SeongMin Kim

A bioadhesive triboelectric nanogenerator (BA-TENG), as a first-aid rescue for instant and robust wound sealing and ultrasound-driven accelerated wound healing, is designed. This BA-TENG is fabricated with biocompatible materials, and integrates a flexible TENG as the top layer and bioadhesive as the bottom layer, resulting in effective electricity supply and strong sutureless sealing capability on wet tissues. When driven by ultrasound, the BA-TENG can produce a stable voltage of 1.50 V and cur

Abstract The development of highly tribopositive materials is crucial for realizing high‐performance triboelectric nanogenerators. In this study, a novel protocol to maximize the number of non‐bonding electrons with local dipoles for designing highly tribopositive materials is introduced, and nitrogen‐based dimethylol urea, diazolidinyl urea, and imidazolidinyl urea as promising tribopositive materials are suggested. The mechanism by which nitrogen‐based materials provide highly tribopositive pr

Ferroelectric coupling effects on the energy-band structure of hybrid heterojunctions are investigated using hybrid photovoltaic devices with poly(3-hexylthiophene-2,5-diyl) (P3HT)/ZnO and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)). The self-organized P(VDF-TrFE):P3HT photoactive layer forms a novel architecture consisting of P3HT domains in a P(VDF-TrFE) matrix. The energy-band structure at the interface of the p-n heterojunction is tuned by artificial control of the ferroelectri

In this paper, we present a theoretical approach to calculate transferred charges in a triboelectric nanogenerator (TENG) by embedding triboelectric materials with different dielectric constants. The influence of the effective dielectric constant and work function (as a function of dielectric constant) of the composite material is discussed numerically. Two cases are considered separately: averaged surface density of states and . As a result, structural parameters, including both separation dist

Airborne pathogens retain prolonged infectious activity once attached to the indoor environment, posing a pervasive threat to public health. Conventional air filters suffer from ineffective inactivation of the physics-separated microorganisms, and the chemical-based antimicrobial materials face challenges of poor stability/efficiency and inefficient viral inactivation. We, therefore, developed a rapid, reliable antimicrobial method against the attached indoor bacteria/viruses using a large-scale

First-principles calculations of the piezoresponses ( e 33 ) of PbZr x Ti 1- x O 3 (PZT) with various crystalline phases and Zr/Ti ratios (composition: B-site cations) are performed at room temperature using density-functional perturbation theory (DFPT) to understand the experimental observation that large piezoresponses occur at the morphotropic phase boundary (MPB). The results of ab initio calculations indicate that PZT (Zr/Ti = 52/48) with a tetragonal (P4MM) phase shows the lowest formation

The structural shape of the interface between a metal and dielectric material in a triboelectric nanogenerator (TENG) is an important factor that can improve the device performance. Many interfacial structures have been developed to improve the TENG performance. However, there have been very few studies on the numerical interpretation of various types of contact interfaces. For various interfacial structures on which uniform triboelectric charge density is distributed, the surface charge density

Abstract With the development of wearable and wireless electronic devices, the triboelectric nanogenerator (TENG) is attracting interest as a candidate for portable power. Many studies are conducted to increase the surface charge density of the TENG, such as external charge pumping or external electron excitation strategies. However, there are limitations in that another additional external energy source is required. Here, a TENG–capacitor (TC) coupling system that can maximize energy generation

An analytical and numerical analysis on contact-mode triboelectric nanogenerators (TENGs) was carried out in this work. Based on the analytical model, the time-dependent transferred charge and the relationship between the transferred charge and accelerated velocity were numerically analyzed. The approach used here is the general interpretation of the contact-mode TENG for the time-dependent transferred charge, which can be used as a guidance for a practical design of the TENG system.