Mi-Ran Kim

Homoleptic tris-cyclometalated iridium complexes, fac-Ir[5-(2-RCB)ppy]3 (3a-3c; CB = o-carboran-1-yl; ppy = 2-phenylpyridinato-C(2),N; R = H (3a), Me (3b), (i)Bu (3c)) with 2-R-substituted o-carboranes at the 5-position of the ppy ligand, were prepared and characterized. X-ray diffraction analysis of 3a and 3c revealed that the three C^N ligands adopt a fac-arrangement around the Ir atom and that the carboranyl C-C bond distance increases with increasing steric effects of the 2-R substituent. Th

Methylammonium lead trihalide perovskites CH3NH3PbX3 (X = Cl, Br, and I) have recently attracted huge attention as a promising candidate for highly efficient solar cell absorber materials. To understand the physical properties of halide perovskites, we investigated the CH3NH3PbCl3 single crystal by Raman scattering spectroscopy from 80 K to room temperature. Benchmarking the phonon modes and their Raman activities obtained by density functional calculations, we successfully assign the molecular

Investigations into the phase transition of Barluenga’s reagent revealed a transient incommensurately modulated phase; the structures are presented herein. To understand the origin of the modulated phase and the chemistry that can affect it, analogues of Barluenga’s reagent were synthesized and studied. In this context, the halogen and anion can easily be exchanged. Studying different analogues led to the development of the Ratchet Model to describe the behavior in the solid state leading to a b

Abstract Despite the emerging scientific interest in polymer‐based stretchable electronics, the trade‐off between the crystallinity and stretchability of intrinsically stretchable polymer semiconductors—charge‐carrier mobility increases as crystallinity increases while stretchability decreases—hinders the development of high‐performance stretchable electronics. Herein, a highly stretchable polymer semiconductor is reported that shows concurrently improved thin film crystallinity and stretchabili

Dopamine (DA) surface chemistry has received significant attention because of its applicability in a wide range of research fields and the ability to graft functional molecules onto numerous solid surfaces. Various DA derivatives have been newly synthesized to identify key factors affecting the coating efficiency and to advance the coating system development. The oxidation of catechol into quinone followed by internal cyclization via the nucleophilic attack of primary amine is crucial for DA-bas

X-ray absorption spectroscopy reveals the local structures of atomic-layer-deposited vanadium oxide films subject to heat treatments.

Among various conductive polymers, the poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) film has been studied as a promising material for use as a transparent electrode and a hole-injecting layer in organic optoelectronic devices. Due to the increasing demand for the low-cost fabrication of organic light-emitting diodes (OLEDs), PEDOT:PSS has been employed as the top electrode by using the coating or lamination method. Herein, a facile method is reported for the fabrication

To increase their efficiency and improve their chemical stability, hybrid organic–inorganic perovskites (HOIPs) have been studied intensely over the past few years. There are some unresolved issues with the properties of HOIPs, such as the relation between the configuration of methylammonium (MA) ions and their electronic and structural properties. For example, it was theoretically proposed that the change in the bandgap from direct to indirect and/or structural distortion can be caused by a cha

This study investigates a hybrid lamination electrode based on a silver nanowire and a conductive polymer for the top electrode of bi-directional polymer light-emitting diodes (PLEDs). Through a vacuum-free hot-press lamination step, the proposed hybrid electrode employed a complete and concrete electrical contact with the underlying emissive polymer layer. In addition, by inserting a hole injecting poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) layer to increase the level o

The present study investigated the sensory characteristics of 31 types of gochujang, a Korean fermented chili paste, produced in various regions of Korea. Generic descriptive analysis was conducted to analyze the sensory properties of the samples. Among these, four samples were selected for consumer taste test based on their distinct sensory profiles. The drivers of liking for gochujang were identified when the samples were applied to four different food systems. Consumers (age range: 20’s– 60’s

We report the facile growth of one-dimensional strontium rhodium oxide (Sr 6 Rh 5 O 15 ) nanofibers with high crystallinity by utilizing an electrospinning process, followed by thermal annealing. The Sr 6 Rh 5 O 15 nanofibers retain their characteristic fibrous nanostructure with notably rough surface morphologies even after annealing at 900 °C, demonstrating outstanding structural durability at harsh temperatures. The crystal structure of the Sr 6 Rh 5 O 15 nanofibers was examined through X-ray

Naphthalene trisulfonate is found to have versatile surface coating capability when combined with hafnium(IV) ions, thereby forming complexes. Solid substrates such as titanium/titanium dioxide, glass, and nylon immersed in a solution of naphthalene trisulfonate and Hf^IV produces naphthalene trisulfonate/Hf^IV complex coating. The coating is not produced when the Hf^IV ions are absent or when naphthalene monosulfonate replaces naphthalene trisulfonate; this indicat

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.