Myung Mo Sung

Densely-packed alkyl monolayers similar to those previously reported by Linford et al.1,2 are formed by the reaction of 1-alkenes with hydrogen-terminated surfaces of both Si(111) and Si(100). The thermal behavior of these monolayers in vacuum has been studied using high-resolution electron energy loss spectroscopy. Both on Si(111) and on Si(100), the monolayers are found to be stable up to about 615 K. Desorption is signaled by a decrease in the intensity of C−H modes, accompanied by the appear

Self-assembled monolayers of alkanethiols have been formed on oxidized surfaces of polycrystalline copper. For comparison, the monolayers were formed on clean copper surfaces. X-ray photoelectron spectroscopy (XPS), contact angle analysis, ellipsometry, and gas chromatography−mass spectrometry (GC−MS) have been employed to investigate the structure, formation, and thermal behavior of these monolayers. The results indicate that the structures of the monolayers on both surfaces are similar in qual

Abstract A one‐step process to generate single‐crystal organic nanowire arrays using a direct printing method (liquid‐bridge‐mediated nanotransfer molding) that enables the simultaneous synthesis, alignment, and patterning of nanowires from molecular ink solutions is reported. Using this method, many single‐crystal organic nanowires can easily be synthesized by self‐assembly and crystallization of organic molecules within the nanoscale channels of molds, and these nanowires can then be directly

Inkjet-assisted nanotransfer printing (inkjet-NTP) facilitates spatial control of many arrays of various organic functional materials on a single substrate with a high-throughput integration process, enabling monolithic integration of various organic nanopatterns. Inkjet-NTP enables wafer-scale organic electronic circuits composed of field-effect transistors, complementary inverters, and p-n diodes, demonstrating its capability to produce a high-performance, multifunctional organic chip.

A new indolocabazole derivative possessing an extended aromatic core and solubilizing long aliphatic chains effectively self-assembles and crystallizes within the nanoscale channels to form single-crystal nanowires via a direct printing method from an ink solution. Single-crystal organic nanowire transistor arrays based on the π-extended indolocarbazole derivative exhibit an excellent hole mobility of 1.5 cm² V⁻¹ s⁻¹ and outstanding environmental stability.

Thin films not thin on the ground: The title films were grown by molecular layer deposition involving repeated sequential adsorption of diethylzinc (DEZ) and hexadiyne diol (HDD) with UV polymerization. The prepared zinc oxide cross-linked polydiacetylene films exhibited good thermal and mechanical stabilities, enhanced carrier mobility (>1.3 cm2 V−1 s), and other favorable properties owing to their 2D structures. Detailed facts of importance to specialist readers are published as ”Supporting In

We present UV-ALD as a promising approach to fabricate effective gas-diffusion barrier thin films at low deposition temperature (40 °C).

The composition and structure of the n-type GaN{0001\ifmmode\bar\else\textasciimacron\fi{}}-(1\ifmmode\times\else\texttimes\fi{}1) surface of samples grown on sapphire by organometallic vapor-phase epitaxy (OMVPE) has been determined through the use of time-of-flight scattering and recoiling spectrometry (TOF-SARS), three-dimensional classical ion trajectory simulations, low-energy electron diffraction (LEED), and thermal decomposition mass spectrometry (MS). Elastic recoil detection was used to

The structure of alkylsiloxane self-assembled monolayers formed on HF-treated Si3N4 has been studied using x-ray photoelectron spectroscopy, high-resolution electron energy-loss spectroscopy, and contact angle analysis. It is shown that the monolayers are similar in quality to those formed on oxidized silicon, despite the fact that upon etching in HF, the Si3N4 surface contains only 0.2 ML of oxygen. In contrast, on NH4F-treated Si(100) surfaces with similar quantities of oxygen, high-quality mo

We fabricated single-crystal poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]-dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4-c]pyridine] (PCDTPT) nanowires with ultrahigh mobility using a liquid-bridge-mediated nanotransfer molding method. The structural analysis of the single-crystal PCDTPT nanowires reveals that PCDTPT crystals have a triclinic structure, and the nanowires grow parallel to PCDTPT backbone chains, which provide important insights into its intrinsic charge transport. The single

Hermetic sealing is an important technology for isolating and protecting air-sensitive materials and is key in the development of foldable and stretchable electronic devices. Here we report an ultra gas-proof polymer hybrid thin layer prepared by filling the free volume of the polymer with Al₂O₃ using gas-phase atomic layer infiltration. The high-density polymer-inorganic hybrid shows extremely low gas transmission rate, below the detection limit of the Ca corrosion test (w

Water-mediated nanotransfer printing (nTP) is based on the direct transfer of a metal thin film from a stamp to a substrate via water-mediated surface bonding between the stamp and the substrate. The procedure can generate aluminum patterns with feature sizes as small as 60 nm (see figure). The transferred Al patterns are chemically bound to the substrate surface and, thus, exhibit strong adhesion.

The surface of long TiO2 nanotube (NT) electrodes in dye-sensitized solar cells (DSSCs) was modified without post-annealing by using atomic layer deposition (ALD) for the enhancement of photovoltage. Vertically oriented TiO2 NT electrodes with highly ordered and crack-free surface structures over large areas were prepared by a two-step anodization method. The prepared TiO2 NTs had a pore size of 80 nm, and a length of 23 μm. Onto these TiO2 NTs, an Al2O3 shell of a precisely controlled thickness