film depositions and presents new opportunities for understanding chemical and electronic changes in a multitude of materials and interfaces. 4 ACKNOWLEDGMENTSMany people helped with various aspects of this project. I would like to thank

show abstract

Comparisons of self-assembled monolayers on silver and gold: mixed monolayers derived from HS(CH2)21X and HS(CH2)10Y (X, Y = CH3, CH2OH) have similar properties

Cited by 195 publications

References 10 publications

Current understanding of the structure, phase transitions and dynamics of self-assembled monolayers on two- and three-dimensional surfaces

Current understanding of the structure, phase transitions and dynamics of self-assembled monolayers on two- and three-dimensional surfaces

Tuning Specific Biomolecular Interactions Using Electro‐Switchable Oligopeptide Surfaces

Photoelectronic characterization of heterointerfaces.

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