Mixed carboranethiol self-assembled monolayers on gold surfaces

2017-08-15
Yavuz, Adem
Sohrabnia, Nima
Yılmaz, Ayşen
Danışman, Mehmet Fatih
Carboranethiol self-assembled monolayers on metal surfaces have been shown to be very convenient systems for surface engineering. Here we have studied pure and mixed self-assembled monolayers (SAMs) of three different carboranethiol (CT) isomers on gold surfaces. The isomers were chosen with dipole moments pointing parallel to (m-1-carboranethiol, M1), out of (m-9-carboranethiol, M9) and into (1-carboranethiol, 01) the surface plane, in order to investigate the effect of dipole moment orientation on the film properties. In addition, influence of the substrate surface morphology on the film properties was also studied by using flame annealed (FA) and template stripped (TS) gold surfaces. Contact angle measurements indicate that in M1/M9 and M1/01 mixed SAMs, M1 is the dominant species on the surface even for low M1 ratio in the growth solution. Whereas for 01/M9 mixed SAMs no clear evidence could be observed indicating dominance of one of the species over the other one. Though contact angle values were lower and hysteresis values were higher for SAMs grown on TS gold surfaces, the trends in the behavior of the contact angles with changing mixing ratio were identical for SAMs grown on both substrates. Atomic force microscopy images of the SAMs on TS gold surfaces indicate that the films have similar morphological properties regardless of mixing ratio.
APPLIED SURFACE SCIENCE

Suggestions

Single-molecule-resolution ultrafast near-field optical microscopy via plasmon lifetime extension
Ovalı, Rasim Volga ; Şahin, Ramazan; Bek, Alpan; Taşgın, Mehmet Emre (2021-06-14)
Metal nanostructures support plasmon oscillations on their surfaces, which normally decay very quickly. Nevertheless, the lifetime of these oscillations can be extended near a longer lifetime particle, e.g., a molecule. We utilize this phenomenon for ultrahigh (single-molecule) resolution ultrafast apertureless (scattering) applications. We demonstrate the phenomenon with the numerical solutions of 3D Maxwell equations. We use a nm-sized quantum emitter (QE) for the long lifetime particle. We place the QE a...
Simultaneous non-contact atomic force microscopy (nc-AFM)/STM imaging and force spectroscopy of Si(1 0 0)(2 × 1) with small oscillation amplitudes
Özer, H.Özgür; Atabak, Mehrdad; Ellialtǧlu, Recai M.; Oral, Ahmet (2002-03-28)
Si(1 0 0)(2 x 1) surface is imaged using a new non-contact atomic force microscopy (nc-AFM)/STM with sub-Angstrom oscillation amplitudes using stiff tungsten levers. Simultaneous force gradient and STM images of individual dimers and atomic scale defects are obtained. We measured force-distance (f-d) curves with different tips. Some of the tips show long force interactions, whereas some others resolve short-range interatomic force interactions. We observed that the tips showing short-range force interaction...
Microstructure hierarchy - Mechanical property relationship for hypereutectic Al-Si alloy powders solidified far from equilibrium
Kalay, Yunus Eren; Chumbley, L.s. (2006-12-01)
Microstructural selection in aluminum silicon powder alloys can directly influence the consolidated materials' mechanical properties. However, due to processing and characterization difficulties, a complete understanding of powder microstructure as a function of undercooling and solidification velocity, and the role microstructure plays on mechanical properties, remains an elusive goal. In this study high pressure gas atomization processing was used to produce rapidly solidified hypereutectic Al-Si alloys. ...
Mixed-monolayer of N-hydroxysuccinimide-terminated cross-linker and short alkanethiol to improve the efficiency of biomolecule binding for biosensing
Sadik, Demet Ataman; Eksi-Kocak, Haslet; Ertaş, Gülay; BOYACI, İSMAİL HAKKI; MUTLU, MEHMET (2018-09-01)
The goal of this study was to use a novel surface chemistry for modifying gold surfaces to decrease the steric hindrance, minimize the nonspecific bindings while providing directed immobilization of proteins for advancing the transducer property and to provide a biosensing platform for surface plasmon resonance (SPR) applications. Mixed self-assembled monolayers (mSAMs) were prepared using 3,3-Dithiodipropionic acid di (N-hydroxysuccinimide ester) (DSP) and 6-mercapto-1-hexanol (MCH) and the selected model ...
Helium atom diffraction study of low coverage phases of decanethiol self-assembled monolayers prepared by supersonic molecular beam deposition
Albayrak, E.; DUMAN, SONER; Bracco, G.; Danışman, Mehmet Fatih (2013-03-01)
Thiol self-assembled monolayers (SAMs) on gold surfaces have a wide range of applications including surface patterning and metal contact-organic semiconductor interface modification in organic electronic devices. Here we present our studies about the low coverage phases of decanethiol (CH3(CH2)(9)SH) SAMs on Au(1 1 1) surface, grown in vacuum by supersonic molecular beam deposition. Crystal structures, phase behaviors and desorption energies of these films determined by helium atom diffraction technique are...
Citation Formats
A. Yavuz, N. Sohrabnia, A. Yılmaz, and M. F. Danışman, “Mixed carboranethiol self-assembled monolayers on gold surfaces,” APPLIED SURFACE SCIENCE, pp. 233–241, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39427.