Department of Chemistry, Hanyang University, Seoul 133-791, KoreaReceived January 13, 2010, Accepted February 8, 2011Key Words : Copper, Dissociative adsorption, Reconstruction, Thin film Oxidation of copper is known to occur during corrosionprocess, but if the oxidation is controlled under rightcondition, desirable oxide thin layers that can be applied inelectronic devices, as protective layers against corrosion,and as heterogeneous catalysts for various chemical reac-tions could be generated.

Copper oxide

10.5012/bkcs.2011.32.4.1129

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Negative Thermal Effects on the Structural Order of Methoxy–terminated Mono(Ethylene Glycol) Ethanethiol Self‐assembled Monolayers on Au(111)

Bulletin of the Korean Chemical Society (2019)

Hungu Kang Sicheon Seong Seulki Han Young Ji Son Jongik Park

Ethanethiol

Self-assembled monolayer

10.1002/bkcs.11690

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Molecular-Scale Investigation of Tolane Disulfide Self-Assembled Monolayers on Au(111) Using Scanning Tunneling Microscopy

Journal of Nanoscience and Nanotechnology (2011)

Taesung Park Hungu Kang Youngdo Jeong Changjin Lee Youngil Lee

Molecular-scale surface structures of self-assembled monolayers (SAMs) formed by the spontaneous adsorption of tolane disulfides (TDS) on Au(111) in a 1 mM mixed solution of ethanol/N, N'-dimethylformamide (9:1) were examined using scanning tunneling microscopy (STM). The STM study revealed that TDS SAMs formed after a 24 h immersion at room temperature were composed of two-dimensional (2D) ordered phases with inhomogeneous surface morphologies and no clear domain boundaries. However, after 2 h immersion at 50 degrees C, uniform 2D ordered domains with clear domain boundaries were observed, which could be described as c(3 x square root of 3) structures with centered rectangular unit cell. Interestingly, a unique intermediate ordered phase with a low surface coverage was also observed. After a longer immersion for 24 h at 50 degrees C, only the uniform c(3 x square root of 3) domains were observed with a corrugation that may have reflected surface reconstruction of the Au(111) surfaces. From this study, we found that 2D ordered TDS SAMs with large and uniform domains on Au(111) can be obtained by controlling the solution temperature and immersion time.

Immersion

10.1166/jnn.2011.3633

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Citations (1)

Two-dimensional alignment of imogolite on a solid surface

Chemical Communications (2007)

Sungjin Park Yun-Ha Lee Bumjung Kim Ji Sun Lee Youngdo Jeong

Surface modified imogolite fiber, hydrated aluminium silicate that has the shape of a rigid hollow cylinder, was aligned with consistent nano spacing and was visualized by scanning tunneling microscopy.

Imogolite

10.1039/b706505a

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Citations (27)

Structural Effect on Formation of Alkylsilane Self-Assembled Monolayers on Indium Tin Oxide Surface

Molecular Crystals and Liquid Crystals (2008)

Youngsik Choi Jaegeun Noh

The effects of immersion time and the number of chlorine attached to silane atom on the formation of self-assembled monolayers (SAMs) on indium tin oxide (ITO) surface were examined by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and contact angle measurements. Among octadecyltrichlorosilane (OTS), octadecyldichloromethylsilane (ODDMS), and octadecyldimethylchlorosilane (ODMS), OTS SAMs on ITO surface formed after 1 h deposition at room temperature have a high contact angle value of 86° compared to ODDMS and ODMS SAMs with 45° and 31°, reflecting that OTS on ITO surface would form a high-quality SAMs with a hydrophobic surface. STM imaging revealed that the surface structure of OTS SAMs on ITO surface was markedly different from that of bare ITO surface resulting from the the adsorption of OTS molecules. In addition, XPS measurements showed that the formation of OTS SAMs is strongly driven by the chemical reactions between the Si atoms and the hydroxyl group of ITO surface during self-assembly.

