https://scholar.dgist.ac.kr/handle/20.500.11750/1928 Wed, 11 Nov 2026 11:08:54 GMT 2026-11-11T11:08:54Z https://scholar.dgist.ac.kr/handle/20.500.11750/61147 Title: Immobilized microalgae-driven triboelectric nanogenerators for sustainable bioelectricity production Author(s): Kaja, Kushal Ruthvik; Janpum, Chalampol; Komkhum, Tanakit; Hajra, Sugato; Vivekananthan, Venkateswaran; Vittayakorn, Naratip; Thinsurat, Kamon; Ngamcharussrivichai, Chawalit; Kim, Hoe Joon; In-na, Pichaya Abstract: Triboelectric nanogenerators (TENG) are emerging as promising solutions for decentralised energy generation due to the growing need for sustainable power sources. These devices convert wasted mechanical energy into electricity under ambient conditions, offering advantages such as eco-friendly operation, material versatility, and effective energy scavenging. Despite these benefits, their relatively low electrical output compared to conventional sources like batteries and fuel cells remains a limitation. Microalgae have attracted attention for their ability to produce bioelectricity through photosynthesis and respiration while simultaneously capturing carbon dioxide. Immobilising microalgal cells on conductive substrates improves electron transfer and metabolic activity. In this context, living Chlorella vulgaris TISTR 8580 with varied cell densities was immobilised on aluminium electrodes and incorporated into a TENG platform to explore energy harvesting from solid-solid and solid-liquid interactions. The highest output of 110V and 330 nA was generated, confirming the microalgae as a promising tribolayer and extending the conventional triboelectric series. However, sustaining cell viability over extended periods remains a challenge, highlighting the need for optimised light and nutrient conditions in future developments. Mon, 30 Nov 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/61147 2026-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/61142 Title: Dynamic-junction triboelectric nanogenerators: Underlying physics, interface charge-generation mechanisms, and design frameworks for enhanced harvesting and sensing performance Author(s): Sriphan, Saichon; Vittayakorn, Wanwilai; Maluangnont, Tosapol; Hajra, Sugato; Kim, Hoe Joon; Pakawanit, Phakkhananan; Charoonsuk, Thitirat; Vittayakorn, Naratip Abstract: The increasing demand for sustainable energy solutions has driven the advancement of technologies capable of converting ambient mechanical energy into electrical power. Among these, triboelectric nanogenerators (TENGs) have emerged as a prominent platform for broad-based energy harvesting. This review provides an overview of recent developments in dynamic junction-based TENGs, highlighting approaches that extend beyond conventional solid-solid (S-S) contact-separation mechanisms to encompass charge generation at liquid-solid (L-S), liquid-liquid (L-L), and liquid-gas (L-G) interfaces. Dynamic-junction TENGs are defined as triboelectric systems in which mechanically evolving interfaces regulate charge generation, separation, or collection. Under this framework, dynamic junctions encompass both material interfaces—such as S–S, L–S, L–L, L–G, and G–S—and electronically active semiconductor junctions, including Schottky, p–n, and heterojunction-based tribovoltaic nanogenerators. We provide a comparative analysis of the fundamental working principles of TENGs and the distinct charge generation mechanisms intrinsic to each interface type. The review discusses the theoretical frameworks relevant to dynamic-junction TENGs according to their domains of applicability, including the capacitive model and Maxwell’s displacement current for electrostatic-induction-based devices, Wang’s electron-cloud model for microscopic solid–solid contact electrification, and electric-double-layer-based models for liquid-containing interfaces. Furthermore, we categorize and scrutinize advanced design strategies, from interface-specific innovations and materials engineering to system-level integration and hybridization, all aimed at significantly enhancing output performance. The review highlights the representative applications of dynamic junction-based TENGs in diverse fields such as wearable electronics, environmental energy harvesting, intelligent robotics, and smart infrastructure. Finally, we discuss critical challenges, including stability, durability, and scalability, and outline future research