THE KINETICS OF THE AS GROWN AND ANNEALED SELF-ASSEMBLED MONOLAYER STUDIED BY FORCE SPECTROSCOPY

2018 ◽  
Vol 25 (02) ◽  
pp. 1850054
Author(s):  
HUMA HABIB ◽  
M. YASAR ◽  
S. MEHMOOD ◽  
SAIMA RAFIQUE ◽  
A. S. BHATTI ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Self Assembly ◽  
Surface Coverage ◽  
Work Of Adhesion ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Alkane Thiol ◽  
Self Assembled ◽  
Kinetics Of

The growth of biological systems like DNA, peptides and proteins are accredited to the self-assembly processes from the molecular level to the nanoscale. The flawless immobilization of DNA on any surface is quite an important step to the development of DNA-based biosensors. The present paper reports the use of atomic force microscopy to determine the mechanical properties of the as grown and annealed self-assembled monolayer (SAM) as well as the mutated DNA immobilized on the SAM. The SAM of alkane thiol (16-mercapto-1-hexadecanol) was developed on Au surface, which was then annealed and analyzed for its structural and mechanical properties. The surface coverage, height and monolayer’s order was studied as a function of incubation time and annealing time. Excessive annealing led to the defragmentation and desorption of SAM structures due to breaking of hydrocarbon bonds. AFM was employed to determine the detach separation, pull-off and work of adhesion of the as grown and annealed SAM.

Comparative Study of Field Emission-Scanning Electron Microscopy and Atomic Force Microscopy to Assess Self-assembled Monolayer Coverage on Any Type of Substrate

1999 ◽  
Vol 5 (6) ◽  
pp. 413-419 ◽  
Author(s):  
Bernardo R.A. Neves ◽  
Michael E. Salmon ◽  
Phillip E. Russell ◽  
E. Barry Troughton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Comparative Study ◽  
Field Emission ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Self Assembled ◽  
Scanning Electron

Abstract: In this work, we show how field emission–scanning electron microscopy (FE-SEM) can be a useful tool for the study of self-assembled monolayer systems. We have carried out a comparative study using FE-SEM and atomic force microscopy (AFM) to assess the morphology and coverage of self-assembled monolayers (SAM) on different substrates. The results show that FE-SEM images present the same qualitative information obtained by AFM images when the SAM is deposited on a smooth substrate (e.g., mica). Further experiments with rough substrates (e.g., Al grains on glass) show that FE-SEM is capable of unambiguously identifying SAMs on any type of substrate, whereas AFM has significant difficulties in identifying SAMs on rough surfaces.

Mechanical Properties of Oligothiophene Self Assembled Films by Atomic Force Microscopy.

2005 ◽  
Vol 871 ◽  
Author(s):  
Imma Ratera ◽  
Jinyu Chen ◽  
Amanda Murphy ◽  
Frank Ogletree ◽  
Jean M. J. Fréchet ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Self Assembled Monolayers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Cell Dimensions ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Unit Cell Dimensions

AbstractThe oligothiophene derivative (4-(5″″-tetradecyl-[2,2′;5′,2″;5″,2″′;5″′,2″″] pentathiophen-5-yl)-butyric acid (C14-5TBA) was synthesized and the structural and mechanical properties of self-assembled monolayers on mica have been studied by atomic force microscopy (AFM). The films were prepared by drop casting a dilute THF solution (1mM) of the oligothiphene on mica. Islands containing primarily monolayers with a very small percentage of multilayers were formed. The molecules adsorb through the carboxylic group, and expose the alkyl chain (CH2)13CH3. High resolution AFM scans reveal a well ordered structure of molecules with unit cell dimensions of 0.65 and 0.46 nm. Applying load to the tip, the molecular film was gradually compressed from an initial height of 4.1nm to a final one of 2.6 nm, corresponding to atilt of the alkyl chains. In regions covered with bilayers the molecules in the second layer were oriented opposite to those in the first layer, thus exposing the carboxylic end group to the air. These second layer was easily removed as the tip pressure increased.

