scholarly journals Mapping mechanical properties of organic thin films by force-modulation microscopy in aqueous media

2012 ◽  
Vol 3 ◽  
pp. 464-474 ◽  
Author(s):  
Jianming Zhang ◽  
Zehra Parlak ◽  
Carleen M Bowers ◽  
Terrence Oas ◽  
Stefan Zauscher
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Elastic Properties ◽  
Aqueous Media ◽  
Organic Thin Films ◽  
Self Assembled Monolayers ◽  
Force Modulation ◽  
High Lateral Resolution ◽  
Assembled Monolayers ◽  
Reliable Interpretation

The mechanical properties of organic and biomolecular thin films on surfaces play an important role in a broad range of applications. Although force-modulation microscopy (FMM) is used to map the apparent elastic properties of such films with high lateral resolution in air, it has rarely been applied in aqueous media. In this letter we describe the use of FMM to map the apparent elastic properties of self-assembled monolayers and end-tethered protein thin films in aqueous media. Furthermore, we describe a simple analysis of the contact mechanics that enables the selection of FMM imaging parameters and thus yields a reliable interpretation of the FMM image contrast.

The study of charge transport through organic thin films: mechanism, tools and applications

2007 ◽  
Vol 365 (1855) ◽  
pp. 1509-1537 ◽  
Author(s):  
Emily A Weiss ◽  
Jennah K Kriebel ◽  
Maria-Anita Rampi ◽  
George M Whitesides
Keyword(s):  
Thin Films ◽  
Charge Transport ◽  
Organic Molecules ◽  
Organic Thin Films ◽  
Theoretical Models ◽  
Experimental Methods ◽  
Self Assembled Monolayers ◽  
Current State ◽  
Molecular Scale ◽  
Assembled Monolayers

In this paper, we discuss the current state of organic and molecular-scale electronics, some experimental methods used to characterize charge transport through molecular junctions and some theoretical models (superexchange and barrier tunnelling models) used to explain experimental results. Junctions incorporating self-assembled monolayers of organic molecules—and, in particular, junctions with mercury-drop electrodes—are described in detail, as are the issues of irreproducibility associated with such junctions (due, in part, to defects at the metal–molecule interface).

Self-assembled Monolayers Preparation and Characterization of BiFeO3 Thin Films

2009 ◽  
Vol 25 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Guo-Qiang TAN ◽  
Hai-Yang BO ◽  
Hong-Yan MIAO ◽  
Ao XIA ◽  
Zhong-Liang HE
Keyword(s):  
Thin Films ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Nanoporous Thin Films Formed from Photocleavable Diblock Copolymers on Gold Substrates Modified with Thiolate Self-Assembled Monolayers

Langmuir ◽  
2020 ◽  
Vol 36 (31) ◽  
pp. 9259-9268 ◽  
Author(s):  
Takashi Ito ◽  
Herman Coceancigh ◽  
Yi Yi ◽  
Jay N. Sharma ◽  
Fred C. Parks ◽  
...  
Keyword(s):  
Thin Films ◽  
Diblock Copolymers ◽  
Self Assembled Monolayers ◽  
Gold Substrates ◽  
Assembled Monolayers ◽  
Self Assembled

Formation and stability of porphyrin and phthalocyanine self-assembled monolayers on ZnO surfaces

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1264-1271 ◽  
Author(s):  
Hanna Hakola ◽  
Essi Sariola-Leikas ◽  
Paavo Jäntti ◽  
Thomas Mokus ◽  
Kati Stranius ◽  
...  
Keyword(s):  
Thin Films ◽  
Zno Nanorods ◽  
Self Assembled Monolayers ◽  
Layer Formation ◽  
Zno Film ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Anchoring Groups ◽  
The Stability ◽  
Phosphate Groups

Formation of self-assembled monolayers (SAMs) of three porphyrin and one phthalocyanine derivatives on thin ZnO film was studied by monitoring absorption spectra of the samples. The compounds were equipped with carboxylic or phosphate groups to bind to the surface. The SAM formation was found to be fast. The layer was formed in less than 15 min for all studied porphyrins, and 30 min was sufficient to form phthalocyanine layer. For porphyrins with different anchor groups the SAM formation was too fast to see any difference between the anchoring groups. The stability of SAMs was tested then by immersing the samples into neat solvents. Upon immersion the SAMs were gradually losing the absorbance for all the compounds with degradation trends being in line with p[Formula: see text] values of the binding groups of the same type. However, even for the weakest binding group the SAM was relatively stable after a few tens of minutes of washing, which was sufficient to remove physisorbed compounds but the SAM was essentially not destroyed. Comparison of SAMs on thin films with SAMs on ZnO nanorods and TiO2 nanoparticle films indicated the same fast layer formation but relatively weaker SAMs stability, showing 20–40% faster absorption losses during the washing.

Development of calix[4]arenes modified at their narrow- and wider-rims as potential metal ions sensor layers for microcantilever sensors: further studies

2021 ◽  
Author(s):  
Paris E. Georghiou ◽  
Shofiur Rahman ◽  
Yousif Assiri ◽  
Gopi Kishore Valluru ◽  
Melita Menelaou ◽  
...  
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Computational Study ◽  
Aqueous Media ◽  
Experimental Studies ◽  
Ionic Species ◽  
Alkoxy Group ◽  
Self Assembled Monolayers ◽  
Microcantilever Sensors ◽  
Assembled Monolayers

The development of a microcantilever (MCL) sensing device capable of simultaneously detecting several metal ionic species in aqueous media with low limits of detection requires a variety of sensing layers which are ion-specific. Calix[4]arenes are robust molecules which can be easily modified and have been extensively studied for their ion binding properties. They are also capable of forming self-assembled monolayers (SAMs) onto the gold layers of MCLs and are capable of detecting various metal ions with different anionic counterions in aqueous solutions. In this paper we report on the effect of the alkoxy group in the narrow rim [O-(alkoxycarbonyl)methoxy] substituents of bimodal calix[4]arenes which have been used as metal ion MCL sensing layers, using classical solution state experimental studies. A DFT computational study to compare the experimental results with several metal ions is also reported herein.

The influence of 2D nanomaterials on electron transfer across molecular thin films

2019 ◽  
Vol 4 (2) ◽  
pp. 431-436
Author(s):  
Na Kong ◽  
Shuang Zhang ◽  
Jing Liu ◽  
Jianmei Wang ◽  
Zhen Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Electron Transfer ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
2D Nanomaterials ◽  
Electron Transfer Pathways ◽  
Molecular Thin Films ◽  
Self Assembled

Design and formation of electron transfer pathways across self-assembled monolayers by the hydrophobic attachment of BN-NH2 and MoS2 nanosheets.

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