Octadecyltrichlorosilane

Indium tin oxide

Self-assembled monolayer

10.1080/15421400802330556

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A new arene–Ru based supramolecular coordination complex for efficient binding and selective sensing of green fluorescent protein

Dalton Transactions (2013)

Anurag Mishra Sambandam Ravikumar Young Ho Song Saravanan Prabhu Nadarajan Hyunuk Kim

A new dipyridyl ligand is encoded with 120° angularity between its coordination vectors by using a central pyridine carboxamide scaffold to orient two 4-(pyridin-4-ylethynyl)phenyl moieties. The N,N'-bis(4-(pyridin-4-ylethynyl)phenyl)pyridine-2,6-dicarboxamide ligand undergoes self-assembly with a diruthenium arene complex to furnish a [2 + 2] metallacycle with a wedge-like structure. The metallacycle binds to the enhanced green fluorescent protein (EGFP) variant of GFP, resulting in steady-state spectral changes in UV-Vis absorption and emission experiments. These studies indicate that the metallacycle induces conformation changes to the EGFP, disrupting the tripeptide chromophore. Furthermore, gel electrophoresis, circular dichroism and atomic force microscopy studies indicate that binding ultimately leads to aggregation of the protein. Computational investigations indicate a favorable interaction, predominantly between the metallacycle and the Arg168 residue of the EGFP. An interaction with Arg168 and related residues was previously observed for an emission-attenuating antibody, supporting that these interactions induce changes to the photophysical properties of EGFP by disrupting the tripeptidechromophore in a similar manner. Additionally, we have also described the quenching study of the reporter GFP protein in vivo by a new metal complex using reflected fluorescence microscopy. We anticipate that such metal complexes which can passively diffuse into the cells in vivo can serve as potential tools in molecular and drug targeting based biological studies.

Fluorescent protein

Calixarene

10.1039/c3dt53186d

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Citations (42)

Studies on the Adsorbed States of Alkanethiol Self-Assembled Monolayers on Au(111) by Thermal Desorption Spectroscopy

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals (1999)

Jaegeun Noh Masahiko Hara Wolfgang Knoll

Abstract Desorption of octadecanethiol self-assembled monolayers (SAMs) on gold was investigated by thermal desorption spectroscopy (TDS). The TDS study shows that there exist some different adsorbed states, such as monomer and dimer, and the dimerization processes also play a very important role during the SAM formation and desorption.

Thermal desorption spectroscopy

Thermal desorption

Self-assembled monolayer

10.1080/10587259908023402

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Citations (2)

Influence of Thiol Molecular Backbone Structure on the Formation and Reductive Desorption of Self-Assembled Aromatic and Alicyclic Thiol Monolayers on Au(111) Surface

Bulletin of the Korean Chemical Society (2013)

Hungu Kang Jaegeun Noh

The surface structure and electrochemical behavior of self-assembled monolayers (SAMs) prepared from benzenethiol (BT), cyclohexanethiol (CHT), and cyclopentanethiol (CPT) on Au(111) surface were examined by scanning tunneling microscopy (STM) and cyclic voltammetry (CV) to understand the influence of thiol molecular backbone structure on the formation and reductive desorption behavior of SAMs. STM imaging showed that BT and CPT SAMs on Au(111) surface formed at room temperature were mainly composed of disordered domains, whereas CHT SAMs were composed of well-ordered domains with three orientations. From these STM results, we suggest that molecule-substrate interaction is a key parameter for determining the structural order and disorder of simple aromatic and alicyclic thiol SAMs on Au(111). In addition, the reductive desorption peak potential for BT SAMs with aromatic rings was observed at a less negative potential of -566 mV compared to CHT SAMs (-779 mV) or CPT SAMs (-775 mV) with aliphatic cyclic rings. This reductive desorption behavior for BT SAMs is due to the presence of p-orbitals on the aromatic rings, which promote facile electron transfer from the Au electrode to BT as compared to CHT and CPT. We also confirmed that the reductive desorption behavior for simple alicyclic thiol SAMs such as CHT and CPT SAMs on Au electrodes was not significantly influenced by the degree of structural order.

Alicyclic compound

Self-assembled monolayer

Thiol

10.5012/bkcs.2013.34.5.1383

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Citations (12)