Adhesion and Friction at Graphene/Self-Assembled Monolayer Interfaces Investigated by Atomic Force Microscopy

2017 ◽  
Vol 121 (10) ◽  
pp. 5635-5641 ◽  
Author(s):  
Meagan B. Elinski ◽  
Benjamin D. Menard ◽  
Zhuotong Liu ◽  
James D. Batteas
Keyword(s):  
Atomic Force Microscopy ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Self Assembled

scholarly journals Molecular-scale structures of the surface and hydration shell of bioinert mixed-charged self-assembled monolayers investigated by frequency modulation atomic force microscopy

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24660-24664
Author(s):  
Yuki Araki ◽  
Taito Sekine ◽  
Ryongsok Chang ◽  
Tomohiro Hayashi ◽  
Hiroshi Onishi
Keyword(s):  
Hydration Shell ◽  
Self Assembled Monolayers ◽  
Water Molecules ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Molecular Scale ◽  
Assembled Monolayers ◽  
Scale Structures ◽  
Self Assembled

Water molecules above a bioinert mixed-charged self-assembled monolayer (MC-SAM) surface are highly structured compared to those of bioactive SAM surfaces.

scholarly journals Growth and Switching of Ferroelectric Nanocrystals from Ultrathin Film of Copolymer of Vinylidene Fluoride and Trifluoroethylene

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
R. Gaynutdinov ◽  
V. Fridkin ◽  
H. Kliem
Keyword(s):  
Self Assembly ◽  
Vinylidene Fluoride ◽  
Paraelectric Phase ◽  
Orthorhombic Space Group ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Storage Media ◽  
Atomic Force ◽  
Kinetics Of

The ferroelectric nanocrystals of the copolymer of vinylidene fluoride and trifluoroethylene P(VDF-TrFE) were grown from ultrathin Langmuir-Blodgett (LB) films on Si substrate. The annealing of ultrathin LB films with thickness of 3 monolayers (5 nm) in air in paraelectric phase at temperature 125∘C was performed. The self-assembly leads to the growth of nanocrystals of ferroelectric copolymer 15–25 nm thick and 100–200 nm in diameter. The nanocrystals presumably belong to orthorhombic space group, where axis 2 is the direction of spontaneous polarization (and normal to substrate). By means of atomic force microscopy (AFM), the kinetics of ferroelectric nanocrystals growth and their switching were investigated. The obtained results confirm the conclusions that copolymer nanocrystals are candidates for high-density nonvolatile storage media devices.

Morphological and mechanical properties of alkanethiol self-assembled monolayers investigated via bimodal atomic force microscopy

2011 ◽  
Vol 47 (31) ◽  
pp. 8823 ◽  
Author(s):  
Cristiano Albonetti ◽  
Stefano Casalini ◽  
Francesco Borgatti ◽  
Luca Floreano ◽  
Fabio Biscarini
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Self Assembled Monolayers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembled Monolayers ◽  
Self Assembled

Atomic Force Microscopy of Self-Assembled Nanostructures of TPPS4 on SAM Substrates

2004 ◽  
Vol 97-98 ◽  
pp. 195-200 ◽  
Author(s):  
R. Augulis ◽  
R. Valiokas ◽  
B. Liedberg ◽  
R. Rotomskis
Keyword(s):  
Atomic Force Microscopy ◽  
Substrate Surface ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Polar Groups ◽  
Atomic Force ◽  
Adsorption Of Organic Molecules ◽  
J Aggregates ◽  
Self Assembled ◽  
Highly Correlated

The adsorption of organic molecules on solid surfaces is one of the fundamental processes for the development of molecular-based nanodevices. Here we focus on the adsorption and ordering of the TPPS4-based J-aggregates on silicon and gold as well as on self-assembled monolayer (SAM) surfaces. The SAMs used for the experiments were based on the chemisorption of thiol containing compounds onto gold. Long ω-substituted alkanethiols are spontaneously assembled on gold to form highly ordered and densely packed layers with controllable chemical and physical properties. TPPS4 J-aggregates were dispersed on SAM surfaces, and on plain gold and silicon substrates for comparison. The dimensions of aggregates, measured by means of atomic force microscopy, varied depending on the type of substrate. Long stripe-like aggregates were flattened on the substrate surface, and the height and width of aggregates highly correlated with the polarity of surface groups. For example, the J-aggregates were narrower on hydrophobic substrates (with non-polar groups) and wider on hydrophilic substrates (with polar groups). These observations support the hypothesis, that TPPS4 forms .soft. cylindrical aggregates, that appear flattened on the substrate.

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