https://scholar.dgist.ac.kr/handle/20.500.11750/9972 Tue, 27 Oct 2026 07:52:42 GMT 2026-10-27T07:52:42Z https://scholar.dgist.ac.kr/handle/20.500.11750/60960 Title: Progress in PDMS modification strategies for high-performance triboelectric nanogenerators: design, applications and future perspective Author(s): Inbaraj, Davis Jacob; Gwak, Sujeong; Lee, Ju-Hyuck; Shin, Dong-Wook Abstract: Eco- and bio-friendly polydimethylsiloxane (PDMS) material-based triboelectric nanogenerators (TENGs) have attracted significant attention for applications in energy harvesting, sensing, and self-powered systems. The performance of PDMS-based TENGs is highly dependent on rational material selection and structural engineering within the PDMS matrix. While conventional components such as dielectrics, metals, two-dimensional (2D) materials, and carbon-based fillers have been widely used, there is a growing demand for advanced materials to enhance efficiency and broaden the scope of applications. In this context, a variety of fillers have been explored in PDMS-based TENGs owing to their favorable properties, including biocompatibility, high sensitivity, nontoxicity, and superior electron mobility. These features make them particularly suitable for next-generation energy harvesting technologies. Unlike previous reviews, this work provides an in-depth and systematic overview of PDMS-based TENGs incorporating diverse fillers, with a focus on their impact on triboelectric performance and practical applications. It highlights the influence of these fillers on output efficiency and expands on their use in areas such as energy harvesting, self-powered sensing, human-machine interaction, and wearable devices. The review concludes by outlining current challenges, emphasizing the need for further research, and offering perspectives to guide future developments in this rapidly advancing field. Fri, 31 Jul 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60960 2026-07-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60902 Title: Large-area kinetic stabilization of metastable R-glycine via meniscus-driven self-assembly with anisotropic piezoelectricity Author(s): Ryu, Yeonkyeong; Lee, Cheoljae; Zhao, Pin; Yeon, Jimin; Choi, Jinsung; Ibrahim, Tijani Okanlawon; Gwak, Sujeong; Gbadam, Gerald Selasie; Moon, Yeongheum; Shin, Dong-Myeong; Lee, Ju Hun; Lee, Ju-Hyuck Abstract: The development of natural piezoelectric biomaterials with tunable structure and functionality is crucial for advancing sustainable and biocompatible technologies in energy harvesting, implantable electronics, and biomedical systems. Glycine, the simplest amino acid classified into alpha, R, and gamma polymorphs, exhibits inherent substantial piezoelectricity at the R-phase structure. However, achieving controllable and scalable R-phase formation remains a key challenge due to its thermodynamic instability. Here, we present a scalable meniscus-guided self-assembly strategy for the large-area fabrication of uniform R-glycine crystals. Precise balancing of solvent evaporation and crystal growth kinetics enables direct crystallization and selective stabilization of the R-phase. This approach further induces pronounced crystallographic alignment, producing highly oriented R-glycine domains. The non-centrosymmetric structure and electromechanical functionality of the aligned crystals are verified by piezoresponse force microscopy (PFM) and second harmonic generation (SHG) analysis. The resulting assemblies demonstrate piezoelectric energy harvesting capability, confirming the potential of R-glycine as a functional piezoelectric material. This work offers a promising step toward enhancing the piezoelectric performance of natural biomaterials with potential implications for future self-powered biomedical applications. Tue, 30 Jun 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60902 2026-06-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60423 Title: Skin-Integrated Wearable Electronics: A Dual-Interface Perspective Author(s): Dong, Fuying; Han, Chi; Cai, Sheling T.; Lee, Ju-Hyuck; Niu, Simiao Abstract: Skin-integrated wearable electronics enable continuous, medical-grade monitoring and therapy in daily life, but must balance conflicting needs related to mechanics, power, and communication. This review uses a dual-interface approach that separates the sensor–receiver interface, which handles wireless data and energy transfer, from the sensor–skin interface, where physiological signals are converted and mechanical and biological integration occur. We first reviewed wireless connections designed for skin electronics, focusing on Bluetooth Low Energy (BLE), Radio Frequency Identification (RFID)/Near-Field Communication (NFC) systems, and hybrid systems. Next, we examine sensor–skin interfaces ranging from mediated contact layers such as hydrogels for wearable ultrasound and soft conductive electrodes, to skin-conformal direct-contact methods based on structural mechanics, and ultrathin epidermal devices. Finally, we discuss cross-interface coupling, emphasizing how antenna layouts, power budgets, and body-induced RF effects limit mechanical design, and how skin mechanics influence link reliability. We conclude by exploring opportunities in battery-free and energy-autonomous systems, body-coupled communication, and integration with artificial intelligence (AI)-enabled digital health, positioning future electronic skins as soft, networked platforms that are comfortable and reliable. © 2026 The Author(s). SmartSys published by John Wiley & Sons Australia, Ltd on behalf of Youke Publishing Co., Ltd. Sun, 30 Nov 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/60423 2025-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59987 Title: Dielectric Polarization-Driven Energy Amplification in 2D Nanostructure-Embedded PVC Gel TENGs for Tribo-Resistive Sensing Applications Author(s): Park, Hyosik; Gbadam, Gerald Selasie; Lee, Cheoljae; Joo, Hyeonseo; Gwak, Sujeong; Rojas, Orlando J.; Lee, Ju-hyuck Abstract: Plasticized poly(vinyl chloride) (PVC) gels are prototypical soft ionic polymers that combine strongly negative charge polarity with inherently high permittivity; however, their mobile ions impose substantial dielectric loss and leakage currents, which limit the output of triboelectric nanogenerators (TENGs). Here, graphene oxide (GO) nanosheets are embedded as 2D capacitive layers in a PVC gel, where they immobilize excess ions and add interfacial polarization, giving a dielectric constant of 32 at 1 kHz while lowering the dissipation factor (tan delta) by 65% relative to the pristine gel. The optimized GO-doped gel TENG delivers 282 V, 20.1 mu A, and 612 mu W/cm2-approximately 2.3, 2.0, and 2.5 times the values of the pristine PVC gel, respectively. A single GO-PVC gel layer simultaneously functions as both dielectric and electrode, powering a self-powered tribo-resistive sensor that pinpoints pressures up to 800 kPa over a 5 x 5 virtual grid, with a spatial resolution of approximate to 1.8 mm and pressure sensitivities of 194 mV/kPa (0-200 kPa) and 25 mV/kPa (200-800 kPa). By suppressing ion-driven loss while amplifying polarization, this 2D capacitive-layer strategy is transferable to other ionic-gel systems-including ionic-liquid gels and ionomers-charting a versatile route toward high-output soft TENGs for energy-autonomous wearables and electronic skin. Sat, 31 Jan 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/59987 2026-01-31T15:00:00Z