directions, aiming to provide insights for the ongoing development and practical implementation of highly efficient, self-powered systems. Mon, 30 Nov 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/61142 2026-11-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/61117 Title: Dry Mask Transfer Lithography for High-Resolution Patterning of Nanomaterials and Molecular Interfaces on Arbitrary Substrates Author(s): 김나윤; Park, Kyeong Jun; Kim, Junhyung; Kim, Seok; Yu, Jaehyung; Kim, Hoe Joon; Keum, Hohyun Abstract: This study introduces dry mask transfer lithography as a versatile microfabrication strategy that integrates the patterning resolution of photolithography with the substrate adaptability of soft lithography. In this method, a photoresist mask is first patterned on an elastomeric polymer stamp and subsequently transferred onto a target substrate by thermally modulating interfacial adhesion and viscoelastic energy dissipation. The process enables high-fidelity pattern formation across a wide range of surfaces including semiconductors, metals, and insulators and even on a curved surface while preventing direct exposure of the target substrate and functional materials to solution-based lithographic chemicals. Utilizing the transferred photoresist pattern as a lift-off mask, the method further enabled patterning of zero-, one-, and two-dimensional colloidal nanomaterials as well as self-assembled molecular layers. Compared with the conventional shadow masking method, the transferred masks provided approximately 6-fold higher pattern precision, with a minimum pattern-edge curvature radius of approximately 0.75 mu m. Raman and X-ray photoelectron spectroscopic analysis confirmed that the intrinsic properties of the patterned nanomaterials were preserved. As a functional demonstration, biphilic surfaces fabricated by the method showed a more than 3-fold increase in fog-harvesting efficiency compared with uniform hydrophobic surfaces owing to controlled droplet nucleation, growth, and coalescence. These findings establish dry mask transfer lithography as a broadly applicable platform for high-precision integration of chemically sensitive colloidal nanomaterials onto diverse substrates, offering strong potential for the fabrication of high-performance functional interfaces, nanodevices, displays, and energy-related systems. Wed, 30 Sep 2026 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/61117 2026-09-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/61108 Title: Semiconducting poly(3-hexylthiophene) (P3HT)-functionalized rayon for hybrid mechanical-thermal energy harvesting in fabric triboelectric nanogenerators Author(s): Sae-tang, Chanachot; Navatragulpisit, Suchanat; Plaipichit, Suwan; Sriphan, Saichon; Hajra, Sugato; Kim, Hoe Joon; Ukasi, Sirinya; Vittayakorn, Wanwilai; Charoonsuk, Thitirat; Vittayakorn, Naratip Abstract: The fabric triboelectric nanogenerator (F-TENG) is emerging as a promising nanogenerator platform for wearable electronics and electronic textiles. In this work, a modified fabric incorporating the semiconductor polymer poly (3-hexylthiophene) (P3HT) is designed to address the limited output performance by harvesting frictiongenerated waste heat in addition to mechanical energy. The P3HT is incorporated into rayon fabric via a simple coating process, enabling the fabric to function as a dual mechanical-thermal energy harvesting material. During the sliding process, temperature evolution at the interface is monitored by a thermal camera and thermal probes to correlate heat generation with output enhancement. The electrical and thermoelectric characteristics of the rayon-P3HT fabrics are evaluated in terms of electrical conductivity, Seebeck coefficient, and power factor. Multiphysics simulations performed using COMSOL are further employed to support the experimental trends. Owing to the combined triboelectric and thermoelectric contributions, the fabric-based device achieves an improved open-circuit voltage (VOC), short-circuit current (ISC), and maximum output power (Pmax) of ~62 V, ~44 μA and ~ 1204 μW (~133.8 μW/cm2 ), respectively, sufficient to power a digital watch and 360 LEDs. The role of fabric modification by P3HT in enabling triboelectric-thermoelectric coupling and the associated charge generation mechanism is discussed. Wed, 31 Dec 2025 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/61108 2025-12-31T15:00:00Z